D3D12: Initial commit for D3D12 backend implementation.

Source/Core/VideoBackends/D3D12/TextureEncoder.h

@@ -0,0 +1,32 @@
+// Copyright 2011 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoCommon/BPMemory.h"
+#include "VideoCommon/TextureCacheBase.h"
+#include "VideoCommon/VideoCommon.h"
+
+namespace DX12
+{
+// Maximum number of bytes that can occur in a texture block-row generated by
+// the encoder
+static constexpr unsigned int MAX_BYTES_PER_BLOCK_ROW = (EFB_WIDTH / 4) * 64;
+// The maximum amount of data that the texture encoder can generate in one call
+static constexpr unsigned int MAX_BYTES_PER_ENCODE = MAX_BYTES_PER_BLOCK_ROW * (EFB_HEIGHT / 4);
+
+class TextureEncoder
+{
+public:
+	virtual ~TextureEncoder() { }
+
+	virtual void Init() = 0;
+	virtual void Shutdown() = 0;
+	// Returns size in bytes of encoded block of memory
+	virtual void Encode(u8* dst, u32 format, u32 native_width, u32 bytes_per_row, u32 num_blocks_y, u32 memory_stride,
+		PEControl::PixelFormat src_format, const EFBRectangle& src_rect,
+		bool is_intensity, bool scale_by_half) = 0;
+};
+
+}