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mutter/cogl/cogl-pipeline-fragend-glsl.c
Neil Roberts b2e735ff7f Dynamically load the GL or GLES library 
The GL or GLES library is now dynamically loaded by the CoglRenderer
so that it can choose between GL, GLES1 and GLES2 at runtime. The
library is loaded by the renderer because it needs to be done before
calling eglInitialize. There is a new environment variable called
COGL_DRIVER to choose between gl, gles1 or gles2.

The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have
been changed so that they don't assume the ifdefs are mutually
exclusive. They haven't been removed entirely so that it's possible to
compile the GLES backends without the the enums from the GL headers.

When using GLX the winsys additionally dynamically loads libGL because
that also contains the GLX API. It can't be linked in directly because
that would probably conflict with the GLES API if the EGL is
selected. When compiling with EGL support the library links directly
to libEGL because it doesn't contain any GL API so it shouldn't have
any conflicts.

When building for WGL or OSX Cogl still directly links against the GL
API so there is a #define in config.h so that Cogl won't try to dlopen
the library.

Cogl-pango previously had a #ifdef to detect when the GL backend is
used so that it can sneakily pass GL_QUADS to
cogl_vertex_buffer_draw. This is now changed so that it queries the
CoglContext for the backend. However to get this to work Cogl now
needs to export the _cogl_context_get_default symbol and cogl-pango
needs some extra -I flags to so that it can include
cogl-context-private.h
2011-07-11 12:57:38 +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>
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl-pipeline-private.h"
#include "cogl-shader-private.h"
#include "cogl-blend-string.h"
#ifdef COGL_PIPELINE_FRAGEND_GLSL
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-shader-private.h"
#include "cogl-program-private.h"
#include <glib.h>
/*
* GL/GLES compatability defines for pipeline thingies:
*/
/* This might not be defined on GLES */
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
typedef struct _UnitState
{
unsigned int sampled:1;
unsigned int combine_constant_used:1;
} UnitState;
typedef struct _GlslShaderState
{
int ref_count;
GLuint gl_shader;
GString *header, *source;
UnitState *unit_state;
/* Age of the user program that was current when the shader was
generated. We need to keep track of this because if the user
program changes then we may need to redecide whether to generate
a shader at all */
unsigned int user_program_age;
} GlslShaderState;
typedef struct _CoglPipelineFragendGlslPrivate
{
GlslShaderState *glsl_shader_state;
} CoglPipelineFragendGlslPrivate;
const CoglPipelineFragend _cogl_pipeline_glsl_backend;
static GlslShaderState *
glsl_shader_state_new (int n_layers)
{
GlslShaderState *state = g_slice_new0 (GlslShaderState);
state->ref_count = 1;
state->unit_state = g_new0 (UnitState, n_layers);
return state;
}
static GlslShaderState *
glsl_shader_state_ref (GlslShaderState *state)
{
state->ref_count++;
return state;
}
void
glsl_shader_state_unref (GlslShaderState *state)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
g_return_if_fail (state->ref_count > 0);
state->ref_count--;
if (state->ref_count == 0)
{
if (state->gl_shader)
GE( ctx, glDeleteShader (state->gl_shader) );
g_free (state->unit_state);
g_slice_free (GlslShaderState, state);
}
}
static CoglPipelineFragendGlslPrivate *
get_glsl_priv (CoglPipeline *pipeline)
{
if (!(pipeline->fragend_priv_set_mask & COGL_PIPELINE_FRAGEND_GLSL_MASK))
return NULL;
return pipeline->fragend_privs[COGL_PIPELINE_FRAGEND_GLSL];
}
static void
set_glsl_priv (CoglPipeline *pipeline, CoglPipelineFragendGlslPrivate *priv)
{
if (priv)
{
pipeline->fragend_privs[COGL_PIPELINE_FRAGEND_GLSL] = priv;
pipeline->fragend_priv_set_mask |= COGL_PIPELINE_FRAGEND_GLSL_MASK;
}
else
pipeline->fragend_priv_set_mask &= ~COGL_PIPELINE_FRAGEND_GLSL_MASK;
}
static GlslShaderState *
get_glsl_shader_state (CoglPipeline *pipeline)
{
CoglPipelineFragendGlslPrivate *priv = get_glsl_priv (pipeline);
