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Generate GLSL in the CoglPipeline GLSL backend

Browse source 
The GLSL pipeline backend can now generate code to represent the
pipeline state in a similar way to the ARBfp backend. Most of the code
for this is taken from the GLES 2 wrapper.
This commit is contained in:
Neil Roberts 2010-11-19 10:44:27 +00:00
parent 46e59dc50f
commit 7da3610e82
3 changed files with 710 additions and 80 deletions
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1
cogl/cogl-context.c
View file

@ -132,6 +132,7 @@ cogl_create_context (void)
_context->opaque_color_pipeline = cogl_pipeline_new ();
_context->blended_color_pipeline = cogl_pipeline_new ();
_context->texture_pipeline = cogl_pipeline_new ();
_context->fragment_header_buffer = g_string_new ("");
_context->fragment_source_buffer = g_string_new ("");
_context->source_stack = NULL;

1
cogl/cogl-context.h
View file

@ -86,6 +86,7 @@ typedef struct
CoglPipeline *opaque_color_pipeline; /* used for set_source_color */
CoglPipeline *blended_color_pipeline; /* used for set_source_color */
CoglPipeline *texture_pipeline; /* used for set_source_texture */
GString *fragment_header_buffer;
GString *fragment_source_buffer;
GList *source_stack;

788
cogl/cogl-pipeline-glsl.c
View file

@ -29,8 +29,11 @@
#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_BACKEND_GLSL
@ -43,13 +46,22 @@
#ifndef HAVE_COGL_GLES2
#define glCreateProgram ctx->drv.pf_glCreateProgram
#define glAttachShader ctx->drv.pf_glAttachShader
#define glUseProgram ctx->drv.pf_glUseProgram
#define glLinkProgram ctx->drv.pf_glLinkProgram
#define glDeleteProgram ctx->drv.pf_glDeleteProgram
#define glGetProgramInfoLog ctx->drv.pf_glGetProgramInfoLog
#define glGetProgramiv ctx->drv.pf_glGetProgramiv
#define glCreateProgram ctx->drv.pf_glCreateProgram
#define glAttachShader ctx->drv.pf_glAttachShader
#define glUseProgram ctx->drv.pf_glUseProgram
#define glLinkProgram ctx->drv.pf_glLinkProgram
#define glDeleteProgram ctx->drv.pf_glDeleteProgram
#define glGetProgramInfoLog ctx->drv.pf_glGetProgramInfoLog
#define glGetProgramiv ctx->drv.pf_glGetProgramiv
#define glCreateShader ctx->drv.pf_glCreateShader
#define glGetShaderiv ctx->drv.pf_glGetShaderiv
#define glGetShaderInfoLog ctx->drv.pf_glGetShaderInfoLog
#define glCompileShader ctx->drv.pf_glCompileShader
#define glShaderSource ctx->drv.pf_glShaderSource
#define glDeleteShader ctx->drv.pf_glDeleteShader
#define glGetUniformLocation ctx->drv.pf_glGetUniformLocation
#define glUniform1i ctx->drv.pf_glUniform1i
#define glUniform4fv ctx->drv.pf_glUniform4fv
#endif /* HAVE_COGL_GLES2 */
@ -63,6 +75,20 @@
#include "../gles/cogl-gles2-wrapper.h"
#endif
/* 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;
unsigned int dirty_combine_constant:1;
GLint combine_constant_uniform;
} UnitState;
typedef struct _GlslProgramState
{
int ref_count;
@ -72,8 +98,9 @@ typedef struct _GlslProgramState
program */
unsigned int user_program_age;
GLuint gl_program;
GString *header, *source;
UnitState *unit_state;
#ifdef HAVE_COGL_GLES2
/* To allow writing shaders that are portable between GLES 2 and
* OpenGL Cogl prepends a number of boilerplate #defines and
