#if !defined(PGOPENGL_H) #define PGOPENGL_H /** This header includes definitions of Opengl functions as pointer types for ** use with the SDL function SDL_GL_GetProcAddress. **/ #if defined(_WIN32) #define GL_APIENTRY __stdcall #else #define GL_APIENTRY #endif typedef void (GL_APIENTRY *GL_glReadPixels_Func)(int, int, int, int, unsigned int, unsigned int, void*); #endif