Play-/Source/gs/GsPixelFormats.h

#pragma once

#include <algorithm>
#include "Types.h"
#include "GSHandler.h"

//defined in limits.h
#undef PAGESIZE

class CGsPixelFormats
{
public:
	//Various region sizes, in bytes
	enum PAGESIZE
	{
		PAGESIZE = 8192,
	};

	enum BLOCKSIZE
	{
		BLOCKSIZE = 256,
	};

	enum COLUMNSIZE
	{
		COLUMNSIZE = 64,
	};

	struct STORAGEPSMCT32
	{
		enum PAGEWIDTH
		{
			PAGEWIDTH = 64
		};
		enum PAGEHEIGHT
		{
			PAGEHEIGHT = 32
		};
		enum BLOCKWIDTH
		{
			BLOCKWIDTH = 8
		};
		enum BLOCKHEIGHT
		{
			BLOCKHEIGHT = 8
		};
		enum COLUMNWIDTH
		{
			COLUMNWIDTH = 8
		};
		enum COLUMNHEIGHT
		{
			COLUMNHEIGHT = 2
		};

		static const int m_nBlockSwizzleTable[4][8];
		static const int m_nColumnSwizzleTable[2][8];

		typedef uint32 Unit;
	};

	struct STORAGEPSMCT16
	{
		enum PAGEWIDTH
		{
			PAGEWIDTH = 64
		};
		enum PAGEHEIGHT
		{
			PAGEHEIGHT = 64
		};
		enum BLOCKWIDTH
		{
			BLOCKWIDTH = 16
		};
		enum BLOCKHEIGHT
		{
			BLOCKHEIGHT = 8
		};
		enum COLUMNWIDTH
		{
			COLUMNWIDTH = 16
		};
		enum COLUMNHEIGHT
		{
			COLUMNHEIGHT = 2
		};

		static const int m_nBlockSwizzleTable[8][4];
		static const int m_nColumnSwizzleTable[2][16];

		typedef uint16 Unit;
	};

	struct STORAGEPSMCT16S
	{
		enum PAGEWIDTH
		{
			PAGEWIDTH = 64
		};
		enum PAGEHEIGHT
		{
			PAGEHEIGHT = 64
		};
		enum BLOCKWIDTH
		{
			BLOCKWIDTH = 16
		};
		enum BLOCKHEIGHT
		{
			BLOCKHEIGHT = 8
		};
		enum COLUMNWIDTH
		{
			COLUMNWIDTH = 16
		};
		enum COLUMNHEIGHT
		{
			COLUMNHEIGHT = 2
		};

		static const int m_nBlockSwizzleTable[8][4];
		static const int m_nColumnSwizzleTable[2][16];

		typedef uint16 Unit;
	};

	struct STORAGEPSMT8
	{
		enum PAGEWIDTH
		{
			PAGEWIDTH = 128
		};
		enum PAGEHEIGHT
		{
			PAGEHEIGHT = 64
		};
		enum BLOCKWIDTH
		{
			BLOCKWIDTH = 16
		};
		enum BLOCKHEIGHT
		{
			BLOCKHEIGHT = 16
		};
		enum COLUMNWIDTH
		{
			COLUMNWIDTH = 16
		};
		enum COLUMNHEIGHT
		{
			COLUMNHEIGHT = 4
		};

		static const int m_nBlockSwizzleTable[4][8];
		static const int m_nColumnWordTable[2][2][8];

		typedef uint8 Unit;
	};

	struct STORAGEPSMT4
	{
		enum PAGEWIDTH
		{
			PAGEWIDTH = 128
		};
		enum PAGEHEIGHT
		{
			PAGEHEIGHT = 128
		};
		enum BLOCKWIDTH
		{
			BLOCKWIDTH = 32
		};
		enum BLOCKHEIGHT
		{
			BLOCKHEIGHT = 16
		};
		enum COLUMNWIDTH
		{
			COLUMNWIDTH = 32
		};
		enum COLUMNHEIGHT
		{
			COLUMNHEIGHT = 4
		};

		static const int m_nBlockSwizzleTable[8][4];
		static const int m_nColumnWordTable[2][2][8];

		typedef uint8 Unit;
	};

	static unsigned int GetPsmPixelSize(unsigned int);
	static std::pair<uint32, uint32> GetPsmPageSize(unsigned int);
	static bool IsPsmIDTEX(unsigned int);
	static bool IsPsmIDTEX4(unsigned int);
	static bool IsPsmIDTEX8(unsigned int);

	template <typename Storage>
	class CPixelIndexor
	{
	public:
		CPixelIndexor(uint8* pMemory, uint32 nPointer, uint32 nWidth)
		{
			m_nPointer = nPointer;
			m_nWidth = nWidth;
			m_pMemory = pMemory;

