Sampler.h

// Copyright (c) 2017- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#pragma once

#include "ppsspp_config.h"

#include <unordered_map>
#include <unordered_set>
#include "Common/Data/Collections/Hashmaps.h"
#include "GPU/Math3D.h"
#include "GPU/Software/FuncId.h"
#include "GPU/Software/RasterizerRegCache.h"

class BinManager;

namespace Sampler {

// Our std::unordered_map argument will ignore the alignment attribute, but that doesn't matter.
// We'll still have and want it for the actual function call, to keep the args in vector registers.
#if defined(__clang__) || defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wignored-attributes"
#endif

typedef Rasterizer::Vec4IntResult(SOFTRAST_CALL *FetchFunc)(int u, int v, const u8 *tptr, int bufw, int level, const SamplerID &samplerID);
FetchFunc GetFetchFunc(SamplerID id, BinManager *binner);

typedef Rasterizer::Vec4IntResult (SOFTRAST_CALL *NearestFunc)(float s, float t, Rasterizer::Vec4IntArg prim_color, const u8 *const *tptr, const uint16_t *bufw, int level, int levelFrac, const SamplerID &samplerID);
NearestFunc GetNearestFunc(SamplerID id, BinManager *binner);

typedef Rasterizer::Vec4IntResult (SOFTRAST_CALL *LinearFunc)(float s, float t, Rasterizer::Vec4IntArg prim_color, const u8 *const *tptr, const uint16_t *bufw, int level, int levelFrac, const SamplerID &samplerID);
LinearFunc GetLinearFunc(SamplerID id, BinManager *binner);

void Init();
void FlushJit();
void Shutdown();

bool DescribeCodePtr(const u8 *ptr, std::string &name);

class SamplerJitCache : public Rasterizer::CodeBlock {
public:
	SamplerJitCache();

	// Returns a pointer to the code to run.
	NearestFunc GetNearest(const SamplerID &id, BinManager *binner);
	LinearFunc GetLinear(const SamplerID &id, BinManager *binner);
	FetchFunc GetFetch(const SamplerID &id, BinManager *binner);
	void Clear() override;
	void Flush();

	std::string DescribeCodePtr(const u8 *ptr) override;

private:
	void Compile(const SamplerID &id);
	NearestFunc GetByID(const SamplerID &id, size_t key, BinManager *binner);
	FetchFunc CompileFetch(const SamplerID &id);
	NearestFunc CompileNearest(const SamplerID &id);
	LinearFunc CompileLinear(const SamplerID &id);

	Rasterizer::RegCache::Reg GetSamplerID();
	void UnlockSamplerID(Rasterizer::RegCache::Reg &r);

	void WriteConstantPool(const SamplerID &id);

	bool Jit_ReadTextureFormat(const SamplerID &id);
	bool Jit_GetTexData(const SamplerID &id, int bitsPerTexel);
	bool Jit_GetTexDataSwizzled(const SamplerID &id, int bitsPerTexel);
	bool Jit_GetTexDataSwizzled4(const SamplerID &id);
	bool Jit_Decode5650(const SamplerID &id);
	bool Jit_Decode5551(const SamplerID &id);
	bool Jit_Decode4444(const SamplerID &id);
	bool Jit_TransformClutIndex(const SamplerID &id, int bitsPerIndex);
	bool Jit_ReadClutColor(const SamplerID &id);
	bool Jit_GetDXT1Color(const SamplerID &id, int blockSize, int alpha);
	bool Jit_ApplyDXTAlpha(const SamplerID &id);
	bool Jit_GetTexelCoords(const SamplerID &id);

	bool Jit_GetTexelCoordsQuad(const SamplerID &id);
	bool Jit_PrepareDataOffsets(const SamplerID &id, Rasterizer::RegCache::Reg uReg, Rasterizer::RegCache::Reg vReg, bool level1);
	bool Jit_PrepareDataDirectOffsets(const SamplerID &id, Rasterizer::RegCache::Reg uReg, Rasterizer::RegCache::Reg vReg, bool level1, int bitsPerTexel);
	bool Jit_PrepareDataSwizzledOffsets(const SamplerID &id, Rasterizer::RegCache::Reg uReg, Rasterizer::RegCache::Reg vReg, bool level1, int bitsPerTexel);
	bool Jit_PrepareDataDXTOffsets(const SamplerID &id, Rasterizer::RegCache::Reg uReg, Rasterizer::RegCache::Reg vReg, bool level1, int blockSize);
	bool Jit_FetchQuad(const SamplerID &id, bool level1);
	bool Jit_GetDataQuad(const SamplerID &id, bool level1, int bitsPerTexel);
	bool Jit_TransformClutIndexQuad(const SamplerID &id, int bitsPerIndex);
	bool Jit_ReadClutQuad(const SamplerID &id, bool level1);
	bool Jit_BlendQuad(const SamplerID &id, bool level1);
	bool Jit_DecodeQuad(const SamplerID &id, bool level1);
	bool Jit_Decode5650Quad(const SamplerID &id, Rasterizer::RegCache::Reg quadReg);
	bool Jit_Decode5551Quad(const SamplerID &id, Rasterizer::RegCache::Reg quadReg);
	bool Jit_Decode4444Quad(const SamplerID &id, Rasterizer::RegCache::Reg quadReg);

	bool Jit_ApplyTextureFunc(const SamplerID &id);

#if PPSSPP_ARCH(AMD64) || PPSSPP_ARCH(X86)
	int stackArgPos_ = 0;
	int stackIDOffset_ = -1;
	int stackLevelOffset_ = -1;
	int stackUV1Offset_ = 0;
#endif

	const u8 *constWidthHeight256f_ = nullptr;
	const u8 *constWidthMinus1i_ = nullptr;
	const u8 *constHeightMinus1i_ = nullptr;
	const u8 *constUNext_ = nullptr;
	const u8 *constVNext_ = nullptr;
	const u8 *constOnes32_ = nullptr;
	const u8 *constOnes16_ = nullptr;
	const u8 *constMaxTexel32_ = nullptr;
	const u8 *const10All16_ = nullptr;
	const u8 *const10Low_ = nullptr;
	const u8 *const10All8_ = nullptr;
	const u8 *const5551Swizzle_ = nullptr;
	const u8 *const5650Swizzle_ = nullptr;

	struct LastCache {
		size_t key;
		NearestFunc func;
		int gen = -1;

		bool Match(size_t k, int g) const {
			return key == k && gen == g;
		}

		void Set(size_t k, NearestFunc f, int g) {
			key = k;
			func = f;
			gen = g;
		}
	};

	DenseHashMap<size_t, NearestFunc> cache_;
	std::unordered_map<SamplerID, const u8 *> addresses_;
	std::unordered_set<SamplerID> compileQueue_;
	static int clearGen_;
	static thread_local LastCache lastFetch_;
	static thread_local LastCache lastNearest_;
	static thread_local LastCache lastLinear_;
};

#if defined(__clang__) || defined(__GNUC__)
#pragma GCC diagnostic pop
#endif

};