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fceu.cpp
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fceu.cpp
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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2003 Xodnizel
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "types.h"
#include "x6502.h"
#include "fceu.h"
#include "ppu.h"
#include "sound.h"
#include "netplay.h"
#include "file.h"
#include "utils/endian.h"
#include "utils/memory.h"
#include "utils/crc32.h"
#include "cart.h"
#include "nsf.h"
#include "fds.h"
#include "ines.h"
#include "unif.h"
#include "cheat.h"
#include "palette.h"
#include "profiler.h"
#include "state.h"
#include "movie.h"
#include "video.h"
#include "input.h"
#include "file.h"
#include "vsuni.h"
#include "ines.h"
#ifdef __WIN_DRIVER__
#include "drivers/win/pref.h"
#include "utils/xstring.h"
extern void CDLoggerROMClosed();
extern void CDLoggerROMChanged();
extern void ResetDebugStatisticsCounters();
extern void SetMainWindowText();
extern bool isTaseditorRecording();
extern int32 fps_scale;
extern int32 fps_scale_unpaused;
extern int32 fps_scale_frameadvance;
#endif
extern void RefreshThrottleFPS();
#ifdef _S9XLUA_H
#include "fceulua.h"
#endif
//TODO - we really need some kind of global platform-specific options api
#ifdef __WIN_DRIVER__
#include "drivers/win/main.h"
#include "drivers/win/memview.h"
#include "drivers/win/cheat.h"
#include "drivers/win/texthook.h"
#include "drivers/win/ram_search.h"
#include "drivers/win/ramwatch.h"
#include "drivers/win/memwatch.h"
#include "drivers/win/tracer.h"
#else
#ifdef __QT_DRIVER__
#include "drivers/Qt/sdl.h"
#else
#include "drivers/sdl/sdl.h"
#endif
#endif
#include <fstream>
#include <sstream>
#include <string>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cstdarg>
#include <ctime>
using namespace std;
//-----------
//overclocking-related
// overclock the console by adding dummy scanlines to PPU loop or to vblank
// disables DMC DMA, WaveHi filling and image rendering for these dummies
// doesn't work with new PPU
bool overclock_enabled = 0;
bool overclocking = 0;
bool skip_7bit_overclocking = 1; // 7-bit samples have priority over overclocking
int normalscanlines;
int totalscanlines;
int postrenderscanlines = 0;
int vblankscanlines = 0;
//------------
int AFon = 1, AFoff = 1, AutoFireOffset = 0; //For keeping track of autofire settings
bool justLagged = false;
bool frameAdvanceLagSkip = false; //If this is true, frame advance will skip over lag frame (i.e. it will emulate 2 frames instead of 1)
bool AutoSS = false; //Flagged true when the first auto-savestate is made while a game is loaded, flagged false on game close
bool movieSubtitles = true; //Toggle for displaying movie subtitles
bool DebuggerWasUpdated = false; //To prevent the debugger from updating things without being updated.
bool AutoResumePlay = false;
char romNameWhenClosingEmulator[2048] = {0};
static unsigned int pauseTimer = 0;
FCEUGI::FCEUGI()
: filename(0),
archiveFilename(0)
{
//printf("%08x",opsize); // WTF?!
}
FCEUGI::~FCEUGI()
{
if (filename)
{
free(filename);
filename = NULL;
}
if (archiveFilename)
{
free(archiveFilename);
archiveFilename = NULL;
}
}
bool CheckFileExists(const char* filename) {
//This function simply checks to see if the given filename exists
if (!filename) return false;
fstream test;
test.open(filename, fstream::in);
if (test.fail()) {
test.close();
return false;
} else {
test.close();
return true;
}
}
void FCEU_TogglePPU(void) {
newppu ^= 1;
if (newppu) {
FCEU_DispMessage("New PPU loaded", 0);
FCEUI_printf("New PPU loaded");
overclock_enabled = 0;
} else {
FCEU_DispMessage("Old PPU loaded", 0);
FCEUI_printf("Old PPU loaded");
}
normalscanlines = (dendy ? 290 : 240)+newppu; // use flag as number!
