gl_context.h

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 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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 */
 
#ifndef _GL_CONTEXT_H_
#define _GL_CONTEXT_H_
 
#if defined __linux__ || defined _WIN32
#include <GL/glew.h>
#else
#include <OpenGL/GL.h>
#endif /*  __linux__  */
 
#ifdef __APPLE__
#include <Availability.h>
#endif
 
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
 
#if defined __APPLE__ && ! defined __MAC_10_8
#define glGenFramebuffers glGenFramebuffersEXT
#define glBindFramebuffer glBindFramebufferEXT
#define GL_FRAMEBUFFER GL_FRAMEBUFFER_EXT
#define glFramebufferTexture2D glFramebufferTexture2DEXT
#define glDeleteFramebuffers glDeleteFramebuffersEXT
#define GL_FRAMEBUFFER_COMPLETE GL_FRAMEBUFFER_COMPLETE_EXT
#define glCheckFramebufferStatus glCheckFramebufferStatusEXT
#endif
 
struct gl_context {
        unsigned legacy:1;
        void *context;
        int gl_major;
        int gl_minor;
};
 
#define GL_CONTEXT_ANY 0x00
#define GL_CONTEXT_LEGACY 0x01
 
bool init_gl_context(struct gl_context *context, int which);
void gl_context_make_current(struct gl_context *context);
void destroy_gl_context(struct gl_context *context);
 
#define gl_check_error() do { \
        GLenum msg = glGetError(); \
        int flag = 1; \
        switch(msg){ \
                case GL_NO_ERROR: \
                        flag = 0; \
                        break; \
                case GL_INVALID_ENUM: \
                        fprintf(stderr, "GL_INVALID_ENUM\n"); \
                        break; \
                case GL_INVALID_VALUE: \
                        fprintf(stderr, "GL_INVALID_VALUE\n"); \
                        break; \
                case GL_INVALID_OPERATION: \
                        fprintf(stderr, "GL_INVALID_OPERATION\n"); \
                        break; \
                case GL_STACK_OVERFLOW: \
                        fprintf(stderr, "GL_STACK_OVERFLOW\n"); \
                        break; \
                case GL_STACK_UNDERFLOW: \
                        fprintf(stderr, "GL_STACK_UNDERFLOW\n"); \
                         break; \
                case GL_OUT_OF_MEMORY: \
                        fprintf(stderr, "GL_OUT_OF_MEMORY\n"); \
                        break; \
                case 1286: \
                        fprintf(stderr, "INVALID_FRAMEBUFFER_OPERATION_EXT\n"); \
                        break; \
                default: \
                        fprintf(stderr, "wft mate? Unknown GL ERROR: %d\n", msg); \
                break; \
        } \
        if(flag) { \
                fprintf(stderr, "\tat %s:%d: %s\n", __FILE__, __LINE__, __func__); \
                abort(); \
        } \
} while(0)
 
GLuint glsl_compile_link(const char *vprogram, const char *fprogram);
 
#ifdef __cplusplus
}
#endif // __cplusplus
 
#endif /* _GL_CONTEXT_H_ */