ppu.cpp

SFC游戏模拟器 snes9x 1.43 的原代码

/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 
  (c) Copyright 1996 - 2002 Gary Henderson ([e-mail]) and
                            Jerremy Koot ([e-mail])

  (c) Copyright 2001 - 2004 John Weidman ([e-mail])

  (c) Copyright 2002 - 2004 Brad Jorsch ([e-mail]),
                            funkyass ([e-mail]),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley ([e-mail]),
                            Matthew Kendora,
                            Nach ([e-mail]),
                            Peter Bortas ([e-mail]) and
                            zones ([e-mail])

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight ([e-mail]),
                            _Demo_ ([e-mail]), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar ([e-mail]), _Demo_, Gary Henderson,
                            John Weidman, neviksti ([e-mail]),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare ([e-mail]

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault ([e-mail]) 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 ([e-mail]) 

 
  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.
*******************************************************************************/

#include "snes9x.h"
#include "memmap.h"
#include "ppu.h"
#include "cpuexec.h"
#include "missing.h"
#include "apu.h"
#include "dma.h"
#include "gfx.h"
#include "display.h"
#include "sa1.h"
#include "netplay.h"
#include "sdd1.h"
#include "srtc.h"
#include "spc7110.h"
#include "movie.h"

#ifndef ZSNES_FX
#include "fxemu.h"
#include "fxinst.h"
extern struct FxInit_s SuperFX;
#else
EXTERN_C void S9xSuperFXWriteReg (uint8, uint32);
EXTERN_C uint8 S9xSuperFXReadReg (uint32);
#endif

uint32 justifiers=0xFFFF00AA;
uint8 in_bit=0;

extern uint8 *HDMAMemPointers [8];

static inline void S9xLatchCounters (bool force)
{
	if(!force && !(Memory.FillRAM[0x4213] & 0x80)) return;

	// Latch h and v counters, like the gun
#ifdef DEBUGGER
	missing.h_v_latch = 1;
#endif
#if 0
# ifdef CPU_SHUTDOWN
	CPU.WaitAddress = CPU.PCAtOpcodeStart;
# endif
#endif
	PPU.HVBeamCounterLatched = 1;
	PPU.VBeamPosLatched = (uint16) CPU.V_Counter;
	PPU.HBeamPosLatched = (uint16) ((CPU.Cycles * SNES_HCOUNTER_MAX) / Settings.H_Max);

	// Causes screen flicker for Yoshi's Island if uncommented
	//CLEAR_IRQ_SOURCE (PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE);

	Memory.FillRAM [0x213F] |= 0x40;
}

void S9xUpdateJustifiers();

void S9xUpdateHTimer ()
{
	if (PPU.HTimerEnabled)
	{
#ifdef DEBUGGER
		missing.hirq_pos = PPU.IRQHBeamPos;
#endif
		PPU.HTimerPosition = PPU.IRQHBeamPos * Settings.H_Max / SNES_HCOUNTER_MAX;
		if (PPU.HTimerPosition == Settings.H_Max ||
			PPU.HTimerPosition == Settings.HBlankStart)
		{
			PPU.HTimerPosition--;
		}

		if (!PPU.VTimerEnabled || CPU.V_Counter == PPU.IRQVBeamPos)
		{
			if (PPU.HTimerPosition < CPU.Cycles)
			{
				// Missed the IRQ on this line already
				if (CPU.WhichEvent == HBLANK_END_EVENT ||
					CPU.WhichEvent == HTIMER_AFTER_EVENT)
				{
					CPU.WhichEvent = HBLANK_END_EVENT;
					CPU.NextEvent = Settings.H_Max;
				}
				else
				{
					CPU.WhichEvent = HBLANK_START_EVENT;
					CPU.NextEvent = Settings.HBlankStart;
				}
			}
			else
			{
				if (CPU.WhichEvent == HTIMER_BEFORE_EVENT ||
					CPU.WhichEvent == HBLANK_START_EVENT)
				{
					if (PPU.HTimerPosition > Settings.HBlankStart)
					{
						// HTimer was to trigger before h-blank start,
						// now triggers after start of h-blank
						CPU.NextEvent = Settings.HBlankStart;
						CPU.WhichEvent = HBLANK_START_EVENT;
					}
					else
					{
						CPU.NextEvent = PPU.HTimerPosition;
						CPU.WhichEvent = HTIMER_BEFORE_EVENT;
					}
				}
				else
				{
					CPU.WhichEvent = HTIMER_AFTER_EVENT;
					CPU.NextEvent = PPU.HTimerPosition;
				}
			}
		}
	}
}

