// Copyright 2010 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <string>

#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/LinearDiskCache.h"
#include "Common/StringUtil.h"

#include "Core/ConfigManager.h"

#include "VideoBackends/D3D/D3DBase.h"
#include "VideoBackends/D3D/D3DShader.h"
#include "VideoBackends/D3D/PixelShaderCache.h"

#include "VideoCommon/Debugger.h"
#include "VideoCommon/PixelShaderGen.h"
#include "VideoCommon/PixelShaderManager.h"
#include "VideoCommon/Statistics.h"
#include "VideoCommon/VideoConfig.h"

namespace DX11
{

PixelShaderCache::PSCache PixelShaderCache::PixelShaders;
const PixelShaderCache::PSCacheEntry* PixelShaderCache::last_entry;
PixelShaderUid PixelShaderCache::last_uid;
UidChecker<PixelShaderUid, ShaderCode> PixelShaderCache::pixel_uid_checker;

LinearDiskCache<PixelShaderUid, u8> g_ps_disk_cache;

ID3D11PixelShader* s_ColorMatrixProgram[2] = {nullptr};
ID3D11PixelShader* s_ColorCopyProgram[2] = {nullptr};
ID3D11PixelShader* s_DepthMatrixProgram[2] = {nullptr};
ID3D11PixelShader* s_ClearProgram = nullptr;
ID3D11PixelShader* s_AnaglyphProgram = nullptr;
ID3D11PixelShader* s_DepthResolveProgram = nullptr;
ID3D11PixelShader* s_rgba6_to_rgb8[2] = {nullptr};
ID3D11PixelShader* s_rgb8_to_rgba6[2] = {nullptr};
ID3D11Buffer* pscbuf = nullptr;

const char clear_program_code[] = {
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float4 incol0 : COLOR0){\n"
	"ocol0 = incol0;\n"
	"}\n"
};

// TODO: Find some way to avoid having separate shaders for non-MSAA and MSAA...
const char color_copy_program_code[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float3 uv0 : TEXCOORD0){\n"
	"ocol0 = Tex0.Sample(samp0,uv0);\n"
	"}\n"
};

// Anaglyph Red-Cyan shader based on Dubois algorithm
// Constants taken from the paper:
// "Conversion of a Stereo Pair to Anaglyph with
// the Least-Squares Projection Method"
// Eric Dubois, March 2009
const char anaglyph_program_code[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float3 uv0 : TEXCOORD0){\n"
	"float4 c0 = Tex0.Sample(samp0, float3(uv0.xy, 0.0));\n"
	"float4 c1 = Tex0.Sample(samp0, float3(uv0.xy, 1.0));\n"
	"float3x3 l = float3x3( 0.437, 0.449, 0.164,\n"
	"                      -0.062,-0.062,-0.024,\n"
	"                      -0.048,-0.050,-0.017);\n"
	"float3x3 r = float3x3(-0.011,-0.032,-0.007,\n"
	"                       0.377, 0.761, 0.009,\n"
	"                      -0.026,-0.093, 1.234);\n"
	"ocol0 = float4(mul(l, c0.rgb) + mul(r, c1.rgb), c0.a);\n"
	"}\n"
};

// TODO: Improve sampling algorithm!
const char color_copy_program_code_msaa[] = {
	"#define SAMPLES %d\n"
	"sampler samp0 : register(s0);\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float3 uv0 : TEXCOORD0){\n"
	"int width, height, slices, samples;\n"
	"Tex0.GetDimensions(width, height, slices, samples);\n"
	"ocol0 = 0;\n"
	"for(int i = 0; i < SAMPLES; ++i)\n"
	"	ocol0 += Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i);\n"
	"ocol0 /= SAMPLES;\n"
	"}\n"
};