#ifdef __WIN_DRIVER__
SetMainWindowText();
#endif
}
static void FCEU_CloseGame(void)
{
if (GameInfo)
{
if (AutoResumePlay)
{
// save "-resume" savestate
FCEUSS_Save(FCEU_MakeFName(FCEUMKF_RESUMESTATE, 0, 0).c_str(), false);
}
#ifdef __WIN_DRIVER__
if (storePreferences(mass_replace(LoadedRomFName, "|", ".").c_str()))
FCEUD_PrintError("Couldn't store debugging data");
CDLoggerROMClosed();
#endif
if (FCEUnetplay) {
FCEUD_NetworkClose();
}
if (GameInfo->name) {
free(GameInfo->name);
GameInfo->name = NULL;
}
if (GameInfo->type != GIT_NSF) {
#ifdef __WIN_DRIVER__
if (disableAutoLSCheats == 2)
FCEU_FlushGameCheats(0, 1);
else if (disableAutoLSCheats == 1)
AskSaveCheat();
else if (disableAutoLSCheats == 0)
#endif
FCEU_FlushGameCheats(0, 0);
}
GameInterface(GI_CLOSE);
FCEU_StateRecorderStop();
FCEUI_StopMovie();
ResetExState(0, 0);
//clear screen when game is closed
extern uint8 *XBuf;
if (XBuf)
memset(XBuf, 0, 256 * 256);
FCEU_CloseGenie();
delete GameInfo;
GameInfo = NULL;
currFrameCounter = 0;
//Reset flags for Undo/Redo/Auto Savestating //adelikat: TODO: maybe this stuff would be cleaner as a struct or class
lastSavestateMade.clear();
undoSS = false;
redoSS = false;
lastLoadstateMade.clear();
undoLS = false;
redoLS = false;
AutoSS = false;
}
}
uint64 timestampbase;
FCEUGI *GameInfo = NULL;
void (*GameInterface)(GI h);
void (*GameStateRestore)(int version);
readfunc ARead[0x10000];
writefunc BWrite[0x10000];
static readfunc *AReadG;
static writefunc *BWriteG;
static int RWWrap = 0;
//mbg merge 7/18/06 docs
//bit0 indicates whether emulation is paused
//bit1 indicates whether emulation is in frame step mode
int EmulationPaused = 0;
bool frameAdvanceRequested=false;
int frameAdvance_Delay_count = 0;
int frameAdvance_Delay = FRAMEADVANCE_DELAY_DEFAULT;
//indicates that the emulation core just frame advanced (consumed the frame advance state and paused)
bool JustFrameAdvanced = false;
static int *AutosaveStatus; //is it safe to load Auto-savestate
static int AutosaveIndex = 0; //which Auto-savestate we're on
int AutosaveQty = 4; // Number of Autosaves to store
int AutosaveFrequency = 256; // Number of frames between autosaves
// Flag that indicates whether the Auto-save option is enabled or not
int EnableAutosave = 0;
///a wrapper for unzip.c
extern "C" FILE *FCEUI_UTF8fopen_C(const char *n, const char *m) {
return ::FCEUD_UTF8fopen(n, m);
}
static DECLFW(BNull) {
}
static DECLFR(ANull) {
return(X.DB);
}
int AllocGenieRW(void) {
if (!(AReadG = (readfunc*)FCEU_malloc(0x8000 * sizeof(readfunc))))
return 0;
if (!(BWriteG = (writefunc*)FCEU_malloc(0x8000 * sizeof(writefunc))))
return 0;
RWWrap = 1;
return 1;
}
void FlushGenieRW(void) {
int32 x;
if (RWWrap) {
for (x = 0; x < 0x8000; x++) {
ARead[x + 0x8000] = AReadG[x];
BWrite[x + 0x8000] = BWriteG[x];
}
free(AReadG);
free(BWriteG);
AReadG = NULL;
BWriteG = NULL;
RWWrap = 0;
}
}
readfunc GetReadHandler(int32 a) {
if (a >= 0x8000 && RWWrap)