void S9xFixColourBrightness ()
{
    IPPU.XB = mul_brightness [PPU.Brightness];
    if (Settings.SixteenBit)
	{
		for (int i = 0; i < 256; i++)
		{
			IPPU.Red [i] = IPPU.XB [PPU.CGDATA [i] & 0x1f];
			IPPU.Green [i] = IPPU.XB [(PPU.CGDATA [i] >> 5) & 0x1f];
			IPPU.Blue [i] = IPPU.XB [(PPU.CGDATA [i] >> 10) & 0x1f];
			IPPU.ScreenColors [i] = BUILD_PIXEL (IPPU.Red [i], IPPU.Green [i],
												 IPPU.Blue [i]);
		}
	}
}

/******************************************************************************/
/* S9xSetPPU()                                                                */
/* This function sets a PPU Register to a specific byte                       */
/******************************************************************************/
void S9xSetPPU (uint8 Byte, uint16 Address)
{
//    fprintf(stderr, "%03d: %02x to %04x\n", CPU.V_Counter, Byte, Address);
	if (Address <= 0x2183)
	{
		switch (Address)
		{
		  case 0x2100:
			// Brightness and screen blank bit
			if (Byte != Memory.FillRAM [0x2100])
			{
				FLUSH_REDRAW ();
				if (PPU.Brightness != (Byte & 0xF))
				{
					IPPU.ColorsChanged = TRUE;
					IPPU.DirectColourMapsNeedRebuild = TRUE;
					PPU.Brightness = Byte & 0xF;
					S9xFixColourBrightness ();
					if (PPU.Brightness > IPPU.MaxBrightness)
						IPPU.MaxBrightness = PPU.Brightness;
				}
				if ((Memory.FillRAM[0x2100] & 0x80) != (Byte & 0x80))
				{
					IPPU.ColorsChanged = TRUE;
					PPU.ForcedBlanking = (Byte >> 7) & 1;
				}
			}
			break;

		  case 0x2101:
			// Sprite (OBJ) tile address
			if (Byte != Memory.FillRAM [0x2101])
			{
				FLUSH_REDRAW ();
				PPU.OBJNameBase   = (Byte & 3) << 14;
				PPU.OBJNameSelect = ((Byte >> 3) & 3) << 13;
				PPU.OBJSizeSelect = (Byte >> 5) & 7;
				IPPU.OBJChanged = TRUE;
			}
			break;

		  case 0x2102:
			// Sprite write address (low)
			PPU.OAMAddr = ((Memory.FillRAM[0x2103]&1)<<8) | Byte;
			PPU.OAMFlip = 2;
			PPU.OAMReadFlip = 0;
			PPU.SavedOAMAddr = PPU.OAMAddr;
			if (PPU.OAMPriorityRotation && PPU.FirstSprite != (PPU.OAMAddr >> 1))
			{
				PPU.FirstSprite = (PPU.OAMAddr&0xFE) >> 1;
				IPPU.OBJChanged = TRUE;
#ifdef DEBUGGER
				missing.sprite_priority_rotation = 1;
#endif
			}
			break;

		  case 0x2103:
			// Sprite register write address (high), sprite priority rotation
			// bit.
			PPU.OAMAddr = ((Byte&1)<<8) | Memory.FillRAM[0x2102];

                        PPU.OAMPriorityRotation=(Byte & 0x80)? 1 : 0;
			if (PPU.OAMPriorityRotation)
			{
				if (PPU.FirstSprite != (PPU.OAMAddr >> 1))
				{
					PPU.FirstSprite = (PPU.OAMAddr&0xFE) >> 1;
					IPPU.OBJChanged = TRUE;
#ifdef DEBUGGER
					missing.sprite_priority_rotation = 1;
#endif
				}
			} else {
				if (PPU.FirstSprite != 0)
				{
					PPU.FirstSprite = 0;
					IPPU.OBJChanged = TRUE;
#ifdef DEBUGGER
					missing.sprite_priority_rotation = 1;
#endif
				}
			}
			PPU.OAMFlip = 0;
			PPU.OAMReadFlip = 0;
			PPU.SavedOAMAddr = PPU.OAMAddr;
			break;

