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mutter/cogl/cogl-material.c
Robert Bragg de1f4885dd material: Avoid possibly reading invalid memory 
in _cogl_material_prune_empty_layer_difference we sometimes unref the
given layer before dereferencing it to get a pointer to its parent. This
defers the unref until after we have fetched the parent pointer.
2010-06-24 17:05:26 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2008,2009,2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-material-private.h"
#include "cogl-texture-private.h"
#include "cogl-blend-string.h"
#include "cogl-journal-private.h"
#include "cogl-color-private.h"
#include "cogl-profile.h"
#ifndef HAVE_COGL_GLES
#include "cogl-program.h"
#endif
#include <glib.h>
#include <glib/gprintf.h>
#include <string.h>
/*
* GL/GLES compatability defines for material thingies:
*/
#ifdef HAVE_COGL_GLES2
#include "../gles/cogl-gles2-wrapper.h"
#endif
#ifdef HAVE_COGL_GL
#define glActiveTexture ctx->drv.pf_glActiveTexture
#define glClientActiveTexture ctx->drv.pf_glClientActiveTexture
#define glBlendFuncSeparate ctx->drv.pf_glBlendFuncSeparate
#define glBlendEquation ctx->drv.pf_glBlendEquation
#define glBlendColor ctx->drv.pf_glBlendColor
#define glBlendEquationSeparate ctx->drv.pf_glBlendEquationSeparate
#define glProgramString ctx->drv.pf_glProgramString
#define glBindProgram ctx->drv.pf_glBindProgram
#define glDeletePrograms ctx->drv.pf_glDeletePrograms
#define glGenPrograms ctx->drv.pf_glGenPrograms
#define glProgramLocalParameter4fv ctx->drv.pf_glProgramLocalParameter4fv
#define glUseProgram ctx->drv.pf_glUseProgram
#endif
/* This isn't defined in the GLES headers */
#ifndef GL_CLAMP_TO_BORDER
#define GL_CLAMP_TO_BORDER 0x812d
#endif
#define COGL_MATERIAL(X) ((CoglMaterial *)(X))
#define COGL_MATERIAL_LAYER(X) ((CoglMaterialLayer *)(X))
typedef struct _CoglMaterialBackendARBfpPrivate
{
CoglMaterial *authority_cache;
unsigned long authority_cache_age;
GString *source;
GLuint gl_program;
gboolean *sampled;
int next_constant_id;
} CoglMaterialBackendARBfpPrivate;
typedef gboolean (*CoglMaterialStateComparitor) (CoglMaterial *authority0,
CoglMaterial *authority1);
static CoglMaterialLayer *_cogl_material_layer_copy (CoglMaterialLayer *layer);
static void _cogl_material_free (CoglMaterial *tex);
static void _cogl_material_layer_free (CoglMaterialLayer *layer);
static void _cogl_material_add_layer_difference (CoglMaterial *material,
CoglMaterialLayer *layer,
gboolean inc_n_layers);
static void handle_automatic_blend_enable (CoglMaterial *material,
CoglMaterialState changes);
#if defined (HAVE_COGL_GL)
static const CoglMaterialBackend _cogl_material_glsl_backend;
static const CoglMaterialBackend _cogl_material_arbfp_backend;
static const CoglMaterialBackend _cogl_material_fixed_backend;
static const CoglMaterialBackend *backends[] =
{
/* The fragment processing backends in order of precedence... */
&_cogl_material_glsl_backend,
&_cogl_material_arbfp_backend,
&_cogl_material_fixed_backend
};
/* NB: material->backend is currently a 3bit unsigned int bitfield */
#define COGL_MATERIAL_BACKEND_GLSL 0
#define COGL_MATERIAL_BACKEND_GLSL_MASK (1L<<0)
#define COGL_MATERIAL_BACKEND_ARBFP 1
#define COGL_MATERIAL_BACKEND_ARBFP_MASK (1L<<1)
#define COGL_MATERIAL_BACKEND_FIXED 2
#define COGL_MATERIAL_BACKEND_FIXED_MASK (1L<<2)
#elif defined (HAVE_COGL_GLES2)
static const CoglMaterialBackend _cogl_material_glsl_backend;
static const CoglMaterialBackend _cogl_material_fixed_backend;
static const CoglMaterialBackend *backends[] =
{
/* The fragment processing backends in order of precedence... */
&_cogl_material_glsl_backend,
&_cogl_material_fixed_backend
};
#define COGL_MATERIAL_BACKEND_GLSL 0
#define COGL_MATERIAL_BACKEND_FIXED 1
#else /* HAVE_COGL_GLES */
static const CoglMaterialBackend _cogl_material_fixed_backend;
static const CoglMaterialBackend *backends[] =
{
/* The fragment processing backends in order of precedence... */
&_cogl_material_fixed_backend
};
#define COGL_MATERIAL_BACKEND_FIXED 0
#endif
#define COGL_MATERIAL_BACKEND_DEFAULT 0
#define COGL_MATERIAL_BACKEND_UNDEFINED 3
COGL_HANDLE_DEFINE (Material, material);
COGL_HANDLE_DEFINE (MaterialLayer, material_layer);
static void
texture_unit_init (CoglTextureUnit *unit, int index_)
{
unit->index = index_;
unit->enabled = FALSE;
unit->current_gl_target = 0;
unit->gl_texture = 0;
unit->is_foreign = FALSE;
unit->dirty_gl_texture = FALSE;
unit->matrix_stack = _cogl_matrix_stack_new ();
unit->layer = NULL;
unit->layer_changes_since_flush = 0;
unit->texture_storage_changed = FALSE;
}
static void
texture_unit_free (CoglTextureUnit *unit)
{
if (unit->layer)
cogl_handle_unref (unit->layer);
_cogl_matrix_stack_destroy (unit->matrix_stack);
}
CoglTextureUnit *
_cogl_get_texture_unit (int index_)
{
_COGL_GET_CONTEXT (ctx, NULL);
if (ctx->texture_units->len < (index_ + 1))
{
int i;
int prev_len = ctx->texture_units->len;
ctx->texture_units = g_array_set_size (ctx->texture_units, index_ + 1);
for (i = prev_len; i <= index_; i++)
{
CoglTextureUnit *unit =
&g_array_index (ctx->texture_units, CoglTextureUnit, i);
texture_unit_init (unit, i);
}
}
return &g_array_index (ctx->texture_units, CoglTextureUnit, index_);
}
void
_cogl_destroy_texture_units (void)
{
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
for (i = 0; i < ctx->texture_units->len; i++)
{
CoglTextureUnit *unit =
&g_array_index (ctx->texture_units, CoglTextureUnit, i);
texture_unit_free (unit);
}
g_array_free (ctx->texture_units, TRUE);
}
static void
set_active_texture_unit (int unit_index)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->active_texture_unit != unit_index)
{
GE (glActiveTexture (GL_TEXTURE0 + unit_index));
ctx->active_texture_unit = unit_index;
}
}
/* Note: _cogl_bind_gl_texture_transient conceptually has slightly
* different semantics to OpenGL's glBindTexture because Cogl never
* cares about tracking multiple textures bound to different targets
* on the same texture unit.
*
* glBindTexture lets you bind multiple textures to a single texture
* unit if they are bound to different targets. So it does something
* like:
* unit->current_texture[target] = texture;
*
* Cogl only lets you associate one texture with the currently active
* texture unit, so the target is basically a redundant parameter
* that's implicitly set on that texture.
*
* Technically this is just a thin wrapper around glBindTexture so
* actually it does have the GL semantics but it seems worth
* mentioning the conceptual difference in case anyone wonders why we
* don't associate the gl_texture with a gl_target in the
* CoglTextureUnit.
*/
void
_cogl_bind_gl_texture_transient (GLenum gl_target,
GLuint gl_texture,
gboolean is_foreign)
{
CoglTextureUnit *unit;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* We choose to always make texture unit 1 active for transient
* binds so that in the common case where multitexturing isn't used
* we can simply ignore the state of this texture unit. Notably we
* didn't use a large texture unit (.e.g. (GL_MAX_TEXTURE_UNITS - 1)
* in case the driver doesn't have a sparse data structure for
* texture units.
*/
set_active_texture_unit (1);
unit = _cogl_get_texture_unit (1);
/* NB: If we have previously bound a foreign texture to this texture
* unit we don't know if that texture has since been deleted and we
* are seeing the texture name recycled */
if (unit->gl_texture == gl_texture &&
!unit->dirty_gl_texture &&
!unit->is_foreign)
return;
GE (glBindTexture (gl_target, gl_texture));
unit->dirty_gl_texture = TRUE;
unit->is_foreign = is_foreign;
}
void
_cogl_delete_gl_texture (GLuint gl_texture)
{
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
for (i = 0; i < ctx->texture_units->len; i++)
{
CoglTextureUnit *unit =
&g_array_index (ctx->texture_units, CoglTextureUnit, i);
if (unit->gl_texture == gl_texture)
{
unit->gl_texture = 0;
unit->dirty_gl_texture = FALSE;
}
}
GE (glDeleteTextures (1, &gl_texture));
}
/* Whenever the underlying GL texture storage of a CoglTexture is
* changed (e.g. due to migration out of a texture atlas) then we are
* notified. This lets us ensure that we reflush that texture's state
* if it reused again with the same texture unit.
*/
void
_cogl_material_texture_storage_change_notify (CoglHandle texture)
{
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
for (i = 0; i < ctx->texture_units->len; i++)
{
CoglTextureUnit *unit =
&g_array_index (ctx->texture_units, CoglTextureUnit, i);
if (unit->layer &&
unit->layer->texture == texture)
unit->texture_storage_changed = TRUE;
/* NB: the texture may be bound to multiple texture units so
* we continue to check the rest */
}
}
GQuark
_cogl_material_error_quark (void)
{
return g_quark_from_static_string ("cogl-material-error-quark");
}
/*
* This initializes the first material owned by the Cogl context. All
* subsequently instantiated materials created via the cogl_material_new()
* API will initially be a copy of this material.
*
* The default material is the topmost ancester for all materials.
*/
void
_cogl_material_init_default_material (void)
{
/* Create new - blank - material */
CoglMaterial *material = g_slice_new0 (CoglMaterial);
CoglMaterialBigState *big_state = g_slice_new0 (CoglMaterialBigState);
CoglMaterialLightingState *lighting_state = &big_state->lighting_state;
CoglMaterialAlphaFuncState *alpha_state = &big_state->alpha_state;
CoglMaterialBlendState *blend_state = &big_state->blend_state;
CoglMaterialDepthState *depth_state = &big_state->depth_state;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
material->is_weak = FALSE;
material->journal_ref_count = 0;
material->parent = NULL;
material->backend = COGL_MATERIAL_BACKEND_UNDEFINED;
material->differences = COGL_MATERIAL_STATE_ALL_SPARSE;
material->real_blend_enable = FALSE;
material->blend_enable = COGL_MATERIAL_BLEND_ENABLE_AUTOMATIC;
material->layer_differences = NULL;
material->n_layers = 0;
material->big_state = big_state;
material->has_big_state = TRUE;
material->static_breadcrumb = "default material";
material->has_static_breadcrumb = TRUE;
material->age = 0;
/* Use the same defaults as the GL spec... */
cogl_color_init_from_4ub (&material->color, 0xff, 0xff, 0xff, 0xff);
/* Use the same defaults as the GL spec... */
lighting_state->ambient[0] = 0.2;
lighting_state->ambient[1] = 0.2;
lighting_state->ambient[2] = 0.2;
lighting_state->ambient[3] = 1.0;
lighting_state->diffuse[0] = 0.8;
lighting_state->diffuse[1] = 0.8;
lighting_state->diffuse[2] = 0.8;
lighting_state->diffuse[3] = 1.0;
lighting_state->specular[0] = 0;
lighting_state->specular[1] = 0;
lighting_state->specular[2] = 0;
lighting_state->specular[3] = 1.0;
lighting_state->emission[0] = 0;
lighting_state->emission[1] = 0;
lighting_state->emission[2] = 0;
lighting_state->emission[3] = 1.0;
/* Use the same defaults as the GL spec... */
alpha_state->alpha_func = COGL_MATERIAL_ALPHA_FUNC_ALWAYS;
alpha_state->alpha_func_reference = 0.0;
/* Not the same as the GL default, but seems saner... */
#ifndef HAVE_COGL_GLES
blend_state->blend_equation_rgb = GL_FUNC_ADD;
blend_state->blend_equation_alpha = GL_FUNC_ADD;
blend_state->blend_src_factor_alpha = GL_ONE;
blend_state->blend_dst_factor_alpha = GL_ONE_MINUS_SRC_ALPHA;
cogl_color_init_from_4ub (&blend_state->blend_constant,
0x00, 0x00, 0x00, 0x00);
#endif
blend_state->blend_src_factor_rgb = GL_ONE;
blend_state->blend_dst_factor_rgb = GL_ONE_MINUS_SRC_ALPHA;
big_state->user_program = COGL_INVALID_HANDLE;
/* The same as the GL defaults */
depth_state->depth_test_enabled = FALSE;
depth_state->depth_test_function = COGL_DEPTH_TEST_FUNCTION_LESS;
depth_state->depth_writing_enabled = TRUE;
depth_state->depth_range_near = 0;
depth_state->depth_range_far = 1;
ctx->default_material = _cogl_material_handle_new (material);
}
static void
_cogl_material_unparent (CoglMaterial *material)
{
CoglMaterial *parent = material->parent;
if (parent == NULL)
return;
g_return_if_fail (parent->has_children);
if (parent->first_child == material)
{
if (parent->children)
{
parent->first_child = parent->children->data;
parent->children =
g_list_delete_link (parent->children, parent->children);
}
else
parent->has_children = FALSE;
}
else
parent->children = g_list_remove (parent->children, material);
cogl_handle_unref (parent);
material->parent = NULL;
}
/* This recursively frees the layers_cache of a material and all of
* its descendants.
*
* For instance if we change a materials ->layer_differences list
* then that material and all of its descendants may now have
* incorrect layer caches. */
static void
recursively_free_layer_caches (CoglMaterial *material)
{
GList *l;
/* Note: we maintain the invariable that if a material already has a
* dirty layers_cache then so do all of its descendants. */
if (material->layers_cache_dirty)
return;
if (G_UNLIKELY (material->layers_cache != material->short_layers_cache))
g_slice_free1 (sizeof (CoglMaterialLayer *) * material->n_layers,
material->layers_cache);
material->layers_cache_dirty = TRUE;
if (material->has_children)
{
recursively_free_layer_caches (material->first_child);
for (l = material->children; l; l = l->next)
recursively_free_layer_caches (l->data);
}
}
static void
_cogl_material_set_parent (CoglMaterial *material, CoglMaterial *parent)
{
cogl_handle_ref (parent);
if (material->parent)
_cogl_material_unparent (material);
material->parent = parent;
if (G_UNLIKELY (parent->has_children))
parent->children = g_list_prepend (parent->children, material);
else
{
parent->has_children = TRUE;
parent->first_child = material;
parent->children = NULL;
}
material->parent = parent;
/* Since we just changed the ancestry of the material its cache of
* layers could now be invalid so free it... */
if (material->differences & COGL_MATERIAL_STATE_LAYERS)
recursively_free_layer_caches (material);
/* If the fragment processing backend is also caching state along
* with the material that depends on the materials ancestry then it
* may be notified here...
*/
if (material->backend != COGL_MATERIAL_BACKEND_UNDEFINED &&
backends[material->backend]->material_set_parent_notify)
backends[material->backend]->material_set_parent_notify (material);
}
/* XXX: Always have an eye out for opportunities to lower the cost of
* cogl_material_copy. */
CoglHandle
cogl_material_copy (CoglHandle handle)
{
CoglMaterial *src = COGL_MATERIAL (handle);
CoglMaterial *material = g_slice_new (CoglMaterial);
cogl_handle_ref (handle);
material->_parent = src->_parent;
material->is_weak = FALSE;
material->journal_ref_count = 0;
material->parent = NULL;
material->has_children = FALSE;
material->differences = 0;
material->has_big_state = FALSE;
/* NB: real_blend_enable isn't a sparse property, it's valid for
* every material node so we have fast access to it. */
material->real_blend_enable = src->real_blend_enable;
/* XXX:
* consider generalizing the idea of "cached" properties. These
* would still have an authority like other sparse properties but
* you wouldn't have to walk up the ancestry to find the authority
* because the value would be cached directly in each material.
*/
material->layers_cache_dirty = TRUE;
material->deprecated_get_layers_list_dirty = TRUE;
material->backend = src->backend;
material->backend_priv_set_mask = 0;
material->has_static_breadcrumb = FALSE;
material->age = 0;
_cogl_material_set_parent (material, src);
return _cogl_material_handle_new (material);
}
/* XXX: we should give this more thought before making anything like
* this API public! */
CoglHandle
_cogl_material_weak_copy (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglHandle copy;
CoglMaterial *copy_material;
/* If we make a public API we might want want to allow weak copies
* of weak material? */
g_return_val_if_fail (!material->is_weak, COGL_INVALID_HANDLE);
copy = cogl_material_copy (handle);
copy_material = COGL_MATERIAL (copy);
copy_material->is_weak = TRUE;
return copy;
}
CoglHandle
cogl_material_new (void)
{
CoglHandle new;
_COGL_GET_CONTEXT (ctx, COGL_INVALID_HANDLE);
new = cogl_material_copy (ctx->default_material);
_cogl_material_set_static_breadcrumb (new, "new");
return new;
}
static void
_cogl_material_backend_free_priv (CoglMaterial *material)
{
if (material->backend != COGL_MATERIAL_BACKEND_UNDEFINED &&
backends[material->backend]->free_priv)
backends[material->backend]->free_priv (material);
}
static void
_cogl_material_free (CoglMaterial *material)
{
_cogl_material_backend_free_priv (material);
_cogl_material_unparent (material);
if (material->differences & COGL_MATERIAL_STATE_USER_SHADER &&
material->big_state->user_program)
cogl_handle_unref (material->big_state->user_program);
if (material->differences & COGL_MATERIAL_STATE_NEEDS_BIG_STATE)
g_slice_free (CoglMaterialBigState, material->big_state);
if (material->differences & COGL_MATERIAL_STATE_LAYERS)
{
g_list_foreach (material->layer_differences,
(GFunc)cogl_handle_unref, NULL);
g_list_free (material->layer_differences);
}
g_slice_free (CoglMaterial, material);
}
gboolean
_cogl_material_get_real_blend_enabled (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
g_return_val_if_fail (cogl_is_material (handle), FALSE);
return material->real_blend_enable;
}
static CoglMaterial *
_cogl_material_get_authority (CoglMaterial *material,
unsigned long difference)
{
CoglMaterial *authority = material;
while (!(authority->differences & difference))
authority = authority->parent;
return authority;
}
static CoglMaterialLayer *
_cogl_material_layer_get_authority (CoglMaterialLayer *layer,
unsigned long difference)
{
CoglMaterialLayer *authority = layer;
while (!(authority->differences & difference))
authority = authority->parent;
return authority;
}
static int
_cogl_material_layer_get_unit_index (CoglMaterialLayer *layer)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, COGL_MATERIAL_LAYER_STATE_UNIT);
return authority->unit_index;
}
static void
_cogl_material_update_layers_cache (CoglMaterial *material)
{
/* Note: we assume this material is a _LAYERS authority */
int n_layers;
CoglMaterial *current;
int layers_found;
if (G_LIKELY (!material->layers_cache_dirty) ||
material->n_layers == 0)
return;
material->layers_cache_dirty = FALSE;
n_layers = material->n_layers;
if (G_LIKELY (n_layers < G_N_ELEMENTS (material->short_layers_cache)))
{
material->layers_cache = material->short_layers_cache;
memset (material->layers_cache, 0,
sizeof (CoglMaterialLayer *) *
G_N_ELEMENTS (material->short_layers_cache));
}
else
{
material->layers_cache =
g_slice_alloc0 (sizeof (CoglMaterialLayer *) * n_layers);
}
/* Notes:
*
* Each material doesn't have to contain a complete list of the layers
* it depends on, some of them are indirectly referenced through the
* material's ancestors.
*
* material->layer_differences only contains a list of layers that
* have changed in relation to its parent.
*
* material->layer_differences is not maintained sorted, but it
* won't contain multiple layers corresponding to a particular
* ->unit_index.
*
* Some of the ancestor materials may reference layers with
* ->unit_index values >= n_layers so we ignore them.
*
* As we ascend through the ancestors we are searching for any
* CoglMaterialLayers corresponding to the texture ->unit_index
* values in the range [0,n_layers-1]. As soon as a pointer is found
* we ignore layers of further ancestors with the same ->unit_index
* values.
*/
layers_found = 0;
for (current = material; current->parent; current = current->parent)
{
GList *l;
if (!(current->differences & COGL_MATERIAL_STATE_LAYERS))
continue;
for (l = current->layer_differences; l; l = l->next)
{
CoglMaterialLayer *layer = l->data;
int unit_index = _cogl_material_layer_get_unit_index (layer);
if (unit_index < n_layers && !material->layers_cache[unit_index])
{
material->layers_cache[unit_index] = layer;
layers_found++;
if (layers_found == n_layers)
return;
}
}
}
g_warn_if_reached ();
}
typedef gboolean (*CoglMaterialLayerCallback) (CoglMaterialLayer *layer,
void *user_data);
/* TODO: add public cogl_material_foreach_layer but instead of passing
* a CoglMaterialLayer pointer to the callback we should pass a
* layer_index instead. */
static void
_cogl_material_foreach_layer (CoglHandle handle,
CoglMaterialLayerCallback callback,
void *user_data)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LAYERS);
int n_layers;
int i;
gboolean cont;
n_layers = authority->n_layers;
if (n_layers == 0)
return;
_cogl_material_update_layers_cache (authority);
for (i = 0, cont = TRUE; i < n_layers && cont == TRUE; i++)
cont = callback (authority->layers_cache[i], user_data);
}
static gboolean
layer_has_alpha_cb (CoglMaterialLayer *layer, void *data)
{
CoglMaterialLayer *combine_authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_COMBINE);
CoglMaterialLayerBigState *big_state = combine_authority->big_state;
CoglMaterialLayer *tex_authority;
gboolean *has_alpha = data;
/* has_alpha maintains the alpha status for the GL_PREVIOUS layer */
/* For anything but the default texture combine we currently just
* assume it may result in an alpha value < 1
*
* FIXME: we could do better than this. */
if (big_state->texture_combine_alpha_func != GL_MODULATE ||
big_state->texture_combine_alpha_src[0] != GL_PREVIOUS ||
big_state->texture_combine_alpha_op[0] != GL_SRC_ALPHA ||
big_state->texture_combine_alpha_src[0] != GL_TEXTURE ||
big_state->texture_combine_alpha_op[0] != GL_SRC_ALPHA)
{
*has_alpha = TRUE;
/* return FALSE to stop iterating layers... */
return FALSE;
}
/* NB: A layer may have a combine mode set on it but not yet
* have an associated texture which would mean we'd fallback
* to the default texture which doesn't have an alpha component
*/
tex_authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_TEXTURE);
if (tex_authority->texture &&
cogl_texture_get_format (tex_authority->texture) & COGL_A_BIT)
{
*has_alpha = TRUE;
/* return FALSE to stop iterating layers... */
return FALSE;
}
*has_alpha = FALSE;
/* return FALSE to continue iterating layers... */
return TRUE;
}
static CoglHandle
_cogl_material_get_user_program (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), COGL_INVALID_HANDLE);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_USER_SHADER);
return authority->big_state->user_program;
}
static gboolean
_cogl_material_needs_blending_enabled (CoglMaterial *material,
unsigned long changes,
const CoglColor *override_color)
{
CoglMaterial *enable_authority;
CoglMaterial *blend_authority;
CoglMaterialBlendState *blend_state;
CoglMaterialBlendEnable enabled;
unsigned long other_state;
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_BLENDING))
return FALSE;
enable_authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_BLEND_ENABLE);
enabled = enable_authority->blend_enable;
if (enabled != COGL_MATERIAL_BLEND_ENABLE_AUTOMATIC)
return enabled == COGL_MATERIAL_BLEND_ENABLE_ENABLED ? TRUE : FALSE;
blend_authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_BLEND);
blend_state = &blend_authority->big_state->blend_state;
/* We are trying to identify awkward cases that are equivalent to
* blending being disable, where the output is simply GL_SRC_COLOR.
