dolphin/Source/Core/VideoBackends/D3D/StateCache.h

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#pragma once

#include <unordered_map>

#include "Common/BitField.h"
#include "Common/CommonTypes.h"
#include "VideoBackends/D3D/D3DBase.h"
#include "VideoCommon/BPMemory.h"

namespace DX11
{

union RasterizerState
{
	BitField<0, 2, D3D11_CULL_MODE> cull_mode;
	BitField<2, 1, u32> wireframe;

	u32 packed;
};

union BlendState
{
	BitField<0, 1, u32> blend_enable;
	BitField<1, 3, D3D11_BLEND_OP> blend_op;
	BitField<4, 4, u32> write_mask;
	BitField<8, 5, D3D11_BLEND> src_blend;
	BitField<13, 5, D3D11_BLEND> dst_blend;
	BitField<18, 1, u32> use_dst_alpha;

	u32 packed;
};

union SamplerState
{
	BitField<0, 3, u64> min_filter;
	BitField<3, 1, u64> mag_filter;
	BitField<4, 8, u64> min_lod;
	BitField<12, 8, u64> max_lod;
	BitField<20, 8, s64> lod_bias;
	BitField<28, 2, u64> wrap_s;
	BitField<30, 2, u64> wrap_t;
	BitField<32, 5, u64> max_anisotropy;

	u64 packed;
};

class StateCache
{
public:

	// Get existing or create new render state.
	// Returned objects is owned by the cache and does not need to be released.
	ID3D11SamplerState* Get(SamplerState state);
	ID3D11BlendState* Get(BlendState state);
	ID3D11RasterizerState* Get(RasterizerState state);
	ID3D11DepthStencilState* Get(ZMode state);

	// Release all cached states and clear hash tables.
	void Clear();

private:

	std::unordered_map<u32, ID3D11DepthStencilState*> m_depth;
	std::unordered_map<u32, ID3D11RasterizerState*> m_raster;
	std::unordered_map<u32, ID3D11BlendState*> m_blend;
	std::unordered_map<u64, ID3D11SamplerState*> m_sampler;

};

}