if (!priv)
return NULL;
return priv->glsl_shader_state;
}
GLuint
_cogl_pipeline_fragend_glsl_get_shader (CoglPipeline *pipeline)
{
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
if (glsl_shader_state)
return glsl_shader_state->gl_shader;
else
return 0;
}
static void
dirty_glsl_shader_state (CoglPipeline *pipeline)
{
CoglPipelineFragendGlslPrivate *priv;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
priv = get_glsl_priv (pipeline);
if (!priv)
return;
if (priv->glsl_shader_state)
{
glsl_shader_state_unref (priv->glsl_shader_state);
priv->glsl_shader_state = NULL;
}
}
static gboolean
_cogl_pipeline_fragend_glsl_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference,
int n_tex_coord_attribs)
{
CoglPipelineFragendGlslPrivate *priv;
CoglPipeline *authority;
CoglPipelineFragendGlslPrivate *authority_priv;
CoglProgram *user_program;
int i;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_features_available (COGL_FEATURE_SHADERS_GLSL))
return FALSE;
user_program = cogl_pipeline_get_user_program (pipeline);
/* If the user fragment shader isn't GLSL then we should let
another backend handle it */
if (user_program &&
_cogl_program_has_fragment_shader (user_program) &&
_cogl_program_get_language (user_program) != COGL_SHADER_LANGUAGE_GLSL)
return FALSE;
/* Now lookup our glsl backend private state (allocating if
* necessary) */
priv = get_glsl_priv (pipeline);
if (!priv)
{
priv = g_slice_new0 (CoglPipelineFragendGlslPrivate);
set_glsl_priv (pipeline, priv);
}
if (!priv->glsl_shader_state)
{
/* If we don't have an associated glsl shader yet then find the
* glsl-authority (the oldest ancestor whose state will result in
* the same shader being generated as for this pipeline).
*
* We always make sure to associate new shader with the
* glsl-authority to maximize the chance that other pipelines can
* share it.
*/
authority = _cogl_pipeline_find_equivalent_parent
(pipeline,
_cogl_pipeline_get_state_for_fragment_codegen (ctx) &
~COGL_PIPELINE_STATE_LAYERS,
_cogl_pipeline_get_layer_state_for_fragment_codegen (ctx));
authority_priv = get_glsl_priv (authority);
if (!authority_priv)
{
authority_priv = g_slice_new0 (CoglPipelineFragendGlslPrivate);
set_glsl_priv (authority, authority_priv);
}
/* If we don't have an existing program associated with the
* glsl-authority then start generating code for a new shader...
*/
if (!authority_priv->glsl_shader_state)
{
GlslShaderState *glsl_shader_state =
glsl_shader_state_new (n_layers);
authority_priv->glsl_shader_state = glsl_shader_state;
}
/* If the pipeline isn't actually its own glsl-authority
* then take a reference to the program state associated
* with the glsl-authority... */
if (authority != pipeline)
priv->glsl_shader_state =
glsl_shader_state_ref (authority_priv->glsl_shader_state);
}
if (priv->glsl_shader_state->gl_shader)
{
/* If we already have a valid GLSL shader then we don't need to
generate a new one. However if there's a user program and it
has changed since the last link then we do need a new shader */
if (user_program == NULL ||
(priv->glsl_shader_state->user_program_age == user_program->age))
return TRUE;
/* We need to recreate the shader so destroy the existing one */
GE( ctx, glDeleteShader (priv->glsl_shader_state->gl_shader) );
priv->glsl_shader_state->gl_shader = 0;
}
/* If we make it here then we have a glsl_shader_state struct
without a gl_shader either because this is the first time we've
encountered it or because the user program has changed */
if (user_program)
priv->glsl_shader_state->user_program_age = user_program->age;
/* If the user program contains a fragment shader then we don't need
to generate one */
if (user_program &&
_cogl_program_has_fragment_shader (user_program))
return TRUE;
/* We reuse two grow-only GStrings for code-gen. One string
contains the uniform and attribute declarations while the
other contains the main function. We need two strings
because we need to dynamically declare attributes as the
add_layer callback is invoked */
g_string_set_size (ctx->codegen_header_buffer, 0);
g_string_set_size (ctx->codegen_source_buffer, 0);
priv->glsl_shader_state->header = ctx->codegen_header_buffer;
