Starting metal backend

src/Engine/Graphics/Metal/Enums.h

@@ -0,0 +1,15 @@
+#pragma once
+#include "Graphics/Enums.h"
+#include "Metal/MTLPixelFormat.hpp"
+#include "Metal/MTLTexture.hpp"
+
+namespace Seele
+{
+namespace Metal
+{
+MTL::PixelFormat cast(Gfx::SeFormat format);
+Gfx::SeFormat cast(MTL::PixelFormat format);
+MTL::TextureUsage cast(Gfx::SeImageUsageFlags usage);
+Gfx::SeImageUsageFlags cast(MTL::TextureUsage usage);
+}
+}