return AReadG[a - 0x8000];
else
return ARead[a];
}
void SetReadHandler(int32 start, int32 end, readfunc func) {
int32 x;
if (!func)
func = ANull;
if (RWWrap)
for (x = end; x >= start; x--) {
if (x >= 0x8000)
AReadG[x - 0x8000] = func;
else
ARead[x] = func;
}
else
for (x = end; x >= start; x--)
ARead[x] = func;
}
writefunc GetWriteHandler(int32 a) {
if (RWWrap && a >= 0x8000)
return BWriteG[a - 0x8000];
else
return BWrite[a];
}
void SetWriteHandler(int32 start, int32 end, writefunc func) {
int32 x;
if (!func)
func = BNull;
if (RWWrap)
for (x = end; x >= start; x--) {
if (x >= 0x8000)
BWriteG[x - 0x8000] = func;
else
BWrite[x] = func;
}
else
for (x = end; x >= start; x--)
BWrite[x] = func;
}
uint8 *RAM;
//---------
//windows might need to allocate these differently, so we have some special code
static void AllocBuffers() {
RAM = (uint8*)FCEU_gmalloc(0x800);
}
static void FreeBuffers() {
FCEU_free(RAM);
RAM = NULL;
}
//------
uint8 PAL = 0;
static DECLFW(BRAML) {
RAM[A] = V;
}
static DECLFW(BRAMH) {
RAM[A & 0x7FF] = V;
}
static DECLFR(ARAML) {
return RAM[A];
}
static DECLFR(ARAMH) {
return RAM[A & 0x7FF];
}
void ResetGameLoaded(void) {
if (GameInfo) FCEU_CloseGame();
EmulationPaused = 0; //mbg 5/8/08 - loading games while paused was bad news. maybe this fixes it
GameStateRestore = 0;
PPU_hook = NULL;
GameHBIRQHook = NULL;
FFCEUX_PPURead = NULL;
FFCEUX_PPUWrite = NULL;
if (GameExpSound.Kill)
GameExpSound.Kill();
memset(&GameExpSound, 0, sizeof(GameExpSound));
MapIRQHook = NULL;
MMC5Hack = 0;
PEC586Hack = 0;
QTAIHack = 0;
PAL &= 1;
default_palette_selection = 0;
}
int UNIFLoad(const char *name, FCEUFILE *fp);
int iNESLoad(const char *name, FCEUFILE *fp, int OverwriteVidMode);
int FDSLoad(const char *name, FCEUFILE *fp);
int NSFLoad(const char *name, FCEUFILE *fp);
//name should be UTF-8, hopefully, or else there may be trouble
FCEUGI *FCEUI_LoadGameVirtual(const char *name, int OverwriteVidMode, bool silent)
{
//----------
//attempt to open the files
FCEUFILE *fp;
std::string fullname; // this name contains both archive name and ROM file name
int lastpal = PAL;
int lastdendy = dendy;
const char* romextensions[] = { "nes", "fds", "nsf", 0 };
// indicator for if the operaton was canceled by user
// currently there's only one situation:
// the user clicked cancel form the open from archive dialog
int userCancel = 0;
fp = FCEU_fopen(name, LoadedRomFNamePatchToUse[0] ? LoadedRomFNamePatchToUse : nullptr, "rb", 0, -1, romextensions, &userCancel);
if (!fp)
{
// Although !fp, if the operation was canceled from archive select dialog box, don't show the error message;
if (!silent && !userCancel)
FCEU_PrintError("Error opening \"%s\"!", name);
return 0;
}
else if (fp->archiveFilename != "")
{
fullname.assign(fp->archiveFilename.c_str());
fullname.append("|");
fullname.append(fp->filename.c_str());
}
else
{
fullname.assign(name);
}
// reset loaded game BEFORE it's loading.
