GPU: Preliminary work for texture decoding.

src/video_core/textures/decoders.h

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+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <vector>
+#include "common/common_types.h"
+#include "video_core/textures/texture.h"
+
+namespace Tegra {
+namespace Texture {
+
+/**
+ * Decodes a swizzled texture into a RGBA8888 texture.
+ */
+std::vector<u8> DecodeTexture(VAddr address, TextureFormat format, u32 width, u32 height);
+
+} // namespace Texture
+} // namespace Tegra