priv->glsl_shader_state->source = ctx->codegen_source_buffer;
g_string_append (priv->glsl_shader_state->source,
"void\n"
"main ()\n"
"{\n");
for (i = 0; i < n_layers; i++)
{
priv->glsl_shader_state->unit_state[i].sampled = FALSE;
priv->glsl_shader_state->unit_state[i].combine_constant_used = FALSE;
}
return TRUE;
}
static void
add_constant_lookup (GlslShaderState *glsl_shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle)
{
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
/* Create a sampler uniform for this layer if we haven't already */
if (!glsl_shader_state->unit_state[unit_index].combine_constant_used)
{
g_string_append_printf (glsl_shader_state->header,
"uniform vec4 _cogl_layer_constant_%i;\n",
unit_index);
glsl_shader_state->unit_state[unit_index].combine_constant_used = TRUE;
}
g_string_append_printf (glsl_shader_state->source,
"_cogl_layer_constant_%i.%s",
unit_index, swizzle);
}
static void
add_texture_lookup (GlslShaderState *glsl_shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle)
{
CoglHandle texture;
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
const char *target_string, *tex_coord_swizzle;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_DISABLE_TEXTURING)))
{
g_string_append (glsl_shader_state->source,
"vec4 (1.0, 1.0, 1.0, 1.0).");
g_string_append (glsl_shader_state->source, swizzle);
return;
}
texture = _cogl_pipeline_layer_get_texture (layer);
if (texture == COGL_INVALID_HANDLE)
{
target_string = "2D";
tex_coord_swizzle = "st";
}
else
{
GLenum gl_target;
cogl_texture_get_gl_texture (texture, NULL, &gl_target);
switch (gl_target)
{
#ifdef HAVE_COGL_GL
case GL_TEXTURE_1D:
target_string = "1D";
tex_coord_swizzle = "s";
break;
#endif
case GL_TEXTURE_2D:
target_string = "2D";
tex_coord_swizzle = "st";
break;
#ifdef GL_ARB_texture_rectangle
case GL_TEXTURE_RECTANGLE_ARB:
target_string = "2DRect";
tex_coord_swizzle = "st";
break;
#endif
case GL_TEXTURE_3D:
target_string = "3D";
tex_coord_swizzle = "stp";
break;
default:
g_assert_not_reached ();
}
}
/* Create a sampler uniform for this layer if we haven't already */
if (!glsl_shader_state->unit_state[unit_index].sampled)
{
g_string_append_printf (glsl_shader_state->header,
"uniform sampler%s _cogl_sampler_%i;\n",
target_string,
unit_index);
glsl_shader_state->unit_state[unit_index].sampled = TRUE;
}
g_string_append_printf (glsl_shader_state->source,
"texture%s (_cogl_sampler_%i, ",
target_string, unit_index);
/* If point sprite coord generation is being used then divert to the
built-in varying var for that instead of the texture
coordinates. We don't want to do this under GL because in that
case we will instead use glTexEnv(GL_COORD_REPLACE) to replace
the texture coords with the point sprite coords. Although GL also
supports the gl_PointCoord variable, it requires GLSL 1.2 which
would mean we would have to declare the GLSL version and check
for it */
if (ctx->driver == COGL_DRIVER_GLES2 &&
cogl_pipeline_get_layer_point_sprite_coords_enabled (pipeline,
layer->index))
g_string_append_printf (glsl_shader_state->source,
"gl_PointCoord.%s",
tex_coord_swizzle);
else
g_string_append_printf (glsl_shader_state->source,
"cogl_tex_coord_in[%d].%s",
unit_index, tex_coord_swizzle);
g_string_append_printf (glsl_shader_state->source, ").%s", swizzle);
}
typedef struct
{
int unit_index;
CoglPipelineLayer *layer;
} FindPipelineLayerData;
static gboolean
find_pipeline_layer_cb (CoglPipelineLayer *layer,
void *user_data)
{
FindPipelineLayerData *data = user_data;
int unit_index;
unit_index = _cogl_pipeline_layer_get_unit_index (layer);
if (unit_index == data->unit_index)
{
data->layer = layer;
return FALSE;
}
return TRUE;
}
static void
add_arg (GlslShaderState *glsl_shader_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
CoglPipelineCombineSource src,
CoglPipelineCombineOp operand,
const char *swizzle)
{
GString *shader_source = glsl_shader_state->source;
char alpha_swizzle[5] = "aaaa";
g_string_append_c (shader_source, '(');
if (operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_COLOR ||
operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_ALPHA)
g_string_append_printf (shader_source,