ResetGameLoaded();
//file opened ok. start loading.
FCEU_printf("Loading %s...\n\n", fullname.c_str());
GetFileBase(fp->filename.c_str());
//reset parameters so they're cleared just in case a format's loader doesn't know to do the clearing
MasterRomInfoParams = TMasterRomInfoParams();
if (!AutosaveStatus)
AutosaveStatus = (int*)FCEU_dmalloc(sizeof(int) * AutosaveQty);
for (AutosaveIndex = 0; AutosaveIndex < AutosaveQty; ++AutosaveIndex)
AutosaveStatus[AutosaveIndex] = 0;
FCEU_CloseGame();
GameInfo = new FCEUGI();
memset( (void*)GameInfo, 0, sizeof(FCEUGI));
GameInfo->filename = strdup(fp->filename.c_str());
if (fp->archiveFilename != "")
GameInfo->archiveFilename = strdup(fp->archiveFilename.c_str());
GameInfo->archiveCount = fp->archiveCount;
GameInfo->soundchan = 0;
GameInfo->soundrate = 0;
GameInfo->name = 0;
GameInfo->type = GIT_CART;
GameInfo->vidsys = GIV_USER;
GameInfo->input[0] = GameInfo->input[1] = SI_UNSET;
GameInfo->inputfc = SIFC_UNSET;
GameInfo->cspecial = SIS_NONE;
//try to load each different format
bool FCEUXLoad(const char *name, FCEUFILE * fp);
int load_result;
load_result = iNESLoad(fullname.c_str(), fp, OverwriteVidMode);
if (load_result == LOADER_INVALID_FORMAT)
{
load_result = NSFLoad(fullname.c_str(), fp);
if (load_result == LOADER_INVALID_FORMAT)
{
load_result = UNIFLoad(fullname.c_str(), fp);
if (load_result == LOADER_INVALID_FORMAT)
{
load_result = FDSLoad(fullname.c_str(), fp);
}
}
}
if (load_result == LOADER_OK)
{
#ifdef __WIN_DRIVER__
// ################################## Start of SP CODE ###########################
extern int loadDebugDataFailed;
if ((loadDebugDataFailed = loadPreferences(mass_replace(LoadedRomFName, "|", ".").c_str())))
if (!silent)
FCEU_printf("Couldn't load debugging data.\n");
// ################################## End of SP CODE ###########################
#endif
if (OverwriteVidMode)
FCEU_ResetVidSys();
if (GameInfo->type != GIT_NSF &&
FSettings.GameGenie &&
FCEU_OpenGenie())
{
FCEUI_SetGameGenie(false);
#ifdef __WIN_DRIVER__
genie = 0;
#endif
}
PowerNES();
if (GameInfo->type != GIT_NSF)
FCEU_LoadGamePalette();
FCEU_ResetPalette();
FCEU_ResetMessages(); // Save state, status messages, etc.
if (!lastpal && PAL) {
FCEU_DispMessage("PAL mode set", 0);
FCEUI_printf("PAL mode set\n");
}
else if (!lastdendy && dendy) {
// this won't happen, since we don't autodetect dendy, but maybe someday we will?
