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mutter/cogl/driver/gl/cogl-pipeline-opengl.c
Neil Roberts 2616ae0fa9 Add a GL 3 driver 
This adds a new CoglDriver for GL 3 called COGL_DRIVER_GL3. When
requested, the GLX, EGL and SDL2 winsyss will set the necessary
attributes to request a forward-compatible core profile 3.1 context.
That means it will have no deprecated features.

To simplify the explosion of checks for specific combinations of
context->driver, many of these conditionals have now been replaced
with private feature flags that are checked instead. The GL and GLES
drivers now initialise these private feature flags depending on which
driver is used.

The fixed function backends now explicitly check whether the fixed
function private feature is available which means the GL3 driver will
fall back to always using the GLSL progend. Since Rob's latest patches
the GLSL progend no longer uses any fixed function API anyway so it
should just work.

The driver is currently lower priority than COGL_DRIVER_GL so it will
not be used unless it is specificly requested. We may want to change
this priority at some point because apparently Mesa can make some
memory savings if a core profile context is used.

In GL 3, getting the combined extensions string with glGetString is
deprecated so this patch changes it to use glGetStringi to build up an
array of extensions instead. _cogl_context_get_gl_extensions now
returns this array instead of trying to return a const string. The
caller is expected to free the array.

Some issues with this patch:

• GL 3 does not support GL_ALPHA format textures. We should probably
  make this a feature flag or something. Cogl uses this to render text
  which currently just throws a GL error and breaks so it's pretty
  important to do something about this before considering the GL3
  driver to be stable.

• GL 3 doesn't support client side vertex buffers. This probably
  doesn't matter because CoglBuffer won't normally use malloc'd
  buffers if VBOs are available, but it might but worth making
  malloc'd buffers a private feature and forcing it not to use them.

• GL 3 doesn't support the default vertex array object. This patch
  just makes it create and bind a single non-default vertex array
  object which gets used just like the normal default object. Ideally
  it would be good to use vertex array objects properly and attach
  them to a CoglPrimitive to cache the state.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 66c9db993595b3a22e63f4c201ea468bc9b88cb6)
2013-01-22 17:48:01 +00:00

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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-debug.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-context-private.h"
#include "cogl-texture-private.h"
#include "cogl-framebuffer-private.h"
#include "cogl-offscreen.h"
/* This is needed to set the color attribute on GLES2 */
#ifdef HAVE_COGL_GLES2
#include "cogl-pipeline-progend-glsl-private.h"
#endif
#include <glib.h>
#include <string.h>
/*
* GL/GLES compatability defines for pipeline thingies:
*/
/* 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_gl_target = 0;
unit->gl_texture = 0;
unit->gl_target = 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_object_unref (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 (ctx, 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,
CoglBool 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 (ctx, 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->gl_target = 0;
unit->dirty_gl_texture = FALSE;
}
}
GE (ctx, 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 is reused again with the same texture unit.
