review vr stuff, fix controller-ui ray casting

src/canvas.h

@@ -10,11 +10,16 @@
 
 #define CANVAS_RES 1536
 
+class LayerFrame
+{
+
+};
+
 class Layer
 {
 public:
-    //Layer() = default;
-    //Layer(const Layer&) = delete;
+    Layer() = default;
+    Layer(const Layer&) = delete;
     RTT m_rtt[6];
     glm::vec4 m_dirty_box[6] = SIXPLETTE(glm::vec4(0));
     bool m_dirty_face[6] = SIXPLETTE(false);