Merge Image and Canvas GL backend classes into new common Texture class.

src/modules/graphics/opengl/Texture.h

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+/**
+ * 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
+
+// LOVE
+#include "graphics/Texture.h"
+#include "graphics/Volatile.h"
+
+// OpenGL
+#include "OpenGL.h"
+
+namespace love
+{
+namespace graphics
+{
+namespace opengl
+{
+
+class Texture final : public love::graphics::Texture, public Volatile
+{
+public:
+
+	Texture(const Settings &settings, const Slices *data);
+
+	virtual ~Texture();
+
+	// Implements Volatile.
+	bool loadVolatile() override;
+	void unloadVolatile() override;
+
+	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;
+	ptrdiff_t getRenderTargetHandle() const override;
+	int getMSAA() const override { return actualSamples; }
+
+	inline GLuint getFBO() const { return fbo; }
+
+private:
+
+	bool createTexture();
+	bool createRenderbuffer();
+
+	void uploadByteData(PixelFormat pixelformat, const void *data, size_t size, int level, int slice, const Rect &r, love::image::ImageDataBase *imgd = nullptr) override;
+
+	Slices slices;
+
+	GLuint fbo;
+
+	GLuint texture;
+	GLuint renderbuffer;
+
+	GLenum framebufferStatus;
+
+	int actualSamples;
+
+}; // Texture
+
+} // opengl
+} // graphics
+} // love