Initial screen layout implementation

include/renderer_mtl/renderer_mtl.hpp

@@ -89,7 +89,7 @@ class RendererMTL final : public Renderer {
 	MTL::Texture* lastDepthTexture = nullptr;
 
 	// Information about the final 3DS screen -> Window blit, accounting for things like scaling and shifting the output based on
-	// the window's dimensions.
+	// the window's dimensions. Updated whenever the screen size or layout changes.
 	struct {
 		float topScreenX = 0;
 		float topScreenY = 0;