*
* Note: we assume that all OpenGL drivers will identify the simple
* case of ADD (ONE, ZERO) as equivalent to blending being disabled.
*
* We should update this when we add support for more blend
* functions...
*/
#ifndef HAVE_COGL_GLES
/* GLES 1 can't change the function or have separate alpha factors */
if (blend_state->blend_equation_rgb != GL_FUNC_ADD ||
blend_state->blend_equation_alpha != GL_FUNC_ADD)
return TRUE;
if (blend_state->blend_src_factor_alpha != GL_ONE ||
blend_state->blend_dst_factor_alpha != GL_ONE_MINUS_SRC_ALPHA)
return TRUE;
#endif
if (blend_state->blend_src_factor_rgb != GL_ONE ||
blend_state->blend_dst_factor_rgb != GL_ONE_MINUS_SRC_ALPHA)
return TRUE;
/* Given the above constraints, it's now a case of finding any
* SRC_ALPHA that != 1 */
/* In the case of a layer state change we need to check everything
* else first since they contribute to the has_alpha status of the
* GL_PREVIOUS layer. */
if (changes & COGL_MATERIAL_STATE_LAYERS)
changes = COGL_MATERIAL_STATE_AFFECTS_BLENDING;
/* XXX: we don't currently handle specific changes in an optimal way*/
changes = COGL_MATERIAL_STATE_AFFECTS_BLENDING;
if ((override_color && cogl_color_get_alpha_byte (override_color) != 0xff))
return TRUE;
if (changes & COGL_MATERIAL_STATE_COLOR)
{
CoglColor tmp;
cogl_material_get_color (material, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE;
}
/* We can't make any assumptions about the alpha channel if the user
* is using an unknown fragment shader.
*
* TODO: check that it isn't just a vertex shader!
*/
if (changes & COGL_MATERIAL_STATE_USER_SHADER)
{
if (_cogl_material_get_user_program (material) != COGL_INVALID_HANDLE)
return TRUE;
}
/* XXX: we should only need to look at these if lighting is enabled
*/
if (changes & COGL_MATERIAL_STATE_LIGHTING)
{
CoglColor tmp;
cogl_material_get_ambient (material, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE;
cogl_material_get_diffuse (material, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE;
cogl_material_get_specular (material, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE;
cogl_material_get_emission (material, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE;
}
if (changes & COGL_MATERIAL_STATE_LAYERS)
{
/* has_alpha tracks the alpha status of the GL_PREVIOUS layer.
* To start with that's defined by the material color which
* must be fully opaque if we got this far. */
gboolean has_alpha = FALSE;
_cogl_material_foreach_layer (material,
layer_has_alpha_cb,
&has_alpha);
if (has_alpha)
return TRUE;
}
/* So far we have only checked the property that has been changed so
* we now need to check all the other properties too. */
other_state = COGL_MATERIAL_STATE_AFFECTS_BLENDING & ~changes;
if (other_state &&
_cogl_material_needs_blending_enabled (material,
other_state,
NULL))
return TRUE;
return FALSE;
}
static void
_cogl_material_set_backend (CoglMaterial *material, int backend)
{
_cogl_material_backend_free_priv (material);
material->backend = backend;
}
static void
_cogl_material_copy_differences (CoglMaterial *dest,
CoglMaterial *src,
unsigned long differences)
{
CoglMaterialBigState *big_state;
if (differences & COGL_MATERIAL_STATE_COLOR)
dest->color = src->color;
if (differences & COGL_MATERIAL_STATE_BLEND_ENABLE)
dest->blend_enable = src->blend_enable;
if (differences & COGL_MATERIAL_STATE_LAYERS)
{
GList *l;
if (dest->differences & COGL_MATERIAL_STATE_LAYERS &&
dest->layer_differences)
{
g_list_foreach (dest->layer_differences,
(GFunc)cogl_handle_unref,
NULL);
g_list_free (dest->layer_differences);
}
dest->n_layers = src->n_layers;
dest->layer_differences = g_list_copy (src->layer_differences);
for (l = src->layer_differences; l; l = l->next)
{
/* NB: a layer can't have more than one ->owner so we can't
* simply take a references on each of the original
* layer_differences, we have to derive new layers from the
* originals instead. */
CoglMaterialLayer *copy = _cogl_material_layer_copy (l->data);
_cogl_material_add_layer_difference (dest, copy, FALSE);
cogl_handle_unref (copy);
}
}
if (differences & COGL_MATERIAL_STATE_NEEDS_BIG_STATE)
{
if (!dest->has_big_state)
{
dest->big_state = g_slice_new (CoglMaterialBigState);
dest->has_big_state = TRUE;
}
big_state = dest->big_state;
}
else
goto check_for_blending_change;
if (differences & COGL_MATERIAL_STATE_LIGHTING)
{
memcpy (&big_state->lighting_state,
&src->big_state->lighting_state,
sizeof (CoglMaterialLightingState));
}
if (differences & COGL_MATERIAL_STATE_ALPHA_FUNC)
{
memcpy (&big_state->alpha_state,
&src->big_state->alpha_state,
sizeof (CoglMaterialAlphaFuncState));
}
if (differences & COGL_MATERIAL_STATE_BLEND)
{
memcpy (&big_state->blend_state,
&src->big_state->blend_state,
sizeof (CoglMaterialBlendState));
}
if (differences & COGL_MATERIAL_STATE_USER_SHADER)
{
if (src->big_state->user_program)
big_state->user_program =
cogl_handle_ref (src->big_state->user_program);
else
big_state->user_program = COGL_INVALID_HANDLE;
}
if (differences & COGL_MATERIAL_STATE_DEPTH)
{
memcpy (&big_state->depth_state,
&src->big_state->depth_state,
sizeof (CoglMaterialDepthState));
}
/* XXX: we shouldn't bother doing this in most cases since
* _copy_differences is typically used to initialize material state
* by copying it from the current authority, so it's not actually
* *changing* anything.
*/
check_for_blending_change:
if (differences & COGL_MATERIAL_STATE_AFFECTS_BLENDING)
handle_automatic_blend_enable (dest, differences);
dest->differences |= differences;
}
static void
_cogl_material_initialize_state (CoglMaterial *dest,
CoglMaterial *src,
CoglMaterialState state)
{
if (dest == src)
return;
if (state != COGL_MATERIAL_STATE_LAYERS)
_cogl_material_copy_differences (dest, src, state);
else
{
dest->n_layers = src->n_layers;
dest->layer_differences = NULL;
}
}
typedef gboolean (*CoglMaterialChildCallback) (CoglMaterial *child,
void *user_data);
static void
_cogl_material_foreach_child (CoglMaterial *material,
CoglMaterialChildCallback callback,
void *user_data)
{
if (material->has_children)
{
callback (material->first_child, user_data);
g_list_foreach (material->children, (GFunc)callback, user_data);
}
}
static gboolean
check_if_strong_cb (CoglMaterial *material, void *user_data)
{
gboolean *has_strong_child = user_data;
if (!material->is_weak)
{
*has_strong_child = TRUE;
return FALSE;
}
return TRUE;
}
static gboolean
has_strong_children (CoglMaterial *material)
{
gboolean has_strong_child = FALSE;
_cogl_material_foreach_child (material,
check_if_strong_cb,
&has_strong_child);
return has_strong_child;
}
static gboolean
reparent_strong_children_cb (CoglMaterial *material,
void *user_data)
{
CoglMaterial *parent = user_data;
if (material->is_weak)
return TRUE;
_cogl_material_set_parent (material, parent);
return TRUE;
}
static void
_cogl_material_pre_change_notify (CoglMaterial *material,
CoglMaterialState change,
const CoglColor *new_color)
{
CoglMaterial *authority;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* If primitives have been logged in the journal referencing the
* current state of this material we need to flush the journal
* before we can modify it... */
if (material->journal_ref_count)
{
gboolean skip_journal_flush = FALSE;
/* XXX: We don't usually need to flush the journal just due to
* color changes since material colors are logged in the
* journal's vertex buffer. The exception is when the change in
* color enables or disables the need for blending. */
if (change == COGL_MATERIAL_STATE_COLOR)
{
gboolean will_need_blending =
_cogl_material_needs_blending_enabled (material,
change,
new_color);
gboolean blend_enable = material->real_blend_enable ? TRUE : FALSE;
if (will_need_blending == blend_enable)
skip_journal_flush = TRUE;
}
if (!skip_journal_flush)
_cogl_journal_flush ();
}
/* The fixed function backend has no private state and can't
* do anything special to handle small material changes so we may as
* well try to find a better backend whenever the material changes.
*
* The programmable backends may be able to cache a lot of the code
* they generate and only need to update a small section of that
* code in response to a material change therefore we don't want to
* try searching for another backend when the material changes.
*/
if (material->backend == COGL_MATERIAL_BACKEND_FIXED)
_cogl_material_set_backend (material, COGL_MATERIAL_BACKEND_UNDEFINED);
if (material->backend != COGL_MATERIAL_BACKEND_UNDEFINED &&
backends[material->backend]->material_pre_change_notify)
backends[material->backend]->material_pre_change_notify (material,
change,
new_color);
/*
* There is an arbitrary tree of descendants of this material; any of
* which may indirectly depend on this material as the authority for
* some set of properties. (Meaning for example that one of its
* descendants derives its color or blending state from this
* material.)
*
* We can't modify any property that this material is the authority
* for unless we create another material to take its place first and
* make sure descendants reference this new material instead.
*/
if (has_strong_children (material))
{
CoglMaterial *new_authority;
COGL_STATIC_COUNTER (material_copy_on_write_counter,
"material copy on write counter",
"Increments each time a material "
"must be copied to allow modification",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, material_copy_on_write_counter);
new_authority = cogl_material_copy (material->parent);
_cogl_material_set_static_breadcrumb (new_authority,
"pre_change_notify:copy-on-write");
/* We could explicitly walk the descendants, OR together the set
* of differences that we determine this material is the
* authority on and only copy those differences copied across.
*
* Or, if we don't explicitly walk the descendants we at least
* know that material->differences represents the largest set of
* differences that this material could possibly be an authority
* on.
*
* We do the later just because it's simplest, but we might need
* to come back to this later...
*/
_cogl_material_copy_differences (new_authority, material,
material->differences);
/* Reparent the strong children of material to be children of
* new_authority instead... */
new_authority->has_children = FALSE;
new_authority->first_child = NULL;
new_authority->children = NULL;
_cogl_material_foreach_child (material,
reparent_strong_children_cb,
new_authority);
}
/* At this point we know we have a material with no strong
* dependants (though we may have some weak children) so we are now
* free to modify the material. */
material->age++;
/* If the material isn't already an authority for the state group
* being modified then we need to initialize the corresponding
* state. */
if (change & COGL_MATERIAL_STATE_ALL_SPARSE)
authority = _cogl_material_get_authority (material, change);
else
authority = material;
_cogl_material_initialize_state (material, authority, change);
/* Each material has a sorted cache of the layers it depends on
* which will need updating via _cogl_material_update_layers_cache
* if a material's layers are changed. */
if (change == COGL_MATERIAL_STATE_LAYERS)
recursively_free_layer_caches (material);
/* If the material being changed is the same as the last material we
* flushed then we keep a track of the changes so we can try to
* minimize redundant OpenGL calls if the same material is flushed
* again.
*/
if (ctx->current_material == material)
ctx->current_material_changes_since_flush |= change;
}
static void
_cogl_material_add_layer_difference (CoglMaterial *material,
CoglMaterialLayer *layer,
gboolean inc_n_layers)
{
g_return_if_fail (layer->owner == NULL);
layer->owner = material;
cogl_handle_ref ((CoglHandle)layer);
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material,
COGL_MATERIAL_STATE_LAYERS,
NULL);
material->differences |= COGL_MATERIAL_STATE_LAYERS;
material->layer_differences =
g_list_prepend (material->layer_differences, layer);
if (inc_n_layers)
material->n_layers++;
}
/* NB: If you are calling this it's your responsibility to have
* already called:
* _cogl_material_pre_change_notify (m, _CHANGE_LAYERS, NULL);
*/
static void
_cogl_material_remove_layer_difference (CoglMaterial *material,
CoglMaterialLayer *layer,
gboolean dec_n_layers)
{
g_return_if_fail (layer->owner == material);
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material,
COGL_MATERIAL_STATE_LAYERS,
NULL);
layer->owner = NULL;
cogl_handle_unref ((CoglHandle)layer);
material->differences |= COGL_MATERIAL_STATE_LAYERS;
material->layer_differences =
g_list_remove (material->layer_differences, layer);
if (dec_n_layers)
material->n_layers--;
}
static void
_cogl_material_try_reverting_layers_authority (CoglMaterial *authority,
CoglMaterial *old_authority)
{
if (authority->layer_differences == NULL && authority->parent)
{
/* If the previous _STATE_LAYERS authority has the same
* ->n_layers then we can revert to that being the authority
* again. */
if (!old_authority)
{
old_authority =
_cogl_material_get_authority (authority->parent,
COGL_MATERIAL_STATE_LAYERS);
}
if (old_authority->n_layers == authority->n_layers)
authority->differences &= ~COGL_MATERIAL_STATE_LAYERS;
}
}
static void
handle_automatic_blend_enable (CoglMaterial *material,
CoglMaterialState change)
{
gboolean blend_enable =
_cogl_material_needs_blending_enabled (material, change, NULL);
if (blend_enable != material->real_blend_enable)
{
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be
* modified.
* - If the material isn't currently an authority for the state
* being changed, then initialize that state from the current
* authority.
*/
_cogl_material_pre_change_notify (material,
COGL_MATERIAL_STATE_REAL_BLEND_ENABLE,
NULL);
material->real_blend_enable = blend_enable;
}
}
typedef struct
{
int keep_n;
int current_pos;
gboolean needs_pruning;
int first_index_to_prune;
} CoglMaterialPruneLayersInfo;
static gboolean
update_prune_layers_info_cb (CoglMaterialLayer *layer, void *user_data)
{
CoglMaterialPruneLayersInfo *state = user_data;
if (state->current_pos == state->keep_n)
{
state->needs_pruning = TRUE;
state->first_index_to_prune = layer->index;
return FALSE;
}
state->current_pos++;
return TRUE;
}
void
_cogl_material_prune_to_n_layers (CoglMaterial *material, int n)
{
CoglMaterialPruneLayersInfo state;
gboolean notified_change = TRUE;
GList *l;
GList *next;
state.keep_n = n;
state.current_pos = 0;
state.needs_pruning = FALSE;
_cogl_material_foreach_layer (material,
update_prune_layers_info_cb,
&state);
material->n_layers = n;
if (!state.needs_pruning)
return;
if (!(material->differences & COGL_MATERIAL_STATE_LAYERS))
return;
/* It's possible that this material owns some of the layers being
* discarded, so we'll need to unlink them... */
for (l = material->layer_differences; l; l = next)
{
CoglMaterialLayer *layer = l->data;
next = l->next; /* we're modifying the list we're iterating */
if (layer->index > state.first_index_to_prune)
{
if (!notified_change)
{
/* - Flush journal primitives referencing the current
* state.
* - Make sure the material has no dependants so it may
* be modified.
* - If the material isn't currently an authority for
* the state being changed, then initialize that state
* from the current authority.
*/
_cogl_material_pre_change_notify (material,
COGL_MATERIAL_STATE_LAYERS,
NULL);
notified_change = TRUE;
}
material->layer_differences =
g_list_delete_link (material->layer_differences, l);
}
}
}
static void
_cogl_material_backend_layer_change_notify (CoglMaterialLayer *layer,
CoglMaterialLayerState change)
{
int i;
/* NB: layers may be used by multiple materials which may be using
* different backends, therefore we determine which backends to
* notify based on the private state pointers for each backend...
*/
for (i = 0; i < COGL_MATERIAL_N_BACKENDS; i++)
{
if (layer->backend_priv[i] && backends[i]->layer_pre_change_notify)
backends[i]->layer_pre_change_notify (layer, change);
}
}
static unsigned int
get_n_args_for_combine_func (GLint func)
{
switch (func)
{
case GL_REPLACE:
return 1;
case GL_MODULATE:
case GL_ADD:
case GL_ADD_SIGNED:
case GL_SUBTRACT:
case GL_DOT3_RGB:
case GL_DOT3_RGBA:
return 2;
case GL_INTERPOLATE:
return 3;
}
return 0;
}
static void
_cogl_material_layer_initialize_state (CoglMaterialLayer *dest,
CoglMaterialLayer *src,
unsigned long differences)
{
CoglMaterialLayerBigState *big_state;
dest->differences |= differences;
if (differences & COGL_MATERIAL_LAYER_STATE_UNIT)
dest->unit_index = src->unit_index;
if (differences & COGL_MATERIAL_LAYER_STATE_TEXTURE)
dest->texture = src->texture;
if (differences & COGL_MATERIAL_LAYER_STATE_FILTERS)
{
dest->min_filter = src->min_filter;
dest->mag_filter = src->mag_filter;
}
if (differences & COGL_MATERIAL_LAYER_STATE_WRAP_MODES)
{
dest->wrap_mode_s = src->wrap_mode_s;
dest->wrap_mode_t = src->wrap_mode_t;
dest->wrap_mode_r = src->wrap_mode_r;
}
if (differences & COGL_MATERIAL_LAYER_STATE_NEEDS_BIG_STATE)
{
if (!dest->has_big_state)
{
dest->big_state = g_slice_new (CoglMaterialLayerBigState);
dest->has_big_state = TRUE;
}
big_state = dest->big_state;
}
else
return;
if (differences & COGL_MATERIAL_LAYER_STATE_COMBINE)
{
int n_args;
int i;
GLint func = src->big_state->texture_combine_rgb_func;
big_state->texture_combine_rgb_func = func;
n_args = get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
big_state->texture_combine_rgb_src[i] =
src->big_state->texture_combine_rgb_src[i];
big_state->texture_combine_rgb_op[i] =
src->big_state->texture_combine_rgb_op[i];
}
func = src->big_state->texture_combine_alpha_func;
big_state->texture_combine_alpha_func = func;
n_args = get_n_args_for_combine_func (func);
for (i = 0; i < n_args; i++)
{
big_state->texture_combine_alpha_src[i] =
src->big_state->texture_combine_alpha_src[i];
big_state->texture_combine_alpha_op[i] =
src->big_state->texture_combine_alpha_op[i];
}
}
if (differences & COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT)
memcpy (dest->big_state->texture_combine_constant,
src->big_state->texture_combine_constant,
sizeof (float) * 4);
if (differences & COGL_MATERIAL_LAYER_STATE_USER_MATRIX)
dest->big_state->matrix = src->big_state->matrix;
}
/* NB: This function will allocate a new derived layer if you are
* trying to change the state of a layer with dependants so you must
* always check the return value.
*
* If a new layer is returned it will be owned by required_owner.
*
* required_owner can only by NULL for new, currently unowned layers
* with no dependants.
*/
static CoglMaterialLayer *
_cogl_material_layer_pre_change_notify (CoglMaterial *required_owner,
CoglMaterialLayer *layer,
CoglMaterialLayerState change)
{
CoglTextureUnit *unit;
CoglMaterialLayer *authority;
/* Identify the case where the layer is new with no owner or
* dependants and so we don't need to do anything. */
if (layer->has_children == FALSE && layer->owner == NULL)
goto init_layer_state;
/* We only allow a NULL required_owner for new layers */
g_return_val_if_fail (required_owner != NULL, layer);
/* Unlike materials; layers are simply considered immutable once
* they have dependants - either children or another material owner.
*/
if (layer->has_children || layer->owner != required_owner)
{
CoglMaterialLayer *new = _cogl_material_layer_copy (layer);
_cogl_material_add_layer_difference (required_owner, new, FALSE);
cogl_handle_unref (new);
layer = new;
goto init_layer_state;
}
/* Note: At this point we know there is only one material dependant on
* this layer (required_owner), and there are no other layers
* dependant on this layer so it's ok to modify it. */
if (required_owner->journal_ref_count)
_cogl_journal_flush ();
_cogl_material_backend_layer_change_notify (layer, change);
/* If the layer being changed is the same as the last layer we
* flushed to the corresponding texture unit then we keep a track of
* the changes so we can try to minimize redundant OpenGL calls if
* the same layer is flushed again.
*/
unit = _cogl_get_texture_unit (_cogl_material_layer_get_unit_index (layer));
if (unit->layer == layer)
unit->layer_changes_since_flush |= change;
init_layer_state:
if (required_owner)
required_owner->age++;
/* If the material isn't already an authority for the state group
* being modified then we need to initialize the corresponding
* state. */
authority = _cogl_material_layer_get_authority (layer, change);
_cogl_material_layer_initialize_state (layer, authority, change);
return layer;
}
/* XXX: This is duplicated logic; the same as for
* _cogl_material_prune_redundant_ancestry it would be nice to find a
* way to consolidate these functions! */
static void
_cogl_material_layer_prune_redundant_ancestry (CoglMaterialLayer *layer)
{
CoglMaterialLayer *new_parent = layer->parent;
/* walk up past ancestors that are now redundant and potentially
* reparent the layer. */
while (new_parent->parent &&
(new_parent->differences | layer->differences) ==
layer->differences)
new_parent = new_parent->parent;
if (new_parent != layer->parent)
{
CoglMaterialLayer *old_parent = layer->parent;
layer->parent = cogl_handle_ref (new_parent);
/* Note: the old parent may indirectly be keeping
the new parent alive so we have to ref the new
parent before unrefing the old */
cogl_handle_unref (old_parent);
}
}
/*
* XXX: consider special casing layer->unit_index so it's not a sparse
* property so instead we can assume it's valid for all layer
* instances.
* - We would need to initialize ->unit_index in
* _cogl_material_layer_copy ().
*
* XXX: If you use this API you should consider that the given layer
* might not be writeable and so a new derived layer will be allocated
* and modified instead. The layer modified will be returned so you
* can identify when this happens.