*/
void
_cogl_pipeline_texture_storage_change_notify (CoglTexture *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 &&
_cogl_pipeline_layer_get_texture (unit->layer) == texture)
unit->texture_storage_changed = TRUE;
/* NB: the texture may be bound to multiple texture units so
* we continue to check the rest */
}
}
static void
set_glsl_program (GLuint gl_program)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->current_gl_program != gl_program)
{
GLenum gl_error;
while ((gl_error = ctx->glGetError ()) != GL_NO_ERROR)
;
ctx->glUseProgram (gl_program);
if (ctx->glGetError () == GL_NO_ERROR)
ctx->current_gl_program = gl_program;
else
{
GE( ctx, glUseProgram (0) );
ctx->current_gl_program = 0;
}
}
}
void
_cogl_use_fragment_program (GLuint gl_program, CoglPipelineProgramType type)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* If we're changing program type... */
if (type != ctx->current_fragment_program_type)
{
/* ... disable the old type */
switch (ctx->current_fragment_program_type)
{
case COGL_PIPELINE_PROGRAM_TYPE_GLSL:
/* If the program contains a vertex shader then we shouldn't
disable it */
if (ctx->current_vertex_program_type !=
COGL_PIPELINE_PROGRAM_TYPE_GLSL)
set_glsl_program (0);
break;
case COGL_PIPELINE_PROGRAM_TYPE_ARBFP:
#ifdef HAVE_COGL_GL
GE( ctx, glDisable (GL_FRAGMENT_PROGRAM_ARB) );
#endif
break;
case COGL_PIPELINE_PROGRAM_TYPE_FIXED:
/* don't need to to anything */
break;
}
/* ... and enable the new type */
switch (type)
{
case COGL_PIPELINE_PROGRAM_TYPE_ARBFP:
#ifdef HAVE_COGL_GL
GE( ctx, glEnable (GL_FRAGMENT_PROGRAM_ARB) );
#endif
break;
case COGL_PIPELINE_PROGRAM_TYPE_GLSL:
case COGL_PIPELINE_PROGRAM_TYPE_FIXED:
/* don't need to to anything */
break;
}
}
if (type == COGL_PIPELINE_PROGRAM_TYPE_GLSL)
{
#ifdef COGL_PIPELINE_FRAGEND_GLSL
set_glsl_program (gl_program);
#else
g_warning ("Unexpected use of GLSL fragend!");
#endif /* COGL_PIPELINE_FRAGEND_GLSL */
}
#ifndef COGL_PIPELINE_FRAGEND_ARBFP
else if (type == COGL_PIPELINE_PROGRAM_TYPE_ARBFP)
g_warning ("Unexpected use of ARBFP fragend!");
#endif /* COGL_PIPELINE_FRAGEND_ARBFP */
ctx->current_fragment_program_type = type;
}
void
_cogl_use_vertex_program (GLuint gl_program, CoglPipelineProgramType type)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* If we're changing program type... */
if (type != ctx->current_vertex_program_type)
{
/* ... disable the old type */
switch (ctx->current_vertex_program_type)
{
case COGL_PIPELINE_PROGRAM_TYPE_GLSL:
/* If the program contains a fragment shader then we shouldn't
disable it */
if (ctx->current_fragment_program_type !=
COGL_PIPELINE_PROGRAM_TYPE_GLSL)
set_glsl_program (0);
break;
case COGL_PIPELINE_PROGRAM_TYPE_ARBFP:
/* It doesn't make sense to enable ARBfp for the vertex program */
g_assert_not_reached ();
break;
case COGL_PIPELINE_PROGRAM_TYPE_FIXED:
/* don't need to to anything */
break;
}
/* ... and enable the new type */
switch (type)
{
case COGL_PIPELINE_PROGRAM_TYPE_ARBFP:
/* It doesn't make sense to enable ARBfp for the vertex program */
g_assert_not_reached ();
break;
case COGL_PIPELINE_PROGRAM_TYPE_GLSL:
case COGL_PIPELINE_PROGRAM_TYPE_FIXED:
/* don't need to to anything */
break;
}
}
if (type == COGL_PIPELINE_PROGRAM_TYPE_GLSL)
{
#ifdef COGL_PIPELINE_VERTEND_GLSL
set_glsl_program (gl_program);
#else
g_warning ("Unexpected use of GLSL vertend!");
#endif /* COGL_PIPELINE_VERTEND_GLSL */
}
#ifndef COGL_PIPELINE_VERTEND_ARBFP
else if (type == COGL_PIPELINE_PROGRAM_TYPE_ARBFP)
g_warning ("Unexpected use of ARBFP vertend!");
#endif /* COGL_PIPELINE_VERTEND_ARBFP */
ctx->current_vertex_program_type = type;
}
#if defined(HAVE_COGL_GLES2) || defined(HAVE_COGL_GL)
static CoglBool
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 (CoglContext *ctx,
CoglDepthState *depth_state)
{
if (ctx->depth_test_enabled_cache != depth_state->test_enabled)
{
if (depth_state->test_enabled == TRUE)
GE (ctx, glEnable (GL_DEPTH_TEST));
else
GE (ctx, glDisable (GL_DEPTH_TEST));
ctx->depth_test_enabled_cache = depth_state->test_enabled;
}
if (ctx->depth_test_function_cache != depth_state->test_function &&
depth_state->test_enabled == TRUE)
{
GE (ctx, glDepthFunc (depth_state->test_function));
ctx->depth_test_function_cache = depth_state->test_function;
}
if (ctx->depth_writing_enabled_cache != depth_state->write_enabled)
{
GE (ctx, glDepthMask (depth_state->write_enabled ?
