GL_MESA_map_buffer_client_pointer
https://www.khronos.org/registry/OpenGL/extensions/MESA/MESA_map_buffer_client_pointer.txt
GL_MESA_map_buffer_client_pointer

	GL_MAP_CLIENT_POINTER_BIT_MESA 0x4000
	GL_BUFFER_CLIENT_POINTER_SIZE_MESA 0x9790
	void glAddClientPointerRangeMESA (void* addr, GLsizeiptr size)
	void * glReleaseClientPointerRangeMESA (GLsizeiptr *size)
