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5f0a57ffdb
This adds a documentation section for CoglSnippet which gives an overview of how to use them. It also fixes some syntax errors in the existing documentation and adds the missing pipeline functions for adding snippets to the documentation sections file. Reviewed-by: Robert Bragg <robert@linux.intel.com>
655 lines
20 KiB
C
655 lines
20 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) 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(CLUTTER_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_SHADER_H__
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#define __COGL_SHADER_H__
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-defines.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-shaders
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* @short_description: Fuctions for accessing the programmable GL pipeline
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*
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* Cogl allows accessing the GL programmable pipeline in order to create
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* vertex and fragment shaders.
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*
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* The shader source code can either be GLSL or ARBfp. If the source
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* code is ARBfp, it must begin with the string “!!ARBfp1.0”. The
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* application should check for the %COGL_FEATURE_SHADERS_GLSL or
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* %COGL_FEATURE_SHADERS_ARBFP features before using shaders.
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*
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* When using GLSL Cogl provides replacement names for most of the
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* builtin varyings and uniforms. It is recommended to use these names
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* wherever possible to increase portability between OpenGL 2.0 and
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* GLES 2.0. GLES 2.0 does not have most of the builtins under their
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* original names so they will only work with the Cogl names.
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*
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* For use in all GLSL shaders, the Cogl builtins are as follows:
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*
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* <tip>
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* <glosslist>
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* <glossentry>
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* <glossterm>uniform mat4
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* <emphasis>cogl_modelview_matrix</emphasis></glossterm>
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* <glossdef><para>
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* The current modelview matrix. This is equivalent to
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* #gl_ModelViewMatrix.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>uniform mat4
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* <emphasis>cogl_projection_matrix</emphasis></glossterm>
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* <glossdef><para>
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* The current projection matrix. This is equivalent to
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* #gl_ProjectionMatrix.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>uniform mat4
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* <emphasis>cogl_modelview_projection_matrix</emphasis></glossterm>
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* <glossdef><para>
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* The combined modelview and projection matrix. A vertex shader
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* would typically use this to transform the incoming vertex
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* position. The separate modelview and projection matrices are
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* usually only needed for lighting calculations. This is
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* equivalent to #gl_ModelViewProjectionMatrix.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>uniform mat4
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* <emphasis>cogl_texture_matrix</emphasis>[]</glossterm>
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* <glossdef><para>
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* An array of matrices for transforming the texture
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* coordinates. This is equivalent to #gl_TextureMatrix.
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* </para></glossdef>
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* </glossentry>
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* </glosslist>
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* </tip>
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*
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* In a vertex shader, the following are also available:
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*
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* <tip>
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* <glosslist>
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* <glossentry>
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* <glossterm>attribute vec4
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* <emphasis>cogl_position_in</emphasis></glossterm>
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* <glossdef><para>
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* The incoming vertex position. This is equivalent to #gl_Vertex.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>attribute vec4
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* <emphasis>cogl_color_in</emphasis></glossterm>
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* <glossdef><para>
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* The incoming vertex color. This is equivalent to #gl_Color.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>attribute vec4
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* <emphasis>cogl_tex_coord_in</emphasis></glossterm>
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* <glossdef><para>
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* The texture coordinate for the first texture unit. This is
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* equivalent to #gl_MultiTexCoord0.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>attribute vec4
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* <emphasis>cogl_tex_coord0_in</emphasis></glossterm>
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* <glossdef><para>
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* The texture coordinate for the first texture unit. This is
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* equivalent to #gl_MultiTexCoord0. There is also
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* #cogl_tex_coord1_in and so on.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>attribute vec3
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* <emphasis>cogl_normal_in</emphasis></glossterm>
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* <glossdef><para>
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* The normal of the vertex. This is equivalent to #gl_Normal.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>vec4
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* <emphasis>cogl_position_out</emphasis></glossterm>
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* <glossdef><para>
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* The calculated position of the vertex. This must be written to
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* in all vertex shaders. This is equivalent to #gl_Position.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>float
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* <emphasis>cogl_point_size_out</emphasis></glossterm>
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* <glossdef><para>
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* The calculated size of a point. This is equivalent to #gl_PointSize.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>varying vec4
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* <emphasis>cogl_color_out</emphasis></glossterm>
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* <glossdef><para>
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* The calculated color of a vertex. This is equivalent to #gl_FrontColor.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>varying vec4
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* <emphasis>cogl_tex_coord_out</emphasis>[]</glossterm>
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* <glossdef><para>
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* An array of calculated texture coordinates for a vertex. This is
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* equivalent to #gl_TexCoord.