*/
static CoglMaterialLayer *
_cogl_material_set_layer_unit (CoglMaterial *required_owner,
CoglMaterialLayer *layer,
int unit_index)
{
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_UNIT;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, change);
CoglMaterialLayer *new;
if (authority->unit_index == unit_index)
return layer;
new =
_cogl_material_layer_pre_change_notify (required_owner,
layer,
change);
if (new != layer)
layer = new;
else
{
/* If the layer we found is currently the authority on the state
* we are changing see if we can revert to one of our ancestors
* being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, change);
if (old_authority->unit_index == unit_index)
{
layer->differences &= ~change;
return layer;
}
}
}
layer->unit_index = unit_index;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= change;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
return layer;
}
typedef struct
{
/* The layer we are trying to find */
int layer_index;
/* The layer we find or untouched if not found */
CoglMaterialLayer *layer;
/* If the layer can't be found then a new layer should be
* inserted after this texture unit index... */
int insert_after;
/* When adding a layer we need the list of layers to shift up
* to a new texture unit. When removing we need the list of
* layers to shift down.
*
* Note: the list isn't sorted */
CoglMaterialLayer **layers_to_shift;
int n_layers_to_shift;
/* When adding a layer we don't need a complete list of
* layers_to_shift if we find a layer already corresponding to the
* layer_index. */
gboolean ignore_shift_layers_if_found;
} CoglMaterialLayerInfo;
/* Returns TRUE once we know there is nothing more to update */
static gboolean
update_layer_info (CoglMaterialLayer *layer,
CoglMaterialLayerInfo *layer_info)
{
if (layer->index == layer_info->layer_index)
{
layer_info->layer = layer;
if (layer_info->ignore_shift_layers_if_found)
return TRUE;
}
else if (layer->index < layer_info->layer_index)
{
int unit_index = _cogl_material_layer_get_unit_index (layer);
layer_info->insert_after = unit_index;
}
else
layer_info->layers_to_shift[layer_info->n_layers_to_shift++] =
layer;
return FALSE;
}
/* Returns FALSE to break out of a _foreach_layer () iteration */
static gboolean
update_layer_info_cb (CoglMaterialLayer *layer,
void *user_data)
{
CoglMaterialLayerInfo *layer_info = user_data;
if (update_layer_info (layer, layer_info))
return FALSE; /* break */
else
return TRUE; /* continue */
}
static void
_cogl_material_get_layer_info (CoglMaterial *material,
CoglMaterialLayerInfo *layer_info)
{
/* Note: we are assuming this material is a _STATE_LAYERS authority */
int n_layers = material->n_layers;
int i;
/* FIXME: _cogl_material_foreach_layer now calls
* _cogl_material_update_layers_cache anyway so this codepath is
* pointless! */
if (layer_info->ignore_shift_layers_if_found &&
material->layers_cache_dirty)
{
/* The expectation is that callers of
* _cogl_material_get_layer_info are likely to be modifying the
* list of layers associated with a material so in this case
* where we don't have a cache of the layers and we don't
* necessarily have to iterate all the layers of the material we
* use a foreach_layer callback instead of updating the cache
* and iterating that as below. */
_cogl_material_foreach_layer (material,
update_layer_info_cb,
layer_info);
return;
}
_cogl_material_update_layers_cache (material);
for (i = 0; i < n_layers; i++)
{
CoglMaterialLayer *layer = material->layers_cache[i];
if (update_layer_info (layer, layer_info))
return;
}
}
static CoglMaterialLayer *
_cogl_material_get_layer (CoglMaterial *material,
int layer_index)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LAYERS);
CoglMaterialLayerInfo layer_info;
CoglMaterialLayer *layer;
int unit_index;
int i;
_COGL_GET_CONTEXT (ctx, NULL);
/* The layer index of the layer we want info about */
layer_info.layer_index = layer_index;
/* If a layer already exists with the given index this will be
* updated. */
layer_info.layer = NULL;
/* If a layer isn't found for the given index we'll need to know
* where to insert a new layer. */
layer_info.insert_after = -1;
/* If a layer can't be found then we'll need to insert a new layer
* and bump up the texture unit for all layers with an index
* > layer_index. */
layer_info.layers_to_shift =
g_alloca (sizeof (CoglMaterialLayer *) * authority->n_layers);
layer_info.n_layers_to_shift = 0;
/* If an exact match is found though we don't need a complete
* list of layers with indices > layer_index... */
layer_info.ignore_shift_layers_if_found = TRUE;
_cogl_material_get_layer_info (authority, &layer_info);
if (layer_info.layer)
return layer_info.layer;
unit_index = layer_info.insert_after + 1;
if (unit_index == 0)
layer = _cogl_material_layer_copy (ctx->default_layer_0);
else
{
CoglMaterialLayer *new;
layer = _cogl_material_layer_copy (ctx->default_layer_n);
new = _cogl_material_set_layer_unit (NULL, layer, unit_index);
/* Since we passed a newly allocated layer we wouldn't expect
* _set_layer_unit() to have to allocate *another* layer. */
g_assert (new == layer);
layer->index = layer_index;
}
for (i = 0; i < layer_info.n_layers_to_shift; i++)
{
CoglMaterialLayer *shift_layer = layer_info.layers_to_shift[i];
unit_index = _cogl_material_layer_get_unit_index (shift_layer);
_cogl_material_set_layer_unit (material, shift_layer, unit_index + 1);
/* NB: shift_layer may not be writeable so _set_layer_unit()
* will allocate a derived layer internally which will become
* owned by material. Check the return value if we need to do
* anything else with this layer. */
}
_cogl_material_add_layer_difference (material, layer, TRUE);
cogl_handle_unref (layer);
return layer;
}
static CoglHandle
_cogl_material_layer_get_texture (CoglMaterialLayer *layer)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_TEXTURE);
return authority->texture;
}
static void
_cogl_material_prune_empty_layer_difference (CoglMaterial *layers_authority,
CoglMaterialLayer *layer)
{
/* Find the GList link that references the empty layer */
GList *link = g_list_find (layers_authority->layer_differences, layer);
/* No material directly owns the root node layer so this is safe... */
CoglMaterialLayer *layer_parent = layer->parent;
CoglMaterialLayerInfo layer_info;
CoglMaterial *old_layers_authority;
g_return_if_fail (link != NULL);
/* If the layer's parent doesn't have an owner then we can simply
* take ownership ourselves and drop our reference on the empty
* layer.
*/
if (layer_parent->index == layer->index && layer_parent->owner == NULL)
{
cogl_handle_ref (layer_parent);
link->data = layer->parent;
cogl_handle_unref (layer);
recursively_free_layer_caches (layers_authority);
return;
}
/* Now we want to find the layer that would become the authority for
* layer->index if we were to remove layer from
* layers_authority->layer_differences
*/
/* The layer index of the layer we want info about */
layer_info.layer_index = layer->index;
/* If a layer already exists with the given index this will be
* updated. */
layer_info.layer = NULL;
/* If a layer can't be found then we'll need to insert a new layer
* and bump up the texture unit for all layers with an index
* > layer_index. */
layer_info.layers_to_shift =
g_alloca (sizeof (CoglMaterialLayer *) * layers_authority->n_layers);
layer_info.n_layers_to_shift = 0;
/* If an exact match is found though we don't need a complete
* list of layers with indices > layer_index... */
layer_info.ignore_shift_layers_if_found = TRUE;
/* We know the default/root material isn't a LAYERS authority so
* it's safe to dereference layers_authority->parent. */
old_layers_authority =
_cogl_material_get_authority (layers_authority->parent,
COGL_MATERIAL_STATE_LAYERS);
_cogl_material_get_layer_info (old_layers_authority, &layer_info);
/* If layer is the defining layer for the corresponding ->index then
* we can't get rid of it. */
if (!layer_info.layer)
return;
/* If the layer that would become the authority for layer->index
* is layer->parent then we can simply remove the layer difference. */
if (layer_info.layer == layer->parent)
{
_cogl_material_remove_layer_difference (layers_authority, layer, FALSE);
_cogl_material_try_reverting_layers_authority (layers_authority,
old_layers_authority);
}
}
static void
_cogl_material_set_layer_texture (CoglMaterial *material,
int layer_index,
CoglHandle texture,
gboolean overriden,
GLuint slice_gl_texture,
GLenum slice_gl_target)
{
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_TEXTURE;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialLayer *new;
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
if (authority->texture_overridden == overriden &&
authority->texture == texture &&
(authority->texture_overridden == FALSE ||
(authority->slice_gl_texture == slice_gl_texture &&
authority->slice_gl_target == slice_gl_target)))
return;
new = _cogl_material_layer_pre_change_notify (material, layer, change);
if (new != layer)
layer = new;
else
{
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, change);
if (old_authority->texture_overridden == overriden &&
old_authority->texture == texture &&
(old_authority->texture_overridden == FALSE ||
(old_authority->slice_gl_texture == slice_gl_texture &&
old_authority->slice_gl_target == slice_gl_target)))
{
layer->differences &= ~change;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
goto changed;
}
}
}
if (texture != COGL_INVALID_HANDLE)
cogl_handle_ref (texture);
if (layer == authority &&
layer->texture != COGL_INVALID_HANDLE)
cogl_handle_unref (layer->texture);
layer->texture = texture;
layer->texture_overridden = FALSE;
layer->slice_gl_texture = slice_gl_texture;
layer->slice_gl_target = slice_gl_target;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= change;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
changed:
handle_automatic_blend_enable (material, COGL_MATERIAL_STATE_LAYERS);
}
static void
_cogl_material_set_layer_gl_texture_slice (CoglHandle handle,
int layer_index,
CoglHandle texture,
GLuint slice_gl_texture,
GLenum slice_gl_target)
{
CoglMaterial *material = COGL_MATERIAL (handle);
g_return_if_fail (cogl_is_material (handle));
/* GL texture overrides can only be set in association with a parent
* CoglTexture */
g_return_if_fail (cogl_is_texture (texture));
_cogl_material_set_layer_texture (material,
layer_index,
texture,
TRUE, /* slice override */
slice_gl_texture,
slice_gl_target);
}
/* XXX: deprecate and replace with cogl_material_set_layer_texture?
*
* Originally I was planning on allowing users to set shaders somehow
* on layers (thus the ambiguous name), but now I wonder if we will do
* that with a more explicit "snippets" API and materials will have
* hooks defined to receive these snippets.
*/
void
cogl_material_set_layer (CoglHandle handle,
int layer_index,
CoglHandle texture)
{
CoglMaterial *material = COGL_MATERIAL (handle);
g_return_if_fail (cogl_is_material (handle));
g_return_if_fail (texture == COGL_INVALID_HANDLE ||
cogl_is_texture (texture));
_cogl_material_set_layer_texture (material,
layer_index,
texture,
FALSE, /* slice override */
0, /* slice_gl_texture */
0); /* slice_gl_target */
}
typedef struct
{
int i;
CoglMaterial *material;
unsigned long fallback_layers;
} CoglMaterialFallbackState;
static gboolean
fallback_layer_cb (CoglMaterialLayer *layer, void *user_data)
{
CoglMaterialFallbackState *state = user_data;
CoglMaterial *material = state->material;
CoglHandle texture = _cogl_material_layer_get_texture (layer);
GLenum gl_target;
COGL_STATIC_COUNTER (layer_fallback_counter,
"layer fallback counter",
"Increments each time a layer's texture is "
"forced to a fallback texture",
0 /* no application private data */);
_COGL_GET_CONTEXT (ctx, FALSE);
if (!(state->fallback_layers & 1<<state->i))
return TRUE;
COGL_COUNTER_INC (_cogl_uprof_context, layer_fallback_counter);
if (G_LIKELY (texture != COGL_INVALID_HANDLE))
cogl_texture_get_gl_texture (texture, NULL, &gl_target);
else
gl_target = GL_TEXTURE_2D;
if (gl_target == GL_TEXTURE_2D)
texture = ctx->default_gl_texture_2d_tex;
#ifdef HAVE_COGL_GL
else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
texture = ctx->default_gl_texture_rect_tex;
#endif
else
{
g_warning ("We don't have a fallback texture we can use to fill "
"in for an invalid material layer, since it was "
"using an unsupported texture target ");
/* might get away with this... */
texture = ctx->default_gl_texture_2d_tex;
}
cogl_material_set_layer (material, layer->index, texture);
state->i++;
return TRUE;
}
void
_cogl_material_set_layer_wrap_modes (CoglMaterial *material,
CoglMaterialLayer *layer,
CoglMaterialLayer *authority,
CoglMaterialWrapModeInternal wrap_mode_s,
CoglMaterialWrapModeInternal wrap_mode_t,
CoglMaterialWrapModeInternal wrap_mode_r)
{
CoglMaterialLayer *new;
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
if (authority->wrap_mode_s == wrap_mode_s &&
authority->wrap_mode_t == wrap_mode_t &&
authority->wrap_mode_r == wrap_mode_r)
return;
new = _cogl_material_layer_pre_change_notify (material, layer, change);
if (new != layer)
layer = new;
else
{
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, change);
if (old_authority->wrap_mode_s == wrap_mode_s &&
old_authority->wrap_mode_t == wrap_mode_t &&
old_authority->wrap_mode_r == wrap_mode_r)
{
layer->differences &= ~change;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
return;
}
}
}
layer->wrap_mode_s = wrap_mode_s;
layer->wrap_mode_t = wrap_mode_t;
layer->wrap_mode_r = wrap_mode_r;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= change;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
}
static CoglMaterialWrapModeInternal
public_to_internal_wrap_mode (CoglMaterialWrapMode mode)
{
return (CoglMaterialWrapModeInternal)mode;
}
static CoglMaterialWrapMode
internal_to_public_wrap_mode (CoglMaterialWrapModeInternal internal_mode)
{
g_return_val_if_fail (internal_mode !=
COGL_MATERIAL_WRAP_MODE_INTERNAL_CLAMP_TO_BORDER,
COGL_MATERIAL_WRAP_MODE_AUTOMATIC);
return (CoglMaterialWrapMode)internal_mode;
}
void
cogl_material_set_layer_wrap_mode_s (CoglHandle handle,
int layer_index,
CoglMaterialWrapMode mode)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialWrapModeInternal internal_mode =
public_to_internal_wrap_mode (mode);
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
_cogl_material_set_layer_wrap_modes (material, layer, authority,
internal_mode,
authority->wrap_mode_t,
authority->wrap_mode_r);
}
void
cogl_material_set_layer_wrap_mode_t (CoglHandle handle,
int layer_index,
CoglMaterialWrapMode mode)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialWrapModeInternal internal_mode =
public_to_internal_wrap_mode (mode);
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
_cogl_material_set_layer_wrap_modes (material, layer, authority,
authority->wrap_mode_s,
internal_mode,
authority->wrap_mode_r);
}
/* TODO: this should be made public once we add support for 3D
textures in Cogl */
void
_cogl_material_set_layer_wrap_mode_r (CoglHandle handle,
int layer_index,
CoglMaterialWrapMode mode)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialWrapModeInternal internal_mode =
public_to_internal_wrap_mode (mode);
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
_cogl_material_set_layer_wrap_modes (material, layer, authority,
authority->wrap_mode_s,
authority->wrap_mode_t,
internal_mode);
}
void
cogl_material_set_layer_wrap_mode (CoglHandle handle,
int layer_index,
CoglMaterialWrapMode mode)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialWrapModeInternal internal_mode =
public_to_internal_wrap_mode (mode);
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
_cogl_material_set_layer_wrap_modes (material, layer, authority,
internal_mode,
internal_mode,
internal_mode);
/* XXX: I wonder if we should really be duplicating the mode into
* the 'r' wrap mode too? */
}
/* FIXME: deprecate this API */
CoglMaterialWrapMode
cogl_material_layer_get_wrap_mode_s (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *authority;
g_return_val_if_fail (cogl_is_material_layer (handle), FALSE);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
return internal_to_public_wrap_mode (authority->wrap_mode_s);
}
CoglMaterialWrapMode
cogl_material_get_layer_wrap_mode_s (CoglHandle handle, int layer_index)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayer *layer;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* FIXME: we shouldn't ever construct a layer in a getter function */
return cogl_material_layer_get_wrap_mode_s ((CoglHandle)layer);
}
/* FIXME: deprecate this API */
CoglMaterialWrapMode
cogl_material_layer_get_wrap_mode_t (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *authority;
g_return_val_if_fail (cogl_is_material_layer (handle), FALSE);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
return internal_to_public_wrap_mode (authority->wrap_mode_t);
}
CoglMaterialWrapMode
cogl_material_get_layer_wrap_mode_t (CoglHandle handle, int layer_index)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayer *layer;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* FIXME: we shouldn't ever construct a layer in a getter function */
return cogl_material_layer_get_wrap_mode_t ((CoglHandle)layer);
}
CoglMaterialWrapMode
_cogl_material_layer_get_wrap_mode_r (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_WRAP_MODES;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, change);
return internal_to_public_wrap_mode (authority->wrap_mode_r);
}
/* TODO: make this public when we expose 3D textures. */
CoglMaterialWrapMode
_cogl_material_get_layer_wrap_mode_r (CoglHandle handle, int layer_index)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayer *layer;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
return _cogl_material_layer_get_wrap_mode_r (layer);
}
static void
_cogl_material_layer_get_wrap_modes (CoglMaterialLayer *layer,
CoglMaterialWrapModeInternal *wrap_mode_s,
CoglMaterialWrapModeInternal *wrap_mode_t,
CoglMaterialWrapModeInternal *wrap_mode_r)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_WRAP_MODES);
*wrap_mode_s = authority->wrap_mode_s;
*wrap_mode_t = authority->wrap_mode_t;
*wrap_mode_r = authority->wrap_mode_r;
}
typedef struct
{
CoglMaterial *material;
CoglMaterialWrapModeOverrides *wrap_mode_overrides;
int i;
} CoglMaterialWrapModeOverridesState;
static gboolean
apply_wrap_mode_overrides_cb (CoglMaterialLayer *layer,
void *user_data)
{
CoglMaterialWrapModeOverridesState *state = user_data;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_WRAP_MODES);
CoglMaterialWrapModeInternal wrap_mode_s;
CoglMaterialWrapModeInternal wrap_mode_t;
CoglMaterialWrapModeInternal wrap_mode_r;
g_return_val_if_fail (state->i < 32, FALSE);
wrap_mode_s = state->wrap_mode_overrides->values[state->i].s;
if (wrap_mode_s == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_s = (CoglMaterialWrapModeInternal)authority->wrap_mode_s;
wrap_mode_t = state->wrap_mode_overrides->values[state->i].t;
if (wrap_mode_t == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_t = (CoglMaterialWrapModeInternal)authority->wrap_mode_t;
wrap_mode_r = state->wrap_mode_overrides->values[state->i].r;
if (wrap_mode_r == COGL_MATERIAL_WRAP_MODE_OVERRIDE_NONE)
wrap_mode_r = (CoglMaterialWrapModeInternal)authority->wrap_mode_r;
_cogl_material_set_layer_wrap_modes (state->material,
layer,
authority,
wrap_mode_s,
wrap_mode_t,
wrap_mode_r);
state->i++;
return TRUE;
}
typedef struct
{
CoglMaterial *material;
GLuint gl_texture;
} CoglMaterialOverrideLayerState;
static gboolean
override_layer_texture_cb (CoglMaterialLayer *layer, void *user_data)
{
CoglMaterialOverrideLayerState *state = user_data;
CoglHandle texture;
GLenum gl_target;
texture = _cogl_material_layer_get_texture (layer);
if (texture != COGL_INVALID_HANDLE)
gl_target = cogl_texture_get_gl_texture (texture, NULL, &gl_target);
else
gl_target = GL_TEXTURE_2D;
_cogl_material_set_layer_gl_texture_slice (state->material,
layer->index,
texture,
state->gl_texture,
gl_target);
return TRUE;
}
void
_cogl_material_apply_overrides (CoglMaterial *material,
CoglMaterialFlushOptions *options)
{
COGL_STATIC_COUNTER (apply_overrides_counter,
"material overrides counter",
"Increments each time we have to apply "
"override options to a material",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, apply_overrides_counter);
if (options->flags & COGL_MATERIAL_FLUSH_DISABLE_MASK)
{
int i;
/* NB: we can assume that once we see one bit to disable
* a layer, all subsequent layers are also disabled. */
for (i = 0; i < 32 && options->disable_layers & (1<<i); i++)
;
_cogl_material_prune_to_n_layers (material, i);
}
if (options->flags & COGL_MATERIAL_FLUSH_FALLBACK_MASK)
{
CoglMaterialFallbackState state;
state.i = 0;
state.material = material;
state.fallback_layers = options->fallback_layers;
_cogl_material_foreach_layer (material,
fallback_layer_cb,
&state);
}
if (options->flags & COGL_MATERIAL_FLUSH_LAYER0_OVERRIDE)
{
CoglMaterialOverrideLayerState state;
_cogl_material_prune_to_n_layers (material, 1);
/* NB: we are overriding the first layer, but we don't know
* the user's given layer_index, which is why we use
* _cogl_material_foreach_layer() here even though we know
* there's only one layer. */
state.material = material;
state.gl_texture = options->layer0_override_texture;
_cogl_material_foreach_layer (material,
override_layer_texture_cb,
&state);
}
if (options->flags & COGL_MATERIAL_FLUSH_WRAP_MODE_OVERRIDES)
{
CoglMaterialWrapModeOverridesState state;
state.material = material;
state.wrap_mode_overrides = &options->wrap_mode_overrides;
state.i = 0;
_cogl_material_foreach_layer (material,
apply_wrap_mode_overrides_cb,
&state);
}
}
static gboolean
_cogl_material_layer_texture_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
if (authority0->texture != authority1->texture)
return FALSE;
return TRUE;
}
/* Determine the mask of differences between two layers.
*
* XXX: If layers and materials could both be cast to a common Tree
* type of some kind then we could have a unified
* compare_differences() function.
*/
static unsigned long
_cogl_material_layer_compare_differences (CoglMaterialLayer *layer0,
CoglMaterialLayer *layer1)
{
CoglMaterialLayer *node0;
CoglMaterialLayer *node1;
int len0;
int len1;
int len0_index;
int len1_index;
int count;
int i;
CoglMaterialLayer *common_ancestor = NULL;
unsigned long layers_difference = 0;
_COGL_GET_CONTEXT (ctx, 0);
/* Algorithm:
*
* 1) Walk the ancestors of each layer to the root node, adding a
* pointer to each ancester node to two GArrays:
* ctx->material0_nodes, and ctx->material1_nodes.
*
* 2) Compare the arrays to find the nodes where they stop to
* differ.
*
* 3) For each array now iterate from index 0 to the first node of
* difference ORing that nodes ->difference mask into the final
* material_differences mask.