const char color_matrix_program_code[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"uniform float4 cColMatrix[7] : register(c0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float3 uv0 : TEXCOORD0){\n"
	"float4 texcol = Tex0.Sample(samp0,uv0);\n"
	"texcol = round(texcol * cColMatrix[5])*cColMatrix[6];\n"
	"ocol0 = float4(dot(texcol,cColMatrix[0]),dot(texcol,cColMatrix[1]),dot(texcol,cColMatrix[2]),dot(texcol,cColMatrix[3])) + cColMatrix[4];\n"
	"}\n"
};

const char color_matrix_program_code_msaa[] = {
	"#define SAMPLES %d\n"
	"sampler samp0 : register(s0);\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"uniform float4 cColMatrix[7] : register(c0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	"in float4 pos : SV_Position,\n"
	"in float3 uv0 : TEXCOORD0){\n"
	"int width, height, slices, samples;\n"
	"Tex0.GetDimensions(width, height, slices, samples);\n"
	"float4 texcol = 0;\n"
	"for(int i = 0; i < SAMPLES; ++i)\n"
	"	texcol += Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i);\n"
	"texcol /= SAMPLES;\n"
	"texcol = round(texcol * cColMatrix[5])*cColMatrix[6];\n"
	"ocol0 = float4(dot(texcol,cColMatrix[0]),dot(texcol,cColMatrix[1]),dot(texcol,cColMatrix[2]),dot(texcol,cColMatrix[3])) + cColMatrix[4];\n"
	"}\n"
};

const char depth_matrix_program[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"uniform float4 cColMatrix[7] : register(c0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	" in float4 pos : SV_Position,\n"
	" in float3 uv0 : TEXCOORD0){\n"
	"	float4 texcol = Tex0.Sample(samp0,uv0);\n"
	"	int depth = int((1.0 - texcol.x) * 16777216.0);\n"

	// Convert to Z24 format
	"	int4 workspace;\n"
	"	workspace.r = (depth >> 16) & 255;\n"
	"	workspace.g = (depth >> 8) & 255;\n"
	"	workspace.b = depth & 255;\n"

	// Convert to Z4 format
	"	workspace.a = (depth >> 16) & 0xF0;\n"

	// Normalize components to [0.0..1.0]
	"	texcol = float4(workspace) / 255.0;\n"

	// Apply color matrix
	"	ocol0 = float4(dot(texcol,cColMatrix[0]),dot(texcol,cColMatrix[1]),dot(texcol,cColMatrix[2]),dot(texcol,cColMatrix[3])) + cColMatrix[4];\n"
	"}\n"
};

const char depth_matrix_program_msaa[] = {
	"#define SAMPLES %d\n"
	"sampler samp0 : register(s0);\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"uniform float4 cColMatrix[7] : register(c0);\n"
	"void main(\n"
	"out float4 ocol0 : SV_Target,\n"
	" in float4 pos : SV_Position,\n"
	" in float3 uv0 : TEXCOORD0){\n"
	"	int width, height, slices, samples;\n"
	"	Tex0.GetDimensions(width, height, slices, samples);\n"
	"	float4 texcol = 0;\n"
	"	for(int i = 0; i < SAMPLES; ++i)\n"
	"		texcol += Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i);\n"
	"	texcol /= SAMPLES;\n"
	"	int depth = int((1.0 - texcol.x) * 16777216.0);\n"

	// Convert to Z24 format
	"	int4 workspace;\n"
	"	workspace.r = (depth >> 16) & 255;\n"
	"	workspace.g = (depth >> 8) & 255;\n"
	"	workspace.b = depth & 255;\n"

	// Convert to Z4 format
	"	workspace.a = (depth >> 16) & 0xF0;\n"

	// Normalize components to [0.0..1.0]
	"	texcol = float4(workspace) / 255.0;\n"