* declarations to user shaders. One of those declarations is an
@ -82,11 +109,6 @@ typedef struct _GlslProgramState
* attributes are in use. The boilerplate also needs to be changed
* if this increases. */
int n_tex_coord_attribs;
#endif
/* This is set to TRUE if the program has changed since we last
flushed the uniforms */
gboolean gl_program_changed;
#ifdef HAVE_COGL_GLES2
/* The GLES2 generated program that was generated from the user
@ -96,6 +118,10 @@ typedef struct _GlslProgramState
this GLSL backend starts generating its own shaders */
GLuint gles2_program;
#endif
/* We need to track the last pipeline that the program was used with
* so know if we need to update all of the uniforms */
CoglPipeline *last_used_for_pipeline;
} GlslProgramState;
typedef struct _CoglPipelineBackendGlslPrivate
@ -117,6 +143,7 @@ glsl_program_state_new (int n_layers)
GlslProgramState *state = g_slice_new0 (GlslProgramState);
state->ref_count = 1;
state->unit_state = g_new0 (UnitState, n_layers);
return state;
}
@ -158,23 +185,12 @@ glsl_program_state_unref (GlslProgramState *state)
state->gl_program = 0;
}
g_free (state->unit_state);
g_slice_free (GlslProgramState, state);
}
}
/* This tries to find the oldest ancestor whos state would generate
* the same glsl program as the current pipeline. This is a simple
* mechanism for reducing the number of glsl programs we have to
* generate.
*/
static CoglPipeline *
find_glsl_authority (CoglPipeline *pipeline, CoglHandle user_program)
{
/* Find the first pipeline that modifies the user shader */
return _cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_USER_SHADER);
}
static CoglPipelineBackendGlslPrivate *
get_glsl_priv (CoglPipeline *pipeline)
{
@ -270,8 +286,8 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
CoglPipeline *authority;
CoglPipelineBackendGlslPrivate *authority_priv;
CoglProgram *user_program;
GLuint gl_program;
GSList *l;
int i;
_COGL_GET_CONTEXT (ctx, FALSE);
@ -279,9 +295,9 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
return FALSE;
user_program = cogl_pipeline_get_user_program (pipeline);
if (user_program == COGL_INVALID_HANDLE ||
if (user_program &&
_cogl_program_get_language (user_program) != COGL_SHADER_LANGUAGE_GLSL)
return FALSE; /* XXX: change me when we support code generation here */
return FALSE;
/* Now lookup our glsl backend private state (allocating if
* necessary) */
@ -302,12 +318,13 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
* Also if the number of texture coordinate attributes in use has
* increased, then delete the program so we can prepend a new
* _cogl_tex_coord[] varying array declaration. */
if (priv->glsl_program_state->user_program_age == user_program->age
if (user_program == NULL ||
(priv->glsl_program_state->user_program_age == user_program->age
#ifdef HAVE_COGL_GLES2
&& priv->glsl_program_state->n_tex_coord_attribs >=
n_tex_coord_attribs
&& (priv->glsl_program_state->n_tex_coord_attribs >=
n_tex_coord_attribs)
#endif
)
))
return TRUE;
/* Destroy the existing program. We can't just dirty the whole
@ -326,7 +343,8 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
* glsl-authority to maximize the chance that other pipelines can
* share it.
