static gboolean
_cogl_pipeline_vertend_glsl_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference)
{
CoglPipelineShaderState *shader_state;
CoglPipeline *template_pipeline = NULL;
CoglProgram *user_program;
_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 program has a vertex shader that isn't GLSL then the
appropriate vertend for that language should handle it */
if (user_program &&
_cogl_program_has_vertex_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) */
shader_state = get_shader_state (pipeline);
if (shader_state == NULL)
{
CoglPipeline *authority;
/* Get the authority for anything affecting vertex shader
state */
authority = _cogl_pipeline_find_equivalent_parent
(pipeline,
COGL_PIPELINE_STATE_AFFECTS_VERTEX_CODEGEN &
~COGL_PIPELINE_STATE_LAYERS,
COGL_PIPELINE_LAYER_STATE_AFFECTS_VERTEX_CODEGEN);
shader_state = get_shader_state (authority);
if (shader_state == NULL)
{
/* Check if there is already a similar cached pipeline whose
shader state we can share */
if (G_LIKELY (!(COGL_DEBUG_ENABLED
(COGL_DEBUG_DISABLE_PROGRAM_CACHES))))
{
template_pipeline =
_cogl_pipeline_cache_get_vertex_template (ctx->pipeline_cache,
authority);
shader_state = get_shader_state (template_pipeline);
}
if (shader_state)
shader_state->ref_count++;
else
shader_state = shader_state_new ();
set_shader_state (authority, shader_state);
if (template_pipeline)
{
shader_state->ref_count++;
set_shader_state (template_pipeline, shader_state);
}
}
if (authority != pipeline)
{
shader_state->ref_count++;
set_shader_state (pipeline, shader_state);
}
}
if (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 ||
shader_state->user_program_age == user_program->age)
return TRUE;
/* We need to recreate the shader so destroy the existing one */
GE( ctx, glDeleteShader (shader_state->gl_shader) );
shader_state->gl_shader = 0;
}
/* If we make it here then we have a 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)
shader_state->user_program_age = user_program->age;
/* If the user program contains a vertex shader then we don't need
to generate one */
if (user_program &&
_cogl_program_has_vertex_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);
shader_state->header = ctx->codegen_header_buffer;
shader_state->source = ctx->codegen_source_buffer;
g_string_append (shader_state->source,
"void\n"
"main ()\n"
"{\n");
if (ctx->driver == COGL_DRIVER_GLES2)
/* There is no builtin uniform for the pointsize on GLES2 so we need
to copy it from the custom uniform in the vertex shader */
g_string_append (shader_state->source,
" cogl_point_size_out = cogl_point_size_in;\n");
/* On regular OpenGL we'll just flush the point size builtin */
else if (pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
if (ctx->point_size_cache != authority->big_state->point_size)
{
GE( ctx, glPointSize (authority->big_state->point_size) );
ctx->point_size_cache = authority->big_state->point_size;
}
}
return TRUE;
}
static void
_cogl_pipeline_vertend_glsl_start (CoglPipeline *pipeline,
int n_layers,
unsigned long pipelines_difference)
{
CoglPipelineShaderState *shader_state;
CoglPipeline *template_pipeline = NULL;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Now lookup our glsl backend private state (allocating if
* necessary) */
shader_state = get_shader_state (pipeline);
if (shader_state == NULL)
{
CoglPipeline *authority;
/* Get the authority for anything affecting vertex shader
state */
authority = _cogl_pipeline_find_equivalent_parent
(pipeline,
COGL_PIPELINE_STATE_AFFECTS_VERTEX_CODEGEN &
~COGL_PIPELINE_STATE_LAYERS,
COGL_PIPELINE_LAYER_STATE_AFFECTS_VERTEX_CODEGEN);
shader_state = get_shader_state (authority);
if (shader_state == NULL)
{
/* Check if there is already a similar cached pipeline whose
shader state we can share */
if (G_LIKELY (!(COGL_DEBUG_ENABLED
(COGL_DEBUG_DISABLE_PROGRAM_CACHES))))
{
template_pipeline =
_cogl_pipeline_cache_get_vertex_template (ctx->pipeline_cache,
authority);
shader_state = get_shader_state (template_pipeline);
}
if (shader_state)
shader_state->ref_count++;
else
shader_state = shader_state_new ();
set_shader_state (authority, shader_state);
if (template_pipeline)
{
shader_state->ref_count++;
set_shader_state (template_pipeline, shader_state);
}
}
if (authority != pipeline)
{
shader_state->ref_count++;
set_shader_state (pipeline, shader_state);
}
}
if (shader_state->gl_shader)
return;
/* If we make it here then we have a shader_state struct without a gl_shader
because this is the first time we've encountered it */
/* 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);
shader_state->header = ctx->codegen_header_buffer;
shader_state->source = ctx->codegen_source_buffer;
add_layer_declarations (pipeline, shader_state);
add_global_declarations (pipeline, shader_state);
g_string_append (shader_state->source,
"void\n"
"cogl_generated_source ()\n"
"{\n");
if (!(ctx->private_feature_flags &
COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM))
/* There is no builtin uniform for the pointsize on GLES2 so we need
to copy it from the custom uniform in the vertex shader */
g_string_append (shader_state->source,
" cogl_point_size_out = cogl_point_size_in;\n");
}
