update xcode project, skip drawing invisible layers, this will optimize animations

engine/node_canvas.cpp

@@ -92,6 +92,8 @@ void NodeCanvas::draw()
         ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
         for (auto layer_index : m_canvas->m_order)
         {
+            if (m_canvas->m_layers[layer_index].m_opacity == .0f)
+                continue;
             int z = m_canvas->m_order.size() - layer_index;
             auto plane_mvp_z = proj * camera * glm::scale(glm::vec3(z)) * m_canvas->m_plane_transform[plane_index] * glm::translate(glm::vec3(0, 0, -1));
             ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);