	// Apply color matrix
	"	ocol0 = float4(dot(texcol,cColMatrix[0]),dot(texcol,cColMatrix[1]),dot(texcol,cColMatrix[2]),dot(texcol,cColMatrix[3])) + cColMatrix[4];\n"
	"}\n"
};

const char depth_resolve_program[] = {
	"#define SAMPLES %d\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"void main(\n"
	"	 out float ocol0 : SV_Target,\n"
	"    in float4 pos : SV_Position,\n"
	"    in float3 uv0 : TEXCOORD0)\n"
	"{\n"
	"	int width, height, slices, samples;\n"
	"	Tex0.GetDimensions(width, height, slices, samples);\n"
	"	ocol0 = Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), 0).x;\n"
	"	for(int i = 1; i < SAMPLES; ++i)\n"
	"		ocol0 = min(ocol0, Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i).x);\n"
	"}\n"
};

const char reint_rgba6_to_rgb8[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"void main(\n"
	"	out float4 ocol0 : SV_Target,\n"
	"	in float4 pos : SV_Position,\n"
	"	in float3 uv0 : TEXCOORD0)\n"
	"{\n"
	"	int4 src6 = round(Tex0.Sample(samp0,uv0) * 63.f);\n"
	"	int4 dst8;\n"
	"	dst8.r = (src6.r << 2) | (src6.g >> 4);\n"
	"	dst8.g = ((src6.g & 0xF) << 4) | (src6.b >> 2);\n"
	"	dst8.b = ((src6.b & 0x3) << 6) | src6.a;\n"
	"	dst8.a = 255;\n"
	"	ocol0 = (float4)dst8 / 255.f;\n"
	"}"
};

const char reint_rgba6_to_rgb8_msaa[] = {
	"#define SAMPLES %d\n"
	"sampler samp0 : register(s0);\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"void main(\n"
	"	out float4 ocol0 : SV_Target,\n"
	"	in float4 pos : SV_Position,\n"
	"	in float3 uv0 : TEXCOORD0)\n"
	"{\n"
	"	int width, height, slices, samples;\n"
	"	Tex0.GetDimensions(width, height, slices, samples);\n"
	"	float4 texcol = 0;\n"
	"	for (int i = 0; i < SAMPLES; ++i)\n"
	"		texcol += Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i);\n"
	"	texcol /= SAMPLES;\n"
	"	int4 src6 = round(texcol * 63.f);\n"
	"	int4 dst8;\n"
	"	dst8.r = (src6.r << 2) | (src6.g >> 4);\n"
	"	dst8.g = ((src6.g & 0xF) << 4) | (src6.b >> 2);\n"
	"	dst8.b = ((src6.b & 0x3) << 6) | src6.a;\n"
	"	dst8.a = 255;\n"
	"	ocol0 = (float4)dst8 / 255.f;\n"
	"}"
};

const char reint_rgb8_to_rgba6[] = {
	"sampler samp0 : register(s0);\n"
	"Texture2DArray Tex0 : register(t0);\n"
	"void main(\n"
	"	out float4 ocol0 : SV_Target,\n"
	"	in float4 pos : SV_Position,\n"
	"	in float3 uv0 : TEXCOORD0)\n"
	"{\n"
	"	int4 src8 = round(Tex0.Sample(samp0,uv0) * 255.f);\n"
	"	int4 dst6;\n"
	"	dst6.r = src8.r >> 2;\n"
	"	dst6.g = ((src8.r & 0x3) << 4) | (src8.g >> 4);\n"
	"	dst6.b = ((src8.g & 0xF) << 2) | (src8.b >> 6);\n"
	"	dst6.a = src8.b & 0x3F;\n"
	"	ocol0 = (float4)dst6 / 63.f;\n"
	"}\n"
};

