154 lines
3.9 KiB
C++
154 lines
3.9 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// //
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// NES PPU core //
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// Norix //
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// written 2001/02/22 //
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// last modify ----/--/-- //
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//////////////////////////////////////////////////////////////////////////
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#ifndef __PPU_INCLUDED__
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#define __PPU_INCLUDED__
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#include "typedef.h"
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#include "macro.h"
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// class prototype
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class NES;
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// PPU Control Register #1 PPU #0
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#define PPU_VBLANK_BIT 0x80
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#define PPU_SPHIT_BIT 0x40 // ˆá‚¤<E2809A>H
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#define PPU_SP16_BIT 0x20
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#define PPU_BGTBL_BIT 0x10
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#define PPU_SPTBL_BIT 0x08
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#define PPU_INC32_BIT 0x04
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#define PPU_NAMETBL_BIT 0x03
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// PPU Control Register #2 PPU #1
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#define PPU_BGCOLOR_BIT 0xE0
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#define PPU_SPDISP_BIT 0x10
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#define PPU_BGDISP_BIT 0x08
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#define PPU_SPCLIP_BIT 0x04
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#define PPU_BGCLIP_BIT 0x02
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#define PPU_COLORMODE_BIT 0x01
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// PPU Status Register PPU #2
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#define PPU_VBLANK_FLAG 0x80
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#define PPU_SPHIT_FLAG 0x40
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#define PPU_SPMAX_FLAG 0x20
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#define PPU_WENABLE_FLAG 0x10
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// SPRITE Attribute
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#define SP_VMIRROR_BIT 0x80
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#define SP_HMIRROR_BIT 0x40
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#define SP_PRIORITY_BIT 0x20
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#define SP_COLOR_BIT 0x03
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class PPU
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{
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public:
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PPU( NES* parent );
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virtual ~PPU();
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enum { SCREEN_WIDTH = 256+16, SCREEN_HEIGHT = 240 };
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void Reset();
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BYTE Read ( WORD addr );
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void Write( WORD addr, BYTE data );
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void DMA( BYTE data );
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void VBlankStart();
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void VBlankEnd();
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void FrameStart();
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void FrameEnd();
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void SetRenderScanline( INT scanline );
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void ScanlineStart();
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void ScanlineNext();
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WORD GetPPUADDR() { return loopy_v; }
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WORD GetTILEY() { return loopy_y; }
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// Scanline base render
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void Scanline( INT scanline, BOOL bMax, BOOL bLeftClip );
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void DummyScanline( INT scanline );
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// For mapper
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void SetExtLatchMode( BOOL bMode ) { bExtLatch = bMode; }
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void SetChrLatchMode( BOOL bMode ) { bChrLatch = bMode; }
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void SetExtNameTableMode( BOOL bMode ) { bExtNameTable = bMode; }
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void SetExtMonoMode( BOOL bMode ) { bExtMono = bMode; }
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void SetVromWrite(BOOL bMode) { bVromWe = bMode;}
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BOOL IsVromWrite() { return bVromWe; }
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BOOL GetExtMonoMode() { return bExtMono; }
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BOOL IsDispON() { return PPUREG[1]&(PPU_BGDISP_BIT|PPU_SPDISP_BIT); }
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BOOL IsBGON() { return PPUREG[1]&PPU_BGDISP_BIT; }
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BOOL IsSPON() { return PPUREG[1]&PPU_SPDISP_BIT; }
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BYTE GetBGCOLOR() { return (PPUREG[1]&PPU_BGCOLOR_BIT)>>5; }
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BOOL IsBGCLIP() { return PPUREG[1]&PPU_BGCLIP_BIT; }
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BOOL IsSPCLIP() { return PPUREG[1]&PPU_SPCLIP_BIT; }
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BOOL IsMONOCROME() { return PPUREG[1]&PPU_COLORMODE_BIT; }
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BOOL IsVBLANK() { return PPUREG[2]&PPU_VBLANK_FLAG; }
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BOOL IsSPHIT() { return PPUREG[2]&PPU_SPHIT_FLAG; }
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BOOL IsSPMAX() { return PPUREG[2]&PPU_SPMAX_FLAG; }
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BOOL IsPPUWE() { return PPUREG[2]&PPU_WENABLE_FLAG; }
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BOOL IsSprite0( INT scanline );
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void SetScreenPtr( LPBYTE lpScn, LPBYTE lpMode ) { lpScreen = lpScn; lpColormode = lpMode; }
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LPBYTE GetScreenPtr() { return lpScreen; }
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INT GetScanlineNo() { return ScanlineNo; }
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// For VS-Unisystem
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void SetVSMode( BOOL bMode ) { bVSMode = bMode; }
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void SetVSSecurity( BYTE data ) { VSSecurityData = data; }
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void SetVSColorMap( INT nColorMap ) { nVSColorMap = nColorMap; }
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protected:
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NES* nes;
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BOOL bExtLatch; // For MMC5
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BOOL bChrLatch; // For MMC2/MMC4
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BOOL bExtNameTable; // For Super Monkey no Dai Bouken
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BOOL bExtMono; // For Final Fantasy
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BOOL bVromWe; // For Mapper74 and others
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WORD loopy_y;
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WORD loopy_shift;
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LPBYTE lpScreen;
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LPBYTE lpScanline;
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INT ScanlineNo;
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LPBYTE lpColormode;
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typedef struct tagSPRITE {
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BYTE y;
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BYTE tile;
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BYTE attr;
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BYTE x;
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} SPRITE, *LPSPRITE;
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// Reversed bits
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BYTE Bit2Rev[256];
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// For VS-Unisystem
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BOOL bVSMode;
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BYTE VSSecurityData;
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INT nVSColorMap;
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static BYTE VSColorMap[5][64];
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private:
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};
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#endif // !__PPU_INCLUDED__
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