Update render to texture support for DX9

panda/src/dxgsg9/wdxGraphicsPipe9.cxx

@@ -107,7 +107,12 @@ PT(GraphicsBuffer) wdxGraphicsPipe9::
 make_buffer(GraphicsStateGuardian *gsg, const string &name,
             int x_size, int y_size) {
 
-  return new wdxGraphicsBuffer9(this, gsg, name, x_size, y_size);
+  if (support_render_texture && gsg->get_supports_render_texture ( )) {
+    return new wdxGraphicsBuffer9(this, gsg, name, x_size, y_size);
+  }
+  else {
+    return NULL;
+  }
 }
 
 ////////////////////////////////////////////////////////////////////