const char reint_rgb8_to_rgba6_msaa[] = {
	"#define SAMPLES %d\n"
	"sampler samp0 : register(s0);\n"
	"Texture2DMSArray<float4, SAMPLES> Tex0 : register(t0);\n"
	"void main(\n"
	"	out float4 ocol0 : SV_Target,\n"
	"	in float4 pos : SV_Position,\n"
	"	in float3 uv0 : TEXCOORD0)\n"
	"{\n"
	"	int width, height, slices, samples;\n"
	"	Tex0.GetDimensions(width, height, slices, samples);\n"
	"	float4 texcol = 0;\n"
	"	for (int i = 0; i < SAMPLES; ++i)\n"
	"		texcol += Tex0.Load(int3(uv0.x*(width), uv0.y*(height), uv0.z), i);\n"
	"	texcol /= SAMPLES;\n"
	"	int4 src8 = round(texcol * 255.f);\n"
	"	int4 dst6;\n"
	"	dst6.r = src8.r >> 2;\n"
	"	dst6.g = ((src8.r & 0x3) << 4) | (src8.g >> 4);\n"
	"	dst6.b = ((src8.g & 0xF) << 2) | (src8.b >> 6);\n"
	"	dst6.a = src8.b & 0x3F;\n"
	"	ocol0 = (float4)dst6 / 63.f;\n"
	"}\n"
};

ID3D11PixelShader* PixelShaderCache::ReinterpRGBA6ToRGB8(bool multisampled)
{
	if (!multisampled || g_ActiveConfig.iMultisamples <= 1)
	{
		if (!s_rgba6_to_rgb8[0])
		{
			s_rgba6_to_rgb8[0] = D3D::CompileAndCreatePixelShader(reint_rgba6_to_rgb8);
			CHECK(s_rgba6_to_rgb8[0], "Create RGBA6 to RGB8 pixel shader");
			D3D::SetDebugObjectName(s_rgba6_to_rgb8[0], "RGBA6 to RGB8 pixel shader");
		}
		return s_rgba6_to_rgb8[0];
	}
	else if (!s_rgba6_to_rgb8[1])
	{
		// create MSAA shader for current AA mode
		std::string buf = StringFromFormat(reint_rgba6_to_rgb8_msaa, g_ActiveConfig.iMultisamples);
		s_rgba6_to_rgb8[1] = D3D::CompileAndCreatePixelShader(buf);

		CHECK(s_rgba6_to_rgb8[1], "Create RGBA6 to RGB8 MSAA pixel shader");
		D3D::SetDebugObjectName(s_rgba6_to_rgb8[1], "RGBA6 to RGB8 MSAA pixel shader");
	}
	return s_rgba6_to_rgb8[1];
}

ID3D11PixelShader* PixelShaderCache::ReinterpRGB8ToRGBA6(bool multisampled)
{
	if (!multisampled || g_ActiveConfig.iMultisamples <= 1)
	{
		if (!s_rgb8_to_rgba6[0])
		{
			s_rgb8_to_rgba6[0] = D3D::CompileAndCreatePixelShader(reint_rgb8_to_rgba6);
			CHECK(s_rgb8_to_rgba6[0], "Create RGB8 to RGBA6 pixel shader");
			D3D::SetDebugObjectName(s_rgb8_to_rgba6[0], "RGB8 to RGBA6 pixel shader");
		}
		return s_rgb8_to_rgba6[0];
	}
	else if (!s_rgb8_to_rgba6[1])
	{
		// create MSAA shader for current AA mode
		std::string buf = StringFromFormat(reint_rgb8_to_rgba6_msaa, g_ActiveConfig.iMultisamples);
		s_rgb8_to_rgba6[1] = D3D::CompileAndCreatePixelShader(buf);

		CHECK(s_rgb8_to_rgba6[1], "Create RGB8 to RGBA6 MSAA pixel shader");
		D3D::SetDebugObjectName(s_rgb8_to_rgba6[1], "RGB8 to RGBA6 MSAA pixel shader");
	}
	return s_rgb8_to_rgba6[1];
}

