ok now it works nicely in VR

[vrtris] / src / opengl.h

#ifndef OPENGL_H_
#define OPENGL_H_

#include <GL/glew.h>

struct GLCaps {
        int debug;      /* ARB_debug_output */
};

extern struct GLCaps glcaps;

int init_opengl(void);

void dump_gl_texture(unsigned int tex, const char *fname);

#endif  /* OPENGL_H_ */