void
cogl_pipeline_set_front_face_winding (CoglPipeline *pipeline,
CoglWinding front_winding)
{
CoglPipelineState state = COGL_PIPELINE_STATE_CULL_FACE;
CoglPipeline *authority;
CoglPipelineCullFaceState *cull_face_state;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
cull_face_state = &authority->big_state->cull_face_state;
if (cull_face_state->front_winding == front_winding)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
pipeline->big_state->cull_face_state.front_winding = front_winding;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_cull_face_state_equal);
}
void
cogl_pipeline_set_color_mask (CoglPipeline *pipeline,
CoglColorMask color_mask)
{
CoglPipelineState state = COGL_PIPELINE_STATE_LOGIC_OPS;
CoglPipeline *authority;
CoglPipelineLogicOpsState *logic_ops_state;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
logic_ops_state = &authority->big_state->logic_ops_state;
if (logic_ops_state->color_mask == color_mask)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
logic_ops_state = &pipeline->big_state->logic_ops_state;
logic_ops_state->color_mask = color_mask;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_logic_ops_state_equal);
}
void
_cogl_pipeline_set_blend_enabled (CoglPipeline *pipeline,
CoglPipelineBlendEnable enable)
{
CoglPipelineState state = COGL_PIPELINE_STATE_BLEND_ENABLE;
CoglPipeline *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
_COGL_RETURN_IF_FAIL (enable > 1 &&
"don't pass TRUE or FALSE to _set_blend_enabled!");
authority = _cogl_pipeline_get_authority (pipeline, state);
if (authority->blend_enable == enable)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
pipeline->blend_enable = enable;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_blend_enable_equal);
_cogl_pipeline_update_blend_enable (pipeline, state);
}
void
cogl_pipeline_set_point_size (CoglPipeline *pipeline,
float point_size)
{
CoglPipelineState state = COGL_PIPELINE_STATE_POINT_SIZE;
CoglPipeline *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
if (authority->big_state->point_size == point_size)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
pipeline->big_state->point_size = point_size;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_point_size_equal);
}
static void
_cogl_pipeline_set_alpha_test_function_reference (CoglPipeline *pipeline,
float alpha_reference)
{
CoglPipelineState state = COGL_PIPELINE_STATE_ALPHA_FUNC_REFERENCE;
CoglPipeline *authority;
CoglPipelineAlphaFuncState *alpha_state;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
alpha_state = &authority->big_state->alpha_state;
if (alpha_state->alpha_func_reference == alpha_reference)
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
alpha_state = &pipeline->big_state->alpha_state;
alpha_state->alpha_func_reference = alpha_reference;
_cogl_pipeline_update_authority
(pipeline, authority, state,
_cogl_pipeline_alpha_func_reference_state_equal);
}
void
cogl_pipeline_set_color (CoglPipeline *pipeline,
const CoglColor *color)
{
CoglPipelineState state = COGL_PIPELINE_STATE_COLOR;
CoglPipeline *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority = _cogl_pipeline_get_authority (pipeline, state);
if (cogl_color_equal (color, &authority->color))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, color, FALSE);
pipeline->color = *color;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_color_equal);
_cogl_pipeline_update_blend_enable (pipeline, state);
}
static CoglPipelineSnippetList *
get_vertex_snippets (CoglPipeline *pipeline)
{
pipeline =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_VERTEX_SNIPPETS);
return &pipeline->big_state->vertex_snippets;
}
CoglBool
_cogl_pipeline_has_non_layer_fragment_snippets (CoglPipeline *pipeline)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_FRAGMENT_SNIPPETS);
return !COGL_LIST_EMPTY (&authority->big_state->fragment_snippets);
}
CoglBool
_cogl_pipeline_has_non_layer_vertex_snippets (CoglPipeline *pipeline)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_VERTEX_SNIPPETS);