FCEU_DispMessage("Dendy mode set", 0);
FCEUI_printf("Dendy mode set\n");
}
else if ((lastpal || lastdendy) && !(PAL || dendy)) {
FCEU_DispMessage("NTSC mode set", 0);
FCEUI_printf("NTSC mode set\n");
}
if (GameInfo->type != GIT_NSF && !disableAutoLSCheats)
FCEU_LoadGameCheats(0);
if (AutoResumePlay)
{
// load "-resume" savestate
if (FCEUSS_Load(FCEU_MakeFName(FCEUMKF_RESUMESTATE, 0, 0).c_str(), false))
FCEU_DispMessage("Old play session resumed.", 0);
}
ResetScreenshotsCounter();
#ifdef __WIN_DRIVER__
DoDebuggerDataReload(); // Reloads data without reopening window
CDLoggerROMChanged();
if (hMemView) UpdateColorTable();
if (hCheat)
{
UpdateCheatsAdded();
UpdateCheatRelatedWindow();
}
if (FrozenAddressCount)
FCEU_DispMessage("%d cheats active", 0, FrozenAddressCount);
#endif
}
else {
if (!silent)
{
switch (load_result)
{
case LOADER_UNHANDLED_ERROR:
FCEU_PrintError("An error occurred while loading the file.");
break;
case LOADER_INVALID_FORMAT:
FCEU_PrintError("Unknown ROM file format.");
break;
}
}
delete GameInfo;
GameInfo = 0;
}
FCEU_fclose(fp);
if ( FCEU_StateRecorderIsEnabled() )
{
FCEU_StateRecorderStart();
}
return GameInfo;
}
FCEUGI *FCEUI_LoadGame(const char *name, int OverwriteVidMode, bool silent)
{
return FCEUI_LoadGameVirtual(name, OverwriteVidMode, silent);
}
//Return: Flag that indicates whether the function was succesful or not.
bool FCEUI_Initialize() {
srand(time(0));
if (!FCEU_InitVirtualVideo()) {
return false;
}
AllocBuffers();
// Initialize some parts of the settings structure
//mbg 5/7/08 - I changed the ntsc settings to match pal.
//this is more for precision emulation, instead of entertainment, which is what fceux is all about nowadays
memset(&FSettings, 0, sizeof(FSettings));
//FSettings.UsrFirstSLine[0]=8;
FSettings.UsrFirstSLine[0] = 0;
FSettings.UsrFirstSLine[1] = 0;
//FSettings.UsrLastSLine[0]=231;
FSettings.UsrLastSLine[0] = 239;
FSettings.UsrLastSLine[1] = 239;
FSettings.SoundVolume = 150; //0-150 scale
FSettings.TriangleVolume = 256; //0-256 scale (256 is max volume)
FSettings.Square1Volume = 256; //0-256 scale (256 is max volume)
FSettings.Square2Volume = 256; //0-256 scale (256 is max volume)
FSettings.NoiseVolume = 256; //0-256 scale (256 is max volume)
FSettings.PCMVolume = 256; //0-256 scale (256 is max volume)
FCEUPPU_Init();
X6502_Init();
return true;
}
void FCEUI_Kill(void) {
#ifdef _S9XLUA_H
FCEU_LuaStop();
#endif
FCEU_KillVirtualVideo();
FCEU_KillGenie();
FreeBuffers();
}
int rapidAlternator = 0;
//int AutoFirePattern[8] = { 1, 0, 0, 0, 0, 0, 0, 0 };
int AutoFirePatternLength = 2;
void SetAutoFirePattern(int onframes, int offframes)
{
//int i;
//for (i = 0; i < onframes && i < 8; i++) {
// AutoFirePattern[i] = 1;
//}
//for (; i < 8; i++) {
// AutoFirePattern[i] = 0;
//}
//if (onframes + offframes < 2) {
// AutoFirePatternLength = 2;
//} else if (onframes + offframes > 8) {
// AutoFirePatternLength = 8;
//} else {
// AutoFirePatternLength = onframes + offframes;
//}
AutoFirePatternLength = onframes + offframes;
AFon = onframes; AFoff = offframes;
}
void GetAutoFirePattern( int *onframes, int *offframes)
{
if ( onframes )
{
*onframes = AFon;
}
if ( offframes )
{
*offframes = AFoff;
}
}
void SetAutoFireOffset(int offset)
{
if (offset < 0 || offset > 8) return;
AutoFireOffset = offset;
}
bool GetAutoFireState(int btnIdx)
{
return rapidAlternator;
}
void AutoFire(void)
{
static int counter = 0;
if (justLagged == false)
{
//counter = (counter + 1) % (8 * 7 * 5 * 3);
counter = (counter + 1) % AutoFirePatternLength;
}
//If recording a movie, use the frame # for the autofire so the offset
//doesn't get screwed up when loading.