"vec4(1.0, 1.0, 1.0, 1.0).%s - ",
swizzle);
/* If the operand is reading from the alpha then replace the swizzle
with the same number of copies of the alpha */
if (operand == COGL_PIPELINE_COMBINE_OP_SRC_ALPHA ||
operand == COGL_PIPELINE_COMBINE_OP_ONE_MINUS_SRC_ALPHA)
{
alpha_swizzle[strlen (swizzle)] = '\0';
swizzle = alpha_swizzle;
}
switch (src)
{
case COGL_PIPELINE_COMBINE_SOURCE_TEXTURE:
add_texture_lookup (glsl_shader_state,
pipeline,
layer,
swizzle);
break;
case COGL_PIPELINE_COMBINE_SOURCE_CONSTANT:
add_constant_lookup (glsl_shader_state,
pipeline,
layer,
swizzle);
break;
case COGL_PIPELINE_COMBINE_SOURCE_PREVIOUS:
if (_cogl_pipeline_layer_get_unit_index (layer) > 0)
{
g_string_append_printf (shader_source, "cogl_color_out.%s", swizzle);
break;
}
/* flow through */
case COGL_PIPELINE_COMBINE_SOURCE_PRIMARY_COLOR:
g_string_append_printf (shader_source, "cogl_color_in.%s", swizzle);
break;
default:
if (src >= COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 &&
src < COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0 + 32)
{
FindPipelineLayerData data;
data.unit_index = src - COGL_PIPELINE_COMBINE_SOURCE_TEXTURE0;
data.layer = layer;
_cogl_pipeline_foreach_layer_internal (pipeline,
find_pipeline_layer_cb,
&data);
add_texture_lookup (glsl_shader_state,
pipeline,
data.layer,
swizzle);
}
break;
}
g_string_append_c (shader_source, ')');
}
static void
append_masked_combine (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle,
CoglPipelineCombineFunc function,
CoglPipelineCombineSource *src,
CoglPipelineCombineOp *op)
{
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
GString *shader_source = glsl_shader_state->source;
g_string_append_printf (glsl_shader_state->source,
" cogl_color_out.%s = ", swizzle);
switch (function)
{
case COGL_PIPELINE_COMBINE_FUNC_REPLACE:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_MODULATE:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_ADD:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_ADD_SIGNED:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], swizzle);
g_string_append_printf (shader_source,
" - vec4(0.5, 0.5, 0.5, 0.5).%s",
swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_SUBTRACT:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " - ");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case COGL_PIPELINE_COMBINE_FUNC_INTERPOLATE:
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (glsl_shader_state, pipeline, layer,
src[2], op[2], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], swizzle);
g_string_append_printf (shader_source,
" * (vec4(1.0, 1.0, 1.0, 1.0).%s - ",
swizzle);
add_arg (glsl_shader_state, pipeline, layer,
src[2], op[2], swizzle);
g_string_append_c (shader_source, ')');
break;
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGB:
case COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA:
g_string_append (shader_source, "vec4(4.0 * ((");
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], "r");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], "r");
g_string_append (shader_source, " - 0.5) + (");
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], "g");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], "g");
g_string_append (shader_source, " - 0.5) + (");
add_arg (glsl_shader_state, pipeline, layer,
src[0], op[0], "b");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_shader_state, pipeline, layer,
src[1], op[1], "b");
g_string_append_printf (shader_source, " - 0.5))).%s", swizzle);
break;
}
g_string_append_printf (shader_source, ";\n");
}
static gboolean
_cogl_pipeline_fragend_glsl_add_layer (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
unsigned long layers_difference)
{
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
CoglPipelineLayer *combine_authority =
_cogl_pipeline_layer_get_authority (layer,
COGL_PIPELINE_LAYER_STATE_COMBINE);
CoglPipelineLayerBigState *big_state = combine_authority->big_state;
if (!glsl_shader_state->source)
return TRUE;
if (!_cogl_pipeline_need_texture_combine_separate (combine_authority) ||
/* GL_DOT3_RGBA Is a bit weird as a GL_COMBINE_RGB function
* since if you use it, it overrides your ALPHA function...
