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oglfunc.h
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#ifndef OGLFUNC_H
#define OGLFUNC_H
#if defined(_MSC_VER)
#include <windows.h>
#endif
#if defined(USE_OPENGL_ES)
#include <SDL3/SDL_opengles.h>
// OpenGL compatibility
typedef GLclampf GLclampd;
typedef GLfloat GLdouble;
#else
#include <SDL3/SDL_opengl.h>
#endif
#if !defined(GL_CLAMP_TO_EDGE)
// Originally added by GL_SGIS_texture_edge_clamp; part of OpenGL 1.2 core.
#define GL_CLAMP_TO_EDGE 0x812F
#endif
#if !defined(APIENTRY)
#define APIENTRY
#endif
typedef void (APIENTRY *PFNGLALPHAFUNCPROC)(GLenum, GLclampf);
typedef void (APIENTRY *PFNGLBINDTEXTUREPROC)(GLenum, GLuint);
typedef void (APIENTRY *PFNGLBLENDFUNCPROC)(GLenum, GLenum);
typedef void (APIENTRY *PFNGLCLEARPROC)(GLbitfield);
typedef void (APIENTRY *PFNGLCLEARCOLORPROC)(GLclampf, GLclampf, GLclampf, GLclampf);
typedef void (APIENTRY *PFNGLCOLOR4FPROC)(GLfloat, GLfloat, GLfloat, GLfloat);
typedef void (APIENTRY *PFNGLCOLORPOINTERPROC)(GLint, GLenum, GLsizei, const GLvoid *);
typedef void (APIENTRY *PFNGLCULLFACEPROC)(GLenum);
typedef void (APIENTRY *PFNGLDELETETEXTURESPROC)(GLsizei,const GLuint*);
typedef void (APIENTRY *PFNGLDEPTHFUNCPROC)(GLenum);
typedef void (APIENTRY *PFNGLDEPTHMASKPROC)(GLboolean);
typedef void (APIENTRY *PFNGLDEPTHRANGEPROC)(GLclampd, GLclampd);
typedef void (APIENTRY *PFNGLDISABLEPROC)(GLenum);
typedef void (APIENTRY *PFNGLDISABLECLIENTSTATEPROC)(GLenum);
typedef void (APIENTRY *PFNGLDRAWELEMENTSPROC)(GLenum, GLsizei, GLenum, const GLvoid *);
typedef void (APIENTRY *PFNGLENABLEPROC)(GLenum);
typedef void (APIENTRY *PFNGLENABLECLIENTSTATEPROC)(GLenum);
typedef void (APIENTRY *PFNGLFRONTFACEPROC)(GLenum);
typedef void (APIENTRY *PFNGLGENTEXTURESPROC)(GLsizei,GLuint*);
typedef GLenum (APIENTRY *PFNGLGETERRORPROC)(void);
typedef void (APIENTRY *PFNGLGETFLOATVPROC)(GLenum, GLfloat *);
typedef void (APIENTRY *PFNGLGETINTEGERVPROC)(GLenum, GLint *);
typedef const GLubyte* (APIENTRY *PFNGLGETSTRINGPROC)(GLenum);
typedef void (APIENTRY *PFNGLGETTEXPARAMETERFVPROC)(GLenum, GLenum, GLfloat*);
typedef void (APIENTRY *PFNGLHINTPROC)(GLenum, GLenum);
typedef void (APIENTRY *PFNGLPIXELSTOREIPROC)(GLenum, GLint);
typedef void (APIENTRY *PFNGLPOLYGONOFFSETPROC)(GLfloat, GLfloat);
typedef void (APIENTRY *PFNGLREADPIXELSPROC)(GLint, GLint, GLsizei, GLsizei, GLenum, GLenum, GLvoid *);
typedef void (APIENTRY *PFNGLSHADEMODELPROC)(GLenum);
typedef void (APIENTRY *PFNGLTEXCOORDPOINTERPROC)(GLint, GLenum, GLsizei, const GLvoid *);
typedef void (APIENTRY *PFNGLTEXENVFPROC)(GLenum, GLenum, GLfloat);
typedef void (APIENTRY *PFNGLTEXENVFVPROC)(GLenum, GLenum, const GLfloat *);
