/**
* \file gl_common.c
* \brief OpenGL helper functions used by vo_gl.c and vo_gl2.c
*
* Common OpenGL routines.
* Copyleft (C) Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>, 2005
* Licensed under the GNU GPL v2 or later.
* Special thanks go to the xine team and Matthias Hopf, whose video_out_opengl.c
* gave me lots of good ideas.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "gl_common.h"
/**
* \defgroup glextfunctions OpenGL extension functions
*
* the pointers to these functions are acquired when the OpenGL
* context is created
* \{
*/
void (APIENTRY *GenBuffers)(GLsizei, GLuint *);
void (APIENTRY *DeleteBuffers)(GLsizei, const GLuint *);
void (APIENTRY *BindBuffer)(GLenum, GLuint);
GLvoid* (APIENTRY *MapBuffer)(GLenum, GLenum);
GLboolean (APIENTRY *UnmapBuffer)(GLenum);
void (APIENTRY *BufferData)(GLenum, intptr_t, const GLvoid *, GLenum);
void (APIENTRY *CombinerParameterfv)(GLenum, const GLfloat *);
void (APIENTRY *CombinerParameteri)(GLenum, GLint);
void (APIENTRY *CombinerInput)(GLenum, GLenum, GLenum, GLenum, GLenum,
GLenum);
void (APIENTRY *CombinerOutput)(GLenum, GLenum, GLenum, GLenum, GLenum,
GLenum, GLenum, GLboolean, GLboolean,
GLboolean);
void (APIENTRY *BeginFragmentShader)(void);
void (APIENTRY *EndFragmentShader)(void);
void (APIENTRY *SampleMap)(GLuint, GLuint, GLenum);
void (APIENTRY *ColorFragmentOp2)(GLenum, GLuint, GLuint, GLuint, GLuint,
GLuint, GLuint, GLuint, GLuint, GLuint);
void (APIENTRY *ColorFragmentOp3)(GLenum, GLuint, GLuint, GLuint, GLuint,
GLuint, GLuint, GLuint, GLuint, GLuint,
GLuint, GLuint, GLuint);
void (APIENTRY *SetFragmentShaderConstant)(GLuint, const GLfloat *);
void (APIENTRY *ActiveTexture)(GLenum);
void (APIENTRY *BindTexture)(GLen
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