		  case 0x2104:
			// Sprite register write
			REGISTER_2104(Byte);
			break;

		  case 0x2105:
			// Screen mode (0 - 7), background tile sizes and background 3
			// priority
			if (Byte != Memory.FillRAM [0x2105])
			{
				FLUSH_REDRAW ();
				PPU.BG[0].BGSize = (Byte >> 4) & 1;
				PPU.BG[1].BGSize = (Byte >> 5) & 1;
				PPU.BG[2].BGSize = (Byte >> 6) & 1;
				PPU.BG[3].BGSize = (Byte >> 7) & 1;
				PPU.BGMode = Byte & 7;
				// BJ: BG3Priority only takes effect if BGMode==1 and the bit is set
				PPU.BG3Priority  = ((Byte & 0x0f) == 0x09);
#ifdef DEBUGGER
				missing.modes[PPU.BGMode] = 1;
#endif
				if(PPU.BGMode==5||PPU.BGMode==6)
					IPPU.Interlace = Memory.FillRAM[0x2133]&1;
			}
			break;

		  case 0x2106:
			// Mosaic pixel size and enable
			if (Byte != Memory.FillRAM [0x2106])
			{
				FLUSH_REDRAW ();
#ifdef DEBUGGER
				if ((Byte & 0xf0) && (Byte & 0x0f))
					missing.mosaic = 1;
#endif
				PPU.Mosaic = (Byte >> 4) + 1;
				PPU.BGMosaic [0] = (Byte & 1) && PPU.Mosaic > 1;
				PPU.BGMosaic [1] = (Byte & 2) && PPU.Mosaic > 1;
				PPU.BGMosaic [2] = (Byte & 4) && PPU.Mosaic > 1;
				PPU.BGMosaic [3] = (Byte & 8) && PPU.Mosaic > 1;
			}
			break;
		  case 0x2107:		// [BG0SC]
			if (Byte != Memory.FillRAM [0x2107])
			{
				FLUSH_REDRAW ();
				PPU.BG[0].SCSize = Byte & 3;
				PPU.BG[0].SCBase = (Byte & 0x7c) << 8;
			}
			break;

		  case 0x2108:		// [BG1SC]
			if (Byte != Memory.FillRAM [0x2108])
			{
				FLUSH_REDRAW ();
				PPU.BG[1].SCSize = Byte & 3;
				PPU.BG[1].SCBase = (Byte & 0x7c) << 8;
			}
			break;

		  case 0x2109:		// [BG2SC]
			if (Byte != Memory.FillRAM [0x2109])
			{
				FLUSH_REDRAW ();
				PPU.BG[2].SCSize = Byte & 3;
				PPU.BG[2].SCBase = (Byte & 0x7c) << 8;
			}
			break;

		  case 0x210A:		// [BG3SC]
			if (Byte != Memory.FillRAM [0x210a])
			{
				FLUSH_REDRAW ();
				PPU.BG[3].SCSize = Byte & 3;
				PPU.BG[3].SCBase = (Byte & 0x7c) << 8;
			}
			break;

		  case 0x210B:		// [BG01NBA]
			if (Byte != Memory.FillRAM [0x210b])
			{
				FLUSH_REDRAW ();
				PPU.BG[0].NameBase    = (Byte & 7) << 12;
				PPU.BG[1].NameBase    = ((Byte >> 4) & 7) << 12;
			}
			break;

		  case 0x210C:		// [BG23NBA]
			if (Byte != Memory.FillRAM [0x210c])
			{
				FLUSH_REDRAW ();
				PPU.BG[2].NameBase    = (Byte & 7) << 12;
				PPU.BG[3].NameBase    = ((Byte >> 4) & 7) << 12;
			}
			break;


			//This is the Theme Park fix - it appears all these registers
			//share a previous byte value for setting them.

