Update metal backend for Image+Canvas->Texture changes

src/modules/graphics/metal/Texture.h

@@ -0,0 +1,62 @@
+/**
+ * Copyright (c) 2006-2020 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#pragma once
+
+#include "common/config.h"
+#include "common/Color.h"
+#include "common/int.h"
+#include "graphics/Texture.h"
+#include "Metal.h"
+
+namespace love
+{
+namespace graphics
+{
+namespace metal
+{
+
+class Texture final : public love::graphics::Texture
+{
+public:
+
+	Texture(id<MTLDevice> device, const Settings &settings, const Slices *data);
+	virtual ~Texture();
+
+	void generateMipmaps() override;
+	love::image::ImageData *newImageData(love::image::Image *module, int slice, int mipmap, const Rect &rect) override;
+	void setSamplerState(const SamplerState &s) override;
+
+	ptrdiff_t getHandle() const override { return (ptrdiff_t) texture; }
+	ptrdiff_t getRenderTargetHandle() const override { return (ptrdiff_t) texture; /* TODO */ }
+	int getMSAA() const override { return 1 /* TODO*/; }
+
+private:
+
+	void uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd = nullptr) override;
+
+	id<MTLTexture> texture;
+	id<MTLSamplerState> sampler;
+
+}; // Texture
+
+} // metal
+} // graphics
+} // love