return !COGL_LIST_EMPTY (&authority->big_state->vertex_snippets);
}
CoglPipelineBlendEnable
_cogl_pipeline_get_blend_enabled (CoglPipeline *pipeline)
{
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), FALSE);
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_BLEND_ENABLE);
return authority->blend_enable;
}
CoglPipelineAlphaFunc
cogl_pipeline_get_alpha_test_function (CoglPipeline *pipeline)
{
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), 0);
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_ALPHA_FUNC);
return authority->big_state->alpha_state.alpha_func;
}
void
cogl_pipeline_get_depth_state (CoglPipeline *pipeline,
CoglDepthState *state)
{
CoglPipeline *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_DEPTH);
*state = authority->big_state->depth_state;
}
CoglColorMask
cogl_pipeline_get_color_mask (CoglPipeline *pipeline)
{
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), 0);
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_LOGIC_OPS);
return authority->big_state->logic_ops_state.color_mask;
}
float
cogl_pipeline_get_point_size (CoglPipeline *pipeline)
{
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), FALSE);
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
return authority->big_state->point_size;
}
void
cogl_pipeline_get_color (CoglPipeline *pipeline,
CoglColor *color)
{
CoglPipeline *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_COLOR);
*color = authority->color;
}
float
cogl_pipeline_get_alpha_test_reference (CoglPipeline *pipeline)
{
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), 0.0f);
authority =
_cogl_pipeline_get_authority (pipeline,
COGL_PIPELINE_STATE_ALPHA_FUNC_REFERENCE);
return authority->big_state->alpha_state.alpha_func_reference;
}
CoglWinding
cogl_pipeline_get_front_face_winding (CoglPipeline *pipeline)
{
CoglPipelineState state = COGL_PIPELINE_STATE_CULL_FACE;
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline),
COGL_PIPELINE_CULL_FACE_MODE_NONE);
authority = _cogl_pipeline_get_authority (pipeline, state);
return authority->big_state->cull_face_state.front_winding;
}
CoglPipelineCullFaceMode
cogl_pipeline_get_cull_face_mode (CoglPipeline *pipeline)
{
CoglPipelineState state = COGL_PIPELINE_STATE_CULL_FACE;
CoglPipeline *authority;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline),
COGL_PIPELINE_CULL_FACE_MODE_NONE);
authority = _cogl_pipeline_get_authority (pipeline, state);
return authority->big_state->cull_face_state.mode;
}
CoglBool
cogl_pipeline_set_depth_state (CoglPipeline *pipeline,
const CoglDepthState *depth_state,
CoglError **error)
{
CoglPipelineState state = COGL_PIPELINE_STATE_DEPTH;
CoglPipeline *authority;
CoglDepthState *orig_state;
_COGL_GET_CONTEXT (ctx, FALSE);
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), FALSE);
_COGL_RETURN_VAL_IF_FAIL (depth_state->magic == COGL_DEPTH_STATE_MAGIC, FALSE);
authority = _cogl_pipeline_get_authority (pipeline, state);
orig_state = &authority->big_state->depth_state;
if (orig_state->test_enabled == depth_state->test_enabled &&
orig_state->write_enabled == depth_state->write_enabled &&
orig_state->test_function == depth_state->test_function &&
orig_state->range_near == depth_state->range_near &&
orig_state->range_far == depth_state->range_far)
return TRUE;
if (ctx->driver == COGL_DRIVER_GLES1 &&
(depth_state->range_near != 0 ||
depth_state->range_far != 1))
{
_cogl_set_error (error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_UNSUPPORTED,
"glDepthRange not available on GLES 1");
return FALSE;
}
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
pipeline->big_state->depth_state = *depth_state;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_depth_state_equal);
return TRUE;
}
static CoglBool
_cogl_pipeline_vertend_fixed_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
_COGL_GET_CONTEXT (ctx, FALSE);
if (pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
if (authority->big_state->point_size > 0.0f)
GE( ctx, glPointSize (authority->big_state->point_size) );
}
return TRUE;
}
void
