private static void InitializeDSA() { if (IsVersionAtLeast(4, 5)) { IsARBDirectStateAccessAvailable = true; dsaimpl = new DirectStateAccessARBImpl(); return; } if (IsExtensionSupported("GL_EXT_direct_state_access")) { IsEXTDirectStateAccessAvailable = true; dsaimpl = new DirectStateAccessEXTImpl(); return; } dsaimpl = new DirectStateAccessNullImpl(); }