*/
g_array_set_size (ctx->material0_nodes, 0);
g_array_set_size (ctx->material1_nodes, 0);
for (node0 = layer0; node0; node0 = node0->parent)
g_array_append_vals (ctx->material0_nodes, &node0, 1);
for (node1 = layer1; node1; node1 = node1->parent)
g_array_append_vals (ctx->material1_nodes, &node1, 1);
len0 = ctx->material0_nodes->len;
len1 = ctx->material1_nodes->len;
/* There's no point looking at the last entries since we know both
* layers must have the same default layer as their root node. */
len0_index = len0 - 2;
len1_index = len1 - 2;
count = MIN (len0, len1) - 1;
for (i = 0; i < count; i++)
{
node0 = g_array_index (ctx->material0_nodes,
CoglMaterialLayer *, len0_index--);
node1 = g_array_index (ctx->material1_nodes,
CoglMaterialLayer *, len1_index--);
if (node0 != node1)
{
common_ancestor = node0->parent;
break;
}
}
/* If we didn't already find the first the common_ancestor ancestor
* that's because one material is a direct descendant of the other
* and in this case the first common ancestor is the last node we
* looked at. */
if (!common_ancestor)
common_ancestor = node0;
count = len0 - 1;
for (i = 0; i < count; i++)
{
node0 = g_array_index (ctx->material0_nodes, CoglMaterialLayer *, i);
if (node0 == common_ancestor)
break;
layers_difference |= node0->differences;
}
count = len1 - 1;
for (i = 0; i < count; i++)
{
node1 = g_array_index (ctx->material1_nodes, CoglMaterialLayer *, i);
if (node1 == common_ancestor)
break;
layers_difference |= node1->differences;
}
return layers_difference;
}
static gboolean
_cogl_material_layer_combine_state_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
CoglMaterialLayerBigState *big_state0 = authority0->big_state;
CoglMaterialLayerBigState *big_state1 = authority1->big_state;
int n_args;
int i;
if (big_state0->texture_combine_rgb_func !=
big_state1->texture_combine_rgb_func)
return FALSE;
if (big_state0->texture_combine_alpha_func !=
big_state1->texture_combine_alpha_func)
return FALSE;
n_args =
get_n_args_for_combine_func (big_state0->texture_combine_rgb_func);
for (i = 0; i < n_args; i++)
{
if ((big_state0->texture_combine_rgb_src[i] !=
big_state1->texture_combine_rgb_src[i]) ||
(big_state0->texture_combine_rgb_op[i] !=
big_state1->texture_combine_rgb_op[i]))
return FALSE;
}
n_args =
get_n_args_for_combine_func (big_state0->texture_combine_alpha_func);
for (i = 0; i < n_args; i++)
{
if ((big_state0->texture_combine_alpha_src[i] !=
big_state1->texture_combine_alpha_src[i]) ||
(big_state0->texture_combine_alpha_op[i] !=
big_state1->texture_combine_alpha_op[i]))
return FALSE;
}
return TRUE;
}
static gboolean
_cogl_material_layer_combine_constant_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
return memcmp (authority0->big_state->texture_combine_constant,
authority1->big_state->texture_combine_constant,
sizeof (float) * 4) == 0 ? TRUE : FALSE;
}
static gboolean
_cogl_material_layer_filters_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
if (authority0->mag_filter != authority1->mag_filter)
return FALSE;
if (authority0->min_filter != authority1->min_filter)
return FALSE;
return TRUE;
}
static gboolean
_cogl_material_layer_wrap_modes_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
if (authority0->wrap_mode_s != authority1->wrap_mode_s ||
authority0->wrap_mode_t != authority1->wrap_mode_t ||
authority0->wrap_mode_r != authority1->wrap_mode_r)
return FALSE;
return TRUE;
}
static gboolean
_cogl_material_layer_user_matrix_equal (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1)
{
CoglMaterialLayerBigState *big_state0 = authority0->big_state;
CoglMaterialLayerBigState *big_state1 = authority1->big_state;
if (!cogl_matrix_equal (&big_state0->matrix, &big_state1->matrix))
return FALSE;
return TRUE;
}
typedef gboolean
(*CoglMaterialLayerStateComparitor) (CoglMaterialLayer *authority0,
CoglMaterialLayer *authority1);
static gboolean
layer_state_equal (CoglMaterialLayerState state,
CoglMaterialLayer *layer0,
CoglMaterialLayer *layer1,
CoglMaterialLayerStateComparitor comparitor)
{
CoglMaterialLayer *authority0 =
_cogl_material_layer_get_authority (layer0, state);
CoglMaterialLayer *authority1 =
_cogl_material_layer_get_authority (layer1, state);
return comparitor (authority0, authority1);
}
static gboolean
_cogl_material_layer_equal (CoglMaterialLayer *layer0,
CoglMaterialLayer *layer1)
{
unsigned long layers_difference;
if (layer0 == layer1)
return TRUE;
layers_difference =
_cogl_material_layer_compare_differences (layer0, layer1);
if (layers_difference & COGL_MATERIAL_LAYER_STATE_TEXTURE &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_TEXTURE,
layer0, layer1,
_cogl_material_layer_texture_equal))
return FALSE;
if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_COMBINE,
layer0, layer1,
_cogl_material_layer_combine_state_equal))
return FALSE;
if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT,
layer0, layer1,
_cogl_material_layer_combine_constant_equal))
return FALSE;
if (layers_difference & COGL_MATERIAL_LAYER_STATE_FILTERS &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_FILTERS,
layer0, layer1,
_cogl_material_layer_filters_equal))
return FALSE;
if (layers_difference & COGL_MATERIAL_LAYER_STATE_WRAP_MODES &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_WRAP_MODES,
layer0, layer1,
_cogl_material_layer_wrap_modes_equal))
return FALSE;
if (layers_difference & COGL_MATERIAL_LAYER_STATE_USER_MATRIX &&
!layer_state_equal (COGL_MATERIAL_LAYER_STATE_USER_MATRIX,
layer0, layer1,
_cogl_material_layer_user_matrix_equal))
return FALSE;
return TRUE;
}
static gboolean
_cogl_material_color_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
return cogl_color_equal (&authority0->color, &authority1->color);
}
static gboolean
_cogl_material_lighting_state_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
CoglMaterialLightingState *state0 = &authority0->big_state->lighting_state;
CoglMaterialLightingState *state1 = &authority1->big_state->lighting_state;
if (memcmp (state0->ambient, state1->ambient, sizeof (float) * 4) != 0)
return FALSE;
if (memcmp (state0->diffuse, state1->diffuse, sizeof (float) * 4) != 0)
return FALSE;
if (memcmp (state0->specular, state1->specular, sizeof (float) * 4) != 0)
return FALSE;
if (memcmp (state0->emission, state1->emission, sizeof (float) * 4) != 0)
return FALSE;
if (state0->shininess != state1->shininess)
return FALSE;
return TRUE;
}
static gboolean
_cogl_material_alpha_state_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
CoglMaterialAlphaFuncState *alpha_state0 =
&authority0->big_state->alpha_state;
CoglMaterialAlphaFuncState *alpha_state1 =
&authority1->big_state->alpha_state;
if (alpha_state0->alpha_func != alpha_state1->alpha_func ||
alpha_state0->alpha_func_reference != alpha_state1->alpha_func_reference)
return FALSE;
else
return TRUE;
}
static gboolean
_cogl_material_blend_state_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
CoglMaterialBlendState *blend_state0 = &authority0->big_state->blend_state;
CoglMaterialBlendState *blend_state1 = &authority1->big_state->blend_state;
#ifndef HAVE_COGL_GLES
if (blend_state0->blend_equation_rgb != blend_state1->blend_equation_rgb)
return FALSE;
if (blend_state0->blend_equation_alpha !=
blend_state1->blend_equation_alpha)
return FALSE;
if (blend_state0->blend_src_factor_alpha !=
blend_state1->blend_src_factor_alpha)
return FALSE;
if (blend_state0->blend_dst_factor_alpha !=
blend_state1->blend_dst_factor_alpha)
return FALSE;
#endif
if (blend_state0->blend_src_factor_rgb !=
blend_state1->blend_src_factor_rgb)
return FALSE;
if (blend_state0->blend_dst_factor_rgb !=
blend_state1->blend_dst_factor_rgb)
return FALSE;
#ifndef HAVE_COGL_GLES
if (!cogl_color_equal (&blend_state0->blend_constant,
&blend_state1->blend_constant))
return FALSE;
#endif
return TRUE;
}
static gboolean
_cogl_material_depth_state_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
if (authority0->big_state->depth_state.depth_test_enabled == FALSE &&
authority1->big_state->depth_state.depth_test_enabled == FALSE)
return TRUE;
else
return memcmp (&authority0->big_state->depth_state,
&authority1->big_state->depth_state,
sizeof (CoglMaterialDepthState)) == 0;
}
static gboolean
_cogl_material_layers_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
int i;
if (authority0->n_layers != authority1->n_layers)
return FALSE;
_cogl_material_update_layers_cache (authority0);
_cogl_material_update_layers_cache (authority1);
for (i = 0; i < authority0->n_layers; i++)
{
if (!_cogl_material_layer_equal (authority0->layers_cache[i],
authority1->layers_cache[i]))
return FALSE;
}
return TRUE;
}
/* Determine the mask of differences between two materials */
static unsigned long
_cogl_material_compare_differences (CoglMaterial *material0,
CoglMaterial *material1)
{
CoglMaterial *node0;
CoglMaterial *node1;
int len0;
int len1;
int len0_index;
int len1_index;
int count;
int i;
CoglMaterial *common_ancestor = NULL;
unsigned long materials_difference = 0;
_COGL_GET_CONTEXT (ctx, 0);
/* Algorithm:
*
* 1) Walk the ancestors of each layer to the root node, adding a
* pointer to each ancester node to two GArrays:
* ctx->material0_nodes, and ctx->material1_nodes.
*
* 2) Compare the arrays to find the nodes where they stop to
* differ.
*
* 3) For each array now iterate from index 0 to the first node of
* difference ORing that nodes ->difference mask into the final
* material_differences mask.
*/
g_array_set_size (ctx->material0_nodes, 0);
g_array_set_size (ctx->material1_nodes, 0);
for (node0 = material0; node0; node0 = node0->parent)
g_array_append_vals (ctx->material0_nodes, &node0, 1);
for (node1 = material1; node1; node1 = node1->parent)
g_array_append_vals (ctx->material1_nodes, &node1, 1);
len0 = ctx->material0_nodes->len;
len1 = ctx->material1_nodes->len;
/* There's no point looking at the last entries since we know both
* layers must have the same default layer as their root node. */
len0_index = len0 - 2;
len1_index = len1 - 2;
count = MIN (len0, len1) - 1;
for (i = 0; i < count; i++)
{
node0 = g_array_index (ctx->material0_nodes,
CoglMaterial *, len0_index--);
node1 = g_array_index (ctx->material1_nodes,
CoglMaterial *, len1_index--);
if (node0 != node1)
{
common_ancestor = node0->parent;
break;
}
}
/* If we didn't already find the first the common_ancestor ancestor
* that's because one material is a direct descendant of the other
* and in this case the first common ancestor is the last node we
* looked at. */
if (!common_ancestor)
common_ancestor = node0;
count = len0 - 1;
for (i = 0; i < count; i++)
{
node0 = g_array_index (ctx->material0_nodes, CoglMaterial *, i);
if (node0 == common_ancestor)
break;
materials_difference |= node0->differences;
}
count = len1 - 1;
for (i = 0; i < count; i++)
{
node1 = g_array_index (ctx->material1_nodes, CoglMaterial *, i);
if (node1 == common_ancestor)
break;
materials_difference |= node1->differences;
}
return materials_difference;
}
static gboolean
simple_property_equal (CoglMaterial *material0,
CoglMaterial *material1,
unsigned long materials_difference,
CoglMaterialState state,
CoglMaterialStateComparitor comparitor)
{
if (materials_difference & state)
{
if (!comparitor (_cogl_material_get_authority (material0, state),
_cogl_material_get_authority (material1, state)))
return FALSE;
}
return TRUE;
}
/* Comparison of two arbitrary materials is done by:
* 1) walking up the parents of each material until a common
* ancestor is found, and at each step ORing together the
* difference masks.
*
* 2) using the final difference mask to determine which state
* groups to compare.
*
* This is used by the Cogl journal to compare materials so that it
* can split up geometry that needs different OpenGL state.
*
* It is acceptable to have false negatives - although they will result
* in redundant OpenGL calls that try and update the state.
*
* False positives aren't allowed.
*/
gboolean
_cogl_material_equal (CoglHandle handle0,
CoglHandle handle1,
gboolean skip_gl_color)
{
CoglMaterial *material0 = COGL_MATERIAL (handle0);
CoglMaterial *material1 = COGL_MATERIAL (handle1);
unsigned long materials_difference;
if (material0 == material1)
return TRUE;
/* First check non-sparse properties */
if (material0->real_blend_enable != material1->real_blend_enable)
return FALSE;
/* Then check sparse properties */
materials_difference =
_cogl_material_compare_differences (material0, material1);
if (materials_difference & COGL_MATERIAL_STATE_COLOR &&
!skip_gl_color)
{
CoglMaterialState state = COGL_MATERIAL_STATE_COLOR;
CoglMaterial *authority0 =
_cogl_material_get_authority (material0, state);
CoglMaterial *authority1 =
_cogl_material_get_authority (material1, state);
if (!cogl_color_equal (&authority0->color, &authority1->color))
return FALSE;
}
if (!simple_property_equal (material0, material1,
materials_difference,
COGL_MATERIAL_STATE_LIGHTING,
_cogl_material_lighting_state_equal))
return FALSE;
if (!simple_property_equal (material0, material1,
materials_difference,
COGL_MATERIAL_STATE_ALPHA_FUNC,
_cogl_material_alpha_state_equal))
return FALSE;
/* We don't need to compare the detailed blending state if we know
* blending is disabled for both materials. */
if (material0->real_blend_enable &&
materials_difference & COGL_MATERIAL_STATE_BLEND)
{
CoglMaterialState state = COGL_MATERIAL_STATE_BLEND;
CoglMaterial *authority0 =
_cogl_material_get_authority (material0, state);
CoglMaterial *authority1 =
_cogl_material_get_authority (material1, state);
if (!_cogl_material_blend_state_equal (authority0, authority1))
return FALSE;
}
/* XXX: we don't need to compare the BLEND_ENABLE state because it's
* already reflected in ->real_blend_enable */
#if 0
if (!simple_property_equal (material0, material1,
materials_difference,
COGL_MATERIAL_STATE_BLEND,
_cogl_material_blend_enable_equal))
return FALSE;
#endif
if (!simple_property_equal (material0, material1,
materials_difference,
COGL_MATERIAL_STATE_DEPTH,
_cogl_material_depth_state_equal))
return FALSE;
if (!simple_property_equal (material0, material1,
materials_difference,
COGL_MATERIAL_STATE_LAYERS,
_cogl_material_layers_equal))
return FALSE;
return TRUE;
}
void
cogl_material_get_color (CoglHandle handle,
CoglColor *color)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_COLOR);
*color = authority->color;
}
/* This is used heavily by the cogl journal when logging quads */
void
_cogl_material_get_colorubv (CoglHandle handle,
guint8 *color)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_COLOR);
_cogl_color_get_rgba_4ubv (&authority->color, color);
}
static void
_cogl_material_prune_redundant_ancestry (CoglMaterial *material)
{
CoglMaterial *new_parent = material->parent;
/* walk up past ancestors that are now redundant and potentially
* reparent the material. */
while (new_parent->parent &&
(new_parent->differences | material->differences) ==
material->differences)
new_parent = new_parent->parent;
if (new_parent != material->parent)
{
CoglMaterial *old_parent = material->parent;
material->parent = cogl_handle_ref (new_parent);
/* Note: the old parent may indirectly be keeping
the new parent alive so we have to ref the new
parent before unrefing the old */
cogl_handle_unref (old_parent);
}
}
static void
_cogl_material_update_authority (CoglMaterial *material,
CoglMaterial *authority,
CoglMaterialState state,
CoglMaterialStateComparitor comparitor)
{
/* If we are the current authority see if we can revert to one of
* our ancestors being the authority */
if (material == authority && authority->parent != NULL)
{
CoglMaterial *old_authority =
_cogl_material_get_authority (authority->parent, state);
if (comparitor (authority, old_authority))
material->differences &= ~state;
}
else if (material != authority)
{
/* If we weren't previously the authority on this state then we
* need to extended our differences mask and so it's possible
* that some of our ancestry will now become redundant, so we
* aim to reparent ourselves if that's true... */
material->differences |= state;
_cogl_material_prune_redundant_ancestry (material);
}
}
void
cogl_material_set_color (CoglHandle handle,
const CoglColor *color)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_COLOR;
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
if (cogl_color_equal (color, &authority->color))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, color);
material->color = *color;
_cogl_material_update_authority (material, authority, state,
_cogl_material_color_equal);
handle_automatic_blend_enable (material, state);
}
void
cogl_material_set_color4ub (CoglHandle handle,
guint8 red,
guint8 green,
guint8 blue,
guint8 alpha)
{
CoglColor color;
cogl_color_set_from_4ub (&color, red, green, blue, alpha);
cogl_material_set_color (handle, &color);
}
void
cogl_material_set_color4f (CoglHandle handle,
float red,
float green,
float blue,
float alpha)
{
CoglColor color;
cogl_color_set_from_4f (&color, red, green, blue, alpha);
cogl_material_set_color (handle, &color);
}
CoglMaterialBlendEnable
_cogl_material_get_blend_enabled (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);;
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_BLEND_ENABLE);
return authority->blend_enable;
}
static gboolean
_cogl_material_blend_enable_equal (CoglMaterial *authority0,
CoglMaterial *authority1)
{
return authority0->blend_enable == authority1->blend_enable ? TRUE : FALSE;
}
void
_cogl_material_set_blend_enabled (CoglHandle handle,
CoglMaterialBlendEnable enable)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_BLEND_ENABLE;
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
g_return_if_fail (enable > 1 &&
"don't pass TRUE or FALSE to _set_blend_enabled!");
authority = _cogl_material_get_authority (material, state);
if (authority->blend_enable == enable)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
material->blend_enable = enable;
_cogl_material_update_authority (material, authority, state,
_cogl_material_blend_enable_equal);
handle_automatic_blend_enable (material, state);
}
void
cogl_material_get_ambient (CoglHandle handle,
CoglColor *ambient)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LIGHTING);
cogl_color_init_from_4fv (ambient,
authority->big_state->lighting_state.ambient);
}
void
cogl_material_set_ambient (CoglHandle handle,
const CoglColor *ambient)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_LIGHTING;
CoglMaterial *authority;
CoglMaterialLightingState *lighting_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
lighting_state = &authority->big_state->lighting_state;
if (cogl_color_equal (ambient, &lighting_state->ambient))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
lighting_state = &material->big_state->lighting_state;
lighting_state->ambient[0] = cogl_color_get_red_float (ambient);
lighting_state->ambient[1] = cogl_color_get_green_float (ambient);
lighting_state->ambient[2] = cogl_color_get_blue_float (ambient);
lighting_state->ambient[3] = cogl_color_get_alpha_float (ambient);
_cogl_material_update_authority (material, authority, state,
_cogl_material_lighting_state_equal);
handle_automatic_blend_enable (material, state);
}
void
cogl_material_get_diffuse (CoglHandle handle,
CoglColor *diffuse)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LIGHTING);
cogl_color_init_from_4fv (diffuse,
authority->big_state->lighting_state.diffuse);
}
void
cogl_material_set_diffuse (CoglHandle handle,
const CoglColor *diffuse)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_LIGHTING;
CoglMaterial *authority;
CoglMaterialLightingState *lighting_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
lighting_state = &authority->big_state->lighting_state;
if (cogl_color_equal (diffuse, &lighting_state->diffuse))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
lighting_state = &material->big_state->lighting_state;
lighting_state->diffuse[0] = cogl_color_get_red_float (diffuse);
lighting_state->diffuse[1] = cogl_color_get_green_float (diffuse);
lighting_state->diffuse[2] = cogl_color_get_blue_float (diffuse);
lighting_state->diffuse[3] = cogl_color_get_alpha_float (diffuse);
_cogl_material_update_authority (material, authority, state,
_cogl_material_lighting_state_equal);
handle_automatic_blend_enable (material, state);
}
void
cogl_material_set_ambient_and_diffuse (CoglHandle handle,
const CoglColor *color)
{
cogl_material_set_ambient (handle, color);
cogl_material_set_diffuse (handle, color);
}
void
cogl_material_get_specular (CoglHandle handle,
CoglColor *specular)
{
CoglMaterial *authority = COGL_MATERIAL (handle);
g_return_if_fail (cogl_is_material (handle));
while (!(authority->differences & COGL_MATERIAL_STATE_LIGHTING))
authority = authority->parent;
cogl_color_init_from_4fv (specular,
authority->big_state->lighting_state.specular);
}
void
cogl_material_set_specular (CoglHandle handle, const CoglColor *specular)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
CoglMaterialState state = COGL_MATERIAL_STATE_LIGHTING;
CoglMaterialLightingState *lighting_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
lighting_state = &authority->big_state->lighting_state;
if (cogl_color_equal (specular, &lighting_state->specular))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
lighting_state = &material->big_state->lighting_state;
lighting_state->specular[0] = cogl_color_get_red_float (specular);
lighting_state->specular[1] = cogl_color_get_green_float (specular);
lighting_state->specular[2] = cogl_color_get_blue_float (specular);
lighting_state->specular[3] = cogl_color_get_alpha_float (specular);
_cogl_material_update_authority (material, authority, state,
_cogl_material_lighting_state_equal);
handle_automatic_blend_enable (material, state);
}
float
cogl_material_get_shininess (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), 0);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LIGHTING);
return authority->big_state->lighting_state.shininess;
}
void
cogl_material_set_shininess (CoglHandle handle,
float shininess)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
CoglMaterialState state = COGL_MATERIAL_STATE_LIGHTING;
CoglMaterialLightingState *lighting_state;
g_return_if_fail (cogl_is_material (handle));
if (shininess < 0.0 || shininess > 1.0)
{
g_warning ("Out of range shininess %f supplied for material\n",
shininess);
return;
}
authority = _cogl_material_get_authority (material, state);
lighting_state = &authority->big_state->lighting_state;
if (lighting_state->shininess == shininess)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
lighting_state = &material->big_state->lighting_state;
lighting_state->shininess = shininess;
_cogl_material_update_authority (material, authority, state,
_cogl_material_lighting_state_equal);
}
void
cogl_material_get_emission (CoglHandle handle,
CoglColor *emission)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LIGHTING);
cogl_color_init_from_4fv (emission,
authority->big_state->lighting_state.emission);
}
void
cogl_material_set_emission (CoglHandle handle, const CoglColor *emission)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
CoglMaterialState state = COGL_MATERIAL_STATE_LIGHTING;
CoglMaterialLightingState *lighting_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
lighting_state = &authority->big_state->lighting_state;
if (cogl_color_equal (emission, &lighting_state->emission))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
lighting_state = &material->big_state->lighting_state;
lighting_state->emission[0] = cogl_color_get_red_float (emission);
lighting_state->emission[1] = cogl_color_get_green_float (emission);
lighting_state->emission[2] = cogl_color_get_blue_float (emission);
lighting_state->emission[3] = cogl_color_get_alpha_float (emission);
_cogl_material_update_authority (material, authority, state,
_cogl_material_lighting_state_equal);
handle_automatic_blend_enable (material, state);
}
void
cogl_material_set_alpha_test_function (CoglHandle handle,
CoglMaterialAlphaFunc alpha_func,
float alpha_reference)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_ALPHA_FUNC;
CoglMaterial *authority;
CoglMaterialAlphaFuncState *alpha_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
alpha_state = &authority->big_state->alpha_state;
if (alpha_state->alpha_func == alpha_func &&
alpha_state->alpha_func_reference == alpha_reference)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
alpha_state = &material->big_state->alpha_state;
alpha_state->alpha_func = alpha_func;
alpha_state->alpha_func_reference = alpha_reference;
_cogl_material_update_authority (material, authority, state,
_cogl_material_alpha_state_equal);
}
GLenum
arg_to_gl_blend_factor (CoglBlendStringArgument *arg)
{
if (arg->source.is_zero)
return GL_ZERO;
if (arg->factor.is_one)
return GL_ONE;
else if (arg->factor.is_src_alpha_saturate)
return GL_SRC_ALPHA_SATURATE;
else if (arg->factor.source.info->type ==
COGL_BLEND_STRING_COLOR_SOURCE_SRC_COLOR)
{
if (arg->factor.source.mask != COGL_BLEND_STRING_CHANNEL_MASK_ALPHA)
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_SRC_COLOR;
else
return GL_SRC_COLOR;
}
else
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_SRC_ALPHA;
else
return GL_SRC_ALPHA;
}
}
else if (arg->factor.source.info->type ==
COGL_BLEND_STRING_COLOR_SOURCE_DST_COLOR)
{
if (arg->factor.source.mask != COGL_BLEND_STRING_CHANNEL_MASK_ALPHA)
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_DST_COLOR;
else
return GL_DST_COLOR;
}
else
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_DST_ALPHA;
else
return GL_DST_ALPHA;
}
}
#ifndef HAVE_COGL_GLES
else if (arg->factor.source.info->type ==
COGL_BLEND_STRING_COLOR_SOURCE_CONSTANT)
{
if (arg->factor.source.mask != COGL_BLEND_STRING_CHANNEL_MASK_ALPHA)
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_CONSTANT_COLOR;
else
return GL_CONSTANT_COLOR;
}
else
{
if (arg->factor.source.one_minus)
return GL_ONE_MINUS_CONSTANT_ALPHA;
else
return GL_CONSTANT_ALPHA;
}
}
#endif
g_warning ("Unable to determine valid blend factor from blend string\n");
return GL_ONE;
}
void
setup_blend_state (CoglBlendStringStatement *statement,
GLenum *blend_equation,
GLint *blend_src_factor,
GLint *blend_dst_factor)
{
#ifndef HAVE_COGL_GLES
switch (statement->function->type)
{
case COGL_BLEND_STRING_FUNCTION_ADD:
*blend_equation = GL_FUNC_ADD;
break;
/* TODO - add more */
default:
g_warning ("Unsupported blend function given");
*blend_equation = GL_FUNC_ADD;
}
#endif
*blend_src_factor = arg_to_gl_blend_factor (&statement->args[0]);
*blend_dst_factor = arg_to_gl_blend_factor (&statement->args[1]);
}
gboolean
cogl_material_set_blend (CoglHandle handle,
const char *blend_description,
GError **error)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_BLEND;
CoglMaterial *authority;
CoglBlendStringStatement statements[2];
CoglBlendStringStatement *rgb;
CoglBlendStringStatement *a;
GError *internal_error = NULL;
int count;
CoglMaterialBlendState *blend_state;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
count =
_cogl_blend_string_compile (blend_description,
COGL_BLEND_STRING_CONTEXT_BLENDING,
statements,
&internal_error);
if (!count)
{
if (error)
g_propagate_error (error, internal_error);
else
{
g_warning ("Cannot compile blend description: %s\n",
internal_error->message);
g_error_free (internal_error);
}
return FALSE;
}
if (count == 1)
rgb = a = statements;
else
{
rgb = &statements[0];
a = &statements[1];
}
authority =
_cogl_material_get_authority (material, state);
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
blend_state = &material->big_state->blend_state;
#ifndef HAVE_COGL_GLES
setup_blend_state (rgb,
&blend_state->blend_equation_rgb,
&blend_state->blend_src_factor_rgb,
&blend_state->blend_dst_factor_rgb);
setup_blend_state (a,
&blend_state->blend_equation_alpha,
&blend_state->blend_src_factor_alpha,
&blend_state->blend_dst_factor_alpha);
#else
setup_blend_state (rgb,
NULL,
&blend_state->blend_src_factor_rgb,
&blend_state->blend_dst_factor_rgb);
#endif
/* If we are the current authority see if we can revert to one of our
* ancestors being the authority */
if (material == authority && authority->parent != NULL)
{
CoglMaterial *old_authority =
_cogl_material_get_authority (authority->parent, state);
if (_cogl_material_blend_state_equal (authority, old_authority))
material->differences &= ~state;
}
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (material != authority)
{
material->differences |= state;
_cogl_material_prune_redundant_ancestry (material);
}
handle_automatic_blend_enable (material, state);
return TRUE;
}
void
cogl_material_set_blend_constant (CoglHandle handle,
CoglColor *constant_color)
{
#ifndef HAVE_COGL_GLES
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_BLEND;
CoglMaterial *authority;
CoglMaterialBlendState *blend_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
blend_state = &authority->big_state->blend_state;
if (cogl_color_equal (constant_color, &blend_state->blend_constant))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
blend_state = &material->big_state->blend_state;
blend_state->blend_constant = *constant_color;
_cogl_material_update_authority (material, authority, state,
_cogl_material_blend_state_equal);
handle_automatic_blend_enable (material, state);
#endif
}
/* XXX: for now we don't mind if the program has vertex shaders
* attached but if we ever make a similar API public we should only
* allow attaching of programs containing fragment shaders. Eventually
* we will have a CoglPipeline abstraction to also cover vertex
* processing.