cogl_pipeline_set_blend_constant (CoglPipeline *pipeline,
const CoglColor *constant_color)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
if (!(ctx->private_feature_flags & COGL_PRIVATE_FEATURE_BLEND_CONSTANT))
return;
#if defined(HAVE_COGL_GLES2) || defined(HAVE_COGL_GL)
{
CoglPipelineState state = COGL_PIPELINE_STATE_BLEND;
CoglPipeline *authority;
CoglPipelineBlendState *blend_state;
authority = _cogl_pipeline_get_authority (pipeline, state);
blend_state = &authority->big_state->blend_state;
if (cogl_color_equal (constant_color, &blend_state->blend_constant))
return;
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
blend_state = &pipeline->big_state->blend_state;
blend_state->blend_constant = *constant_color;
_cogl_pipeline_update_authority (pipeline, authority, state,
_cogl_pipeline_blend_state_equal);
_cogl_pipeline_update_blend_enable (pipeline, state);
}
#endif
}
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 CoglBool
_cogl_pipeline_vertend_glsl_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
CoglPipelineShaderState *shader_state;
_COGL_GET_CONTEXT (ctx, FALSE);
shader_state = get_shader_state (pipeline);
if (shader_state->source)
{
const char *source_strings[2];
GLint lengths[2];
GLint compile_status;
GLuint shader;
CoglPipelineSnippetData snippet_data;
CoglPipelineSnippetList *vertex_snippets;
COGL_STATIC_COUNTER (vertend_glsl_compile_counter,
"glsl vertex compile counter",
"Increments each time a new GLSL "
"vertex shader is compiled",
0 /* no application private data */);
COGL_COUNTER_INC (_cogl_uprof_context, vertend_glsl_compile_counter);
g_string_append (shader_state->header,
"void\n"
"cogl_real_vertex_transform ()\n"
"{\n"
" cogl_position_out = "
"cogl_modelview_projection_matrix * "
"cogl_position_in;\n"
"}\n");
g_string_append (shader_state->source,
" cogl_vertex_transform ();\n"
" cogl_color_out = cogl_color_in;\n"
"}\n");
vertex_snippets = get_vertex_snippets (pipeline);
/* Add hooks for the vertex transform part */
memset (&snippet_data, 0, sizeof (snippet_data));
snippet_data.snippets = vertex_snippets;
snippet_data.hook = COGL_SNIPPET_HOOK_VERTEX_TRANSFORM;
snippet_data.chain_function = "cogl_real_vertex_transform";
snippet_data.final_name = "cogl_vertex_transform";
snippet_data.function_prefix = "cogl_vertex_transform";
snippet_data.source_buf = shader_state->header;
_cogl_pipeline_snippet_generate_code (&snippet_data);
/* Add all of the hooks for vertex processing */
memset (&snippet_data, 0, sizeof (snippet_data));
snippet_data.snippets = vertex_snippets;
snippet_data.hook = COGL_SNIPPET_HOOK_VERTEX;
snippet_data.chain_function = "cogl_generated_source";
snippet_data.final_name = "cogl_vertex_hook";
snippet_data.function_prefix = "cogl_vertex_hook";
snippet_data.source_buf = shader_state->source;
_cogl_pipeline_snippet_generate_code (&snippet_data);
g_string_append (shader_state->source,
"void\n"
"main ()\n"
"{\n"
" cogl_vertex_hook ();\n");
/* If there are any snippets then we can't rely on the
projection matrix to flip the rendering for offscreen buffers
so we'll need to flip it using an extra statement and a
uniform */
if (_cogl_pipeline_has_vertex_snippets (pipeline))
{
g_string_append (shader_state->header,
"uniform vec4 _cogl_flip_vector;\n");
g_string_append (shader_state->source,
" cogl_position_out *= _cogl_flip_vector;\n");
}
g_string_append (shader_state->source,
"}\n");
GE_RET( shader, ctx, glCreateShader (GL_VERTEX_SHADER) );
lengths[0] = shader_state->header->len;
source_strings[0] = shader_state->header->str;
lengths[1] = shader_state->source->len;
source_strings[1] = shader_state->source->str;
_cogl_glsl_shader_set_source_with_boilerplate (ctx,
NULL,
shader, GL_VERTEX_SHADER,
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);
}
shader_state->header = NULL;
shader_state->source = NULL;
shader_state->gl_shader = shader;
}
if ((ctx->private_feature_flags &
COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM) &&
(pipelines_difference & COGL_PIPELINE_STATE_POINT_SIZE))