GL_TRUE : GL_FALSE));
ctx->depth_writing_enabled_cache = depth_state->write_enabled;
}
if (ctx->driver != COGL_DRIVER_GLES1 &&
(ctx->depth_range_near_cache != depth_state->range_near ||
ctx->depth_range_far_cache != depth_state->range_far))
{
if (ctx->driver == COGL_DRIVER_GLES2)
GE (ctx, glDepthRangef (depth_state->range_near,
depth_state->range_far));
else
GE (ctx, glDepthRange (depth_state->range_near,
depth_state->range_far));
ctx->depth_range_near_cache = depth_state->range_near;
ctx->depth_range_far_cache = depth_state->range_far;
}
}
static void
_cogl_pipeline_flush_color_blend_alpha_depth_state (
CoglPipeline *pipeline,
unsigned long pipelines_difference,
CoglBool skip_gl_color)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* On GLES2 we'll flush the color later */
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_FIXED_FUNCTION) &&
!skip_gl_color)
{
if ((pipelines_difference & COGL_PIPELINE_STATE_COLOR) ||
/* Assume if we were previously told to skip the color, then
* the current color needs updating... */
ctx->current_pipeline_skip_gl_color)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_COLOR);
GE (ctx, 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 (pipelines_difference & COGL_PIPELINE_STATE_BLEND)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_BLEND);
CoglPipelineBlendState *blend_state =
&authority->big_state->blend_state;
/* GLES 1 only has glBlendFunc */
if (ctx->driver == COGL_DRIVER_GLES1)
{
GE (ctx, glBlendFunc (blend_state->blend_src_factor_rgb,
blend_state->blend_dst_factor_rgb));
}
#if defined(HAVE_COGL_GLES2) || defined(HAVE_COGL_GL)
else
{
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 (ctx, glBlendColor (red, green, blue, alpha));
}
if (ctx->glBlendEquationSeparate &&
blend_state->blend_equation_rgb !=
blend_state->blend_equation_alpha)
GE (ctx,
glBlendEquationSeparate (blend_state->blend_equation_rgb,
blend_state->blend_equation_alpha));
else
GE (ctx, glBlendEquation (blend_state->blend_equation_rgb));
if (ctx->glBlendFuncSeparate &&
(blend_state->blend_src_factor_rgb !=
blend_state->blend_src_factor_alpha ||
(blend_state->blend_dst_factor_rgb !=
blend_state->blend_dst_factor_alpha)))
GE (ctx, 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
GE (ctx, glBlendFunc (blend_state->blend_src_factor_rgb,
blend_state->blend_dst_factor_rgb));
}
#endif
}
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_ALPHA_TEST))
{
/* Under GLES2 the alpha function is implemented as part of the
fragment shader */
if (pipelines_difference & (COGL_PIPELINE_STATE_ALPHA_FUNC |
COGL_PIPELINE_STATE_ALPHA_FUNC_REFERENCE))
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_ALPHA_FUNC);
CoglPipelineAlphaFuncState *alpha_state =
&authority->big_state->alpha_state;
/* NB: Currently the Cogl defines are compatible with the GL ones: */
GE (ctx, glAlphaFunc (alpha_state->alpha_func,
alpha_state->alpha_func_reference));
}
/* Under GLES2 the lighting parameters are implemented as uniforms
in the progend */
if (pipelines_difference & COGL_PIPELINE_STATE_LIGHTING)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_LIGHTING);
CoglPipelineLightingState *lighting_state =
&authority->big_state->lighting_state;
GE (ctx, glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT,
lighting_state->ambient));