ID3D11PixelShader* PixelShaderCache::GetColorCopyProgram(bool multisampled)
{
	if (!multisampled || g_ActiveConfig.iMultisamples <= 1)
	{
		return s_ColorCopyProgram[0];
	}
	else if (s_ColorCopyProgram[1])
	{
		return s_ColorCopyProgram[1];
	}
	else
	{
		// create MSAA shader for current AA mode
		std::string buf = StringFromFormat(color_copy_program_code_msaa, g_ActiveConfig.iMultisamples);
		s_ColorCopyProgram[1] = D3D::CompileAndCreatePixelShader(buf);
		CHECK(s_ColorCopyProgram[1]!=nullptr, "Create color copy MSAA pixel shader");
		D3D::SetDebugObjectName((ID3D11DeviceChild*)s_ColorCopyProgram[1], "color copy MSAA pixel shader");
		return s_ColorCopyProgram[1];
	}
}

ID3D11PixelShader* PixelShaderCache::GetColorMatrixProgram(bool multisampled)
{
	if (!multisampled || g_ActiveConfig.iMultisamples <= 1)
	{
		return s_ColorMatrixProgram[0];
	}
	else if (s_ColorMatrixProgram[1])
	{
		return s_ColorMatrixProgram[1];
	}
	else
	{
		// create MSAA shader for current AA mode
		std::string buf = StringFromFormat(color_matrix_program_code_msaa, g_ActiveConfig.iMultisamples);
		s_ColorMatrixProgram[1] = D3D::CompileAndCreatePixelShader(buf);
		CHECK(s_ColorMatrixProgram[1]!=nullptr, "Create color matrix MSAA pixel shader");
		D3D::SetDebugObjectName((ID3D11DeviceChild*)s_ColorMatrixProgram[1], "color matrix MSAA pixel shader");
		return s_ColorMatrixProgram[1];
	}
}

ID3D11PixelShader* PixelShaderCache::GetDepthMatrixProgram(bool multisampled)
{
	if (!multisampled || g_ActiveConfig.iMultisamples <= 1)
	{
		return s_DepthMatrixProgram[0];
	}
	else if (s_DepthMatrixProgram[1])
	{
		return s_DepthMatrixProgram[1];
	}
	else
	{
		// create MSAA shader for current AA mode
		std::string buf = StringFromFormat(depth_matrix_program_msaa, g_ActiveConfig.iMultisamples);
		s_DepthMatrixProgram[1] = D3D::CompileAndCreatePixelShader(buf);
		CHECK(s_DepthMatrixProgram[1]!=nullptr, "Create depth matrix MSAA pixel shader");
		D3D::SetDebugObjectName((ID3D11DeviceChild*)s_DepthMatrixProgram[1], "depth matrix MSAA pixel shader");
		return s_DepthMatrixProgram[1];
	}
}

ID3D11PixelShader* PixelShaderCache::GetClearProgram()
{
	return s_ClearProgram;
}

ID3D11PixelShader* PixelShaderCache::GetAnaglyphProgram()
{
	return s_AnaglyphProgram;
}

ID3D11PixelShader* PixelShaderCache::GetDepthResolveProgram()
{
	if (s_DepthResolveProgram != nullptr)
		return s_DepthResolveProgram;

	// create MSAA shader for current AA mode
	std::string buf = StringFromFormat(depth_resolve_program, g_ActiveConfig.iMultisamples);
	s_DepthResolveProgram = D3D::CompileAndCreatePixelShader(buf);
	CHECK(s_DepthResolveProgram != nullptr, "Create depth matrix MSAA pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_DepthResolveProgram, "depth resolve pixel shader");
	return s_DepthResolveProgram;
}

ID3D11Buffer* &PixelShaderCache::GetConstantBuffer()
{
	// TODO: divide the global variables of the generated shaders into about 5 constant buffers to speed this up
	if (PixelShaderManager::dirty)
	{
		D3D11_MAPPED_SUBRESOURCE map;
		D3D::context->Map(pscbuf, 0, D3D11_MAP_WRITE_DISCARD, 0, &map);
		memcpy(map.pData, &PixelShaderManager::constants, sizeof(PixelShaderConstants));
		D3D::context->Unmap(pscbuf, 0);
		PixelShaderManager::dirty = false;

		ADDSTAT(stats.thisFrame.bytesUniformStreamed, sizeof(PixelShaderConstants));
	}
	return pscbuf;
}