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* </para></glossdef>
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* </glossentry>
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* </glosslist>
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* </tip>
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*
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* In a fragment shader, the following are also available:
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*
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* <tip>
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* <glosslist>
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* <glossentry>
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* <glossterm>varying vec4 <emphasis>cogl_color_in</emphasis></glossterm>
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* <glossdef><para>
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* The calculated color of a vertex. This is equivalent to #gl_FrontColor.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>varying vec4
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* <emphasis>cogl_tex_coord_in</emphasis>[]</glossterm>
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* <glossdef><para>
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* An array of calculated texture coordinates for a vertex. This is
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* equivalent to #gl_TexCoord.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>vec4 <emphasis>cogl_color_out</emphasis></glossterm>
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* <glossdef><para>
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* The final calculated color of the fragment. All fragment shaders
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* must write to this variable. This is equivalent to
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* #gl_FrontColor.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>float <emphasis>cogl_depth_out</emphasis></glossterm>
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* <glossdef><para>
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* An optional output variable specifying the depth value to use
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* for this fragment. This is equivalent to #gl_FragDepth.
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* </para></glossdef>
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* </glossentry>
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* <glossentry>
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* <glossterm>bool <emphasis>cogl_front_facing</emphasis></glossterm>
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* <glossdef><para>
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* A readonly variable that will be true if the current primitive
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* is front facing. This can be used to implement two-sided
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* coloring algorithms. This is equivalent to #gl_FrontFacing.
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* </para></glossdef>
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* </glossentry>
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* </glosslist>
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* </tip>
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*
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* It's worth nothing that this API isn't what Cogl would like to have
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* in the long term and it may be removed in Cogl 2.0. The
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* experimental #CoglShader API is the proposed replacement.
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*/
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/**
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* CoglShaderType:
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* @COGL_SHADER_TYPE_VERTEX: A program for proccessing vertices
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* @COGL_SHADER_TYPE_FRAGMENT: A program for processing fragments
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*
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* Types of shaders
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*
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* Since: 1.0
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*/
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typedef enum {
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COGL_SHADER_TYPE_VERTEX,
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COGL_SHADER_TYPE_FRAGMENT
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} CoglShaderType;
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/**
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* cogl_create_shader:
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* @shader_type: COGL_SHADER_TYPE_VERTEX or COGL_SHADER_TYPE_FRAGMENT.
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*
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* Create a new shader handle, use cogl_shader_source() to set the
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* source code to be used on it.
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*
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* Returns: a new shader handle.
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*/
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CoglHandle
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cogl_create_shader (CoglShaderType shader_type);
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#ifndef COGL_DISABLE_DEPRECATED
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/**
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* cogl_shader_ref:
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* @handle: A #CoglHandle to a shader.
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*
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* Add an extra reference to a shader.
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*
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* Deprecated: 1.0: Please use cogl_handle_ref() instead.
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*
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* Returns: @handle
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*/
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CoglHandle
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cogl_shader_ref (CoglHandle handle) G_GNUC_DEPRECATED;
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/**
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* cogl_shader_unref:
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* @handle: A #CoglHandle to a shader.
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*
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* Removes a reference to a shader. If it was the last reference the
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* shader object will be destroyed.
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*
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* Deprecated: 1.0: Please use cogl_handle_unref() instead.
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*/
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void
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cogl_shader_unref (CoglHandle handle) G_GNUC_DEPRECATED;
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#endif /* COGL_DISABLE_DEPRECATED */
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/**
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* cogl_is_shader:
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* @handle: A CoglHandle
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*
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* Gets whether the given handle references an existing shader object.