GE (ctx, glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE,
lighting_state->diffuse));
GE (ctx, glMaterialfv (GL_FRONT_AND_BACK, GL_SPECULAR,
lighting_state->specular));
GE (ctx, glMaterialfv (GL_FRONT_AND_BACK, GL_EMISSION,
lighting_state->emission));
GE (ctx, glMaterialfv (GL_FRONT_AND_BACK, GL_SHININESS,
&lighting_state->shininess));
}
}
#endif
if (pipelines_difference & COGL_PIPELINE_STATE_DEPTH)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_DEPTH);
CoglDepthState *depth_state = &authority->big_state->depth_state;
flush_depth_state (ctx, depth_state);
}
if (pipelines_difference & COGL_PIPELINE_STATE_LOGIC_OPS)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_LOGIC_OPS);
CoglPipelineLogicOpsState *logic_ops_state = &authority->big_state->logic_ops_state;
CoglColorMask color_mask = logic_ops_state->color_mask;
if (ctx->current_draw_buffer)
color_mask &= ctx->current_draw_buffer->color_mask;
GE (ctx, glColorMask (!!(color_mask & COGL_COLOR_MASK_RED),
!!(color_mask & COGL_COLOR_MASK_GREEN),
!!(color_mask & COGL_COLOR_MASK_BLUE),
!!(color_mask & COGL_COLOR_MASK_ALPHA)));
ctx->current_gl_color_mask = color_mask;
}
if (pipelines_difference & COGL_PIPELINE_STATE_CULL_FACE)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_CULL_FACE);
CoglPipelineCullFaceState *cull_face_state
= &authority->big_state->cull_face_state;
if (cull_face_state->mode == COGL_PIPELINE_CULL_FACE_MODE_NONE)
GE( ctx, glDisable (GL_CULL_FACE) );
else
{
CoglBool invert_winding;
GE( ctx, glEnable (GL_CULL_FACE) );
switch (cull_face_state->mode)
{
case COGL_PIPELINE_CULL_FACE_MODE_NONE:
g_assert_not_reached ();
case COGL_PIPELINE_CULL_FACE_MODE_FRONT:
GE( ctx, glCullFace (GL_FRONT) );
break;
case COGL_PIPELINE_CULL_FACE_MODE_BACK:
GE( ctx, glCullFace (GL_BACK) );
break;
case COGL_PIPELINE_CULL_FACE_MODE_BOTH:
GE( ctx, glCullFace (GL_FRONT_AND_BACK) );
break;
}
/* If we are painting to an offscreen framebuffer then we
need to invert the winding of the front face because
everything is painted upside down */
invert_winding = cogl_is_offscreen (ctx->current_draw_buffer);
switch (cull_face_state->front_winding)
{
case COGL_WINDING_CLOCKWISE:
GE( ctx, glFrontFace (invert_winding ? GL_CCW : GL_CW) );
break;
case COGL_WINDING_COUNTER_CLOCKWISE:
GE( ctx, glFrontFace (invert_winding ? GL_CW : GL_CCW) );
break;
}
}
}
if (pipeline->real_blend_enable != ctx->gl_blend_enable_cache)
{
if (pipeline->real_blend_enable)
GE (ctx, glEnable (GL_BLEND));
else
GE (ctx, glDisable (GL_BLEND));
/* XXX: we shouldn't update any other blend state if blending
* is disabled! */
ctx->gl_blend_enable_cache = pipeline->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))
{
GLint values[3];
int n_values = 0;
int i;
#ifdef HAVE_COGL_GL
if (ctx->driver == COGL_DRIVER_GL ||
ctx->driver == COGL_DRIVER_GL3)
{
/* GL_MAX_TEXTURE_COORDS is provided for both GLSL and ARBfp. It
defines the number of texture coordinates that can be
uploaded (but doesn't necessarily relate to how many texture
images can be sampled) */
if (cogl_has_feature (ctx, COGL_FEATURE_ID_GLSL) ||
cogl_has_feature (ctx, COGL_FEATURE_ID_ARBFP))
/* Previously this code subtracted the value by one but there
was no explanation for why it did this and it doesn't seem
to make sense so it has been removed */
GE (ctx, glGetIntegerv (GL_MAX_TEXTURE_COORDS,
