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mutter/cogl/cogl-material-opengl.c
Neil Roberts 0ab6dc9db1 cogl-material: Don't map the shininess value to [0,1] 
In OpenGL the 'shininess' lighting parameter is floating point value
limited to the range 0.0→128.0. This number is used to affect the size
of the specular highlight. Cogl materials used to only accept a number
between 0.0 and 1.0 which then gets multiplied by 128.0 before sending
to GL. I think the assumption was that this is just a weird GL quirk
so we don't expose it. However the value is used as an exponent to
raise the attenuation to a power so there is no conceptual limit to
the value.

This removes the mapping and changes some of the documentation.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2222
2010-07-22 17:52:51 +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-material-opengl-private.h"
#include "cogl-material-private.h"
#include "cogl-context.h"
#include "cogl-texture-private.h"
#ifndef HAVE_COGL_GLES
#include "cogl-program.h"
#endif
#ifdef COGL_MATERIAL_BACKEND_GLSL
#include "cogl-material-glsl-private.h"
#endif
#ifdef COGL_MATERIAL_BACKEND_ARBFP
#include "cogl-material-arbfp-private.h"
#endif
#ifdef COGL_MATERIAL_BACKEND_FIXED
#include "cogl-material-fixed-private.h"
#endif
#include <glib.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
/* These aren't defined in the GLES headers */
#ifndef GL_POINT_SPRITE
#define GL_POINT_SPRITE 0x8861
#endif
#ifndef GL_COORD_REPLACE
#define GL_COORD_REPLACE 0x8862
#endif
#ifndef GL_CLAMP_TO_BORDER
#define GL_CLAMP_TO_BORDER 0x812d
#endif
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_object_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);
}
void
_cogl_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;
}
}
void
_cogl_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)
{
_cogl_set_active_texture_unit (unit_index);
GE (glDisable (unit->current_gl_target));
unit->enabled = FALSE;
}
}
/* 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.
*/
_cogl_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 */
}
}
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_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
}
void
_cogl_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. */
_cogl_gl_use_program_wrapper (0);
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. */
_cogl_gl_use_program_wrapper (0);
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)
int
_cogl_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
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;
if (layer->texture_overridden)
{
*gl_texture = layer->slice_gl_texture;
*gl_target = layer->slice_gl_target;
}
else
cogl_texture_get_gl_texture (*texture, gl_texture, gl_target);
}
#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;
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,
&lighting_state->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 (materials_difference & COGL_MATERIAL_STATE_POINT_SIZE)
{
CoglMaterial *authority =
_cogl_material_get_authority (material, COGL_MATERIAL_STATE_POINT_SIZE);
if (ctx->point_size_cache != authority->big_state->point_size)
{
GE( glPointSize (authority->big_state->point_size) );
ctx->point_size_cache = authority->big_state->point_size;
}
}
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);
_cogl_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);
}
if (layers_difference & COGL_MATERIAL_LAYER_STATE_POINT_SPRITE_COORDS)
{
CoglMaterialState change = COGL_MATERIAL_LAYER_STATE_POINT_SPRITE_COORDS;
CoglMaterialLayer *authority =
_cogl_material_layer_get_authority (layer, change);
CoglMaterialLayerBigState *big_state = authority->big_state;
_cogl_set_active_texture_unit (unit_index);
GE (glTexEnvi (GL_POINT_SPRITE, GL_COORD_REPLACE,
big_state->point_sprite_coords));
}
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++)
_cogl_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_p;
GLenum gl_wrap_mode_s, gl_wrap_mode_t, gl_wrap_mode_p;
if (texture == COGL_INVALID_HANDLE)
return;
_cogl_material_layer_get_wrap_modes (layer,
&wrap_mode_s,
&wrap_mode_t,
&wrap_mode_p);
/* 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_p == COGL_MATERIAL_WRAP_MODE_INTERNAL_AUTOMATIC)
gl_wrap_mode_p = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_p = wrap_mode_p;
_cogl_texture_set_wrap_mode_parameters (texture,
gl_wrap_mode_s,
gl_wrap_mode_t,
gl_wrap_mode_p);
}
/* 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++)
_cogl_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 (CoglMaterial *material,
gboolean skip_gl_color)
{
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 (_cogl_material_backends);
i++, _cogl_material_set_backend (material, i))
{
const CoglMaterialBackend *backend = _cogl_material_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_object_ref (material);
if (ctx->current_material != NULL)
cogl_object_unref (ctx->current_material);
ctx->current_material = material;
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)
{
_cogl_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);
}
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