ios: Simplify MTKView interface (still doesn't work though)

include/renderer.hpp

@@ -87,8 +87,8 @@ class Renderer {
 	virtual void setupGLES() {}
 
 	// Only relevant for Metal renderer on iOS
-	// Passes a SwiftUI MTKView Drawable to the renderer
-	virtual void setMTKDrawable(void* drawable) {};
+	// Passes a SwiftUI MTKView's layer (CAMetalLayer) to the renderer
+	virtual void setMTKLayer(void* layer) {};
 
 	// This function is called on every draw call before parsing vertex data.
 	// It is responsible for things like looking up which vertex/fragment shaders to use, recompiling them if they don't exist, choosing between

include/renderer_mtl/renderer_mtl.hpp

@@ -42,11 +42,10 @@ class RendererMTL final : public Renderer {
 	virtual void initGraphicsContext([[maybe_unused]] GL::Context* context) override {}
 #endif
 
-	virtual void setMTKDrawable(void* drawable) override;
+	virtual void setMTKLayer(void* layer) override;
 
   private:
 	CA::MetalLayer* metalLayer = nullptr;
-	CA::MetalDrawable* metalDrawable = nullptr;
 
 	MTL::Device* device = nullptr;
 	MTL::CommandQueue* commandQueue = nullptr;