values + n_values++));
/* GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS is defined for GLSL but
not ARBfp */
if (cogl_has_feature (ctx, COGL_FEATURE_ID_GLSL))
GE (ctx, glGetIntegerv (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,
values + n_values++));
}
#endif /* HAVE_COGL_GL */
#ifdef HAVE_COGL_GLES2
if (ctx->driver == COGL_DRIVER_GLES2)
{
GE (ctx, glGetIntegerv (GL_MAX_VERTEX_ATTRIBS, values + n_values));
/* Two of the vertex attribs need to be used for the position
and color */
values[n_values++] -= 2;
GE (ctx, glGetIntegerv (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,
values + n_values++));
}
#endif
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES) /* not GLES2 */
if (ctx->driver != COGL_DRIVER_GLES2)
{
/* GL_MAX_TEXTURE_UNITS defines the number of units that are
usable from the fixed function pipeline, therefore it isn't
available in GLES2. These are also tied to the number of
texture coordinates that can be uploaded so it should be less
than that available from the shader extensions */
GE (ctx, glGetIntegerv (GL_MAX_TEXTURE_UNITS,
values + n_values++));
}
#endif
g_assert (n_values <= G_N_ELEMENTS (values) &&
n_values > 0);
/* Use the maximum value */
ctx->max_activateable_texture_units = values[0];
for (i = 1; i < n_values; i++)
ctx->max_activateable_texture_units =
MAX (values[i], ctx->max_activateable_texture_units);
}
return ctx->max_activateable_texture_units;
}
typedef struct
{
int i;
unsigned long *layer_differences;
} CoglPipelineFlushLayerState;
static CoglBool
flush_layers_common_gl_state_cb (CoglPipelineLayer *layer, void *user_data)
{
CoglPipelineFlushLayerState *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];
_COGL_GET_CONTEXT (ctx, FALSE);
/* 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 CoglBool 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_PIPELINE_LAYER_STATE_TEXTURE_DATA)
{
CoglTexture *texture = _cogl_pipeline_layer_get_texture_real (layer);
GLuint gl_texture;
GLenum gl_target;
if (texture == NULL)
switch (_cogl_pipeline_layer_get_texture_type (layer))
{
case COGL_TEXTURE_TYPE_2D:
texture = COGL_TEXTURE (ctx->default_gl_texture_2d_tex);
break;
case COGL_TEXTURE_TYPE_3D:
texture = COGL_TEXTURE (ctx->default_gl_texture_3d_tex);
break;
case COGL_TEXTURE_TYPE_RECTANGLE:
texture = COGL_TEXTURE (ctx->default_gl_texture_rect_tex);
break;
}
cogl_texture_get_gl_texture (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_pipeline_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)
unit->dirty_gl_texture = TRUE;
else
GE (ctx, glBindTexture (gl_target, gl_texture));
unit->gl_texture = gl_texture;
unit->gl_target = gl_target;
}
unit->is_foreign = _cogl_texture_is_foreign (texture);
/* 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;
}
if ((layers_difference & COGL_PIPELINE_LAYER_STATE_SAMPLER) &&
(ctx->private_feature_flags & COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS))
{
const CoglSamplerCacheEntry *sampler_state;
sampler_state = _cogl_pipeline_layer_get_sampler_state (layer);
GE( ctx, glBindSampler (unit_index, sampler_state->sampler_object) );
}
/* FIXME: If using GLSL the progend we will use gl_PointCoord
* instead of us needing to replace the texture coordinates but at
* this point we can't currently tell if we are using the fixed or
* glsl progend.
