GTKSetup.h

// source: https://github.com/aklomp/gtk3-opengl/blob/master/program.c
#include <GL/gl.h>
 
void initProgram (void);
void programs_init (void);
void program_cube_use (void);
void program_bkgd_use (void);
 
enum LocBkgd {
    LOC_BKGD_VERTEX,
    LOC_BKGD_TEXTURE,
};
 
enum LocCube {
    LOC_CUBE_VIEW,
    LOC_CUBE_MODEL,
    LOC_CUBE_VERTEX,
    LOC_CUBE_VCOLOR,
    LOC_CUBE_NORMAL,
};
 
GLint program_bkgd_loc (const enum LocBkgd);
GLint program_cube_loc (const enum LocCube);