			//This might not be thread safe (?)
			if(!m_pageOffsetsInitialized)
			{
				BuildPageOffsetTable();
				m_pageOffsetsInitialized = true;
			}
		}

		typename Storage::Unit GetPixel(unsigned int nX, unsigned int nY)
		{
			return *GetPixelAddress(nX, nY);
		}

		void SetPixel(unsigned int nX, unsigned int nY, typename Storage::Unit nPixel)
		{
			*GetPixelAddress(nX, nY) = nPixel;
		}

		typename Storage::Unit* GetPixelAddress(unsigned int nX, unsigned int nY)
		{
			uint32 pageNum = (nX / Storage::PAGEWIDTH) + (nY / Storage::PAGEHEIGHT) * (m_nWidth * 64) / Storage::PAGEWIDTH;

			nX %= Storage::PAGEWIDTH;
			nY %= Storage::PAGEHEIGHT;

			uint32 pageOffset = m_pageOffsets[nY][nX];
			auto pixelAddr = m_pMemory + ((m_nPointer + (pageNum * PAGESIZE) + pageOffset) & (CGSHandler::RAMSIZE - 1));
			return reinterpret_cast<typename Storage::Unit*>(pixelAddr);
		}

	private:
		void BuildPageOffsetTable()
		{
			for(uint32 y = 0; y < Storage::PAGEHEIGHT; y++)
			{
				for(uint32 x = 0; x < Storage::PAGEWIDTH; x++)
				{
					uint32 workX = x;
					uint32 workY = y;

					uint32 blockNum = Storage::m_nBlockSwizzleTable[workY / Storage::BLOCKHEIGHT][workX / Storage::BLOCKWIDTH];

					workX %= Storage::BLOCKWIDTH;
					workY %= Storage::BLOCKHEIGHT;

					uint32 columnNum = (workY / Storage::COLUMNHEIGHT);

					workY %= Storage::COLUMNHEIGHT;

					uint32 offset = (blockNum * BLOCKSIZE) + (columnNum * COLUMNSIZE) + sizeof(typename Storage::Unit) * Storage::m_nColumnSwizzleTable[workY][workX];
					m_pageOffsets[y][x] = offset;
				}
			}
		}

		uint32 GetColumnAddress(unsigned int& nX, unsigned int& nY)
		{
			uint32 nPageNum = (nX / Storage::PAGEWIDTH) + (nY / Storage::PAGEHEIGHT) * (m_nWidth * 64) / Storage::PAGEWIDTH;

			nX %= Storage::PAGEWIDTH;
			nY %= Storage::PAGEHEIGHT;

			uint32 nBlockNum = Storage::m_nBlockSwizzleTable[nY / Storage::BLOCKHEIGHT][nX / Storage::BLOCKWIDTH];

			nX %= Storage::BLOCKWIDTH;
			nY %= Storage::BLOCKHEIGHT;

			uint32 nColumnNum = (nY / Storage::COLUMNHEIGHT);

			nY %= Storage::COLUMNHEIGHT;

			return (m_nPointer + (nPageNum * PAGESIZE) + (nBlockNum * BLOCKSIZE) + (nColumnNum * COLUMNSIZE)) & (CGSHandler::RAMSIZE - 1);
		}

		uint32 m_nPointer;
		uint32 m_nWidth;
		uint8* m_pMemory;
		static bool m_pageOffsetsInitialized;
		static uint32 m_pageOffsets[Storage::PAGEHEIGHT][Storage::PAGEWIDTH];
	};

	typedef CPixelIndexor<STORAGEPSMCT32> CPixelIndexorPSMCT32;
	typedef CPixelIndexor<STORAGEPSMCT16> CPixelIndexorPSMCT16;
	typedef CPixelIndexor<STORAGEPSMCT16S> CPixelIndexorPSMCT16S;
	typedef CPixelIndexor<STORAGEPSMT8> CPixelIndexorPSMT8;
	typedef CPixelIndexor<STORAGEPSMT4> CPixelIndexorPSMT4;
};