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*
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* Returns: %TRUE if the handle references a shader,
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* %FALSE otherwise
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*/
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gboolean
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cogl_is_shader (CoglHandle handle);
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/**
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* cogl_shader_source:
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* @shader: #CoglHandle for a shader.
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* @source: Shader source.
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*
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* Replaces the current source associated with a shader with a new
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* one.
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*
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* Please see <link
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* linkend="cogl-Shaders-and-Programmable-Pipeline.description">above</link>
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* for a description of the recommended format for the shader code.
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*/
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void
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cogl_shader_source (CoglHandle shader,
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const char *source);
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/**
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* cogl_shader_compile:
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* @handle: #CoglHandle for a shader.
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*
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* Compiles the shader, no return value, but the shader is now ready
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* for linking into a program. Note that calling this function is
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* optional. If it is not called then the shader will be automatically
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* compiled when it is linked.
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*/
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void
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cogl_shader_compile (CoglHandle handle);
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/**
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* cogl_shader_get_info_log:
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* @handle: #CoglHandle for a shader.
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*
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* Retrieves the information log for a coglobject, can be used in conjunction
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* with cogl_shader_get_parameteriv() to retrieve the compiler warnings/error
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* messages that caused a shader to not compile correctly, mainly useful for
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* debugging purposes.
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*
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* Return value: a newly allocated string containing the info log. Use
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* g_free() to free it
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*/
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char *
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cogl_shader_get_info_log (CoglHandle handle);
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/**
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* cogl_shader_get_type:
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* @handle: #CoglHandle for a shader.
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*
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* Retrieves the type of a shader #CoglHandle
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*
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* Return value: %COGL_SHADER_TYPE_VERTEX if the shader is a vertex processor
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* or %COGL_SHADER_TYPE_FRAGMENT if the shader is a frament processor
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*/
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CoglShaderType
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cogl_shader_get_type (CoglHandle handle);
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/**
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* cogl_shader_is_compiled:
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* @handle: #CoglHandle for a shader.
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*
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* Retrieves whether a shader #CoglHandle has been compiled
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*
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* Return value: %TRUE if the shader object has sucessfully be compiled
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*/
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gboolean
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cogl_shader_is_compiled (CoglHandle handle);
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/**
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* cogl_create_program:
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*
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* Create a new cogl program object that can be used to replace parts of the GL
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* rendering pipeline with custom code.
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*
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* Returns: a new cogl program.
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*/
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CoglHandle
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cogl_create_program (void);
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#ifndef COGL_DISABLE_DEPRECATED
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/**
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* cogl_program_ref:
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* @handle: A #CoglHandle to a program.
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*
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* Add an extra reference to a program.
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*
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* Deprecated: 1.0: Please use cogl_handle_ref() instead.
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*
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* Returns: @handle
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*/
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CoglHandle
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cogl_program_ref (CoglHandle handle) G_GNUC_DEPRECATED;
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/**
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* cogl_program_unref:
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* @handle: A #CoglHandle to a program.
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*
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* Removes a reference to a program. If it was the last reference the
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* program object will be destroyed.
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*
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* Deprecated: 1.0: Please use cogl_handle_unref() instead.
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*/
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void
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cogl_program_unref (CoglHandle handle) G_GNUC_DEPRECATED;
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#endif /* COGL_DISABLE_DEPRECATED */
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/**
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* cogl_is_program:
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* @handle: A CoglHandle
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*
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* Gets whether the given handle references an existing program object.
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*
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* Returns: %TRUE if the handle references a program,
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* %FALSE otherwise
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*/
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gboolean
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cogl_is_program (CoglHandle handle);
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/**
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* cogl_program_attach_shader:
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* @program_handle: a #CoglHandle for a shdaer program.
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* @shader_handle: a #CoglHandle for a vertex of fragment shader.
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*
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* Attaches a shader to a program object. A program can have multiple
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* vertex or fragment shaders but only one of them may provide a
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* main() function. It is allowed to use a program with only a vertex
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* shader or only a fragment shader.
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*/
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void
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cogl_program_attach_shader (CoglHandle program_handle,
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CoglHandle shader_handle);
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/**
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* cogl_program_link:
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* @handle: a #CoglHandle for a shader program.