*/
void
_cogl_material_set_user_program (CoglHandle handle,
CoglHandle program)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_USER_SHADER;
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
if (authority->big_state->user_program == program)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
if (program != COGL_INVALID_HANDLE)
_cogl_material_set_backend (material, COGL_MATERIAL_BACKEND_DEFAULT);
/* If we are the current authority see if we can revert to one of our
* ancestors being the authority */
if (material == authority && authority->parent != NULL)
{
CoglMaterial *old_authority =
_cogl_material_get_authority (authority->parent, state);
if (old_authority->big_state->user_program == program)
material->differences &= ~state;
}
else if (material != authority)
{
/* If we weren't previously the authority on this state then we
* need to extended our differences mask and so it's possible
* that some of our ancestry will now become redundant, so we
* aim to reparent ourselves if that's true... */
material->differences |= state;
_cogl_material_prune_redundant_ancestry (material);
}
if (program != COGL_INVALID_HANDLE)
cogl_handle_ref (program);
if (authority == material &&
material->big_state->user_program != COGL_INVALID_HANDLE)
cogl_handle_unref (material->big_state->user_program);
material->big_state->user_program = program;
handle_automatic_blend_enable (material, state);
}
void
cogl_material_set_depth_test_enabled (CoglHandle handle,
gboolean enable)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_DEPTH;
CoglMaterial *authority;
CoglMaterialDepthState *depth_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
depth_state = &authority->big_state->depth_state;
if (depth_state->depth_test_enabled == enable)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
material->big_state->depth_state.depth_test_enabled = enable;
_cogl_material_update_authority (material, authority, state,
_cogl_material_depth_state_equal);
}
gboolean
cogl_material_get_depth_test_enabled (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_DEPTH);
return authority->big_state->depth_state.depth_test_enabled;
}
void
cogl_material_set_depth_writing_enabled (CoglHandle handle,
gboolean enable)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_DEPTH;
CoglMaterial *authority;
CoglMaterialDepthState *depth_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
depth_state = &authority->big_state->depth_state;
if (depth_state->depth_writing_enabled == enable)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
material->big_state->depth_state.depth_writing_enabled = enable;
_cogl_material_update_authority (material, authority, state,
_cogl_material_depth_state_equal);
}
gboolean
cogl_material_get_depth_writing_enabled (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), TRUE);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_DEPTH);
return authority->big_state->depth_state.depth_writing_enabled;
}
void
cogl_material_set_depth_test_function (CoglHandle handle,
CoglDepthTestFunction function)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_DEPTH;
CoglMaterial *authority;
CoglMaterialDepthState *depth_state;
g_return_if_fail (cogl_is_material (handle));
authority = _cogl_material_get_authority (material, state);
depth_state = &authority->big_state->depth_state;
if (depth_state->depth_test_function == function)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
material->big_state->depth_state.depth_test_function = function;
_cogl_material_update_authority (material, authority, state,
_cogl_material_depth_state_equal);
}
CoglDepthTestFunction
cogl_material_get_depth_test_function (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle),
COGL_DEPTH_TEST_FUNCTION_LESS);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_DEPTH);
return authority->big_state->depth_state.depth_test_function;
}
gboolean
cogl_material_set_depth_range (CoglHandle handle,
float near_val,
float far_val,
GError **error)
{
#ifndef COGL_HAS_GLES
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialState state = COGL_MATERIAL_STATE_DEPTH;
CoglMaterial *authority;
CoglMaterialDepthState *depth_state;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
authority = _cogl_material_get_authority (material, state);
depth_state = &authority->big_state->depth_state;
if (depth_state->depth_range_near == near_val &&
depth_state->depth_range_far == far_val)
return TRUE;
/* - Flush journal primitives referencing the current state.
* - Make sure the material has no dependants so it may be modified.
* - If the material isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_material_pre_change_notify (material, state, NULL);
material->big_state->depth_state.depth_range_near = near_val;
material->big_state->depth_state.depth_range_far = far_val;
_cogl_material_update_authority (material, authority, state,
_cogl_material_depth_state_equal);
return TRUE;
#else
g_set_error (error,
COGL_ERROR,
COGL_ERROR_MISSING_FEATURE,
"glDepthRange not available on GLES 1");
return FALSE;
#endif
}
void
cogl_material_get_depth_range (CoglHandle handle,
float *near_val,
float *far_val)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_DEPTH);
*near_val = authority->big_state->depth_state.depth_range_near;
*far_val = authority->big_state->depth_state.depth_range_far;
}
unsigned long
_cogl_material_get_age (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
g_return_val_if_fail (cogl_is_material (handle), 0);
return material->age;
}
static CoglMaterialLayer *
_cogl_material_layer_copy (CoglMaterialLayer *src)
{
CoglMaterialLayer *layer = g_slice_new (CoglMaterialLayer);
int i;
cogl_handle_ref ((CoglHandle)src);
layer->_parent = src->_parent;
layer->owner = NULL;
layer->parent = src;
if (src->has_children)
src->children = g_list_prepend (src->children, layer);
else
{
src->has_children = TRUE;
src->first_child = layer;
src->children = NULL;
}
layer->has_children = FALSE;
layer->index = src->index;
layer->differences = 0;
layer->has_big_state = FALSE;
for (i = 0; i < COGL_MATERIAL_N_BACKENDS; i++)
layer->backend_priv[i] = NULL;
return _cogl_material_layer_handle_new (layer);
}
static void
_cogl_material_layer_unparent (CoglMaterialLayer *layer)
{
CoglMaterialLayer *parent = layer->parent;
if (parent == NULL)
return;
g_return_if_fail (parent->has_children);
if (parent->first_child == layer)
{
if (parent->children)
{
parent->first_child = parent->children->data;
parent->children =
g_list_delete_link (parent->children, parent->children);
}
else
parent->has_children = FALSE;
}
else
parent->children = g_list_remove (parent->children, layer);
cogl_handle_unref (parent);
}
static void
_cogl_material_layer_free (CoglMaterialLayer *layer)
{
int i;
_cogl_material_layer_unparent (layer);
/* NB: layers may be used by multiple materials which may be using
* different backends, therefore we determine which backends to
* notify based on the private state pointers for each backend...
*/
for (i = 0; i < COGL_MATERIAL_N_BACKENDS; i++)
{
if (layer->backend_priv[i] && backends[i]->free_layer_priv)
backends[i]->free_layer_priv (layer);
}
if (layer->differences & COGL_MATERIAL_LAYER_STATE_TEXTURE)
cogl_handle_unref (layer->texture);
if (layer->differences & COGL_MATERIAL_LAYER_STATE_NEEDS_BIG_STATE)
g_slice_free (CoglMaterialLayerBigState, layer->big_state);
g_slice_free (CoglMaterialLayer, layer);
}
/* If a layer has descendants we can't modify it freely
*
* If the layer is owned and the owner has descendants we can't
* modify it freely.
*
* In both cases when we can't freely modify a layer we can either:
* - create a new layer; splice it in to replace the layer so it can
* be directly modified.
* XXX: disadvantage is that we have to invalidate the layers_cache
* for the owner and its descendants.
* - create a new derived layer and modify that.
*/
/* XXX: how is the caller expected to deal with ref-counting?
*
* If the layer can't be freely modified and we return a new layer
* then that will effectively make the caller own a new reference
* which doesn't happen if we simply modify the given layer.
*
* We could make it consistent by taking a reference on the layer if
* we don't create a new one. At least this way the caller could
* deal with it consistently, though the semantics are a bit
* strange.
*
* Alternatively we could leave it to the caller to check
* ...?
*/
void
_cogl_material_init_default_layers (void)
{
CoglMaterialLayer *layer = g_slice_new0 (CoglMaterialLayer);
CoglMaterialLayerBigState *big_state =
g_slice_new0 (CoglMaterialLayerBigState);
CoglMaterialLayer *new;
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
layer->has_children = FALSE;
layer->index = 0;
for (i = 0; i < COGL_MATERIAL_N_BACKENDS; i++)
layer->backend_priv[i] = NULL;
layer->differences = COGL_MATERIAL_LAYER_STATE_ALL_SPARSE;
layer->unit_index = 0;
layer->texture = COGL_INVALID_HANDLE;
layer->texture_overridden = FALSE;
layer->mag_filter = COGL_MATERIAL_FILTER_LINEAR;
layer->min_filter = COGL_MATERIAL_FILTER_LINEAR;
layer->wrap_mode_s = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->wrap_mode_t = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->wrap_mode_r = COGL_MATERIAL_WRAP_MODE_AUTOMATIC;
layer->big_state = big_state;
layer->has_big_state = TRUE;
/* Choose the same default combine mode as OpenGL:
* RGBA = MODULATE(PREVIOUS[RGBA],TEXTURE[RGBA]) */
big_state->texture_combine_rgb_func = GL_MODULATE;
big_state->texture_combine_rgb_src[0] = GL_PREVIOUS;
big_state->texture_combine_rgb_src[1] = GL_TEXTURE;
big_state->texture_combine_rgb_op[0] = GL_SRC_COLOR;
big_state->texture_combine_rgb_op[1] = GL_SRC_COLOR;
big_state->texture_combine_alpha_func = GL_MODULATE;
big_state->texture_combine_alpha_src[0] = GL_PREVIOUS;
big_state->texture_combine_alpha_src[1] = GL_TEXTURE;
big_state->texture_combine_alpha_op[0] = GL_SRC_ALPHA;
big_state->texture_combine_alpha_op[1] = GL_SRC_ALPHA;
cogl_matrix_init_identity (&big_state->matrix);
ctx->default_layer_0 = _cogl_material_layer_handle_new (layer);
/* TODO: we should make default_layer_n comprise of two
* descendants of default_layer_0:
* - the first descendant should change the texture combine
* to what we expect is most commonly used for multitexturing
* - the second should revert the above change.
*
* why? the documentation for how a new layer is initialized
* doesn't say that layers > 0 have different defaults so unless
* we change the documentation we can't use different defaults,
* but if the user does what we expect and changes the
* texture combine then we can revert the authority to the
* first descendant which means we can maximize the number
* of layers with a common ancestor.
*
* The main problem will be that we'll need to disable the
* optimizations for flattening the ancestry when we make
* the second descendant which reverts the state.
*/
ctx->default_layer_n = _cogl_material_layer_copy (layer);
new = _cogl_material_set_layer_unit (NULL, ctx->default_layer_n, 1);
g_assert (new == ctx->default_layer_n);
/* Since we passed a newly allocated layer we don't expect that
* _set_layer_unit() will have to allocate *another* layer. */
/* Finally we create a dummy dependant for ->default_layer_n which
* effectively ensures that ->default_layer_n and ->default_layer_0
* remain immutable.
*/
ctx->dummy_layer_dependant =
_cogl_material_layer_copy (ctx->default_layer_n);
}
static void
setup_texture_combine_state (CoglBlendStringStatement *statement,
GLint *texture_combine_func,
GLint *texture_combine_src,
GLint *texture_combine_op)
{
int i;
switch (statement->function->type)
{
case COGL_BLEND_STRING_FUNCTION_REPLACE:
*texture_combine_func = GL_REPLACE;
break;
case COGL_BLEND_STRING_FUNCTION_MODULATE:
*texture_combine_func = GL_MODULATE;
break;
case COGL_BLEND_STRING_FUNCTION_ADD:
*texture_combine_func = GL_ADD;
break;
case COGL_BLEND_STRING_FUNCTION_ADD_SIGNED:
*texture_combine_func = GL_ADD_SIGNED;
break;
case COGL_BLEND_STRING_FUNCTION_INTERPOLATE:
*texture_combine_func = GL_INTERPOLATE;
break;
case COGL_BLEND_STRING_FUNCTION_SUBTRACT:
*texture_combine_func = GL_SUBTRACT;
break;
case COGL_BLEND_STRING_FUNCTION_DOT3_RGB:
*texture_combine_func = GL_DOT3_RGB;
break;
case COGL_BLEND_STRING_FUNCTION_DOT3_RGBA:
*texture_combine_func = GL_DOT3_RGBA;
break;
}
for (i = 0; i < statement->function->argc; i++)
{
CoglBlendStringArgument *arg = &statement->args[i];
switch (arg->source.info->type)
{
case COGL_BLEND_STRING_COLOR_SOURCE_CONSTANT:
texture_combine_src[i] = GL_CONSTANT;
break;
case COGL_BLEND_STRING_COLOR_SOURCE_TEXTURE:
texture_combine_src[i] = GL_TEXTURE;
break;
case COGL_BLEND_STRING_COLOR_SOURCE_TEXTURE_N:
texture_combine_src[i] =
GL_TEXTURE0 + arg->source.texture;
break;
case COGL_BLEND_STRING_COLOR_SOURCE_PRIMARY:
texture_combine_src[i] = GL_PRIMARY_COLOR;
break;
case COGL_BLEND_STRING_COLOR_SOURCE_PREVIOUS:
texture_combine_src[i] = GL_PREVIOUS;
break;
default:
g_warning ("Unexpected texture combine source");
texture_combine_src[i] = GL_TEXTURE;
}
if (arg->source.mask == COGL_BLEND_STRING_CHANNEL_MASK_RGB)
{
if (statement->args[i].source.one_minus)
texture_combine_op[i] = GL_ONE_MINUS_SRC_COLOR;
else
texture_combine_op[i] = GL_SRC_COLOR;
}
else
{
if (statement->args[i].source.one_minus)
texture_combine_op[i] = GL_ONE_MINUS_SRC_ALPHA;
else
texture_combine_op[i] = GL_SRC_ALPHA;
}
}
}
gboolean
cogl_material_set_layer_combine (CoglHandle handle,
int layer_index,
const char *combine_description,
GError **error)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState state = COGL_MATERIAL_LAYER_STATE_COMBINE;
CoglMaterialLayer *authority;
CoglMaterialLayer *layer;
CoglBlendStringStatement statements[2];
CoglBlendStringStatement split[2];
CoglBlendStringStatement *rgb;
CoglBlendStringStatement *a;
GError *internal_error = NULL;
int count;
g_return_val_if_fail (cogl_is_material (handle), FALSE);
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, state);
count =
_cogl_blend_string_compile (combine_description,
COGL_BLEND_STRING_CONTEXT_TEXTURE_COMBINE,
statements,
&internal_error);
if (!count)
{
if (error)
g_propagate_error (error, internal_error);
else
{
g_warning ("Cannot compile combine description: %s\n",
internal_error->message);
g_error_free (internal_error);
}
return FALSE;
}
if (statements[0].mask == COGL_BLEND_STRING_CHANNEL_MASK_RGBA)
{
_cogl_blend_string_split_rgba_statement (statements,
&split[0], &split[1]);
rgb = &split[0];
a = &split[1];
}
else
{
rgb = &statements[0];
a = &statements[1];
}
/* FIXME: compare the new state with the current state! */
/* possibly flush primitives referencing the current state... */
layer = _cogl_material_layer_pre_change_notify (material, layer, state);
setup_texture_combine_state (rgb,
&layer->big_state->texture_combine_rgb_func,
layer->big_state->texture_combine_rgb_src,
layer->big_state->texture_combine_rgb_op);
setup_texture_combine_state (a,
&layer->big_state->texture_combine_alpha_func,
layer->big_state->texture_combine_alpha_src,
layer->big_state->texture_combine_alpha_op);
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, state);
if (_cogl_material_layer_combine_state_equal (authority,
old_authority))
{
layer->differences &= ~state;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
goto changed;
}
}
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= state;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
changed:
handle_automatic_blend_enable (material, COGL_MATERIAL_STATE_LAYERS);
return TRUE;
}
void
cogl_material_set_layer_combine_constant (CoglHandle handle,
int layer_index,
CoglColor *constant_color)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState state = COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialLayer *new;
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, state);
if (memcmp (authority->big_state->texture_combine_constant,
constant_color, sizeof (float) * 4) == 0)
return;
new = _cogl_material_layer_pre_change_notify (material, layer, state);
if (new != layer)
layer = new;
else
{
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, state);
CoglMaterialLayerBigState *old_big_state = old_authority->big_state;
if (memcmp (old_big_state->texture_combine_constant,
constant_color, sizeof (float) * 4) == 0)
{
layer->differences &= ~state;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
goto changed;
}
}
}
layer->big_state->texture_combine_constant[0] =
cogl_color_get_red_float (constant_color);
layer->big_state->texture_combine_constant[1] =
cogl_color_get_green_float (constant_color);
layer->big_state->texture_combine_constant[2] =
cogl_color_get_blue_float (constant_color);
layer->big_state->texture_combine_constant[3] =
cogl_color_get_alpha_float (constant_color);
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= state;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
changed:
handle_automatic_blend_enable (material, COGL_MATERIAL_STATE_LAYERS);
}
void
cogl_material_set_layer_matrix (CoglHandle handle,
int layer_index,
CoglMatrix *matrix)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState state = COGL_MATERIAL_LAYER_STATE_USER_MATRIX;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialLayer *new;
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, state);
if (cogl_matrix_equal (matrix, &authority->big_state->matrix))
return;
new = _cogl_material_layer_pre_change_notify (material, layer, state);
if (new != layer)
layer = new;
else
{
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, state);
if (cogl_matrix_equal (matrix, &old_authority->big_state->matrix))
{
layer->differences &= ~state;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
return;
}
}
}
layer->big_state->matrix = *matrix;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= state;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
}
void
cogl_material_remove_layer (CoglHandle handle, int layer_index)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
CoglMaterialLayerInfo layer_info;
int i;
g_return_if_fail (cogl_is_material (handle));
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LAYERS);
/* The layer index of the layer we want info about */
layer_info.layer_index = layer_index;
/* This will be updated with a reference to the layer being removed
* if it can be found. */
layer_info.layer = NULL;
/* This will be filled in with a list of layers that need to be
* dropped down to a lower texture unit to fill the gap of the
* removed layer. */
layer_info.layers_to_shift =
g_alloca (sizeof (CoglMaterialLayer *) * authority->n_layers);
layer_info.n_layers_to_shift = 0;
/* Unlike when we query layer info when adding a layer we must
* always have a complete layers_to_shift list... */
layer_info.ignore_shift_layers_if_found = FALSE;
_cogl_material_get_layer_info (authority, &layer_info);
if (layer_info.layer == NULL)
return;
for (i = 0; i < layer_info.n_layers_to_shift; i++)
{
CoglMaterialLayer *shift_layer = layer_info.layers_to_shift[i];
int unit_index = _cogl_material_layer_get_unit_index (shift_layer);
_cogl_material_set_layer_unit (material, shift_layer, unit_index - 1);
/* NB: shift_layer may not be writeable so _set_layer_unit()
* will allocate a derived layer internally which will become
* owned by material. Check the return value if we need to do
* anything else with this layer. */
}
_cogl_material_remove_layer_difference (material, layer_info.layer, TRUE);
_cogl_material_try_reverting_layers_authority (material, NULL);
handle_automatic_blend_enable (material, COGL_MATERIAL_STATE_LAYERS);
}
static gboolean
prepend_layer_to_list_cb (CoglMaterialLayer *layer,
void *user_data)
{
GList **layers = user_data;
*layers = g_list_prepend (*layers, layer);
return TRUE;
}
/* TODO: deprecate this API and replace it with
* cogl_material_foreach_layer
* TODO: update the docs to note that if the user modifies any layers
* then the list may become invalid.