//////////////////////////////////////////////
//Some storage methods templates specializations

template <typename Storage>
bool CGsPixelFormats::CPixelIndexor<Storage>::m_pageOffsetsInitialized = false;

template <typename Storage>
uint32 CGsPixelFormats::CPixelIndexor<Storage>::m_pageOffsets[Storage::PAGEHEIGHT][Storage::PAGEWIDTH];

template <>
inline uint8 CGsPixelFormats::CPixelIndexor<CGsPixelFormats::STORAGEPSMT4>::GetPixel(unsigned int nX, unsigned int nY)
{
	typedef STORAGEPSMT4 Storage;

	uint32 nAddress;
	unsigned int nColumnNum, nSubTable, nShiftAmount;

	nColumnNum = (nY / Storage::COLUMNHEIGHT) & 0x01;
	nAddress = GetColumnAddress(nX, nY);

	nShiftAmount = (nX & 0x18);
	nShiftAmount += (nY & 0x02) << 1;
	nSubTable = (nY & 0x02) >> 1;
	nSubTable ^= (nColumnNum);

	nX &= 0x07;
	nY &= 0x01;

	return (uint8)(((uint32*)&m_pMemory[nAddress])[Storage::m_nColumnWordTable[nSubTable][nY][nX]] >> nShiftAmount) & 0x0F;
}

template <>
inline void CGsPixelFormats::CPixelIndexor<CGsPixelFormats::STORAGEPSMT4>::SetPixel(unsigned int nX, unsigned int nY, uint8 nPixel)
{
	typedef STORAGEPSMT4 Storage;

	uint32 nAddress;
	unsigned int nColumnNum, nSubTable, nShiftAmount;

	nColumnNum = (nY / Storage::COLUMNHEIGHT) & 0x01;
	nAddress = GetColumnAddress(nX, nY);

	nShiftAmount = (nX & 0x18);
	nShiftAmount += (nY & 0x02) << 1;
	nSubTable = (nY & 0x02) >> 1;
	nSubTable ^= (nColumnNum);

	nX &= 0x07;
	nY &= 0x01;

	uint32* pPixel = &(((uint32*)&m_pMemory[nAddress])[Storage::m_nColumnWordTable[nSubTable][nY][nX]]);

	(*pPixel) &= ~(0xF << nShiftAmount);
	(*pPixel) |= (nPixel << nShiftAmount);
}

template <>
inline void CGsPixelFormats::CPixelIndexor<CGsPixelFormats::STORAGEPSMT4>::BuildPageOffsetTable()
{
}

template <>
inline void CGsPixelFormats::CPixelIndexor<CGsPixelFormats::STORAGEPSMT8>::BuildPageOffsetTable()
{
	typedef CGsPixelFormats::STORAGEPSMT8 Storage;

	for(uint32 y = 0; y < Storage::PAGEHEIGHT; y++)
	{
		for(uint32 x = 0; x < Storage::PAGEWIDTH; x++)
		{
			uint32 workX = x;
			uint32 workY = y;

			uint32 blockNum = Storage::m_nBlockSwizzleTable[workY / Storage::BLOCKHEIGHT][workX / Storage::BLOCKWIDTH];

			workX %= Storage::BLOCKWIDTH;
			workY %= Storage::BLOCKHEIGHT;

			uint32 columnNum = (workY / Storage::COLUMNHEIGHT);

			workY %= Storage::COLUMNHEIGHT;

			uint32 table = (workY & 0x02) >> 1;
			uint32 byte = (workX & 0x08) >> 2;
			byte += (workY & 0x02) >> 1;
			table ^= ((y / Storage::COLUMNHEIGHT) & 1);

			workX &= 0x7;
			workY &= 0x1;

			uint32 offset = (blockNum * BLOCKSIZE) + (columnNum * COLUMNSIZE) + (Storage::m_nColumnWordTable[table][workY][workX] * 4) + byte;
			m_pageOffsets[y][x] = offset;
		}
	}
}