*/
authority = find_glsl_authority (pipeline, user_program);
authority =
_cogl_pipeline_find_codegen_authority (pipeline, user_program);
authority_priv = get_glsl_priv (authority);
if (!authority_priv)
{
@ -342,14 +360,14 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
GlslProgramState *glsl_program_state =
glsl_program_state_new (n_layers);
authority_priv->glsl_program_state = glsl_program_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_program_state =
glsl_program_state_ref (authority_priv->glsl_program_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_program_state =
glsl_program_state_ref (authority_priv->glsl_program_state);
}
/* If we make it here then we have a glsl_program_state struct
@ -357,56 +375,506 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
encountered it or because the user program has changed since it
was last linked */
priv->glsl_program_state->gl_program_changed = TRUE;
GE_RET( gl_program, glCreateProgram () );
#ifdef HAVE_COGL_GLES2
/* Find the largest count of texture coordinate attributes
* associated with each of the shaders so we can ensure a consistent
* _cogl_tex_coord[] array declaration across all of the shaders.*/
for (l = user_program->attached_shaders; l; l = l->next)
{
CoglShader *shader = l->data;
n_tex_coord_attribs = MAX (shader->n_tex_coord_attribs,
n_tex_coord_attribs);
}
if (user_program)
for (l = user_program->attached_shaders; l; l = l->next)
{
CoglShader *shader = l->data;
n_tex_coord_attribs = MAX (shader->n_tex_coord_attribs,
n_tex_coord_attribs);
}
#endif
/* Add all of the shaders from the user program */
for (l = user_program->attached_shaders; l; l = l->next)
{
CoglShader *shader = l->data;
g_assert (shader->language == COGL_SHADER_LANGUAGE_GLSL);
_cogl_shader_compile_real (shader, n_tex_coord_attribs);
GE( glAttachShader (gl_program, shader->gl_handle) );
}
priv->glsl_program_state->gl_program = gl_program;
priv->glsl_program_state->user_program_age = user_program->age;
#ifdef HAVE_COGL_GLES2
priv->glsl_program_state->n_tex_coord_attribs = n_tex_coord_attribs;
#endif
link_program (gl_program);
/* Check whether the user program contains a fragment
shader. Otherwise we need to generate one */
if (user_program)
for (l = user_program->attached_shaders; l; l = l->next)
{
CoglShader *shader = l->data;
if (shader->type == COGL_SHADER_TYPE_FRAGMENT)
goto no_fragment_shader_needed;
}
/* 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->fragment_header_buffer, 0);
g_string_set_size (ctx->fragment_source_buffer, 0);
priv->glsl_program_state->header = ctx->fragment_header_buffer;
priv->glsl_program_state->source = ctx->fragment_source_buffer;
g_string_append (priv->glsl_program_state->source,
"void\n"
"main ()\n"
"{\n");
for (i = 0; i < n_layers; i++)
{
priv->glsl_program_state->unit_state[i].sampled = FALSE;
priv->glsl_program_state->unit_state[i].combine_constant_used = FALSE;
priv->glsl_program_state->unit_state[i].dirty_combine_constant = FALSE;
}
no_fragment_shader_needed:
return TRUE;
}
gboolean
_cogl_pipeline_backend_glsl_add_layer (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
unsigned long layers_difference)
static void
add_constant_lookup (GlslProgramState *glsl_program_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_program_state->unit_state[unit_index].combine_constant_used)
{
g_string_append_printf (glsl_program_state->header,
"uniform vec4 _cogl_layer_constant_%i;\n",
unit_index);
glsl_program_state->unit_state[unit_index].combine_constant_used = TRUE;
glsl_program_state->unit_state[unit_index].dirty_combine_constant = TRUE;
}
g_string_append_printf (glsl_program_state->source,
"_cogl_layer_constant_%i.%s",
unit_index, swizzle);
}
static void
add_texture_lookup (GlslProgramState *glsl_program_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;
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)
{
#ifndef HAVE_COGL_GLES2
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_program_state->unit_state[unit_index].sampled)
{
g_string_append_printf (glsl_program_state->header,
"uniform sampler%s _cogl_sampler_%i;\n",