*/
const GList *
cogl_material_get_layers (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
g_return_val_if_fail (cogl_is_material (handle), NULL);
if (!material->deprecated_get_layers_list_dirty)
g_list_free (material->deprecated_get_layers_list);
material->deprecated_get_layers_list = NULL;
_cogl_material_foreach_layer (material,
prepend_layer_to_list_cb,
&material->deprecated_get_layers_list);
material->deprecated_get_layers_list =
g_list_reverse (material->deprecated_get_layers_list);
material->deprecated_get_layers_list_dirty = 0;
return material->deprecated_get_layers_list;
}
int
cogl_material_get_n_layers (CoglHandle handle)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterial *authority;
g_return_val_if_fail (cogl_is_material (handle), 0);
authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LAYERS);
return authority->n_layers;
}
/* FIXME: deprecate and replace with
* cogl_material_get_layer_type() instead. */
CoglMaterialLayerType
cogl_material_layer_get_type (CoglHandle layer_handle)
{
return COGL_MATERIAL_LAYER_TYPE_TEXTURE;
}
/* FIXME: deprecate and replace with
* cogl_material_get_layer_texture() instead. */
CoglHandle
cogl_material_layer_get_texture (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
g_return_val_if_fail (cogl_is_material_layer (handle),
COGL_INVALID_HANDLE);
return _cogl_material_layer_get_texture (layer);
}
gboolean
_cogl_material_layer_has_user_matrix (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayer *authority;
g_return_val_if_fail (cogl_is_material_layer (handle), FALSE);
authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_USER_MATRIX);
/* If the authority is the default material then no, otherwise yes */
return authority->parent ? TRUE : FALSE;
}
static void
_cogl_material_layer_get_filters (CoglMaterialLayer *layer,
CoglMaterialFilter *min_filter,
CoglMaterialFilter *mag_filter)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_FILTERS);
*min_filter = authority->min_filter;
*mag_filter = authority->mag_filter;
}
void
_cogl_material_layer_pre_paint (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayer *texture_authority;
texture_authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_TEXTURE);
if (texture_authority->texture != COGL_INVALID_HANDLE)
{
CoglTexturePrePaintFlags flags = 0;
CoglMaterialFilter min_filter;
CoglMaterialFilter mag_filter;
_cogl_material_layer_get_filters (layer, &min_filter, &mag_filter);
if (min_filter == COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST
|| min_filter == COGL_MATERIAL_FILTER_LINEAR_MIPMAP_NEAREST
|| min_filter == COGL_MATERIAL_FILTER_NEAREST_MIPMAP_LINEAR
|| min_filter == COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR)
flags |= COGL_TEXTURE_NEEDS_MIPMAP;
_cogl_texture_pre_paint (layer->texture, flags);
}
}
CoglMaterialFilter
cogl_material_layer_get_min_filter (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayer *authority;
g_return_val_if_fail (cogl_is_material_layer (handle), 0);
authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_FILTERS);
return authority->min_filter;
}
CoglMaterialFilter
cogl_material_layer_get_mag_filter (CoglHandle handle)
{
CoglMaterialLayer *layer = COGL_MATERIAL_LAYER (handle);
CoglMaterialLayer *authority;
g_return_val_if_fail (cogl_is_material_layer (handle), 0);
authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_FILTERS);
return authority->mag_filter;
}
void
cogl_material_set_layer_filters (CoglHandle handle,
int layer_index,
CoglMaterialFilter min_filter,
CoglMaterialFilter mag_filter)
{
CoglMaterial *material = COGL_MATERIAL (handle);
CoglMaterialLayerState change = COGL_MATERIAL_LAYER_STATE_FILTERS;
CoglMaterialLayer *layer;
CoglMaterialLayer *authority;
CoglMaterialLayer *new;
g_return_if_fail (cogl_is_material (handle));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* material. If the layer is created then it will be owned by
* material. */
layer = _cogl_material_get_layer (material, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_material_layer_get_authority (layer, change);
if (authority->min_filter == min_filter &&
authority->mag_filter == mag_filter)
return;
new = _cogl_material_layer_pre_change_notify (material, layer, change);
if (new != layer)
layer = new;
else
{
/* If the original layer we found is currently the authority on
* the state we are changing see if we can revert to one of our
* ancestors being the authority. */
if (layer == authority && authority->parent != NULL)
{
CoglMaterialLayer *old_authority =
_cogl_material_layer_get_authority (authority->parent, change);
if (old_authority->min_filter == min_filter &&
old_authority->mag_filter == mag_filter)
{
layer->differences &= ~change;
g_assert (layer->owner == material);
if (layer->differences == 0)
_cogl_material_prune_empty_layer_difference (material,
layer);
return;
}
}
}
layer->min_filter = min_filter;
layer->mag_filter = mag_filter;
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= change;
_cogl_material_layer_prune_redundant_ancestry (layer);
}
}
static void
disable_texture_unit (int unit_index)
{
CoglTextureUnit *unit;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
unit = &g_array_index (ctx->texture_units, CoglTextureUnit, unit_index);
if (unit->enabled)
{
set_active_texture_unit (unit_index);
GE (glDisable (unit->current_gl_target));
unit->enabled = FALSE;
}
}
void
_cogl_gl_use_program_wrapper (GLuint program)
{
#ifdef COGL_MATERIAL_BACKEND_GLSL
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->current_gl_program == program)
return;
if (program)
{
GLenum gl_error;
while ((gl_error = glGetError ()) != GL_NO_ERROR)
;
glUseProgram (program);
if (glGetError () != GL_NO_ERROR)
{
GE (glUseProgram (0));
ctx->current_gl_program = 0;
return;
}
}
else
GE (glUseProgram (0));
ctx->current_gl_program = program;
#endif
}
static void
disable_glsl (void)
{
#ifdef COGL_MATERIAL_BACKEND_GLSL
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->current_use_program_type == COGL_MATERIAL_PROGRAM_TYPE_GLSL)
_cogl_gl_use_program_wrapper (0);
#endif
}
static void
disable_arbfp (void)
{
#ifdef COGL_MATERIAL_BACKEND_ARBFP
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->current_use_program_type == COGL_MATERIAL_PROGRAM_TYPE_ARBFP)
GE (glDisable (GL_FRAGMENT_PROGRAM_ARB));
#endif
}
static void
use_program (CoglHandle program_handle, CoglMaterialProgramType type)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
switch (type)
{
#ifdef COGL_MATERIAL_BACKEND_GLSL
case COGL_MATERIAL_PROGRAM_TYPE_GLSL:
{
/* The GLES2 backend currently manages its own codegen for
* fixed function API fallbacks and manages its own shader
* state. */
#ifndef HAVE_COGL_GLES2
CoglProgram *program =
_cogl_program_pointer_from_handle (program_handle);
_cogl_gl_use_program_wrapper (program->gl_handle);
disable_arbfp ();
#endif
ctx->current_use_program_type = type;
break;
}
#else
case COGL_MATERIAL_PROGRAM_TYPE_GLSL:
g_warning ("Unexpected use of GLSL backend!");
break;
#endif
#ifdef COGL_MATERIAL_BACKEND_ARBFP
case COGL_MATERIAL_PROGRAM_TYPE_ARBFP:
/* _cogl_gl_use_program_wrapper can be called by cogl-program.c
* so we can't bailout without making sure we glUseProgram (0)
* first. */
disable_glsl ();
if (ctx->current_use_program_type == COGL_MATERIAL_PROGRAM_TYPE_ARBFP)
break;
GE (glEnable (GL_FRAGMENT_PROGRAM_ARB));
ctx->current_use_program_type = type;
break;
#else
case COGL_MATERIAL_PROGRAM_TYPE_ARBFP:
g_warning ("Unexpected use of GLSL backend!");
break;
#endif
#ifdef COGL_MATERIAL_BACKEND_FIXED
case COGL_MATERIAL_PROGRAM_TYPE_FIXED:
/* _cogl_gl_use_program_wrapper can be called by cogl-program.c
* so we can't bailout without making sure we glUseProgram (0)
* first. */
disable_glsl ();
if (ctx->current_use_program_type == COGL_MATERIAL_PROGRAM_TYPE_FIXED)
break;
disable_arbfp ();
ctx->current_use_program_type = type;
#endif
}
}
#if defined (COGL_MATERIAL_BACKEND_GLSL) || \
defined (COGL_MATERIAL_BACKEND_ARBFP)
static int
get_max_texture_image_units (void)
{
_COGL_GET_CONTEXT (ctx, 0);
/* This function is called quite often so we cache the value to
avoid too many GL calls */
if (G_UNLIKELY (ctx->max_texture_image_units == -1))
{
ctx->max_texture_image_units = 1;
GE (glGetIntegerv (GL_MAX_TEXTURE_IMAGE_UNITS,
&ctx->max_texture_image_units));
}
return ctx->max_texture_image_units;
}
#endif
#ifdef COGL_MATERIAL_BACKEND_GLSL
static int
_cogl_material_backend_glsl_get_max_texture_units (void)
{
return get_max_texture_image_units ();
}
static gboolean
_cogl_material_backend_glsl_start (CoglMaterial *material,
int n_layers,
unsigned long materials_difference)
{
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_features_available (COGL_FEATURE_SHADERS_GLSL))
return FALSE;
/* FIXME: This will likely conflict with the GLES 2 backends use of
* glUseProgram.
*/
if (materials_difference & COGL_MATERIAL_STATE_USER_SHADER)
{
CoglMaterial *authority =
_cogl_material_get_authority (material,
COGL_MATERIAL_STATE_USER_SHADER);
CoglHandle program = authority->big_state->user_program;
if (program == COGL_INVALID_HANDLE)
return FALSE; /* XXX: change me when we support code generation here */
use_program (program, COGL_MATERIAL_PROGRAM_TYPE_GLSL);
return TRUE;
}
/* TODO: also support code generation */
return FALSE;
}
gboolean
_cogl_material_backend_glsl_add_layer (CoglMaterial *material,
CoglMaterialLayer *layer,
unsigned long layers_difference)
{
return TRUE;
}
gboolean
_cogl_material_backend_glsl_passthrough (CoglMaterial *material)
{
return TRUE;
}
gboolean
_cogl_material_backend_glsl_end (CoglMaterial *material,
unsigned long materials_difference)
{
return TRUE;
}
static const CoglMaterialBackend _cogl_material_glsl_backend =
{
_cogl_material_backend_glsl_get_max_texture_units,
_cogl_material_backend_glsl_start,
_cogl_material_backend_glsl_add_layer,
_cogl_material_backend_glsl_passthrough,
_cogl_material_backend_glsl_end,
NULL, /* material_state_change_notify */
NULL, /* material_set_parent_notify */
NULL, /* layer_state_change_notify */
NULL, /* free_priv */
};
#endif /* COGL_MATERIAL_BACKEND_GLSL */
#ifdef COGL_MATERIAL_BACKEND_ARBFP
static int
_cogl_material_backend_arbfp_get_max_texture_units (void)
{
return get_max_texture_image_units ();
}
typedef struct
{
int i;
CoglMaterialLayer **layers;
} AddLayersToArrayState;
static gboolean
add_layer_to_array_cb (CoglMaterialLayer *layer,
void *user_data)
{
AddLayersToArrayState *state = user_data;
state->layers[state->i++] = layer;
return TRUE;
}
static gboolean
layers_arbfp_would_differ (CoglMaterialLayer **material0_layers,
CoglMaterialLayer **material1_layers,
int n_layers)
{
int i;
/* The layer state that affects arbfp codegen... */
unsigned long arbfp_codegen_modifiers =
COGL_MATERIAL_LAYER_STATE_COMBINE |
COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT |
COGL_MATERIAL_LAYER_STATE_UNIT |
COGL_MATERIAL_LAYER_STATE_TEXTURE;
for (i = 0; i < n_layers; i++)
{
CoglMaterialLayer *layer0 = material0_layers[i];
CoglMaterialLayer *layer1 = material1_layers[i];
unsigned long layer_differences;
if (layer0 == layer1)
continue;
layer_differences =
_cogl_material_layer_compare_differences (layer0, layer1);
if (layer_differences & arbfp_codegen_modifiers)
{
/* When it comes to texture differences the only thing that
* affects the arbfp is the target enum... */
if (layer_differences == COGL_MATERIAL_LAYER_STATE_TEXTURE)
{
CoglHandle tex0 = _cogl_material_layer_get_texture (layer0);
CoglHandle tex1 = _cogl_material_layer_get_texture (layer1);
GLenum gl_target0;
GLenum gl_target1;
cogl_texture_get_gl_texture (tex0, NULL, &gl_target0);
cogl_texture_get_gl_texture (tex1, NULL, &gl_target1);
if (gl_target0 == gl_target1)
continue;
}
return TRUE;
}
}
return FALSE;
}
/* This tries to find the oldest ancestor whos state would generate
* the same arbfp program as the current material. This is a simple
* mechanism for reducing the number of arbfp programs we have to
* generate.
*/
static CoglMaterial *
find_arbfp_authority (CoglMaterial *material)
{
CoglMaterial *authority0;
CoglMaterial *authority1;
int n_layers;
CoglMaterialLayer **authority0_layers;
CoglMaterialLayer **authority1_layers;
/* XXX: we'll need to update this when we add fog support to the
* arbfp codegen */
/* Find the first material that modifies state that affects the
* arbfp codegen... */
authority0 = _cogl_material_get_authority (material,
COGL_MATERIAL_STATE_LAYERS);
/* Find the next ancestor after that, that also modifies state
* affecting arbfp codegen... */
if (authority0->parent)
authority1 = _cogl_material_get_authority (authority0->parent,
COGL_MATERIAL_STATE_LAYERS);
else
return authority0;
n_layers = authority0->n_layers;
for (;;)
{
AddLayersToArrayState state;
if (authority0->n_layers != authority1->n_layers)
return authority0;
authority0_layers =
g_alloca (sizeof (CoglMaterialLayer *) * n_layers);
state.i = 0;
state.layers = authority0_layers;
_cogl_material_foreach_layer (authority0,
add_layer_to_array_cb,
&state);
authority1_layers =
g_alloca (sizeof (CoglMaterialLayer *) * n_layers);
state.i = 0;
state.layers = authority1_layers;
_cogl_material_foreach_layer (authority1,
add_layer_to_array_cb,
&state);
if (layers_arbfp_would_differ (authority0_layers, authority1_layers,
n_layers))
return authority0;
/* Find the next ancestor after that, that also modifies state
* affecting arbfp codegen... */
if (!authority1->parent)
break;
authority0 = authority1;
authority1 = _cogl_material_get_authority (authority1->parent,
COGL_MATERIAL_STATE_LAYERS);
if (authority1 == authority0)
break;
}
return authority1;
}
static void
invalidate_arbfp_authority_cache (CoglMaterial *material)
{
if (material->backend_priv_set_mask & COGL_MATERIAL_BACKEND_ARBFP_MASK)
{
CoglMaterialBackendARBfpPrivate *priv =
material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
priv->authority_cache = NULL;
priv->authority_cache_age = 0;
}
}
static gboolean
_cogl_material_backend_arbfp_start (CoglMaterial *material,
int n_layers,
unsigned long materials_difference)
{
CoglMaterial *authority;
CoglMaterialBackendARBfpPrivate *priv;
CoglMaterialBackendARBfpPrivate *authority_priv;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!_cogl_features_available_private (COGL_FEATURE_PRIVATE_ARB_FP))
return FALSE;
/* TODO: support fog */
if (ctx->fog_enabled)
return FALSE;
/* Note: we allocate ARBfp private state for both the given material
* and the authority. (The oldest ancestor whos state will result in
* the same program being generated) The former will simply cache a
* pointer to the authority and the later will track the arbfp
* program that we will generate.
*/
if (!(material->backend_priv_set_mask & COGL_MATERIAL_BACKEND_ARBFP_MASK))
{
material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP] =
g_slice_new0 (CoglMaterialBackendARBfpPrivate);
material->backend_priv_set_mask |= COGL_MATERIAL_BACKEND_ARBFP_MASK;
}
priv = material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
/* XXX: We are making assumptions that we don't yet support
* modification of ancestors to optimize the sharing of state in the
* material graph. When we start to support this then the arbfp
* backend will somehow need to be notified of graph changes that
* may invalidate authority_cache pointers.
*/
if (priv->authority_cache &&
priv->authority_cache_age != _cogl_material_get_age (material))
invalidate_arbfp_authority_cache (material);
if (!priv->authority_cache)
{
priv->authority_cache = find_arbfp_authority (material);
priv->authority_cache_age = _cogl_material_get_age (material);
}
authority = priv->authority_cache;
if (!(authority->backend_priv_set_mask & COGL_MATERIAL_BACKEND_ARBFP_MASK))
{
authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP] =
g_slice_new0 (CoglMaterialBackendARBfpPrivate);
authority->backend_priv_set_mask |= COGL_MATERIAL_BACKEND_ARBFP_MASK;
}
authority_priv = authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
if (authority_priv->gl_program == 0)
{
/* We reuse a single grow-only GString for ARBfp code-gen */
g_string_set_size (ctx->arbfp_source_buffer, 0);
authority_priv->source = ctx->arbfp_source_buffer;
g_string_append (authority_priv->source,
"!!ARBfp1.0\n"
"TEMP output;\n"
"TEMP tmp0, tmp1, tmp2, tmp3, tmp4;\n"
"PARAM half = {.5, .5, .5, .5};\n"
"PARAM one = {1, 1, 1, 1};\n"
"PARAM two = {2, 2, 2, 2};\n"
"PARAM minus_one = {-1, -1, -1, -1};\n");
authority_priv->sampled = g_new0 (gboolean, n_layers);
}
return TRUE;
}
static CoglMaterial *
get_arbfp_authority (CoglMaterial *material)
{
CoglMaterialBackendARBfpPrivate *priv =
material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
g_return_val_if_fail (priv != NULL, NULL);
return priv->authority_cache;
}
/* Determines if we need to handle the RGB and A texture combining
* separately or is the same function used for both channel masks and
* with the same arguments...
*/
static gboolean
need_texture_combine_separate (CoglMaterialLayer *combine_authority)
{
CoglMaterialLayerBigState *big_state = combine_authority->big_state;
int n_args;
int i;
if (big_state->texture_combine_rgb_func !=
big_state->texture_combine_alpha_func)
return TRUE;
n_args = get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
for (i = 0; i < n_args; i++)
{
if (big_state->texture_combine_rgb_src[i] !=
big_state->texture_combine_alpha_src[i])
return TRUE;
/*
* We can allow some variation of the source operands without
* needing a separation...
*
* "A = REPLACE (CONSTANT[A])" + either of the following...
* "RGB = REPLACE (CONSTANT[RGB])"
* "RGB = REPLACE (CONSTANT[A])"
*
* can be combined as:
* "RGBA = REPLACE (CONSTANT)" or
* "RGBA = REPLACE (CONSTANT[A])" or
*
* And "A = REPLACE (1-CONSTANT[A])" + either of the following...