// this class will load the precompiled shaders into our cache
class PixelShaderCacheInserter : public LinearDiskCacheReader<PixelShaderUid, u8>
{
public:
	void Read(const PixelShaderUid &key, const u8* value, u32 value_size)
	{
		PixelShaderCache::InsertByteCode(key, value, value_size);
	}
};

void PixelShaderCache::Init()
{
	unsigned int cbsize = ROUND_UP(sizeof(PixelShaderConstants), 16); // must be a multiple of 16
	D3D11_BUFFER_DESC cbdesc = CD3D11_BUFFER_DESC(cbsize, D3D11_BIND_CONSTANT_BUFFER, D3D11_USAGE_DYNAMIC, D3D11_CPU_ACCESS_WRITE);
	D3D::device->CreateBuffer(&cbdesc, nullptr, &pscbuf);
	CHECK(pscbuf!=nullptr, "Create pixel shader constant buffer");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)pscbuf, "pixel shader constant buffer used to emulate the GX pipeline");

	// used when drawing clear quads
	s_ClearProgram = D3D::CompileAndCreatePixelShader(clear_program_code);
	CHECK(s_ClearProgram!=nullptr, "Create clear pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_ClearProgram, "clear pixel shader");

	// used for anaglyph stereoscopy
	s_AnaglyphProgram = D3D::CompileAndCreatePixelShader(anaglyph_program_code);
	CHECK(s_AnaglyphProgram != nullptr, "Create anaglyph pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_AnaglyphProgram, "anaglyph pixel shader");

	// used when copying/resolving the color buffer
	s_ColorCopyProgram[0] = D3D::CompileAndCreatePixelShader(color_copy_program_code);
	CHECK(s_ColorCopyProgram[0]!=nullptr, "Create color copy pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_ColorCopyProgram[0], "color copy pixel shader");

	// used for color conversion
	s_ColorMatrixProgram[0] = D3D::CompileAndCreatePixelShader(color_matrix_program_code);
	CHECK(s_ColorMatrixProgram[0]!=nullptr, "Create color matrix pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_ColorMatrixProgram[0], "color matrix pixel shader");

	// used for depth copy
	s_DepthMatrixProgram[0] = D3D::CompileAndCreatePixelShader(depth_matrix_program);
	CHECK(s_DepthMatrixProgram[0]!=nullptr, "Create depth matrix pixel shader");
	D3D::SetDebugObjectName((ID3D11DeviceChild*)s_DepthMatrixProgram[0], "depth matrix pixel shader");

	Clear();

	if (!File::Exists(File::GetUserPath(D_SHADERCACHE_IDX)))
		File::CreateDir(File::GetUserPath(D_SHADERCACHE_IDX));

	SETSTAT(stats.numPixelShadersCreated, 0);
	SETSTAT(stats.numPixelShadersAlive, 0);

	std::string cache_filename = StringFromFormat("%sdx11-%s-ps.cache", File::GetUserPath(D_SHADERCACHE_IDX).c_str(),
			SConfig::GetInstance().m_strUniqueID.c_str());
	PixelShaderCacheInserter inserter;
	g_ps_disk_cache.OpenAndRead(cache_filename, inserter);

	if (g_Config.bEnableShaderDebugging)
		Clear();

	last_entry = nullptr;
}

// ONLY to be used during shutdown.
void PixelShaderCache::Clear()
{
	for (auto& iter : PixelShaders)
		iter.second.Destroy();
	PixelShaders.clear();
	pixel_uid_checker.Invalidate();

	last_entry = nullptr;
}

// Used in Swap() when AA mode has changed
void PixelShaderCache::InvalidateMSAAShaders()
{
	SAFE_RELEASE(s_ColorCopyProgram[1]);
	SAFE_RELEASE(s_ColorMatrixProgram[1]);
	SAFE_RELEASE(s_DepthMatrixProgram[1]);
	SAFE_RELEASE(s_rgb8_to_rgba6[1]);
	SAFE_RELEASE(s_rgba6_to_rgb8[1]);
	SAFE_RELEASE(s_DepthResolveProgram);
}

void PixelShaderCache::Shutdown()
{
	SAFE_RELEASE(pscbuf);

