if(s.required_features.arb_uniform_buffer_object)
append("#extension GL_ARB_uniform_buffer_object: require\n");
if(s.required_features.ext_gpu_shader4)
if(s.required_features.arb_uniform_buffer_object)
append("#extension GL_ARB_uniform_buffer_object: require\n");
if(s.required_features.ext_gpu_shader4)