implement right-to-left

engine/app.cpp

@@ -348,7 +348,9 @@ void App::update(float dt)
             glm::ivec4 c = glm::vec4((int)box.x, (int)(height / zoom - box.y - box.w), (int)box.z, (int)box.w) * zoom;
             glScissor(c.x, c.y, c.z, c.w);
             n->draw();
+            return true;
         }
+        return false;
     };
     //glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 #if __IOS__