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6db0d42193
COGLenum, COGLint and COGLuint which were simply typedefs for GL{enum,int,uint}
have been removed from the API and replaced with specialised enum typedefs, int
and unsigned int. These were causing problems for generating bindings and also
considered poor style.
The cogl texture filter defines CGL_NEAREST and CGL_LINEAR etc are now replaced
by a namespaced typedef 'CoglTextureFilter' so they should be replaced with
COGL_TEXTURE_FILTER_NEAREST and COGL_TEXTURE_FILTER_LINEAR etc.
The shader type defines CGL_VERTEX_SHADER and CGL_FRAGMENT_SHADER are handled by
a CoglShaderType typedef and should be replaced with COGL_SHADER_TYPE_VERTEX and
COGL_SHADER_TYPE_FRAGMENT.
cogl_shader_get_parameteriv has been replaced by cogl_shader_get_type and
cogl_shader_is_compiled. More getters can be added later if desired.
308 lines
9.7 KiB
C
308 lines
9.7 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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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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 only supported format is GLSL shaders.
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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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typedef enum _CoglShaderType
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{
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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: CGL_VERTEX_SHADER or CGL_FRAGMENT_SHADER.
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*
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* Create a new shader handle, use #cogl_shader_source to set the source code
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* 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 cogl_create_shader (CoglShaderType shader_type);
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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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* Returns: @handle
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*/
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CoglHandle cogl_shader_ref (CoglHandle handle);
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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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void cogl_shader_unref (CoglHandle handle);
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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 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: GLSL shader source.
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*
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* Replaces the current GLSL source associated with a shader with a new
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* one.
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*/
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void 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 for
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* linking into a program.
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*/
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void 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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* @size: maximum number of bytes to retrieve.
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* @buffer: location for info log.
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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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void cogl_shader_get_info_log (CoglHandle handle,
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size_t size,
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char *buffer);
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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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* Returns: 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 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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* Returns: TRUE if the shader object has sucessfully be compiled else FALSE
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*/
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gboolean 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 cogl_create_program (void);
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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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* Returns: @handle
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*/
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CoglHandle cogl_program_ref (CoglHandle handle);
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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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void cogl_program_unref (CoglHandle handle);
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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 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 one vertex shader
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* and one fragment shader attached.
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*/
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void 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.
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*/
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void 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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void 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 cogl_program_get_uniform_location
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(CoglHandle handle,
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const char *uniform_name);
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/**
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* cogl_program_uniform_1f:
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* @uniform_no: the unform to set.
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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 in the currently
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* used (see cogl_program_use()) shader program.
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*/
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void cogl_program_uniform_1f (int uniform_no,
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float value);
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/**
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* cogl_program_uniform_1i:
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* @uniform_no: the unform to set.
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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 in the currently
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* used (see cogl_program_use()) shader program.
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*/
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void cogl_program_uniform_1i (int uniform_no,
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int value);
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/**
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* cogl_program_uniform_float:
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* @uniform_no: the uniform to set.
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* @size: Size of float vector.
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* @count: Size of array of uniforms.
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* @value: the new value of the uniform.
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*
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* Changes the value of a float vector uniform, or uniform array in the
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* currently used (see #cogl_program_use) shader program.
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*/
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void cogl_program_uniform_float (int uniform_no,
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int size,
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int count,
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const GLfloat *value);
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/**
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* cogl_program_uniform_int:
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* @uniform_no: the uniform to set.
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* @size: Size of int vector.
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* @count: Size of array of uniforms.
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* @value: the new value of the uniform.
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*
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* Changes the value of a int vector uniform, or uniform array in the
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* currently used (see cogl_program_use()) shader program.
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*/
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void cogl_program_uniform_int (int uniform_no,
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int size,
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int count,
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const int *value);
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/**
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* cogl_program_uniform_matrix:
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* @uniform_no: the uniform to set.
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* @size: Size of matrix.
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* @count: Size of array of uniforms.
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* @transpose: Whether to transpose the matrix when setting the uniform.
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* @value: the new value of the uniform.
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*
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* Changes the value of a matrix uniform, or uniform array in the
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* currently used (see cogl_program_use()) shader program. The @size
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* parameter is used to determine the square size of the matrix.
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*/
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void cogl_program_uniform_matrix (int uniform_no,
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int size,
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int count,
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gboolean transpose,
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const float *value);
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G_END_DECLS
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#endif /* __COGL_SHADER_H__ */
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