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CATSFC/source/ppu.h
Nebuleon Fumika a0d0c5e7a5 Eliminate the latency of button press recognition, which was bad enough to lose keys entirely sometimes, and could otherwise delay a button press or release by 200 ms. 
This was the entire reason I created the fork, and I finally did it! It syncs the controls every scanline of a frame, which costs about 60,000 MIPS instructions per frame to deal with. Luckily, the processor runs at 396 MHz, which means the cost of checking the controls is 1% of the CPU's power.
2012-12-21 03:50:10 -05:00

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/*******************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
funkyass (funkyass@spam.shaw.ca),
Joel Yliluoma (http://iki.fi/bisqwit/)
Kris Bleakley (codeviolation@hotmail.com),
Matthew Kendora,
Nach (n-a-c-h@users.sourceforge.net),
Peter Bortas (peter@bortas.org) and
zones (kasumitokoduck@yahoo.com)
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
_Demo_ (_demo_@zsnes.com), and Nach
C4 C++ code
(c) Copyright 2003 Brad Jorsch
DSP-1 emulator code
(c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
John Weidman, neviksti (neviksti@hotmail.com),
Kris Bleakley, Andreas Naive
DSP-2 emulator code
(c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
Lord Nightmare (lord_nightmare@users.sourceforge.net
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
Kris Bleakley
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code
(c) Copyright 2002 Matthew Kendora with research by
zsKnight, John Weidman, and Dark Force
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive and John Weidman
S-RTC C emulator code
(c) Copyright 2001 John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com
Permission to use, copy, modify and distribute Snes9x in both binary and
source form, for non-commercial purposes, is hereby granted without fee,
providing that this license information and copyright notice appear with
all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes
charging money for Snes9x or software derived from Snes9x.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
*******************************************************************************/
#ifndef _PPU_H_
#define _PPU_H_
#define FIRST_VISIBLE_LINE 1
extern uint8 GetBank;
extern uint16 SignExtend [2];
#define TILE_2BIT 0
#define TILE_4BIT 1
#define TILE_8BIT 2
#define MAX_2BIT_TILES 4096
#define MAX_4BIT_TILES 2048
#define MAX_8BIT_TILES 1024
#define PPU_H_BEAM_IRQ_SOURCE (1 << 0)
#define PPU_V_BEAM_IRQ_SOURCE (1 << 1)
#define GSU_IRQ_SOURCE (1 << 2)
#define SA1_IRQ_SOURCE (1 << 7)
#define SA1_DMA_IRQ_SOURCE (1 << 5)
struct ClipData {
uint32 Count [6];
uint32 Left [6][6];
uint32 Right [6][6];
};
struct InternalPPU {
bool8 ColorsChanged;
uint8 HDMA;
bool8 HDMAStarted;
uint8 MaxBrightness;
bool8 LatchedBlanking;
bool8 OBJChanged;
bool8 RenderThisFrame;
bool8 DirectColourMapsNeedRebuild;
uint32 FrameCount;
uint32 RenderedFramesCount;
uint32 DisplayedRenderedFrameCount;
uint32 SkippedFrames;
uint32 FrameSkip;
uint8 *TileCache [3];
uint8 *TileCached [3];
#ifdef CORRECT_VRAM_READS
uint16 VRAMReadBuffer;
#else
bool8 FirstVRAMRead;
#endif
bool8 DoubleHeightPixels;
bool8 Interlace;
bool8 InterlaceSprites;
bool8 DoubleWidthPixels;
int RenderedScreenHeight;
int RenderedScreenWidth;
uint32 Red [256];
uint32 Green [256];
uint32 Blue [256];
uint8 *XB;
uint16 ScreenColors [256];
int PreviousLine;
int CurrentLine;
int Controller;
uint32 Joypads[5];
#ifdef SYNC_JOYPAD_AT_HBLANK
uint32 JoypadsAtHBlanks[5][SNES_MAX_PAL_VCOUNTER];
#endif
uint32 SuperScope;
uint32 Mouse[2];
int PrevMouseX[2];
int PrevMouseY[2];
struct ClipData Clip [2];
};
struct SOBJ
{
short HPos;
uint16 VPos;
uint16 Name;
uint8 VFlip;
uint8 HFlip;
uint8 Priority;
uint8 Palette;
