textures: add BC1 and BC3 compressors and recompression setting

src/video_core/textures/bcn.h

@@ -0,0 +1,17 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <span>
+#include <stdint.h>
+
+namespace Tegra::Texture::BCN {
+
+void CompressBC1(std::span<const uint8_t> data, uint32_t width, uint32_t height, uint32_t depth,
+                 std::span<uint8_t> output);
+
+void CompressBC3(std::span<const uint8_t> data, uint32_t width, uint32_t height, uint32_t depth,
+                 std::span<uint8_t> output);
+
+} // namespace Tegra::Texture::BCN