	SAFE_RELEASE(s_ClearProgram);
	SAFE_RELEASE(s_AnaglyphProgram);
	SAFE_RELEASE(s_DepthResolveProgram);
	for (int i = 0; i < 2; ++i)
	{
		SAFE_RELEASE(s_ColorCopyProgram[i]);
		SAFE_RELEASE(s_ColorMatrixProgram[i]);
		SAFE_RELEASE(s_DepthMatrixProgram[i]);
		SAFE_RELEASE(s_rgba6_to_rgb8[i]);
		SAFE_RELEASE(s_rgb8_to_rgba6[i]);
	}

	Clear();
	g_ps_disk_cache.Sync();
	g_ps_disk_cache.Close();
}

bool PixelShaderCache::SetShader(DSTALPHA_MODE dstAlphaMode)
{
	PixelShaderUid uid = GetPixelShaderUid(dstAlphaMode, API_D3D);
	if (g_ActiveConfig.bEnableShaderDebugging)
	{
		ShaderCode code = GeneratePixelShaderCode(dstAlphaMode, API_D3D);
		pixel_uid_checker.AddToIndexAndCheck(code, uid, "Pixel", "p");
	}

	// Check if the shader is already set
	if (last_entry)
	{
		if (uid == last_uid)
		{
			GFX_DEBUGGER_PAUSE_AT(NEXT_PIXEL_SHADER_CHANGE,true);
			return (last_entry->shader != nullptr);
		}
	}

	last_uid = uid;

	// Check if the shader is already in the cache
	PSCache::iterator iter;
	iter = PixelShaders.find(uid);
	if (iter != PixelShaders.end())
	{
		const PSCacheEntry &entry = iter->second;
		last_entry = &entry;

		GFX_DEBUGGER_PAUSE_AT(NEXT_PIXEL_SHADER_CHANGE,true);
		return (entry.shader != nullptr);
	}

	// Need to compile a new shader
	ShaderCode code = GeneratePixelShaderCode(dstAlphaMode, API_D3D);

	D3DBlob* pbytecode;
	if (!D3D::CompilePixelShader(code.GetBuffer(), &pbytecode))
	{
		GFX_DEBUGGER_PAUSE_AT(NEXT_ERROR, true);
		return false;
	}

	// Insert the bytecode into the caches
	g_ps_disk_cache.Append(uid, pbytecode->Data(), pbytecode->Size());

	bool success = InsertByteCode(uid, pbytecode->Data(), pbytecode->Size());
	pbytecode->Release();

	if (g_ActiveConfig.bEnableShaderDebugging && success)
	{
		PixelShaders[uid].code = code.GetBuffer();
	}

	GFX_DEBUGGER_PAUSE_AT(NEXT_PIXEL_SHADER_CHANGE, true);
	return success;
}

bool PixelShaderCache::InsertByteCode(const PixelShaderUid &uid, const void* bytecode, unsigned int bytecodelen)
{
	ID3D11PixelShader* shader = D3D::CreatePixelShaderFromByteCode(bytecode, bytecodelen);
	if (shader == nullptr)
		return false;

	// TODO: Somehow make the debug name a bit more specific
	D3D::SetDebugObjectName((ID3D11DeviceChild*)shader, "a pixel shader of PixelShaderCache");

	// Make an entry in the table
	PSCacheEntry newentry;
	newentry.shader = shader;
	PixelShaders[uid] = newentry;
	last_entry = &PixelShaders[uid];

	if (!shader)
	{
		// INCSTAT(stats.numPixelShadersFailed);
		return false;
	}

	INCSTAT(stats.numPixelShadersCreated);
	SETSTAT(stats.numPixelShadersAlive, PixelShaders.size());
	return true;
}

}  // DX11