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*
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* Links a program making it ready for use. Note that calling this
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* function is optional. If it is not called the program will
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* automatically be linked the first time it is used.
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*/
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void
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cogl_program_link (CoglHandle handle);
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/**
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* cogl_program_use:
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* @handle: a #CoglHandle for a shader program or %COGL_INVALID_HANDLE.
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*
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* Activate a specific shader program replacing that part of the GL
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* rendering pipeline, if passed in %COGL_INVALID_HANDLE the default
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* behavior of GL is reinstated.
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*
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* This function affects the global state of the current Cogl
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* context. It is much more efficient to attach the shader to a
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* specific material used for rendering instead by calling
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* cogl_material_set_user_program().
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*/
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void
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cogl_program_use (CoglHandle handle);
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/**
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* cogl_program_get_uniform_location:
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* @handle: a #CoglHandle for a shader program.
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* @uniform_name: the name of a uniform.
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*
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* Retrieve the location (offset) of a uniform variable in a shader program,
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* a uniform is a variable that is constant for all vertices/fragments for a
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* shader object and is possible to modify as an external parameter.
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*
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* Return value: the offset of a uniform in a specified program.
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* This uniform can be set using cogl_program_uniform_1f() when the
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* program is in use.
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*/
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int
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cogl_program_get_uniform_location (CoglHandle handle,
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const char *uniform_name);
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/**
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* cogl_program_set_uniform_1f:
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* @program: A #CoglHandle for a linked program
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* @uniform_location: the uniform location retrieved from
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* cogl_program_get_uniform_location().
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* @value: the new value of the uniform.
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*
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* Changes the value of a floating point uniform for the given linked
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* @program.
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*
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* Since: 1.4
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*/
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void
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cogl_program_set_uniform_1f (CoglHandle program,
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int uniform_location,
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float value);
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/**
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* cogl_program_set_uniform_1i:
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* @program: A #CoglHandle for a linked program
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* @uniform_location: the uniform location retrieved from
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* cogl_program_get_uniform_location().
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* @value: the new value of the uniform.
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*
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* Changes the value of an integer uniform for the given linked
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* @program.
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*
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* Since: 1.4
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*/
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void
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cogl_program_set_uniform_1i (CoglHandle program,
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int uniform_location,
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int value);
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/**
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* cogl_program_set_uniform_float:
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* @program: A #CoglHandle for a linked program
|
|
* @uniform_location: the uniform location retrieved from
|
|
* cogl_program_get_uniform_location().
|
|
* @n_components: The number of components for the uniform. For
|
|
* example with glsl you'd use 3 for a vec3 or 4 for a vec4.
|
|
* @count: For uniform arrays this is the array length otherwise just
|
|
* pass 1
|
|
* @value: (array length=count): the new value of the uniform[s].
|
|
*
|
|
* Changes the value of a float vector uniform, or uniform array for
|
|
* the given linked @program.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
cogl_program_set_uniform_float (CoglHandle program,
|
|
int uniform_location,
|
|
int n_components,
|
|
int count,
|
|
const float *value);
|
|
|
|
/**
|
|
* cogl_program_set_uniform_int:
|
|
* @program: A #CoglHandle for a linked program
|
|
* @uniform_location: the uniform location retrieved from
|
|
* cogl_program_get_uniform_location().
|
|
* @n_components: The number of components for the uniform. For
|
|
* example with glsl you'd use 3 for a vec3 or 4 for a vec4.
|
|
* @count: For uniform arrays this is the array length otherwise just
|
|
* pass 1
|
|
* @value: (array length=count): the new value of the uniform[s].
|
|
*
|
|
* Changes the value of a int vector uniform, or uniform array for
|
|
* the given linked @program.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
cogl_program_set_uniform_int (CoglHandle program,
|
|
int uniform_location,
|
|
int n_components,
|
|
int count,
|
|
const int *value);
|
|
|
|
/**
|
|
* cogl_program_set_uniform_matrix:
|
|
* @program: A #CoglHandle for a linked program
|
|
* @uniform_location: the uniform location retrieved from
|
|
* cogl_program_get_uniform_location().