target_string,
unit_index);
glsl_program_state->unit_state[unit_index].sampled = TRUE;
}
g_string_append_printf (glsl_program_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 */
if (cogl_pipeline_get_layer_point_sprite_coords_enabled (pipeline,
layer->index))
g_string_append_printf (glsl_program_state->source,
"gl_PointCoord.%s",
tex_coord_swizzle);
else
g_string_append_printf (glsl_program_state->source,
"cogl_tex_coord_in[%d].%s",
unit_index, tex_coord_swizzle);
g_string_append_printf (glsl_program_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 (GlslProgramState *glsl_program_state,
CoglPipeline *pipeline,
CoglPipelineLayer *layer,
GLint src,
GLenum operand,
const char *swizzle)
{
GString *shader_source = glsl_program_state->source;
char alpha_swizzle[5] = "aaaa";
g_string_append_c (shader_source, '(');
if (operand == GL_ONE_MINUS_SRC_COLOR || operand == GL_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 == GL_SRC_ALPHA || operand == GL_ONE_MINUS_SRC_ALPHA)
{
alpha_swizzle[strlen (swizzle)] = '\0';
swizzle = alpha_swizzle;
}
switch (src)
{
case GL_TEXTURE:
add_texture_lookup (glsl_program_state,
pipeline,
layer,
swizzle);
break;
case GL_CONSTANT:
add_constant_lookup (glsl_program_state,
pipeline,
layer,
swizzle);
break;
case GL_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 GL_PRIMARY_COLOR:
g_string_append_printf (shader_source, "cogl_color_in.%s", swizzle);
break;
default:
if (src >= GL_TEXTURE0 && src < GL_TEXTURE0 + 32)
{
FindPipelineLayerData data;
data.unit_index = src - GL_TEXTURE0;
data.layer = layer;
_cogl_pipeline_foreach_layer_internal (pipeline,
find_pipeline_layer_cb,
&data);
add_texture_lookup (glsl_program_state,
pipeline,
data.layer,
swizzle);
}
break;
}
g_string_append_c (shader_source, ')');
}
static void
append_masked_combine (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
const char *swizzle,
GLint function,
GLint *src,
GLint *op)
{
GlslProgramState *glsl_program_state = get_glsl_program_state (pipeline);
GString *shader_source = glsl_program_state->source;
g_string_append_printf (glsl_program_state->source,
" cogl_color_out.%s = ", swizzle);
switch (function)
{
case GL_REPLACE:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
break;
case GL_MODULATE:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (glsl_program_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case GL_ADD:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_program_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case GL_ADD_SIGNED:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_program_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 GL_SUBTRACT:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " - ");
add_arg (glsl_program_state, pipeline, layer,
src[1], op[1], swizzle);
break;
case GL_INTERPOLATE:
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], swizzle);
g_string_append (shader_source, " * ");
add_arg (glsl_program_state, pipeline, layer,
src[2], op[2], swizzle);
g_string_append (shader_source, " + ");
add_arg (glsl_program_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_program_state, pipeline, layer,
src[2], op[2], swizzle);
g_string_append_c (shader_source, ')');
break;
case GL_DOT3_RGB:
case GL_DOT3_RGBA:
g_string_append (shader_source, "vec4(4 * ((");
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], "r");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_program_state, pipeline, layer,
src[1], op[1], "r");
g_string_append (shader_source, " - 0.5) + (");
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], "g");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_program_state, pipeline, layer,
src[1], op[1], "g");
g_string_append (shader_source, " - 0.5) + (");
add_arg (glsl_program_state, pipeline, layer,
src[0], op[0], "b");
g_string_append (shader_source, " - 0.5) * (");
add_arg (glsl_program_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_backend_glsl_add_layer (CoglPipeline *pipeline,
CoglPipelineLayer *layer,
unsigned long layers_difference)
{
