D3D12: Initial commit for D3D12 backend implementation.

Source/Core/VideoBackends/D3D12/PSTextureEncoder.h

@@ -0,0 +1,53 @@
+// Copyright 2011 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "VideoBackends/D3D12/TextureEncoder.h"
+
+#include "VideoCommon/TextureCacheBase.h"
+
+namespace DX12
+{
+
+class PSTextureEncoder final : public TextureEncoder
+{
+public:
+	PSTextureEncoder();
+
+	void Init();
+	void Shutdown();
+	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);
+
+private:
+	bool m_ready = false;
+
+	ID3D12Resource* m_out = nullptr;
+	D3D12_CPU_DESCRIPTOR_HANDLE m_out_rtv_cpu = {};
+
+	ID3D12Resource* m_out_readback_buffer = nullptr;
+	void* m_out_readback_buffer_data = nullptr;
+
+	ID3D12Resource* m_encode_params_buffer = nullptr;
+	void* m_encode_params_buffer_data = nullptr;
+
+	D3D12_SHADER_BYTECODE SetStaticShader(unsigned int dst_format,
+		PEControl::PixelFormat src_format, bool is_intensity, bool scale_by_half);
+
+	using ComboKey = unsigned int; // Key for a shader combination
+	static ComboKey MakeComboKey(unsigned int dst_format,
+		PEControl::PixelFormat src_format, bool is_intensity, bool scale_by_half)
+	{
+		return (dst_format << 4) | (static_cast<int>(src_format) << 2) | (is_intensity ? (1 << 1) : 0)
+			| (scale_by_half ? (1 << 0) : 0);
+	}
+
+	using ComboMap = std::map<ComboKey, D3D12_SHADER_BYTECODE>;
+	ComboMap m_static_shaders_map;
+	std::vector<ID3DBlob*> m_static_shaders_blobs;
+};
+
+}