type materialvertexshaderprogram [display="Material Vertex Shader Program"]
{
  i32 vertex_shader_ptr [ui, readonly, display="Vertex Shader Ptr"];

  // If vertex shader ptr is 0, parse load def
  if (vertex_shader_ptr == 0) {
    load_def = parse_here("gfxvertexshaderloaddef") [ui];
  }
}