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_POINT_SIZE);
GE( ctx, glPointSize (authority->big_state->point_size) );
}
return TRUE;
}
static gboolean
_cogl_pipeline_fragend_fixed_end (CoglPipeline *pipeline,
unsigned long pipelines_difference)
{
int highest_unit_index = -1;
int i;
_COGL_GET_CONTEXT (ctx, FALSE);
_cogl_pipeline_foreach_layer_internal (pipeline,
get_highest_unit_index_cb,
&highest_unit_index);
/* Disable additional texture units that may have previously been in use.. */
for (i = highest_unit_index + 1; i < ctx->texture_units->len; i++)
_cogl_disable_texture_unit (i);
if (pipelines_difference & COGL_PIPELINE_STATE_FOG)
{
CoglPipeline *authority =
_cogl_pipeline_get_authority (pipeline, COGL_PIPELINE_STATE_FOG);
CoglPipelineFogState *fog_state = &authority->big_state->fog_state;
if (fog_state->enabled)
{
GLfloat fogColor[4];
GLenum gl_mode = GL_LINEAR;
fogColor[0] = cogl_color_get_red_float (&fog_state->color);
fogColor[1] = cogl_color_get_green_float (&fog_state->color);
fogColor[2] = cogl_color_get_blue_float (&fog_state->color);
fogColor[3] = cogl_color_get_alpha_float (&fog_state->color);
GE (ctx, glEnable (GL_FOG));
GE (ctx, glFogfv (GL_FOG_COLOR, fogColor));
if (ctx->driver == COGL_DRIVER_GLES1)
switch (fog_state->mode)
{
case COGL_FOG_MODE_LINEAR:
gl_mode = GL_LINEAR;
break;
case COGL_FOG_MODE_EXPONENTIAL:
gl_mode = GL_EXP;
break;
case COGL_FOG_MODE_EXPONENTIAL_SQUARED:
gl_mode = GL_EXP2;
break;
}
/* TODO: support other modes for GLES2 */
/* NB: GLES doesn't have glFogi */
GE (ctx, glFogf (GL_FOG_MODE, gl_mode));
GE (ctx, glHint (GL_FOG_HINT, GL_NICEST));
GE (ctx, glFogf (GL_FOG_DENSITY, fog_state->density));
GE (ctx, glFogf (GL_FOG_START, fog_state->z_near));
GE (ctx, glFogf (GL_FOG_END, fog_state->z_far));
}
else
GE (ctx, glDisable (GL_FOG));
}
return TRUE;
}
CoglBool
cogl_pipeline_set_blend (CoglPipeline *pipeline,
const char *blend_description,
CoglError **error)
{
CoglPipelineState state = COGL_PIPELINE_STATE_BLEND;
CoglPipeline *authority;
CoglBlendStringStatement statements[2];
CoglBlendStringStatement *rgb;
CoglBlendStringStatement *a;
int count;
CoglPipelineBlendState *blend_state;
_COGL_GET_CONTEXT (ctx, FALSE);
_COGL_RETURN_VAL_IF_FAIL (cogl_is_pipeline (pipeline), FALSE);
count =
_cogl_blend_string_compile (blend_description,
COGL_BLEND_STRING_CONTEXT_BLENDING,
statements,
error);
if (!count)
return FALSE;
if (count == 1)
rgb = a = statements;
else
{
rgb = &statements[0];
a = &statements[1];
}
authority =
_cogl_pipeline_get_authority (pipeline, state);
/* - Flush journal primitives referencing the current state.
* - Make sure the pipeline has no dependants so it may be modified.
* - If the pipeline isn't currently an authority for the state being
* changed, then initialize that state from the current authority.
*/
_cogl_pipeline_pre_change_notify (pipeline, state, NULL, FALSE);
blend_state = &pipeline->big_state->blend_state;
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES2)
if (ctx->driver != COGL_DRIVER_GLES1)
{
setup_blend_state (rgb,
&blend_state->blend_equation_rgb,
&blend_state->blend_src_factor_rgb,
&blend_state->blend_dst_factor_rgb);
setup_blend_state (a,
&blend_state->blend_equation_alpha,
&blend_state->blend_src_factor_alpha,
&blend_state->blend_dst_factor_alpha);
}
else
#endif
{
setup_blend_state (rgb,
NULL,
&blend_state->blend_src_factor_rgb,
&blend_state->blend_dst_factor_rgb);
}
/* If we are the current authority see if we can revert to one of our
* ancestors being the authority */
if (pipeline == authority &&
_cogl_pipeline_get_parent (authority) != NULL)
{
CoglPipeline *parent = _cogl_pipeline_get_parent (authority);
CoglPipeline *old_authority =
_cogl_pipeline_get_authority (parent, state);
if (_cogl_pipeline_blend_state_equal (authority, old_authority))
pipeline->differences &= ~state;
}
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (pipeline != authority)
{
pipeline->differences |= state;
_cogl_pipeline_prune_redundant_ancestry (pipeline);
}
_cogl_pipeline_update_blend_enable (pipeline, state);
return TRUE;
}
