174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_PIPELINE_H__
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#define __COGL_PIPELINE_H__
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/* We forward declare the CoglPipeline type here to avoid some circular
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* dependency issues with the following headers.
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*/
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typedef struct _CoglPipeline CoglPipeline;
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-context.h>
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#include <cogl/cogl-snippet.h>
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COGL_BEGIN_DECLS
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#ifdef COGL_ENABLE_EXPERIMENTAL_API
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/**
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* SECTION:cogl-pipeline
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* @short_description: Functions for creating and manipulating the GPU
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* pipeline
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*
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* Cogl allows creating and manipulating objects representing the full
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* configuration of the GPU pipeline. In simplified terms the GPU
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* pipeline takes primitive geometry as the input, it first performs
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* vertex processing, allowing you to deform your geometry, then
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* rasterizes that (turning it from pure geometry into fragments) then
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* performs fragment processing including depth testing and texture
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* mapping. Finally it blends the result with the framebuffer.
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*/
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#define COGL_PIPELINE(OBJECT) ((CoglPipeline *)OBJECT)
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/**
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* cogl_pipeline_new:
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* @context: a #CoglContext
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*
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* Allocates and initializes a default simple pipeline that will color
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* a primitive white.
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*
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* Return value: (transfer full): a pointer to a new #CoglPipeline
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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CoglPipeline *
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cogl_pipeline_new (CoglContext *context);
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/**
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* cogl_pipeline_copy:
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* @source: a #CoglPipeline object to copy
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*
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* Creates a new pipeline with the configuration copied from the
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* source pipeline.
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*
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* We would strongly advise developers to always aim to use
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* cogl_pipeline_copy() instead of cogl_pipeline_new() whenever there will
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* be any similarity between two pipelines. Copying a pipeline helps Cogl
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* keep track of a pipelines ancestry which we may use to help minimize GPU
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* state changes.
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*
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* Return value: (transfer full): a pointer to the newly allocated #CoglPipeline
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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CoglPipeline *
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cogl_pipeline_copy (CoglPipeline *source);
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/**
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* cogl_is_pipeline:
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* @object: A #CoglObject
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*
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* Gets whether the given @object references an existing pipeline object.
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*
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* Return value: %TRUE if the @object references a #CoglPipeline,
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* %FALSE otherwise
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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CoglBool
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cogl_is_pipeline (void *object);
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/**
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* CoglPipelineLayerCallback:
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* @pipeline: The #CoglPipeline whos layers are being iterated
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* @layer_index: The current layer index
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* @user_data: The private data passed to cogl_pipeline_foreach_layer()
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*
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* The callback prototype used with cogl_pipeline_foreach_layer() for
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* iterating all the layers of a @pipeline.
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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typedef CoglBool (*CoglPipelineLayerCallback) (CoglPipeline *pipeline,
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int layer_index,
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void *user_data);
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/**
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* cogl_pipeline_foreach_layer:
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* @pipeline: A #CoglPipeline object
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* @callback: (scope call): A #CoglPipelineLayerCallback to be
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* called for each layer index
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* @user_data: (closure): Private data that will be passed to the
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* callback
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*
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* Iterates all the layer indices of the given @pipeline.
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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void
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cogl_pipeline_foreach_layer (CoglPipeline *pipeline,
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CoglPipelineLayerCallback callback,
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void *user_data);
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/**
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* cogl_pipeline_get_uniform_location:
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* @pipeline: A #CoglPipeline object
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* @uniform_name: The name of a uniform
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*
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* This is used to get an integer representing the uniform with the
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* name @uniform_name. The integer can be passed to functions such as
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* cogl_pipeline_set_uniform_1f() to set the value of a uniform.
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*
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* This function will always return a valid integer. Ie, unlike
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* OpenGL, it does not return -1 if the uniform is not available in
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* this pipeline so it can not be used to test whether uniforms are
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* present. It is not necessary to set the program on the pipeline
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* before calling this function.
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*
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* Return value: A integer representing the location of the given uniform.
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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int
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cogl_pipeline_get_uniform_location (CoglPipeline *pipeline,
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const char *uniform_name);
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#endif /* COGL_ENABLE_EXPERIMENTAL_API */
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COGL_END_DECLS
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#endif /* __COGL_PIPELINE_H__ */
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