* "RGB = REPLACE (1-CONSTANT)" or
* "RGB = REPLACE (1-CONSTANT[A])"
*
* can be combined as:
* "RGBA = REPLACE (1-CONSTANT)" or
* "RGBA = REPLACE (1-CONSTANT[A])"
*/
switch (big_state->texture_combine_alpha_op[i])
{
case GL_SRC_ALPHA:
switch (big_state->texture_combine_rgb_op[i])
{
case GL_SRC_COLOR:
case GL_SRC_ALPHA:
break;
default:
return FALSE;
}
break;
case GL_ONE_MINUS_SRC_ALPHA:
switch (big_state->texture_combine_rgb_op[i])
{
case GL_ONE_MINUS_SRC_COLOR:
case GL_ONE_MINUS_SRC_ALPHA:
break;
default:
return FALSE;
}
break;
default:
return FALSE; /* impossible */
}
}
return FALSE;
}
static const char *
gl_target_to_arbfp_string (GLenum gl_target)
{
#ifndef HAVE_COGL_GLES2
if (gl_target == GL_TEXTURE_1D)
return "1D";
else
#endif
if (gl_target == GL_TEXTURE_2D)
return "2D";
#ifdef GL_ARB_texture_rectangle
else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
return "RECT";
#endif
else
return "2D";
}
static void
setup_texture_source (CoglMaterialBackendARBfpPrivate *priv,
int unit_index,
GLenum gl_target)
{
if (!priv->sampled[unit_index])
{
g_string_append_printf (priv->source,
"TEMP texel%d;\n"
"TEX texel%d,fragment.texcoord[%d],"
"texture[%d],%s;\n",
unit_index,
unit_index,
unit_index,
unit_index,
gl_target_to_arbfp_string (gl_target));
priv->sampled[unit_index] = TRUE;
}
}
typedef enum _CoglMaterialBackendARBfpArgType
{
COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE,
COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_CONSTANT,
COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_TEXTURE
} CoglMaterialBackendARBfpArgType;
typedef struct _CoglMaterialBackendARBfpArg
{
const char *name;
CoglMaterialBackendARBfpArgType type;
/* for type = TEXTURE */
int texture_unit;
GLenum texture_target;
/* for type = CONSTANT */
int constant_id;
const char *swizzle;
} CoglMaterialBackendARBfpArg;
static void
append_arg (GString *source, const CoglMaterialBackendARBfpArg *arg)
{
switch (arg->type)
{
case COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_TEXTURE:
g_string_append_printf (source, "texel%d%s",
arg->texture_unit, arg->swizzle);
break;
case COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_CONSTANT:
g_string_append_printf (source, "constant%d%s",
arg->constant_id, arg->swizzle);
break;
case COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE:
g_string_append_printf (source, "%s%s",
arg->name, arg->swizzle);
break;
}
}
/* Note: we are trying to avoid duplicating strings during codegen
* which is why we have the slightly awkward
* CoglMaterialBackendARBfpArg mechanism. */
static void
setup_arg (CoglMaterial *material,
CoglMaterialLayer *layer,
CoglBlendStringChannelMask mask,
int arg_index,
GLint src,
GLint op,
CoglMaterialBackendARBfpArg *arg)
{
CoglMaterial *arbfp_authority = get_arbfp_authority (material);
CoglMaterialBackendARBfpPrivate *priv =
arbfp_authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
static const char *tmp_name[3] = { "tmp0", "tmp1", "tmp2" };
GLenum gl_target;
CoglHandle texture;
switch (src)
{
case GL_TEXTURE:
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_TEXTURE;
arg->name = "texel%d";
arg->texture_unit = _cogl_material_layer_get_unit_index (layer);
texture = _cogl_material_layer_get_texture (layer);
cogl_texture_get_gl_texture (texture, NULL, &gl_target);
setup_texture_source (priv, arg->texture_unit, gl_target);
break;
case GL_CONSTANT:
{
unsigned long state = COGL_MATERIAL_LAYER_STATE_COMBINE_CONSTANT;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, state);
CoglMaterialLayerBigState *big_state = authority->big_state;
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_CONSTANT;
arg->name = "constant%d";
arg->constant_id = priv->next_constant_id++;
g_string_append_printf (priv->source,
"PARAM constant%d = "
" {%f, %f, %f, %f};\n",
arg->constant_id,
big_state->texture_combine_constant[0],
big_state->texture_combine_constant[1],
big_state->texture_combine_constant[2],
big_state->texture_combine_constant[3]);
break;
}
case GL_PRIMARY_COLOR:
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE;
arg->name = "fragment.color.primary";
break;
case GL_PREVIOUS:
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE;
if (_cogl_material_layer_get_unit_index (layer) == 0)
arg->name = "fragment.color.primary";
else
arg->name = "output";
break;
default: /* GL_TEXTURE0..N */
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_TEXTURE;
arg->name = "texture[%d]";
arg->texture_unit = src - GL_TEXTURE0;
texture = _cogl_material_layer_get_texture (layer);
cogl_texture_get_gl_texture (texture, NULL, &gl_target);
setup_texture_source (priv, arg->texture_unit, gl_target);
}
arg->swizzle = "";
switch (op)
{
case GL_SRC_COLOR:
break;
case GL_ONE_MINUS_SRC_COLOR:
g_string_append_printf (priv->source,
"SUB tmp%d, one, ",
arg_index);
append_arg (priv->source, arg);
g_string_append_printf (priv->source, ";\n");
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE;
arg->name = tmp_name[arg_index];
arg->swizzle = "";
break;
case GL_SRC_ALPHA:
/* avoid a swizzle if we know RGB are going to be masked
* in the end anyway */
if (mask != COGL_BLEND_STRING_CHANNEL_MASK_ALPHA)
arg->swizzle = ".a";
break;
case GL_ONE_MINUS_SRC_ALPHA:
g_string_append_printf (priv->source,
"SUB tmp%d, one, ",
arg_index);
append_arg (priv->source, arg);
/* avoid a swizzle if we know RGB are going to be masked
* in the end anyway */
if (mask != COGL_BLEND_STRING_CHANNEL_MASK_ALPHA)
g_string_append_printf (priv->source, ".a;\n");
else
g_string_append_printf (priv->source, ";\n");
arg->type = COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_SIMPLE;
arg->name = tmp_name[arg_index];
break;
default:
g_error ("Unknown texture combine operator %d", op);
break;
}
}
static gboolean
backend_arbfp_args_equal (CoglMaterialBackendARBfpArg *arg0,
CoglMaterialBackendARBfpArg *arg1)
{
if (arg0->type != arg1->type)
return FALSE;
if (arg0->name != arg1->name &&
strcmp (arg0->name, arg1->name) != 0)
return FALSE;
if (arg0->type == COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_TEXTURE &&
arg0->texture_unit != arg1->texture_unit)
return FALSE;
/* Note we don't have to check the target; a texture unit can only
* have one target enabled at a time. */
if (arg0->type == COGL_MATERIAL_BACKEND_ARBFP_ARG_TYPE_CONSTANT &&
arg0->constant_id != arg0->constant_id)
return FALSE;
if (arg0->swizzle != arg1->swizzle &&
strcmp (arg0->swizzle, arg1->swizzle) != 0)
return FALSE;
return TRUE;
}
static void
append_function (CoglMaterial *material,
CoglBlendStringChannelMask mask,
GLint function,
CoglMaterialBackendARBfpArg *args,
int n_args)
{
CoglMaterial *arbfp_authority = get_arbfp_authority (material);
CoglMaterialBackendARBfpPrivate *priv =
arbfp_authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
const char *mask_name;
switch (mask)
{
case COGL_BLEND_STRING_CHANNEL_MASK_RGB:
mask_name = ".rgb";
break;
case COGL_BLEND_STRING_CHANNEL_MASK_ALPHA:
mask_name = ".a";
break;
case COGL_BLEND_STRING_CHANNEL_MASK_RGBA:
mask_name = "";
break;
default:
g_error ("Unknown channel mask %d", mask);
mask_name = "";
}
switch (function)
{
case GL_ADD:
g_string_append_printf (priv->source, "ADD_SAT output%s, ",
mask_name);
break;
case GL_MODULATE:
/* Note: no need to saturate since we can assume operands
* have values in the range [0,1] */
g_string_append_printf (priv->source, "MUL output%s, ",
mask_name);
break;
case GL_REPLACE:
/* Note: no need to saturate since we can assume operand
* has a value in the range [0,1] */
g_string_append_printf (priv->source, "MOV output%s, ",
mask_name);
break;
case GL_SUBTRACT:
g_string_append_printf (priv->source, "SUB_SAT output%s, ",
mask_name);
break;
case GL_ADD_SIGNED:
g_string_append_printf (priv->source, "ADD tmp3%s, ",
mask_name);
append_arg (priv->source, &args[0]);
g_string_append (priv->source, ", ");
append_arg (priv->source, &args[1]);
g_string_append (priv->source, ";\n");
g_string_append_printf (priv->source, "SUB_SAT output%s, tmp3, half",
mask_name);
n_args = 0;
break;
case GL_DOT3_RGB:
/* These functions are the same except that GL_DOT3_RGB never
* updates the alpha channel.
*
* NB: GL_DOT3_RGBA is a bit special because it effectively forces
* an RGBA mask and we end up ignoring any separate alpha channel
* function.
*/
case GL_DOT3_RGBA:
{
const char *tmp4 = "tmp4";
/* The maths for this was taken from Mesa;
* apparently:
*
* tmp3 = 2*src0 - 1
* tmp4 = 2*src1 - 1
* output = DP3 (tmp3, tmp4)
*
* is the same as:
*
* output = 4 * DP3 (src0 - 0.5, src1 - 0.5)
*/
g_string_append (priv->source, "MAD tmp3, two, ");
append_arg (priv->source, &args[0]);
g_string_append (priv->source, ", minus_one;\n");
if (!backend_arbfp_args_equal (&args[0], &args[1]))
{
g_string_append (priv->source, "MAD tmp4, two, ");
append_arg (priv->source, &args[1]);
g_string_append (priv->source, ", minus_one;\n");
}
else
tmp4 = "tmp3";
g_string_append_printf (priv->source,
"DP3_SAT output%s, tmp3, %s",
mask_name, tmp4);
n_args = 0;
}
break;
case GL_INTERPOLATE:
/* Note: no need to saturate since we can assume operands
* have values in the range [0,1] */
/* NB: GL_INTERPOLATE = arg0*arg2 + arg1*(1-arg2)
* but LRP dst, a, b, c = b*a + c*(1-a) */
g_string_append_printf (priv->source, "LRP output%s, ",
mask_name);
append_arg (priv->source, &args[2]);
g_string_append (priv->source, ", ");
append_arg (priv->source, &args[0]);
g_string_append (priv->source, ", ");
append_arg (priv->source, &args[1]);
n_args = 0;
break;
default:
g_error ("Unknown texture combine function %d", function);
g_string_append_printf (priv->source, "MUL_SAT output%s, ",
mask_name);
n_args = 2;
break;
}
if (n_args > 0)
append_arg (priv->source, &args[0]);
if (n_args > 1)
{
g_string_append (priv->source, ", ");
append_arg (priv->source, &args[1]);
}
g_string_append (priv->source, ";\n");
}
static void
append_masked_combine (CoglMaterial *arbfp_authority,
CoglMaterialLayer *layer,
CoglBlendStringChannelMask mask,
GLint function,
GLint *src,
GLint *op)
{
int i;
int n_args;
CoglMaterialBackendARBfpArg args[3];
n_args = get_n_args_for_combine_func (function);
for (i = 0; i < n_args; i++)
{
setup_arg (arbfp_authority,
layer,
mask,
i,
src[i],
op[i],
&args[i]);
}
append_function (arbfp_authority,
mask,
function,
args,
n_args);
}
static gboolean
_cogl_material_backend_arbfp_add_layer (CoglMaterial *material,
CoglMaterialLayer *layer,
unsigned long layers_difference)
{
CoglMaterial *arbfp_authority = get_arbfp_authority (material);
CoglMaterialBackendARBfpPrivate *priv =
arbfp_authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
CoglMaterialLayer *combine_authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_COMBINE);
CoglMaterialLayerBigState *big_state = combine_authority->big_state;
/* Notes...
*
* We are ignoring the issue of texture indirection limits until
* someone complains (Ref Section 3.11.6 in the ARB_fragment_program
* spec)
*
* There always five TEMPs named tmp0, tmp1 and tmp2, tmp3 and tmp4
* available and these constants: 'one' = {1, 1, 1, 1}, 'half'
* {.5, .5, .5, .5}, 'two' = {2, 2, 2, 2}, 'minus_one' = {-1, -1,
* -1, -1}
*
* tmp0-2 are intended for dealing with some of the texture combine
* operands (e.g. GL_ONE_MINUS_SRC_COLOR) tmp3/4 are for dealing
* with the GL_ADD_SIGNED texture combine and the GL_DOT3_RGB[A]
* functions.
*
* Each layer outputs to the TEMP called "output", and reads from
* output if it needs to refer to GL_PREVIOUS. (we detect if we are
* layer0 so we will read fragment.color for GL_PREVIOUS in that
* case)
*
* We aim to do all the channels together if the same function is
* used for RGB as for A.
*
* We aim to avoid string duplication / allocations during codegen.
*
* We are careful to only saturate when writing to output.
*/
if (!priv->source)
return TRUE;
if (!need_texture_combine_separate (combine_authority))
{
append_masked_combine (material,
layer,
COGL_BLEND_STRING_CHANNEL_MASK_RGBA,
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
}
else if (big_state->texture_combine_rgb_func == GL_DOT3_RGBA)
{
/* GL_DOT3_RGBA Is a bit weird as a GL_COMBINE_RGB function
* since if you use it, it overrides your ALPHA function...
*/
append_masked_combine (material,
layer,
COGL_BLEND_STRING_CHANNEL_MASK_RGBA,
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
}
else
{
append_masked_combine (material,
layer,
COGL_BLEND_STRING_CHANNEL_MASK_RGB,
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
append_masked_combine (material,
layer,
COGL_BLEND_STRING_CHANNEL_MASK_ALPHA,
big_state->texture_combine_alpha_func,
big_state->texture_combine_alpha_src,
big_state->texture_combine_alpha_op);
}
return TRUE;
}
gboolean
_cogl_material_backend_arbfp_passthrough (CoglMaterial *material)
{
CoglMaterial *arbfp_authority = get_arbfp_authority (material);
CoglMaterialBackendARBfpPrivate *priv =
arbfp_authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
if (!priv->source)
return TRUE;
g_string_append (priv->source, "MOV output, fragment.color.primary;\n");
return TRUE;
}
static gboolean
_cogl_material_backend_arbfp_end (CoglMaterial *material,
unsigned long materials_difference)
{
CoglMaterial *arbfp_authority = get_arbfp_authority (material);
CoglMaterialBackendARBfpPrivate *priv =
arbfp_authority->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
_COGL_GET_CONTEXT (ctx, FALSE);
if (priv->source)
{
GLenum gl_error;
COGL_STATIC_COUNTER (backend_arbfp_compile_counter,
"arbfp compile counter",
"Increments each time a new ARBfp "
"program is compiled",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, backend_arbfp_compile_counter);
g_string_append (priv->source, "MOV result.color,output;\n");
g_string_append (priv->source, "END\n");
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_SHOW_SOURCE))
g_message ("material program:\n%s", priv->source->str);
GE (glGenPrograms (1, &priv->gl_program));
GE (glBindProgram (GL_FRAGMENT_PROGRAM_ARB, priv->gl_program));
while ((gl_error = glGetError ()) != GL_NO_ERROR)
;
glProgramString (GL_FRAGMENT_PROGRAM_ARB,
GL_PROGRAM_FORMAT_ASCII_ARB,
priv->source->len,
priv->source->str);
if (glGetError () != GL_NO_ERROR)
{
g_warning ("\n%s\n%s",
priv->source->str,
glGetString (GL_PROGRAM_ERROR_STRING_ARB));
}
priv->source = NULL;
g_free (priv->sampled);
priv->sampled = NULL;
}
else
GE (glBindProgram (GL_FRAGMENT_PROGRAM_ARB, priv->gl_program));
use_program (COGL_INVALID_HANDLE, COGL_MATERIAL_PROGRAM_TYPE_ARBFP);
return TRUE;
}
static void
_cogl_material_backend_arbfp_material_pre_change_notify (
CoglMaterial *material,
CoglMaterialState change,
const CoglColor *new_color)
{
CoglMaterialBackendARBfpPrivate *priv =
material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
static const unsigned long fragment_op_changes =
COGL_MATERIAL_STATE_LAYERS;
/* TODO: COGL_MATERIAL_STATE_FOG */
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (material->backend_priv_set_mask & COGL_MATERIAL_BACKEND_ARBFP_MASK &&
priv->gl_program &&
change & fragment_op_changes)
{
GE (glDeletePrograms (1, &priv->gl_program));
priv->gl_program = 0;
}
}
static gboolean
invalidate_arbfp_authority_cache_cb (CoglMaterial *material,
void *user_data)
{
invalidate_arbfp_authority_cache (material);
return TRUE;
}
static void
_cogl_material_backend_arbfp_material_set_parent_notify (
CoglMaterial *material)
{
/* Any arbfp authority cache associated with this material or
* any of its descendants will now be invalid. */
invalidate_arbfp_authority_cache (material);
_cogl_material_foreach_child (material,
invalidate_arbfp_authority_cache_cb,
NULL);
}
static void
_cogl_material_backend_arbfp_layer_pre_change_notify (
CoglMaterialLayer *layer,
CoglMaterialLayerState changes)
{
/* TODO: we could be saving snippets of texture combine code along
* with each layer and then when a layer changes we would just free
* the snippet. */
return;
}
static void
_cogl_material_backend_arbfp_free_priv (CoglMaterial *material)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (material->backend_priv_set_mask & COGL_MATERIAL_BACKEND_ARBFP_MASK)
{
CoglMaterialBackendARBfpPrivate *priv =
material->backend_privs[COGL_MATERIAL_BACKEND_ARBFP];
glDeletePrograms (1, &priv->gl_program);
if (priv->sampled)
g_free (priv->sampled);
g_slice_free (CoglMaterialBackendARBfpPrivate, priv);
material->backend_priv_set_mask &= ~COGL_MATERIAL_BACKEND_ARBFP_MASK;
}
}
static const CoglMaterialBackend _cogl_material_arbfp_backend =
{
_cogl_material_backend_arbfp_get_max_texture_units,
_cogl_material_backend_arbfp_start,
_cogl_material_backend_arbfp_add_layer,
_cogl_material_backend_arbfp_passthrough,
_cogl_material_backend_arbfp_end,
_cogl_material_backend_arbfp_material_pre_change_notify,
_cogl_material_backend_arbfp_material_set_parent_notify,
_cogl_material_backend_arbfp_layer_pre_change_notify,
_cogl_material_backend_arbfp_free_priv,
NULL
};
#endif /* COGL_MATERIAL_BACKEND_ARBFP */
static int
_cogl_material_backend_fixed_get_max_texture_units (void)
{
_COGL_GET_CONTEXT (ctx, 0);
/* This function is called quite often so we cache the value to
avoid too many GL calls */
if (ctx->max_texture_units == -1)
{
ctx->max_texture_units = 1;
GE (glGetIntegerv (GL_MAX_TEXTURE_UNITS,
&ctx->max_texture_units));
}
return ctx->max_texture_units;
}
static gboolean
_cogl_material_backend_fixed_start (CoglMaterial *material,
int n_layers,
unsigned long materials_difference)
{
use_program (COGL_INVALID_HANDLE, COGL_MATERIAL_PROGRAM_TYPE_FIXED);
return TRUE;
}
static gboolean
_cogl_material_backend_fixed_add_layer (CoglMaterial *material,
CoglMaterialLayer *layer,
unsigned long layers_difference)
{
CoglTextureUnit *unit =
_cogl_get_texture_unit (_cogl_material_layer_get_unit_index (layer));
int unit_index = unit->index;
int n_rgb_func_args;
int n_alpha_func_args;
_COGL_GET_CONTEXT (ctx, FALSE);
/* XXX: Beware that since we are changing the active texture unit we
* must make sure we don't call into other Cogl components that may
* temporarily bind texture objects to query/modify parameters since
* they will end up binding texture unit 1. See
* _cogl_bind_gl_texture_transient for more details.
*/
set_active_texture_unit (unit_index);
if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_COMBINE);
CoglMaterialLayerBigState *big_state = authority->big_state;
GE (glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE));
/* Set the combiner functions... */
GE (glTexEnvi (GL_TEXTURE_ENV,
GL_COMBINE_RGB,
big_state->texture_combine_rgb_func));
GE (glTexEnvi (GL_TEXTURE_ENV,
GL_COMBINE_ALPHA,
big_state->texture_combine_alpha_func));
/*
* Setup the function arguments...
*/
/* For the RGB components... */
n_rgb_func_args =
get_n_args_for_combine_func (big_state->texture_combine_rgb_func);
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_RGB,
big_state->texture_combine_rgb_src[0]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB,
big_state->texture_combine_rgb_op[0]));
if (n_rgb_func_args > 1)
{
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB,
big_state->texture_combine_rgb_src[1]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB,
big_state->texture_combine_rgb_op[1]));
}
if (n_rgb_func_args > 2)
{
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_RGB,
big_state->texture_combine_rgb_src[2]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_RGB,
big_state->texture_combine_rgb_op[2]));
}
/* For the Alpha component */
n_alpha_func_args =
get_n_args_for_combine_func (big_state->texture_combine_alpha_func);
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC0_ALPHA,
big_state->texture_combine_alpha_src[0]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA,
big_state->texture_combine_alpha_op[0]));
if (n_alpha_func_args > 1)
{
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA,
big_state->texture_combine_alpha_src[1]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA,
big_state->texture_combine_alpha_op[1]));
}
if (n_alpha_func_args > 2)
{
GE (glTexEnvi (GL_TEXTURE_ENV, GL_SRC2_ALPHA,
big_state->texture_combine_alpha_src[2]));
GE (glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND2_ALPHA,
big_state->texture_combine_alpha_op[2]));
}
}
if (layers_difference & COGL_MATERIAL_LAYER_STATE_COMBINE)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_COMBINE);
CoglMaterialLayerBigState *big_state = authority->big_state;
GE (glTexEnvfv (GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR,
big_state->texture_combine_constant));
}
return TRUE;
}
static gboolean
_cogl_material_backend_fixed_end (CoglMaterial *material,
unsigned long materials_difference)
{
return TRUE;
}
static const CoglMaterialBackend _cogl_material_fixed_backend =
{
_cogl_material_backend_fixed_get_max_texture_units,
_cogl_material_backend_fixed_start,
_cogl_material_backend_fixed_add_layer,
NULL, /* passthrough */
_cogl_material_backend_fixed_end,
NULL, /* material_change_notify */
NULL, /* material_set_parent_notify */
NULL, /* layer_change_notify */
NULL /* free_priv */
};
static void
_cogl_material_layer_get_texture_info (CoglMaterialLayer *layer,
CoglHandle *texture,
GLuint *gl_texture,
GLuint *gl_target)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
*texture = layer->texture;
if (G_UNLIKELY (*texture == COGL_INVALID_HANDLE))
*texture = ctx->default_gl_texture_2d_tex;
cogl_texture_get_gl_texture (*texture, gl_texture, gl_target);
return;
}
#ifndef HAVE_COGL_GLES
static gboolean
blend_factor_uses_constant (GLenum blend_factor)
{
return (blend_factor == GL_CONSTANT_COLOR ||
blend_factor == GL_ONE_MINUS_CONSTANT_COLOR ||
blend_factor == GL_CONSTANT_ALPHA ||
blend_factor == GL_ONE_MINUS_CONSTANT_ALPHA);
}
#endif
static void
flush_depth_state (CoglMaterialDepthState *depth_state)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->depth_test_function_cache != depth_state->depth_test_function)
{
GE (glDepthFunc (depth_state->depth_test_function));
ctx->depth_test_function_cache = depth_state->depth_test_function;
}
if (ctx->depth_writing_enabled_cache != depth_state->depth_writing_enabled)
{
GE (glDepthMask (depth_state->depth_writing_enabled ?