		  case 0x210D:
			//TEST9        if(last_written != 0x210d) PPU.BGnxOFSbyte = 0;
			PPU.BG[0].HOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[0].HOffset = %04x  %d)\n", Byte, Address, PPU.BG[0].HOffset, CPU.V_Counter);
			break;

		  case 0x210E:
			PPU.BG[0].VOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[0].VOffset = %04x  %d)\n", Byte, Address, PPU.BG[0].VOffset, CPU.V_Counter);
			break;

		  case 0x210F:
			PPU.BG[1].HOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[1].HOffset = %04x  %d)\n", Byte, Address, PPU.BG[1].HOffset, CPU.V_Counter);
			break;

		  case 0x2110:
			PPU.BG[1].VOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[1].VOffset = %04x  %d)\n", Byte, Address, PPU.BG[1].VOffset, CPU.V_Counter);
			break;

		  case 0x2111:
			PPU.BG[2].HOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[2].HOffset = %04x  %d)\n", Byte, Address, PPU.BG[2].HOffset, CPU.V_Counter);
			break;

		  case 0x2112:
			PPU.BG[2].VOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[2].VOffset = %04x  %d)\n", Byte, Address, PPU.BG[2].VOffset, CPU.V_Counter);
			break;

		  case 0x2113:
			PPU.BG[3].HOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[3].HOffset = %04x  %d)\n", Byte, Address, PPU.BG[3].HOffset, CPU.V_Counter);
			break;

		  case 0x2114:
			PPU.BG[3].VOffset = (Byte<<8) | PPU.BGnxOFSbyte;
			PPU.BGnxOFSbyte = Byte;
			//        fprintf(stderr, "%02x to %04x (PPU.BG[3].VOffset = %04x  %d)\n", Byte, Address, PPU.BG[3].VOffset, CPU.V_Counter);
			break;

			//end Theme Park

		  case 0x2115:
			// VRAM byte/word access flag and increment
			PPU.VMA.High = (Byte & 0x80) == 0 ? FALSE : TRUE;
			switch (Byte & 3)
			{
			  case 0:
				PPU.VMA.Increment = 1;
				break;
			  case 1:
				PPU.VMA.Increment = 32;
				break;
			  case 2:
				PPU.VMA.Increment = 128;
				break;
			  case 3:
				PPU.VMA.Increment = 128;
				break;
			}
#ifdef DEBUGGER
			if ((Byte & 3) != 0)
				missing.vram_inc = Byte & 3;
#endif
			if (Byte & 0x0c)
			{
				static uint16 IncCount [4] = { 0, 32, 64, 128 };
				static uint16 Shift [4] = { 0, 5, 6, 7 };
#ifdef DEBUGGER
				missing.vram_full_graphic_inc = (Byte & 0x0c) >> 2;
#endif
//				PPU.VMA.Increment = 1;
				uint8 i = (Byte & 0x0c) >> 2;
				PPU.VMA.FullGraphicCount = IncCount [i];
				PPU.VMA.Mask1 = IncCount [i] * 8 - 1;
				PPU.VMA.Shift = Shift [i];
			}
			else
				PPU.VMA.FullGraphicCount = 0;
			break;

		  case 0x2116:
			// VRAM read/write address (low)
			PPU.VMA.Address &= 0xFF00;
			PPU.VMA.Address |= Byte;
#ifdef CORRECT_VRAM_READS
			if (PPU.VMA.FullGraphicCount)
			{
				uint32 addr = PPU.VMA.Address;
				uint32 rem = addr & PPU.VMA.Mask1;
				uint32 address = (addr & ~PPU.VMA.Mask1) +
					(rem >> PPU.VMA.Shift) +
					((rem & (PPU.VMA.FullGraphicCount - 1)) << 3);
				IPPU.VRAMReadBuffer = READ_WORD(Memory.VRAM+((address << 1) & 0xFFFF));
			} else
				IPPU.VRAMReadBuffer = READ_WORD(Memory.VRAM+((PPU.VMA.Address << 1) & 0xffff));
#else
			IPPU.FirstVRAMRead = TRUE;
#endif
			break;

		  case 0x2117:
			// VRAM read/write address (high)
			PPU.VMA.Address &= 0x00FF;
			PPU.VMA.Address |= Byte << 8;
#ifdef CORRECT_VRAM_READS
			if (PPU.VMA.FullGraphicCount)
			{
				uint32 addr = PPU.VMA.Address;
				uint32 rem = addr & PPU.VMA.Mask1;