if (FCEUMOV_Mode(MOVIEMODE_RECORD | MOVIEMODE_PLAY))
{
//rapidAlternator = AutoFirePattern[(AutoFireOffset + FCEUMOV_GetFrame()) % AutoFirePatternLength]; //adelikat: TODO: Think through this, MOVIEMODE_FINISHED should not use movie data for auto-fire?
//adelikat: TODO: Think through this, MOVIEMODE_FINISHED should not use movie data for auto-fire?
rapidAlternator = ( (AutoFireOffset + FCEUMOV_GetFrame()) % AutoFirePatternLength ) < AFon;
}
else
{
//rapidAlternator = AutoFirePattern[(AutoFireOffset + counter) % AutoFirePatternLength];
rapidAlternator = ( (AutoFireOffset + counter) % AutoFirePatternLength ) < AFon;
}
}
void UpdateAutosave(void);
#ifdef __QT_DRIVER__
extern unsigned int frameAdvHoldTimer;
#endif
///Emulates a single frame.
///Skip may be passed in, if FRAMESKIP is #defined, to cause this to emulate more than one frame
void FCEUI_Emulate(uint8 **pXBuf, int32 **SoundBuf, int32 *SoundBufSize, int skip) {
FCEU_PROFILE_FUNC(prof, "Emulate Single Frame");
//skip initiates frame skip if 1, or frame skip and sound skip if 2
FCEU_MAYBE_UNUSED int r;
int ssize;
JustFrameAdvanced = false;
if (frameAdvanceRequested)
{
#ifdef __QT_DRIVER__
uint32_t frameAdvanceDelayScaled = frameAdvance_Delay * (PAL ? 20 : 16);
if ( frameAdvanceDelayScaled < 1 )
{
frameAdvanceDelayScaled = 1;
}
if ( (frameAdvance_Delay_count == 0) || (frameAdvHoldTimer >= frameAdvanceDelayScaled) )
{
EmulationPaused = EMULATIONPAUSED_FA;
}
if ( static_cast<unsigned int>(frameAdvance_Delay_count) < frameAdvanceDelayScaled)
{
frameAdvance_Delay_count++;
}
#else
if (frameAdvance_Delay_count == 0 || frameAdvance_Delay_count >= frameAdvance_Delay)
EmulationPaused = EMULATIONPAUSED_FA;
if (frameAdvance_Delay_count < frameAdvance_Delay)
frameAdvance_Delay_count++;
#endif
}
if (EmulationPaused & EMULATIONPAUSED_TIMER)
{
if (pauseTimer > 0)
{
pauseTimer--;
}
else
{
EmulationPaused &= ~EMULATIONPAUSED_TIMER;
}
if (EmulationPaused & EMULATIONPAUSED_PAUSED)
{
EmulationPaused &= ~EMULATIONPAUSED_TIMER;
}
}
if (EmulationPaused & EMULATIONPAUSED_FA)
{
// the user is holding Frame Advance key
// clear paused flag temporarily
EmulationPaused &= ~EMULATIONPAUSED_PAUSED;
#ifdef __WIN_DRIVER__
// different emulation speed when holding Frame Advance
if (fps_scale_frameadvance > 0)
{
fps_scale = fps_scale_frameadvance;
RefreshThrottleFPS();
}
#endif
} else
{
#ifdef __WIN_DRIVER__
if (fps_scale_frameadvance > 0)
{
// restore emulation speed when Frame Advance is not held
fps_scale = fps_scale_unpaused;
RefreshThrottleFPS();
}
#endif
if (EmulationPaused & (EMULATIONPAUSED_PAUSED | EMULATIONPAUSED_TIMER) )
{
// emulator is paused
memcpy(XBuf, XBackBuf, 256*256);
FCEU_PutImage();
*pXBuf = XBuf;
*SoundBuf = WaveFinal;
*SoundBufSize = 0;
return;
