vulkan: implement graphics readback

src/modules/graphics/vulkan/GraphicsReadback.h

@@ -0,0 +1,31 @@
+#ifndef LOVE_GRAPHICS_VULKAN_GRAPHICS_READBACK_H
+#define LOVE_GRAPHICS_VULKAN_GRAPHICS_READBACK_H
+
+#include "graphics/GraphicsReadback.h"
+
+namespace love {
+namespace graphics {
+namespace vulkan {
+
+class Graphics;
+
+class GraphicsReadback : public graphics::GraphicsReadback {
+public:
+	GraphicsReadback(love::graphics::Graphics* gfx, ReadbackMethod method, love::graphics::Buffer* buffer, size_t offset, size_t size, data::ByteData* dest, size_t destoffset);
+	GraphicsReadback(love::graphics::Graphics* gfx, ReadbackMethod method, love::graphics::Texture* texture, int slice, int mipmap, const Rect& rect, image::ImageData* dest, int destx, int desty);
+	virtual ~GraphicsReadback();
+
+	void wait() override;
+	void update() override;
+
+private:
+
+	Graphics* vgfx;
+	StrongRef<love::graphics::Buffer> stagingBuffer;
+};
+
+} // vulkan
+} // graphics
+} // love
+
+#endif