|
|
* @dimensions: The dimensions of the matrix. So for for example pass
|
|
* 2 for a 2x2 matrix or 3 for 3x3.
|
|
* @count: For uniform arrays this is the array length otherwise just
|
|
* pass 1
|
|
* @transpose: Whether to transpose the matrix when setting the uniform.
|
|
* @value: (array length=count): the new value of the uniform.
|
|
*
|
|
* Changes the value of a matrix uniform, or uniform array in the
|
|
* given linked @program.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
cogl_program_set_uniform_matrix (CoglHandle program,
|
|
int uniform_location,
|
|
int dimensions,
|
|
int count,
|
|
gboolean transpose,
|
|
const float *value);
|
|
|
|
#ifndef COGL_DISABLE_DEPRECATED
|
|
|
|
/**
|
|
* cogl_program_uniform_1f:
|
|
* @uniform_no: the uniform to set.
|
|
* @value: the new value of the uniform.
|
|
*
|
|
* Changes the value of a floating point uniform in the currently
|
|
* used (see cogl_program_use()) shader program.
|
|
*
|
|
* Deprecated: 1.4: Use cogl_program_set_uniform_1f() instead.
|
|
*/
|
|
void
|
|
cogl_program_uniform_1f (int uniform_no,
|
|
float value) G_GNUC_DEPRECATED;
|
|
|
|
/**
|
|
* cogl_program_uniform_1i:
|
|
* @uniform_no: the uniform to set.
|
|
* @value: the new value of the uniform.
|
|
*
|
|
* Changes the value of an integer uniform in the currently
|
|
* used (see cogl_program_use()) shader program.
|
|
*
|
|
* Deprecated: 1.4: Use cogl_program_set_uniform_1i() instead.
|
|
*/
|
|
void
|
|
cogl_program_uniform_1i (int uniform_no,
|
|
int value) G_GNUC_DEPRECATED;
|
|
|
|
/**
|
|
* cogl_program_uniform_float:
|
|
* @uniform_no: the uniform to set.
|
|
* @size: Size of float vector.
|
|
* @count: Size of array of uniforms.
|
|
* @value: (array length=count): the new value of the uniform.
|
|
*
|
|
* Changes the value of a float vector uniform, or uniform array in the
|
|
* currently used (see cogl_program_use()) shader program.
|
|
*
|
|
* Deprecated: 1.4: Use cogl_program_set_uniform_float() instead.
|
|
*/
|
|
void
|
|
cogl_program_uniform_float (int uniform_no,
|
|
int size,
|
|
int count,
|
|
const float *value) G_GNUC_DEPRECATED;
|
|
|
|
/**
|
|
* cogl_program_uniform_int:
|
|
* @uniform_no: the uniform to set.
|
|
* @size: Size of int vector.
|
|
* @count: Size of array of uniforms.
|
|
* @value: (array length=count): the new value of the uniform.
|
|
*
|
|
* Changes the value of a int vector uniform, or uniform array in the
|
|
* currently used (see cogl_program_use()) shader program.
|
|
*/
|
|
void
|
|
cogl_program_uniform_int (int uniform_no,
|
|
int size,
|
|
int count,
|
|
const int *value) G_GNUC_DEPRECATED;
|
|
|
|
/**
|
|
* cogl_program_uniform_matrix:
|
|
* @uniform_no: the uniform to set.
|
|
* @size: Size of matrix.
|
|
* @count: Size of array of uniforms.
|
|
* @transpose: Whether to transpose the matrix when setting the uniform.
|
|
* @value: (array length=count): the new value of the uniform.
|
|
*
|
|
* Changes the value of a matrix uniform, or uniform array in the
|
|
* currently used (see cogl_program_use()) shader program. The @size
|
|
* parameter is used to determine the square size of the matrix.
|
|
*/
|
|
void
|
|
cogl_program_uniform_matrix (int uniform_no,
|
|
int size,
|
|
int count,
|
|
gboolean transpose,
|
|
const float *value) G_GNUC_DEPRECATED;
|
|
|
|
#endif /* COGL_DISABLE_DEPRECATED */
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_SHADER_H__ */
|