*/
#if defined (HAVE_COGL_GLES) || defined (HAVE_COGL_GL)
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_FIXED_FUNCTION) &&
(layers_difference & COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS))
{
CoglPipelineState change = COGL_PIPELINE_LAYER_STATE_POINT_SPRITE_COORDS;
CoglPipelineLayer *authority =
_cogl_pipeline_layer_get_authority (layer, change);
CoglPipelineLayerBigState *big_state = authority->big_state;
_cogl_set_active_texture_unit (unit_index);
GE (ctx, glTexEnvi (GL_POINT_SPRITE, GL_COORD_REPLACE,
big_state->point_sprite_coords));
}
#endif
cogl_object_ref (layer);
if (unit->layer != NULL)
cogl_object_unref (unit->layer);
unit->layer = layer;
unit->layer_changes_since_flush = 0;
flush_state->i++;
return TRUE;
}
static void
_cogl_pipeline_flush_common_gl_state (CoglPipeline *pipeline,
unsigned long pipelines_difference,
unsigned long *layer_differences,
CoglBool skip_gl_color)
{
CoglPipelineFlushLayerState state;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_pipeline_flush_color_blend_alpha_depth_state (pipeline,
pipelines_difference,
skip_gl_color);
state.i = 0;
state.layer_differences = layer_differences;
_cogl_pipeline_foreach_layer_internal (pipeline,
flush_layers_common_gl_state_cb,
&state);
}
/* 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_pipeline_layer_forward_wrap_modes (CoglPipelineLayer *layer,
CoglTexture *texture)
{
CoglSamplerCacheWrapMode wrap_mode_s, wrap_mode_t, wrap_mode_p;
GLenum gl_wrap_mode_s, gl_wrap_mode_t, gl_wrap_mode_p;
if (texture == NULL)
return;
_cogl_pipeline_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_SAMPLER_CACHE_WRAP_MODE_AUTOMATIC)
gl_wrap_mode_s = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_s = wrap_mode_s;
if (wrap_mode_t == COGL_SAMPLER_CACHE_WRAP_MODE_AUTOMATIC)
gl_wrap_mode_t = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_t = wrap_mode_t;
if (wrap_mode_p == COGL_SAMPLER_CACHE_WRAP_MODE_AUTOMATIC)
gl_wrap_mode_p = GL_CLAMP_TO_EDGE;
else
gl_wrap_mode_p = wrap_mode_p;
_cogl_texture_gl_flush_legacy_texobj_wrap_modes (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 pipelines with different modes.
*
* This function is bypassed in favour of sampler objects if
* GL_ARB_sampler_objects is advertised. This fallback won't work if
* the same texture is bound to multiple layers with different sampler
* state.
*/
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->layer)
{
CoglTexture *texture = _cogl_pipeline_layer_get_texture (unit->layer);
if (texture != NULL)
{
CoglPipelineFilter min;
CoglPipelineFilter mag;
_cogl_pipeline_layer_get_filters (unit->layer, &min, &mag);
_cogl_texture_gl_flush_legacy_texobj_filters (texture, min, mag);
_cogl_pipeline_layer_forward_wrap_modes (unit->layer, texture);
}
}
}
}
typedef struct
{
int i;
unsigned long *layer_differences;
} CoglPipelineCompareLayersState;
static CoglBool
compare_layer_differences_cb (CoglPipelineLayer *layer, void *user_data)
{
CoglPipelineCompareLayersState *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_pipeline_layer_compare_differences (layer, unit->layer);
}
else
state->layer_differences[state->i] = COGL_PIPELINE_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_pipeline_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_PIPELINE_LAYER_STATE_TEXTURE_DATA;
state->i++;
return TRUE;
}
typedef struct
{
CoglFramebuffer *framebuffer;
const CoglPipelineVertend *vertend;
const CoglPipelineFragend *fragend;
CoglPipeline *pipeline;
unsigned long *layer_differences;
CoglBool error_adding_layer;
CoglBool added_layer;
} CoglPipelineAddLayerState;
static CoglBool
vertend_add_layer_cb (CoglPipelineLayer *layer,
void *user_data)
{
CoglPipelineAddLayerState *state = user_data;
const CoglPipelineVertend *vertend = state->vertend;
CoglPipeline *pipeline = state->pipeline;
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