uint8 Size;
};
struct SPPU {
uint8 BGMode;
uint8 BG3Priority;
uint8 Brightness;
struct {
bool8 High;
uint8 Increment;
uint16 Address;
uint16 Mask1;
uint16 FullGraphicCount;
uint16 Shift;
} VMA;
struct {
uint16 SCBase;
uint16 VOffset;
uint16 HOffset;
uint8 BGSize;
uint16 NameBase;
uint16 SCSize;
} BG [4];
bool8 CGFLIP;
uint16 CGDATA [256];
uint8 FirstSprite;
uint8 LastSprite;
struct SOBJ OBJ [128];
uint8 OAMPriorityRotation;
uint16 OAMAddr;
uint8 RangeTimeOver;
uint8 OAMFlip;
uint16 OAMTileAddress;
uint16 IRQVBeamPos;
uint16 IRQHBeamPos;
uint16 VBeamPosLatched;
uint16 HBeamPosLatched;
uint8 HBeamFlip;
uint8 VBeamFlip;
uint8 HVBeamCounterLatched;
short MatrixA;
short MatrixB;
short MatrixC;
short MatrixD;
short CentreX;
short CentreY;
uint8 Joypad1ButtonReadPos;
uint8 Joypad2ButtonReadPos;
uint8 CGADD;
uint8 FixedColourRed;
uint8 FixedColourGreen;
uint8 FixedColourBlue;
uint16 SavedOAMAddr;
uint16 ScreenHeight;
uint32 WRAM;
uint8 BG_Forced;
bool8 ForcedBlanking;
bool8 OBJThroughMain;
bool8 OBJThroughSub;
uint8 OBJSizeSelect;
uint16 OBJNameBase;
bool8 OBJAddition;
uint8 OAMReadFlip;
uint8 OAMData [512 + 32];
bool8 VTimerEnabled;
bool8 HTimerEnabled;
short HTimerPosition;
uint8 Mosaic;
bool8 BGMosaic [4];
bool8 Mode7HFlip;
bool8 Mode7VFlip;
uint8 Mode7Repeat;
uint8 Window1Left;
uint8 Window1Right;
uint8 Window2Left;
uint8 Window2Right;
uint8 ClipCounts [6];
uint8 ClipWindowOverlapLogic [6];
uint8 ClipWindow1Enable [6];
uint8 ClipWindow2Enable [6];
bool8 ClipWindow1Inside [6];
bool8 ClipWindow2Inside [6];
bool8 RecomputeClipWindows;
uint8 CGFLIPRead;
uint16 OBJNameSelect;
bool8 Need16x8Mulitply;
uint8 Joypad3ButtonReadPos;
uint8 MouseSpeed[2];
// XXX Do these need to be added to snapshot.cpp?
uint16 OAMWriteRegister;
uint8 BGnxOFSbyte;
#ifndef NO_OPEN_BUS
uint8 OpenBus1;
uint8 OpenBus2;
#endif
};
#define CLIP_OR 0
#define CLIP_AND 1
#define CLIP_XOR 2
#define CLIP_XNOR 3
struct SDMA {
bool8 TransferDirection;
bool8 AAddressFixed;
bool8 AAddressDecrement;
uint8 TransferMode;
uint8 ABank;
uint16 AAddress;
uint16 Address;
uint8 BAddress;
// General DMA only:
uint16 TransferBytes;
// H-DMA only:
bool8 HDMAIndirectAddressing;
uint16 IndirectAddress;
uint8 IndirectBank;
uint8 Repeat;
uint8 LineCount;
uint8 FirstLine;
};
START_EXTERN_C
void S9xUpdateScreen ();
void S9xResetPPU ();
void S9xSoftResetPPU ();
void S9xFixColourBrightness ();
void S9xUpdateJoypads ();
void S9xProcessMouse(int which1);
void S9xSuperFXExec ();
void S9xSetPPU (uint8 Byte, uint16 Address);
uint8 S9xGetPPU (uint16 Address);
void S9xSetCPU (uint8 Byte, uint16 Address);
uint8 S9xGetCPU (uint16 Address);
void S9xInitC4 ();
void S9xSetC4 (uint8 Byte, uint16 Address);
uint8 S9xGetC4 (uint16 Address);
void S9xSetC4RAM (uint8 Byte, uint16 Address);
uint8 S9xGetC4RAM (uint16 Address);
extern struct SPPU PPU;
extern struct SDMA DMA [8];
extern struct InternalPPU IPPU;
END_EXTERN_C
#include "gfx.h"
#include "memmap.h"
typedef struct{
uint8 _5C77;
uint8 _5C78;
uint8 _5A22;
} SnesModel;
START_EXTERN_C
extern SnesModel* Model;
extern SnesModel M1SNES;
extern SnesModel M2SNES;
END_EXTERN_C
#define MAX_5C77_VERSION 0x01
#define MAX_5C78_VERSION 0x03
#define MAX_5A22_VERSION 0x02
extern uint8 REGISTER_4212();
extern void FLUSH_REDRAW ();
extern void REGISTER_2104 (uint8 byte);
extern void REGISTER_2118 (uint8 Byte);
extern void REGISTER_2118_tile (uint8 Byte);
extern void REGISTER_2118_linear (uint8 Byte);
extern void REGISTER_2119 (uint8 Byte);
extern void REGISTER_2119_tile (uint8 Byte);
extern void REGISTER_2119_linear (uint8 Byte);
extern void REGISTER_2122(uint8 Byte);
extern void REGISTER_2180(uint8 Byte);
//Platform specific input functions used by PPU.CPP
void JustifierButtons(uint32&);
bool JustifierOffscreen();
#endif
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