*/
big_state->texture_combine_rgb_func ==
COGL_PIPELINE_COMBINE_FUNC_DOT3_RGBA)
append_masked_combine (pipeline,
layer,
"rgba",
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
else
{
append_masked_combine (pipeline,
layer,
"rgb",
big_state->texture_combine_rgb_func,
big_state->texture_combine_rgb_src,
big_state->texture_combine_rgb_op);
append_masked_combine (pipeline,
layer,
"a",
big_state->texture_combine_alpha_func,
big_state->texture_combine_alpha_src,
big_state->texture_combine_alpha_op);
}
return TRUE;
}
gboolean
_cogl_pipeline_fragend_glsl_passthrough (CoglPipeline *pipeline)
{
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
if (!glsl_shader_state->source)
return TRUE;
g_string_append (glsl_shader_state->source,
" cogl_color_out = cogl_color_in;\n");
return TRUE;
}
/* GLES2 doesn't have alpha testing so we need to implement it in the
shader */
#ifdef HAVE_COGL_GLES2
static void
add_alpha_test_snippet (CoglPipeline *pipeline,
GlslShaderState *glsl_shader_state)
{
CoglPipelineAlphaFunc alpha_func;
alpha_func = cogl_pipeline_get_alpha_test_function (pipeline);
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_ALWAYS)
/* Do nothing */
return;
if (alpha_func == COGL_PIPELINE_ALPHA_FUNC_NEVER)
{
/* Always discard the fragment */
g_string_append (glsl_shader_state->source,
" discard;\n");
return;
}
/* For all of the other alpha functions we need a uniform for the
reference */
g_string_append (glsl_shader_state->header,
"uniform float _cogl_alpha_test_ref;\n");
g_string_append (glsl_shader_state->source,
" if (cogl_color_out.a ");
switch (alpha_func)
{
case COGL_PIPELINE_ALPHA_FUNC_LESS:
g_string_append (glsl_shader_state->source, ">=");
break;
case COGL_PIPELINE_ALPHA_FUNC_EQUAL:
g_string_append (glsl_shader_state->source, "!=");
break;
case COGL_PIPELINE_ALPHA_FUNC_LEQUAL:
g_string_append (glsl_shader_state->source, ">");
break;
case COGL_PIPELINE_ALPHA_FUNC_GREATER:
g_string_append (glsl_shader_state->source, "<=");
break;
case COGL_PIPELINE_ALPHA_FUNC_NOTEQUAL:
g_string_append (glsl_shader_state->source, "==");
break;
case COGL_PIPELINE_ALPHA_FUNC_GEQUAL:
g_string_append (glsl_shader_state->source, "< ");
break;
case COGL_PIPELINE_ALPHA_FUNC_ALWAYS:
case COGL_PIPELINE_ALPHA_FUNC_NEVER:
g_assert_not_reached ();
break;
}
g_string_append (glsl_shader_state->source,
" _cogl_alpha_test_ref)\n discard;\n");
}
#endif /* HAVE_COGL_GLES2 */
gboolean
_cogl_pipeline_fragend_glsl_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
GlslShaderState *glsl_shader_state = get_glsl_shader_state (pipeline);
_COGL_GET_CONTEXT (ctx, FALSE);
if (glsl_shader_state->source)
{
const char *source_strings[2];
GLint lengths[2];
GLint compile_status;
GLuint shader;
int n_tex_coord_attribs = 0;
int i, n_layers;
COGL_STATIC_COUNTER (fragend_glsl_compile_counter,
"glsl fragment compile counter",
"Increments each time a new GLSL "
"fragment shader is compiled",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, fragend_glsl_compile_counter);
#ifdef HAVE_COGL_GLES2
if (ctx->driver == COGL_DRIVER_GLES2)
add_alpha_test_snippet (pipeline, glsl_shader_state);
#endif