/* Either generate per layer code snippets or setup the
* fixed function glTexEnv for each layer... */
if (G_LIKELY (vertend->add_layer (pipeline,
layer,
state->layer_differences[unit_index],
state->framebuffer)))
state->added_layer = TRUE;
else
{
state->error_adding_layer = TRUE;
return FALSE;
}
return TRUE;
}
static CoglBool
fragend_add_layer_cb (CoglPipelineLayer *layer,
void *user_data)
{
CoglPipelineAddLayerState *state = user_data;
const CoglPipelineFragend *fragend = state->fragend;
CoglPipeline *pipeline = state->pipeline;
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
/* Either generate per layer code snippets or setup the
* fixed function glTexEnv for each layer... */
if (G_LIKELY (fragend->add_layer (pipeline,
layer,
state->layer_differences[unit_index])))
state->added_layer = TRUE;
else
{
state->error_adding_layer = TRUE;
return FALSE;
}
return TRUE;
}
/*
* _cogl_pipeline_flush_gl_state:
*
* Details of override options:
* ->fallback_mask: is a bitmask of the pipeline 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 pipeline 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 pipeline
* 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_pipeline_flush_gl_state (CoglPipeline *pipeline,
CoglFramebuffer *framebuffer,
CoglBool skip_gl_color,
int n_tex_coord_attribs)
{
unsigned long pipelines_difference;
int n_layers;
unsigned long *layer_differences;
int i;
CoglTextureUnit *unit1;
const CoglPipelineProgend *progend;
COGL_STATIC_TIMER (pipeline_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, pipeline_flush_timer);
if (ctx->current_pipeline == pipeline)
{
/* Bail out asap if we've been asked to re-flush the already current
* pipeline and we can see the pipeline hasn't changed */
if (ctx->current_pipeline_age == pipeline->age &&
ctx->current_pipeline_skip_gl_color == skip_gl_color)
goto done;
pipelines_difference = ctx->current_pipeline_changes_since_flush;
}
else if (ctx->current_pipeline)
{
pipelines_difference = ctx->current_pipeline_changes_since_flush;
pipelines_difference |=
_cogl_pipeline_compare_differences (ctx->current_pipeline,
pipeline);
}
else
pipelines_difference = COGL_PIPELINE_STATE_ALL_SPARSE;
/* Get a layer_differences mask for each layer to be flushed */
n_layers = cogl_pipeline_get_n_layers (pipeline);
if (n_layers)
{
CoglPipelineCompareLayersState 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_pipeline_foreach_layer_internal (pipeline,
compare_layer_differences_cb,
&state);
}
else
layer_differences = NULL;
/* Make sure we generate the texture coordinate array to be at least
the number of layers. This is important because the vertend will
try to pass along the corresponding varying for each layer
regardless of whether the fragment shader is actually using
it. Also it is possible that the application is assuming that if
the attribute isn't passed then it will default to 0,0. This is
what test-cogl-primitive does */
if (n_layers > n_tex_coord_attribs)
n_tex_coord_attribs = n_layers;
/* First flush everything that's the same regardless of which
* pipeline 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
*
* Note: After _cogl_pipeline_flush_common_gl_state you can expect
* all state of the layers corresponding texture unit to be
* updated.
*/
_cogl_pipeline_flush_common_gl_state (pipeline,
pipelines_difference,
layer_differences,
skip_gl_color);
/* Now flush the fragment, vertex and program state according to the
* current progend backend.
*
* Note: Some backends may not support the current pipeline
* configuration and in that case it will report and error and we
* will look for a different backend.
*
* NB: if pipeline->progend != COGL_PIPELINE_PROGEND_UNDEFINED then
* we have previously managed to successfully flush this pipeline
* with the given progend so we will simply use that to avoid
* fallback code paths.