GlslProgramState *glsl_program_state = get_glsl_program_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_program_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 == GL_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_backend_glsl_passthrough (CoglPipeline *pipeline)
{
GlslProgramState *glsl_program_state = get_glsl_program_state (pipeline);
if (!glsl_program_state->source)
return TRUE;
g_string_append (glsl_program_state->source,
" cogl_color_out = cogl_color_in;\n");
return TRUE;
}
typedef struct
{
int unit;
GLuint gl_program;
gboolean update_all;
GlslProgramState *glsl_program_state;
} UpdateUniformsState;
static gboolean
get_uniform_cb (CoglPipeline *pipeline,
int layer_index,
void *user_data)
{
UpdateUniformsState *state = user_data;
GlslProgramState *glsl_program_state = state->glsl_program_state;
UnitState *unit_state = &glsl_program_state->unit_state[state->unit];
GLint uniform_location;
_COGL_GET_CONTEXT (ctx, FALSE);
if (unit_state->sampled)
{
/* We can reuse the source buffer to create the uniform name because
the program has now been linked */
g_string_set_size (ctx->fragment_source_buffer, 0);
g_string_append_printf (ctx->fragment_source_buffer,
"_cogl_sampler_%i", state->unit);
GE_RET( uniform_location,
glGetUniformLocation (state->gl_program,
ctx->fragment_source_buffer->str) );
g_return_val_if_fail (uniform_location != -1, TRUE);
/* We can set the uniform immediately because the samplers are
the unit index not the texture object number so it will never
change. Unfortunately GL won't let us use a constant instead
of a uniform */
GE( glUniform1i (uniform_location, state->unit) );
}
if (unit_state->combine_constant_used)
{
g_string_set_size (ctx->fragment_source_buffer, 0);
g_string_append_printf (ctx->fragment_source_buffer,
"_cogl_layer_constant_%i", state->unit);
GE_RET( uniform_location,
glGetUniformLocation (state->gl_program,
ctx->fragment_source_buffer->str) );
g_return_val_if_fail (uniform_location != -1, TRUE);
unit_state->combine_constant_uniform = uniform_location;
}
state->unit++;
return TRUE;
}
static gboolean
update_constants_cb (CoglPipeline *pipeline,
int layer_index,
void *user_data)
{
UpdateUniformsState *state = user_data;
GlslProgramState *glsl_program_state = state->glsl_program_state;
UnitState *unit_state = &glsl_program_state->unit_state[state->unit++];
_COGL_GET_CONTEXT (ctx, FALSE);
if (unit_state->combine_constant_used &&
(state->update_all || unit_state->dirty_combine_constant))
{
float constant[4];
_cogl_pipeline_get_layer_combine_constant (pipeline,
layer_index,
constant);
GE (glUniform4fv (unit_state->combine_constant_uniform,
1, constant));
unit_state->dirty_combine_constant = FALSE;
}
return TRUE;
}
@ -415,11 +883,105 @@ _cogl_pipeline_backend_glsl_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
GlslProgramState *glsl_program_state = get_glsl_program_state (pipeline);
CoglProgram *user_program;
GLuint gl_program;
gboolean gl_program_changed;
gboolean gl_program_changed = FALSE;
UpdateUniformsState state;
_COGL_GET_CONTEXT (ctx, FALSE);
gl_program = glsl_program_state->gl_program;
gl_program_changed = glsl_program_state->gl_program_changed;
user_program = cogl_pipeline_get_user_program (pipeline);
if (gl_program == 0)
{
gl_program_changed = TRUE;
GE_RET( gl_program, glCreateProgram () );
if (user_program)
{
GSList *l;
/* Add all of the shaders from the user program */
for (l = user_program->attached_shaders; l; l = l->next)
{
CoglShader *shader = l->data;
g_assert (shader->language == COGL_SHADER_LANGUAGE_GLSL);
_cogl_shader_compile_real (shader,
glsl_program_state->
n_tex_coord_attribs);
GE( glAttachShader (gl_program, shader->gl_handle) );
}
glsl_program_state->user_program_age = user_program->age;
}
if (glsl_program_state->source)
{
const GLchar *source_strings[2];
GLint lengths[2];
GLint compile_status;
GLuint shader;
COGL_STATIC_COUNTER (backend_glsl_compile_counter,
"glsl compile counter",
"Increments each time a new GLSL "
"program is compiled",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, backend_glsl_compile_counter);
g_string_append (glsl_program_state->source, "}\n");
