GPU: Preliminary work for texture decoding.

src/video_core/textures/decoders.cpp

@@ -0,0 +1,14 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "video_core/textures/decoders.h"
+
+namespace Tegra {
+namespace Texture {
+
+std::vector<u8> DecodeTexture(VAddr address, TextureFormat format, u32 width, u32 height) {
+    return {};
+}
+}
+} // namespace Tegra