*/
if (pipeline->progend == COGL_PIPELINE_PROGEND_UNDEFINED)
_cogl_pipeline_set_progend (pipeline, COGL_PIPELINE_PROGEND_DEFAULT);
for (i = pipeline->progend;
i < COGL_PIPELINE_N_PROGENDS;
i++, _cogl_pipeline_set_progend (pipeline, i))
{
const CoglPipelineVertend *vertend;
const CoglPipelineFragend *fragend;
CoglPipelineAddLayerState state;
progend = _cogl_pipeline_progends[i];
if (G_UNLIKELY (!progend->start (pipeline)))
continue;
vertend = _cogl_pipeline_vertends[progend->vertend];
vertend->start (pipeline,
n_layers,
pipelines_difference,
n_tex_coord_attribs);
state.framebuffer = framebuffer;
state.vertend = vertend;
state.pipeline = pipeline;
state.layer_differences = layer_differences;
state.error_adding_layer = FALSE;
state.added_layer = FALSE;
_cogl_pipeline_foreach_layer_internal (pipeline,
vertend_add_layer_cb,
&state);
if (G_UNLIKELY (state.error_adding_layer))
continue;
if (G_UNLIKELY (!vertend->end (pipeline, pipelines_difference)))
continue;
/* Now prepare the fragment processing state (fragend)
*
* NB: We can't combine the setup of the vertend and fragend
* since the backends that do code generation share
* ctx->codegen_source_buffer as a scratch buffer.
*/
fragend = _cogl_pipeline_fragends[progend->fragend];
state.fragend = fragend;
fragend->start (pipeline,
n_layers,
pipelines_difference,
n_tex_coord_attribs);
_cogl_pipeline_foreach_layer_internal (pipeline,
fragend_add_layer_cb,
&state);
if (G_UNLIKELY (state.error_adding_layer))
continue;
if (!state.added_layer)
{
if (fragend->passthrough &&
G_UNLIKELY (!fragend->passthrough (pipeline)))
continue;
}
if (G_UNLIKELY (!fragend->end (pipeline, pipelines_difference)))
continue;
if (progend->end)
progend->end (pipeline, pipelines_difference, n_tex_coord_attribs);
break;
}
/* FIXME: This reference is actually resulting in lots of
* copy-on-write reparenting because one-shot pipelines 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 pipelines for overrides.
*/
cogl_object_ref (pipeline);
if (ctx->current_pipeline != NULL)
cogl_object_unref (ctx->current_pipeline);
ctx->current_pipeline = pipeline;
ctx->current_pipeline_changes_since_flush = 0;
ctx->current_pipeline_skip_gl_color = skip_gl_color;
ctx->current_pipeline_age = pipeline->age;
done:
progend = _cogl_pipeline_progends[pipeline->progend];
/* We can't assume the color will be retained between flushes when
* using the glsl progend because the generic attribute values are
* not stored as part of the program object so they could be
* overridden by any attribute changes in another program */
if (pipeline->progend == COGL_PIPELINE_PROGEND_GLSL && !skip_gl_color)
{
int attribute;
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_COLOR);
int name_index = COGL_ATTRIBUTE_COLOR_NAME_INDEX;
attribute =
_cogl_pipeline_progend_glsl_get_attrib_location (pipeline, name_index);
if (attribute != -1)
GE (ctx,
glVertexAttrib4f (attribute,
cogl_color_get_red_float (&authority->color),
cogl_color_get_green_float (&authority->color),
cogl_color_get_blue_float (&authority->color),
cogl_color_get_alpha_float (&authority->color)));
}
/* Give the progend a chance to update any uniforms that might not
* depend on the material state. This is used on GLES2 to update the
* matrices */
if (progend->pre_paint)
progend->pre_paint (pipeline, framebuffer);
/* Handle the fact that OpenGL associates texture filter and wrap
* modes with the texture objects not the texture units... */
if (!(ctx->private_feature_flags & COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS))
foreach_texture_unit_update_filter_and_wrap_modes ();
/* If this pipeline 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-pipeline.c (See
* _cogl_bind_gl_texture_transient)
*/
unit1 = _cogl_get_texture_unit (1);
if (cogl_pipeline_get_n_layers (pipeline) > 1 && unit1->dirty_gl_texture)
{
_cogl_set_active_texture_unit (1);
GE (ctx, glBindTexture (unit1->gl_target, unit1->gl_texture));
unit1->dirty_gl_texture = FALSE;
}
COGL_TIMER_STOP (_cogl_uprof_context, pipeline_flush_timer);
}
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