GL_TRUE : GL_FALSE));
ctx->depth_writing_enabled_cache = depth_state->depth_writing_enabled;
}
#ifndef COGL_HAS_GLES
if (ctx->depth_range_near_cache != depth_state->depth_range_near ||
ctx->depth_range_far_cache != depth_state->depth_range_far)
{
#ifdef COGL_HAS_GLES2
GE (glDepthRangef (depth_state->depth_range_near,
depth_state->depth_range_far));
#else
GE (glDepthRange (depth_state->depth_range_near,
depth_state->depth_range_far));
#endif
ctx->depth_range_near_cache = depth_state->depth_range_near;
ctx->depth_range_far_cache = depth_state->depth_range_far;
}
#endif /* COGL_HAS_GLES */
}
static void
_cogl_material_flush_color_blend_alpha_depth_state (
CoglMaterial *material,
unsigned long materials_difference,
gboolean skip_gl_color)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!skip_gl_color)
{
if ((materials_difference & COGL_MATERIAL_STATE_COLOR) ||
/* Assume if we were previously told to skip the color, then
* the current color needs updating... */
ctx->current_material_skip_gl_color)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_COLOR);
GE (glColor4ub (cogl_color_get_red_byte (&authority->color),
cogl_color_get_green_byte (&authority->color),
cogl_color_get_blue_byte (&authority->color),
cogl_color_get_alpha_byte (&authority->color)));
}
}
if (materials_difference & COGL_MATERIAL_STATE_LIGHTING)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_LIGHTING);
CoglMaterialLightingState *lighting_state =
&authority->big_state->lighting_state;
/* FIXME - we only need to set these if lighting is enabled... */
GLfloat shininess = lighting_state->shininess * 128.0f;
GE (glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT, lighting_state->ambient));
GE (glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, lighting_state->diffuse));
GE (glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR, lighting_state->specular));
GE (glMaterialfv (GL_FRONT_AND_BACK, GL_EMISSION, lighting_state->emission));
GE (glMaterialfv (GL_FRONT_AND_BACK, GL_SHININESS, &shininess));
}
if (materials_difference & COGL_MATERIAL_STATE_BLEND)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_BLEND);
CoglMaterialBlendState *blend_state =
&authority->big_state->blend_state;
#if defined (HAVE_COGL_GLES2)
gboolean have_blend_equation_seperate = TRUE;
gboolean have_blend_func_separate = TRUE;
#elif defined (HAVE_COGL_GL)
gboolean have_blend_equation_seperate = FALSE;
gboolean have_blend_func_separate = FALSE;
if (ctx->drv.pf_glBlendEquationSeparate) /* Only GL 2.0 + */
have_blend_equation_seperate = TRUE;
if (ctx->drv.pf_glBlendFuncSeparate) /* Only GL 1.4 + */
have_blend_func_separate = TRUE;
#endif
#ifndef HAVE_COGL_GLES /* GLES 1 only has glBlendFunc */
if (blend_factor_uses_constant (blend_state->blend_src_factor_rgb) ||
blend_factor_uses_constant (blend_state->blend_src_factor_alpha) ||
blend_factor_uses_constant (blend_state->blend_dst_factor_rgb) ||
blend_factor_uses_constant (blend_state->blend_dst_factor_alpha))
{
float red =
cogl_color_get_red_float (&blend_state->blend_constant);
float green =
cogl_color_get_green_float (&blend_state->blend_constant);
float blue =
cogl_color_get_blue_float (&blend_state->blend_constant);
float alpha =
cogl_color_get_alpha_float (&blend_state->blend_constant);
GE (glBlendColor (red, green, blue, alpha));
}
if (have_blend_equation_seperate &&
blend_state->blend_equation_rgb != blend_state->blend_equation_alpha)
GE (glBlendEquationSeparate (blend_state->blend_equation_rgb,
blend_state->blend_equation_alpha));
else
GE (glBlendEquation (blend_state->blend_equation_rgb));
if (have_blend_func_separate &&
(blend_state->blend_src_factor_rgb != blend_state->blend_src_factor_alpha ||
(blend_state->blend_src_factor_rgb !=
blend_state->blend_src_factor_alpha)))
GE (glBlendFuncSeparate (blend_state->blend_src_factor_rgb,
blend_state->blend_dst_factor_rgb,
blend_state->blend_src_factor_alpha,
blend_state->blend_dst_factor_alpha));
else
#endif
GE (glBlendFunc (blend_state->blend_src_factor_rgb,
blend_state->blend_dst_factor_rgb));
}
if (materials_difference & COGL_MATERIAL_STATE_ALPHA_FUNC)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_ALPHA_FUNC);
CoglMaterialAlphaFuncState *alpha_state =
&authority->big_state->alpha_state;
/* NB: Currently the Cogl defines are compatible with the GL ones: */
GE (glAlphaFunc (alpha_state->alpha_func,
alpha_state->alpha_func_reference));
}
if (materials_difference & COGL_MATERIAL_STATE_DEPTH)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_DEPTH);
CoglMaterialDepthState *depth_state = &authority->big_state->depth_state;
if (depth_state->depth_test_enabled)
{
if (ctx->depth_test_enabled_cache != TRUE)
{
GE (glEnable (GL_DEPTH_TEST));
ctx->depth_test_enabled_cache = depth_state->depth_test_enabled;
}
flush_depth_state (depth_state);
}
else if (ctx->depth_test_enabled_cache != FALSE)
{
GE (glDisable (GL_DEPTH_TEST));
ctx->depth_test_enabled_cache = depth_state->depth_test_enabled;
}
}
if (material->real_blend_enable != ctx->gl_blend_enable_cache)
{
if (material->real_blend_enable)
GE (glEnable (GL_BLEND));
else
GE (glDisable (GL_BLEND));
/* XXX: we shouldn't update any other blend state if blending
* is disabled! */
ctx->gl_blend_enable_cache = material->real_blend_enable;
}
}
static int
get_max_activateable_texture_units (void)
{
_COGL_GET_CONTEXT (ctx, 0);
if (G_UNLIKELY (ctx->max_activateable_texture_units == -1))
{
#ifdef HAVE_COGL_GL
GLint max_tex_coords;
GLint max_combined_tex_units;
GE (glGetIntegerv (GL_MAX_TEXTURE_COORDS, &max_tex_coords));
GE (glGetIntegerv (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,
&max_combined_tex_units));
ctx->max_activateable_texture_units =
MAX (max_tex_coords - 1, max_combined_tex_units);
#else
GE (glGetIntegerv (GL_MAX_TEXTURE_UNITS,
&ctx->max_activateable_texture_units));
#endif
}
return ctx->max_activateable_texture_units;
}
typedef struct
{
int i;
unsigned long *layer_differences;
} CoglMaterialFlushLayerState;
static gboolean
flush_layers_common_gl_state_cb (CoglMaterialLayer *layer, void *user_data)
{
CoglMaterialFlushLayerState *flush_state = user_data;
int unit_index = flush_state->i;
CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);
unsigned long layers_difference =
flush_state->layer_differences[unit_index];
/* There may not be enough texture units so we can bail out if
* that's the case...
*/
if (G_UNLIKELY (unit_index >= get_max_activateable_texture_units ()))
{
static gboolean shown_warning = FALSE;
if (!shown_warning)
{
g_warning ("Your hardware does not have enough texture units"
"to handle this many texture layers");
shown_warning = TRUE;
}
return FALSE;
}
if (layers_difference & COGL_MATERIAL_LAYER_STATE_TEXTURE)
{
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer,
COGL_MATERIAL_LAYER_STATE_TEXTURE);
CoglHandle texture = NULL;
GLuint gl_texture;
GLenum gl_target;
_cogl_material_layer_get_texture_info (authority,
&texture,
&gl_texture,
&gl_target);
set_active_texture_unit (unit_index);
/* NB: There are several Cogl components and some code in
* Clutter that will temporarily bind arbitrary GL textures to
* query and modify texture object parameters. If you look at
* _cogl_bind_gl_texture_transient() you can see we make sure
* that such code always binds to texture unit 1 which means we
* can't rely on the unit->gl_texture state if unit->index == 1.
*
* Because texture unit 1 is a bit special we actually defer any
* necessary glBindTexture for it until the end of
* _cogl_material_flush_gl_state().
*
* NB: we get notified whenever glDeleteTextures is used (see
* _cogl_delete_gl_texture()) where we invalidate
* unit->gl_texture references to deleted textures so it's safe
* to compare unit->gl_texture with gl_texture. (Without the
* hook it would be possible to delete a GL texture and create a
* new one with the same name and comparing unit->gl_texture and
* gl_texture wouldn't detect that.)
*
* NB: for foreign textures we don't know how the deletion of
* the GL texture objects correspond to the deletion of the
* CoglTextures so if there was previously a foreign texture
* associated with the texture unit then we can't assume that we
* aren't seeing a recycled texture name so we have to bind.
*/
if (unit->gl_texture != gl_texture || unit->is_foreign)
{
if (unit_index != 1)
GE (glBindTexture (gl_target, gl_texture));
unit->gl_texture = gl_texture;
}
unit->is_foreign = _cogl_texture_is_foreign (texture);
/* Disable the previous target if it was different and it's
* still enabled */
if (unit->enabled && unit->current_gl_target != gl_target)
GE (glDisable (unit->current_gl_target));
if (!G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_TEXTURING) &&
(!unit->enabled || unit->current_gl_target != gl_target))
{
GE (glEnable (gl_target));
unit->enabled = TRUE;
unit->current_gl_target = gl_target;
}
/* The texture_storage_changed boolean indicates if the
* CoglTexture's underlying GL texture storage has changed since
* it was flushed to the texture unit. We've just flushed the
* latest state so we can reset this. */
unit->texture_storage_changed = FALSE;
}
else
{
/* Even though there may be no difference between the last flushed
* texture state and the current layers texture state it may be that the
* texture unit has been disabled for some time so we need to assert that
* it's enabled now.
*/
if (!G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_TEXTURING) &&
!unit->enabled)
{
GE (glEnable (unit->current_gl_target));
unit->enabled = TRUE;
}
}
if (layers_difference & COGL_MATERIAL_LAYER_STATE_USER_MATRIX)
{
CoglMaterialLayerState state = COGL_MATERIAL_LAYER_STATE_USER_MATRIX;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, state);
_cogl_matrix_stack_set (unit->matrix_stack,
&authority->big_state->matrix);
_cogl_matrix_stack_flush_to_gl (unit->matrix_stack, COGL_MATRIX_TEXTURE);
}
cogl_handle_ref (layer);
if (unit->layer != COGL_INVALID_HANDLE)
cogl_handle_unref (unit->layer);
unit->layer = layer;
unit->layer_changes_since_flush = 0;
flush_state->i++;
return TRUE;
}
static void
_cogl_material_flush_common_gl_state (CoglMaterial *material,
unsigned long materials_difference,
unsigned long *layer_differences,
gboolean skip_gl_color)
{
CoglMaterialFlushLayerState state;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_material_flush_color_blend_alpha_depth_state (material,
materials_difference,
skip_gl_color);
state.i = 0;
state.layer_differences = layer_differences;
_cogl_material_foreach_layer (material,
flush_layers_common_gl_state_cb,
&state);
/* Disable additional texture units that may have previously been in use.. */
for (; state.i < ctx->texture_units->len; state.i++)
disable_texture_unit (state.i);
}
/* Re-assert the layer's wrap modes on the given CoglTexture.
*
* Note: we don't simply forward the wrap modes to layer->texture
* since the actual texture being used may have been overridden.
*/
static void
_cogl_material_layer_forward_wrap_modes (CoglMaterialLayer *layer,
CoglHandle texture)
{
CoglMaterialWrapModeInternal wrap_mode_s, wrap_mode_t, wrap_mode_r;
GLenum gl_wrap_mode_s, gl_wrap_mode_t, gl_wrap_mode_r;
if (texture == COGL_INVALID_HANDLE)
return;
_cogl_material_layer_get_wrap_modes (layer,
&wrap_mode_s,
&wrap_mode_t,
&wrap_mode_r);
/* Update the wrap mode on the texture object. The texture backend
should cache the value so that it will be a no-op if the object
already has the same wrap mode set. The backend is best placed to
do this because it knows how many of the coordinates will
actually be used (ie, a 1D texture only cares about the 's'
coordinate but a 3D texture would use all three). GL uses the
wrap mode as part of the texture object state but we are
pretending it's part of the per-layer environment state. This
will break if the application tries to use different modes in
different layers using the same texture. */
if (wrap_mode_s == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_s = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_s = wrap_mode_s;
if (wrap_mode_t == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_t = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_t = wrap_mode_t;
if (wrap_mode_r == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_r = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_r = wrap_mode_r;
_cogl_texture_set_wrap_mode_parameters (texture,
gl_wrap_mode_s,
gl_wrap_mode_t,
gl_wrap_mode_r);
}
/* OpenGL associates the min/mag filters and repeat modes with the
* texture object not the texture unit so we always have to re-assert
* the filter and repeat modes whenever we use a texture since it may
* be referenced by multiple materials with different modes.
*
* XXX: GL_ARB_sampler_objects fixes this in OpenGL so we should
* eventually look at using this extension when available.
*/
static void
foreach_texture_unit_update_filter_and_wrap_modes (void)
{
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
for (i = 0; i < ctx->texture_units->len; i++)
{
CoglTextureUnit *unit =
&g_array_index (ctx->texture_units, CoglTextureUnit, i);
if (!unit->enabled)
break;
if (unit->layer)
{
CoglHandle texture = _cogl_material_layer_get_texture (unit->layer);
CoglMaterialFilter min;
CoglMaterialFilter mag;
_cogl_material_layer_get_filters (unit->layer, &min, &mag);
_cogl_texture_set_filters (texture, min, mag);
_cogl_material_layer_forward_wrap_modes (unit->layer, texture);
}
}
}
typedef struct
{
int i;
unsigned long *layer_differences;
} CoglMaterialCompareLayersState;
static gboolean
compare_layer_differences_cb (CoglMaterialLayer *layer, void *user_data)
{
CoglMaterialCompareLayersState *state = user_data;
CoglTextureUnit *unit = _cogl_get_texture_unit (state->i);
if (unit->layer == layer)
state->layer_differences[state->i] = unit->layer_changes_since_flush;
else if (unit->layer)
{
state->layer_differences[state->i] = unit->layer_changes_since_flush;
state->layer_differences[state->i] |=
_cogl_material_layer_compare_differences (layer, unit->layer);
}
else
state->layer_differences[state->i] = COGL_MATERIAL_LAYER_STATE_ALL_SPARSE;
/* XXX: There is always a possibility that a CoglTexture's
* underlying GL texture storage has been changed since it was last
* bound to a texture unit which is why we have a callback into
* _cogl_material_texture_storage_change_notify whenever a textures
* underlying GL texture storage changes which will set the
* unit->texture_intern_changed flag. If we see that's been set here
* then we force an update of the texture state...
*/
if (unit->texture_storage_changed)
state->layer_differences[state->i] |= COGL_MATERIAL_LAYER_STATE_TEXTURE;
state->i++;
return TRUE;
}
typedef struct
{
const CoglMaterialBackend *backend;
CoglMaterial *material;
unsigned long *layer_differences;
gboolean error_adding_layer;
gboolean added_layer;
} CoglMaterialBackendAddLayerState;
static gboolean
backend_add_layer_cb (CoglMaterialLayer *layer,
void *user_data)
{
CoglMaterialBackendAddLayerState *state = user_data;
const CoglMaterialBackend *backend = state->backend;
CoglMaterial *material = state->material;
int unit_index = _cogl_material_layer_get_unit_index (layer);
CoglTextureUnit *unit = _cogl_get_texture_unit (unit_index);
_COGL_GET_CONTEXT (ctx, FALSE);
/* NB: We don't support the random disabling of texture
* units, so as soon as we hit a disabled unit we know all
* subsequent units are also disabled */
if (!unit->enabled)
return FALSE;
if (G_UNLIKELY (unit_index >= backend->get_max_texture_units ()))
{
int j;
for (j = unit_index; j < ctx->texture_units->len; j++)
disable_texture_unit (j);
/* TODO: although this isn't considered an error that
* warrants falling back to a different backend we
* should print a warning here. */
return FALSE;
}
/* Either generate per layer code snippets or setup the
* fixed function glTexEnv for each layer... */
if (G_LIKELY (backend->add_layer (material,
layer,
state->layer_differences[unit_index])))
state->added_layer = TRUE;
else
{
state->error_adding_layer = TRUE;
return FALSE;
}
return TRUE;
}
/*
* _cogl_material_flush_gl_state:
*
* Details of override options:
* ->fallback_mask: is a bitmask of the material layers that need to be
* replaced with the default, fallback textures. The fallback textures are
* fully transparent textures so they hopefully wont contribute to the
* texture combining.
*
* The intention of fallbacks is to try and preserve
* the number of layers the user is expecting so that texture coordinates
* they gave will mostly still correspond to the textures they intended, and
* have a fighting chance of looking close to their originally intended
* result.
*
* ->disable_mask: is a bitmask of the material layers that will simply have
* texturing disabled. It's only really intended for disabling all layers
* > X; i.e. we'd expect to see a contiguous run of 0 starting from the LSB
* and at some point the remaining bits flip to 1. It might work to disable
* arbitrary layers; though I'm not sure a.t.m how OpenGL would take to
* that.
*
* The intention of the disable_mask is for emitting geometry when the user
* hasn't supplied enough texture coordinates for all the layers and it's
* not possible to auto generate default texture coordinates for those
* layers.
*
* ->layer0_override_texture: forcibly tells us to bind this GL texture name for
* layer 0 instead of plucking the gl_texture from the CoglTexture of layer
* 0.
*
* The intention of this is for any primitives that supports sliced textures.
* The code will can iterate each of the slices and re-flush the material
* forcing the GL texture of each slice in turn.
*
* ->wrap_mode_overrides: overrides the wrap modes set on each
* layer. This is used to implement the automatic wrap mode.
*
* XXX: It might also help if we could specify a texture matrix for code
* dealing with slicing that would be multiplied with the users own matrix.
*
* Normaly texture coords in the range [0, 1] refer to the extents of the
* texture, but when your GL texture represents a slice of the real texture
* (from the users POV) then a texture matrix would be a neat way of
* transforming the mapping for each slice.
*
* Currently for textured rectangles we manually calculate the texture
* coords for each slice based on the users given coords, but this solution
* isn't ideal, and can't be used with CoglVertexBuffers.
*/
void
_cogl_material_flush_gl_state (CoglHandle handle,
gboolean skip_gl_color)
{
CoglMaterial *material = COGL_MATERIAL (handle);
unsigned long materials_difference;
int n_layers;
unsigned long *layer_differences = NULL;
int i;
CoglTextureUnit *unit1;
COGL_STATIC_TIMER (material_flush_timer,
"Mainloop", /* parent */
"Material Flush",
"The time spent flushing material state",
0 /* no application private data */);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
COGL_TIMER_START (_cogl_uprof_context, material_flush_timer);
if (ctx->current_material == material)
materials_difference = ctx->current_material_changes_since_flush;
else if (ctx->current_material)
{
materials_difference = ctx->current_material_changes_since_flush;
materials_difference |=
_cogl_material_compare_differences (ctx->current_material,
material);
}
else
materials_difference = COGL_MATERIAL_STATE_ALL_SPARSE;
/* Get a layer_differences mask for each layer to be flushed */
n_layers = cogl_material_get_n_layers (material);
if (n_layers)
{
CoglMaterialCompareLayersState state;
layer_differences = g_alloca (sizeof (unsigned long *) * n_layers);
memset (layer_differences, 0, sizeof (layer_differences));
state.i = 0;
state.layer_differences = layer_differences;
_cogl_material_foreach_layer (material,
compare_layer_differences_cb,
&state);
}
/* First flush everything that's the same regardless of which
* material backend is being used...
*
* 1) top level state:
* glColor (or skip if a vertex attribute is being used for color)
* blend state
* alpha test state (except for GLES 2.0)
*
* 2) then foreach layer:
* determine gl_target/gl_texture
* bind texture
* enable/disable target
* flush user matrix
*
* Note: After _cogl_material_flush_common_gl_state you can expect
* all state of the layers corresponding texture unit to be
* updated.
*/
_cogl_material_flush_common_gl_state (material,
materials_difference,
layer_differences,
skip_gl_color);
/* Now flush the fragment processing state according to the current
* fragment processing backend.
*
* Note: Some of the backends may not support the current material
* configuration and in that case it will report an error and we
* will fallback to a different backend.
*
* NB: if material->backend != COGL_MATERIAL_BACKEND_UNDEFINED then
* we have previously managed to successfully flush this material
* with the given backend so we will simply use that to avoid
* fallback code paths.
*/
if (material->backend == COGL_MATERIAL_BACKEND_UNDEFINED)
_cogl_material_set_backend (material, COGL_MATERIAL_BACKEND_DEFAULT);
for (i = material->backend;
i < G_N_ELEMENTS (backends);
i++, _cogl_material_set_backend (material, i))
{
const CoglMaterialBackend *backend = backends[i];
CoglMaterialBackendAddLayerState state;
/* E.g. For backends generating code they can setup their
* scratch buffers here... */
if (G_UNLIKELY (!backend->start (material,
n_layers,
materials_difference)))
continue;
state.backend = backend;
state.material = material;
state.layer_differences = layer_differences;
state.error_adding_layer = FALSE;
state.added_layer = FALSE;
_cogl_material_foreach_layer (material,
backend_add_layer_cb,
&state);
if (G_UNLIKELY (state.error_adding_layer))
continue;
if (!state.added_layer &&
backend->passthrough &&
G_UNLIKELY (!backend->passthrough (material)))
continue;
/* For backends generating code they may compile and link their
* programs here, update any uniforms and tell OpenGL to use
* that program.
*/
if (G_UNLIKELY (!backend->end (material, materials_difference)))
continue;
break;
}
/* FIXME: This reference is actually resulting in lots of
* copy-on-write reparenting because one-shot materials end up
* living for longer than necessary and so any later modification of
* the parent will cause a copy-on-write.
*
* XXX: The issue should largely go away when we switch to using
* weak materials for overrides.
*/
cogl_handle_ref (handle);
if (ctx->current_material != COGL_INVALID_HANDLE)
cogl_handle_unref (ctx->current_material);
ctx->current_material = handle;
ctx->current_material_changes_since_flush = 0;
ctx->current_material_skip_gl_color = skip_gl_color;
/* Handle the fact that OpenGL associates texture filter and wrap
* modes with the texture objects not the texture units... */
foreach_texture_unit_update_filter_and_wrap_modes ();
/* If this material has more than one layer then we always need
* to make sure we rebind the texture for unit 1.
*
* NB: various components of Cogl may temporarily bind arbitrary
* textures to texture unit 1 so they can query and modify texture
* object parameters. cogl-material.c (See
* _cogl_bind_gl_texture_transient)
*/
unit1 = _cogl_get_texture_unit (1);
if (unit1->enabled && unit1->dirty_gl_texture)
{
set_active_texture_unit (1);
GE (glBindTexture (unit1->current_gl_target, unit1->gl_texture));
unit1->dirty_gl_texture = FALSE;
}
COGL_TIMER_STOP (_cogl_uprof_context, material_flush_timer);
}
/* While a material is referenced by the Cogl journal we can not allow
* modifications, so this gives us a mechanism to track journal
* references separately */
CoglHandle
_cogl_material_journal_ref (CoglHandle material_handle)
{
CoglMaterial *material = COGL_MATERIAL (material_handle);
material->journal_ref_count++;
cogl_handle_ref (material_handle);
return material_handle;
}
void
_cogl_material_journal_unref (CoglHandle material_handle)
{
CoglMaterial *material =
_cogl_material_pointer_from_handle (material_handle);
material->journal_ref_count--;
cogl_handle_unref (material_handle);
}
void
_cogl_material_apply_legacy_state (CoglHandle handle)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* It was a mistake that we ever copied the OpenGL style API for
* associating these things directly with the context when we
* originally wrote Cogl. Until the corresponding deprecated APIs
* can be removed though we now shoehorn the state changes through
* the cogl_material API instead.
*/
if (ctx->current_program)
_cogl_material_set_user_program (handle, ctx->current_program);
if (ctx->legacy_depth_test_enabled)
cogl_material_set_depth_test_enabled (handle, TRUE);
}
void
_cogl_material_set_static_breadcrumb (CoglHandle handle,
const char *breadcrumb)
{
CoglMaterial *material = COGL_MATERIAL (handle);
material->has_static_breadcrumb = TRUE;
material->static_breadcrumb = breadcrumb;
}
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