g_string_append (glsl_shader_state->source, "}\n");
GE_RET( shader, ctx, glCreateShader (GL_FRAGMENT_SHADER) );
lengths[0] = glsl_shader_state->header->len;
source_strings[0] = glsl_shader_state->header->str;
lengths[1] = glsl_shader_state->source->len;
source_strings[1] = glsl_shader_state->source->str;
/* Find the highest texture unit that is sampled to pass as the
number of texture coordinate attributes */
n_layers = cogl_pipeline_get_n_layers (pipeline);
for (i = 0; i < n_layers; i++)
if (glsl_shader_state->unit_state[i].sampled)
n_tex_coord_attribs = i + 1;
_cogl_shader_set_source_with_boilerplate (shader, GL_FRAGMENT_SHADER,
n_tex_coord_attribs,
2, /* count */
source_strings, lengths);
GE( ctx, glCompileShader (shader) );
GE( ctx, glGetShaderiv (shader, GL_COMPILE_STATUS, &compile_status) );
if (!compile_status)
{
GLint len = 0;
char *shader_log;
GE( ctx, glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
shader_log = g_alloca (len);
GE( ctx, glGetShaderInfoLog (shader, len, &len, shader_log) );
g_warning ("Shader compilation failed:\n%s", shader_log);
}
glsl_shader_state->header = NULL;
glsl_shader_state->source = NULL;
glsl_shader_state->gl_shader = shader;
}
return TRUE;
}
static void
_cogl_pipeline_fragend_glsl_pre_change_notify (CoglPipeline *pipeline,
CoglPipelineState change,
const CoglColor *new_color)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if ((change & _cogl_pipeline_get_state_for_fragment_codegen (ctx)))
dirty_glsl_shader_state (pipeline);
}
/* NB: layers are considered immutable once they have any dependants
* so although multiple pipelines can end up depending on a single
* static layer, we can guarantee that if a layer is being *changed*
* then it can only have one pipeline depending on it.
*
* XXX: Don't forget this is *pre* change, we can't read the new value
* yet!
*/
static void
_cogl_pipeline_fragend_glsl_layer_pre_change_notify (
CoglPipeline *owner,
CoglPipelineLayer *layer,
CoglPipelineLayerState change)
{
CoglPipelineFragendGlslPrivate *priv;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
priv = get_glsl_priv (owner);
if (!priv)
return;
if ((change & _cogl_pipeline_get_layer_state_for_fragment_codegen (ctx)))
{
dirty_glsl_shader_state (owner);
return;
}
/* 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. */
}
static void
_cogl_pipeline_fragend_glsl_free_priv (CoglPipeline *pipeline)
{
CoglPipelineFragendGlslPrivate *priv = get_glsl_priv (pipeline);
if (priv)
{
if (priv->glsl_shader_state)
glsl_shader_state_unref (priv->glsl_shader_state);
g_slice_free (CoglPipelineFragendGlslPrivate, priv);
set_glsl_priv (pipeline, NULL);
}
}
const CoglPipelineFragend _cogl_pipeline_glsl_fragend =
{
_cogl_pipeline_fragend_glsl_start,
_cogl_pipeline_fragend_glsl_add_layer,
_cogl_pipeline_fragend_glsl_passthrough,
_cogl_pipeline_fragend_glsl_end,
_cogl_pipeline_fragend_glsl_pre_change_notify,
NULL, /* pipeline_set_parent_notify */
_cogl_pipeline_fragend_glsl_layer_pre_change_notify,
_cogl_pipeline_fragend_glsl_free_priv,
};
#endif /* COGL_PIPELINE_FRAGEND_GLSL */
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