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_SHOW_SOURCE))
g_message ("pipeline program:\n%s%s",
glsl_program_state->header->str,
glsl_program_state->source->str);
GE_RET( shader, glCreateShader (GL_FRAGMENT_SHADER) );
lengths[0] = glsl_program_state->header->len;
source_strings[0] = glsl_program_state->header->str;
lengths[1] = glsl_program_state->source->len;
source_strings[1] = glsl_program_state->source->str;
_cogl_shader_set_source_with_boilerplate (shader, GL_FRAGMENT_SHADER,
glsl_program_state->
n_tex_coord_attribs,
2, /* count */
source_strings, lengths);
GE( glCompileShader (shader) );
GE( glGetShaderiv (shader, GL_COMPILE_STATUS, &compile_status) );
if (!compile_status)
{
GLint len = 0;
char *shader_log;
GE( glGetShaderiv (shader, GL_INFO_LOG_LENGTH, &len) );
shader_log = g_alloca (len);
GE( glGetShaderInfoLog (shader, len, &len, shader_log) );
g_warning ("Shader compilation failed:\n%s", shader_log);
}
GE( glAttachShader (gl_program, shader) );
/* We can delete the shader now, but it won't actually be
destroyed until the program is also desroyed */
GE( glDeleteShader (shader) );
glsl_program_state->header = NULL;
glsl_program_state->source = NULL;
}
link_program (gl_program);
glsl_program_state->gl_program = gl_program;
}
#ifdef HAVE_COGL_GLES2
/* This function is a massive hack to get the GLES2 backend to
@ -437,10 +999,31 @@ _cogl_pipeline_backend_glsl_end (CoglPipeline *pipeline,
_cogl_use_program (gl_program, COGL_PIPELINE_PROGRAM_TYPE_GLSL);
#endif
_cogl_program_flush_uniforms (cogl_pipeline_get_user_program (pipeline),
gl_program, gl_program_changed);
state.unit = 0;
state.gl_program = gl_program;
state.glsl_program_state = glsl_program_state;
glsl_program_state->gl_program_changed = FALSE;
if (gl_program_changed)
cogl_pipeline_foreach_layer (pipeline,
get_uniform_cb,
&state);
state.unit = 0;
state.update_all = (gl_program_changed ||
glsl_program_state->last_used_for_pipeline != pipeline);
cogl_pipeline_foreach_layer (pipeline,
update_constants_cb,
&state);
if (user_program)
_cogl_program_flush_uniforms (user_program,
gl_program,
gl_program_changed);
/* We need to track the last pipeline that the program was used with
* so know if we need to update all of the uniforms */
glsl_program_state->last_used_for_pipeline = pipeline;
return TRUE;
}
@ -450,15 +1033,60 @@ _cogl_pipeline_backend_glsl_pre_change_notify (CoglPipeline *pipeline,
CoglPipelineState change,
const CoglColor *new_color)
{
static const unsigned long glsl_op_changes =
static const unsigned long fragment_op_changes =
COGL_PIPELINE_STATE_LAYERS |
COGL_PIPELINE_STATE_USER_SHADER;
/* TODO: COGL_PIPELINE_STATE_FOG */
if (!(change & glsl_op_changes))
if (!(change & fragment_op_changes))
return;
dirty_glsl_program_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_backend_glsl_layer_pre_change_notify (
CoglPipeline *owner,
CoglPipelineLayer *layer,
CoglPipelineLayerState change)
{
CoglPipelineBackendGlslPrivate *priv;
static const unsigned long not_fragment_op_changes =
COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT |
COGL_PIPELINE_LAYER_STATE_TEXTURE;
priv = get_glsl_priv (owner);
if (!priv)
return;
if (!(change & not_fragment_op_changes))
{
dirty_glsl_program_state (owner);
return;
}
if (change & COGL_PIPELINE_LAYER_STATE_COMBINE_CONSTANT)
{
GlslProgramState *glsl_program_state =
get_glsl_program_state (owner);
int unit_index = _cogl_pipeline_layer_get_unit_index (layer);
glsl_program_state->unit_state[unit_index].dirty_combine_constant = TRUE;
}
/* TODO: we could be saving snippets of texture combine code along
* with each layer and then when a layer changes we would just free
* the snippet. */
return;
}
static void
_cogl_pipeline_backend_glsl_free_priv (CoglPipeline *pipeline)
{
@ -481,7 +1109,7 @@ const CoglPipelineBackend _cogl_pipeline_glsl_backend =
_cogl_pipeline_backend_glsl_end,
_cogl_pipeline_backend_glsl_pre_change_notify,
NULL, /* pipeline_set_parent_notify */
NULL, /* layer_pre_change_notify */
_cogl_pipeline_backend_glsl_layer_pre_change_notify,
_cogl_pipeline_backend_glsl_free_priv,
NULL /* free_layer_priv */
};