typedef void (APIENTRY *PFNGLTEXENVIPROC)(GLenum, GLenum, GLint);
typedef void (APIENTRY *PFNGLTEXIMAGE2DPROC)(GLenum,GLint,GLint,GLsizei,GLsizei,GLint,GLenum,GLenum,const GLvoid*);
typedef void (APIENTRY *PFNGLTEXPARAMETERFPROC)(GLenum, GLenum, GLfloat);
typedef void (APIENTRY *PFNGLTEXPARAMETERIPROC)(GLenum, GLenum, GLint);
typedef void (APIENTRY *PFNGLTEXSUBIMAGE2DPROC)(GLenum,GLint,GLint,GLint,GLsizei,GLsizei,GLenum,GLenum,const GLvoid*);
typedef void (APIENTRY *PFNGLVERTEXPOINTERPROC)(GLint, GLenum, GLsizei, const GLvoid *);
typedef void (APIENTRY *PFNGLVIEWPORTPROC)(GLint, GLint, GLsizei, GLsizei);
extern PFNGLALPHAFUNCPROC pglAlphaFunc;
extern PFNGLBINDTEXTUREPROC pglBindTexture;
extern PFNGLBLENDFUNCPROC pglBlendFunc;
extern PFNGLCLEARPROC pglClear;
extern PFNGLCLEARCOLORPROC pglClearColor;
extern PFNGLCOLOR4FPROC pglColor4f;
extern PFNGLCOLORPOINTERPROC pglColorPointer;
extern PFNGLCULLFACEPROC pglCullFace;
extern PFNGLDELETETEXTURESPROC pglDeleteTextures;
extern PFNGLDEPTHFUNCPROC pglDepthFunc;
extern PFNGLDEPTHMASKPROC pglDepthMask;
extern PFNGLDEPTHRANGEPROC pglDepthRange;
extern PFNGLDISABLEPROC pglDisable;
extern PFNGLDISABLECLIENTSTATEPROC pglDisableClientState;
extern PFNGLDRAWELEMENTSPROC pglDrawElements;
extern PFNGLENABLEPROC pglEnable;
extern PFNGLENABLECLIENTSTATEPROC pglEnableClientState;
extern PFNGLFRONTFACEPROC pglFrontFace;
extern PFNGLGENTEXTURESPROC pglGenTextures;
extern PFNGLGETERRORPROC pglGetError;
extern PFNGLGETFLOATVPROC pglGetFloatv;
extern PFNGLGETINTEGERVPROC pglGetIntegerv;
extern PFNGLGETSTRINGPROC pglGetString;
extern PFNGLGETTEXPARAMETERFVPROC pglGetTexParameterfv;
extern PFNGLHINTPROC pglHint;
extern PFNGLPIXELSTOREIPROC pglPixelStorei;
extern PFNGLPOLYGONOFFSETPROC pglPolygonOffset;
extern PFNGLREADPIXELSPROC pglReadPixels;
extern PFNGLSHADEMODELPROC pglShadeModel;
extern PFNGLTEXCOORDPOINTERPROC pglTexCoordPointer;
extern PFNGLTEXENVFPROC pglTexEnvf;
extern PFNGLTEXENVFVPROC pglTexEnvfv;
extern PFNGLTEXENVIPROC pglTexEnvi;
extern PFNGLTEXIMAGE2DPROC pglTexImage2D;
extern PFNGLTEXPARAMETERFPROC pglTexParameterf;
extern PFNGLTEXPARAMETERIPROC pglTexParameteri;
extern PFNGLTEXSUBIMAGE2DPROC pglTexSubImage2D;
extern PFNGLVERTEXPOINTERPROC pglVertexPointer;
extern PFNGLVIEWPORTPROC pglViewport;
extern int ogl_have_multisample_filter_hint;
extern int ogl_have_texture_filter_anisotropic;
extern int ogl_use_multisample_filter_hint;
extern int ogl_use_texture_filter_anisotropic;
extern void load_ogl_functions(int mode);
extern int check_for_errors_(const char *file, int line);
#define check_for_errors() check_for_errors_(__FILE__, __LINE__)
#endif