}
}
AutoFire();
UpdateAutosave();
FCEU_StateRecorderUpdate();
#ifdef _S9XLUA_H
FCEU_LuaFrameBoundary();
#endif
FCEU_UpdateInput();
lagFlag = 1;
#ifdef _S9XLUA_H
CallRegisteredLuaFunctions(LUACALL_BEFOREEMULATION);
#endif
if (geniestage != 1) FCEU_ApplyPeriodicCheats();
r = FCEUPPU_Loop(skip);
if (skip != 2) ssize = FlushEmulateSound(); //If skip = 2 we are skipping sound processing
//flush tracer once a frame, since we're likely to end up back at a user interaction loop after this with emulation paused
FCEUD_FlushTrace();
#ifdef _S9XLUA_H
CallRegisteredLuaFunctions(LUACALL_AFTEREMULATION);
#endif
FCEU_PutImage();
#ifdef __WIN_DRIVER__
//These Windows only dialogs need to be updated only once per frame so they are included here
// CaH4e3: can't see why, this is only cause problems with selection
// adelikat: selection is only a problem when not paused, it should be paused to select, we want to see the values update
// owomomo: use an OWNERDATA CListCtrl to partially solve the problem
UpdateCheatList();
UpdateTextHooker();
Update_RAM_Search(); // Update_RAM_Watch() is also called.
RamChange();
//FCEUI_AviVideoUpdate(XBuf);
extern int KillFCEUXonFrame;
if (KillFCEUXonFrame && (FCEUMOV_GetFrame() >= KillFCEUXonFrame))
DoFCEUExit();
#else
extern int KillFCEUXonFrame;
if (KillFCEUXonFrame && (FCEUMOV_GetFrame() >= KillFCEUXonFrame))
exit(0);
#endif
timestampbase += timestamp;
timestamp = 0;
soundtimestamp = 0;
*pXBuf = skip ? 0 : XBuf;
if (skip == 2) { //If skip = 2, then bypass sound
*SoundBuf = 0;
*SoundBufSize = 0;
} else {
*SoundBuf = WaveFinal;
*SoundBufSize = ssize;
}
if ((EmulationPaused & EMULATIONPAUSED_FA) && (!frameAdvanceLagSkip || !lagFlag))
//Lots of conditions here. EmulationPaused & EMULATIONPAUSED_FA must be true. In addition frameAdvanceLagSkip or lagFlag must be false
// When Frame Advance is held, emulator is automatically paused after emulating one frame (or several lag frames)
{
EmulationPaused = EMULATIONPAUSED_PAUSED; // restore EMULATIONPAUSED_PAUSED flag and clear EMULATIONPAUSED_FA flag
JustFrameAdvanced = true;
#ifdef __WIN_DRIVER__
if (soundoptions & SO_MUTEFA) //mute the frame advance if the user requested it
*SoundBufSize = 0; //keep sound muted
#endif
}
if (lagFlag) {
lagCounter++;
justLagged = true;
} else justLagged = false;
if (movieSubtitles)
ProcessSubtitles();
}
void FCEUI_CloseGame(void) {
if (!FCEU_IsValidUI(FCEUI_CLOSEGAME))
return;
FCEU_CloseGame();
}
void ResetNES(void) {
FCEUMOV_AddCommand(FCEUNPCMD_RESET);
if (!GameInfo) return;
GameInterface(GI_RESETM2);
FCEUSND_Reset();
FCEUPPU_Reset();
X6502_Reset();
// clear back baffer
extern uint8 *XBackBuf;
memset(XBackBuf, 0, 256 * 256);
FCEU_DispMessage("Reset", 0);
}
int RAMInitSeed = 0;
int RAMInitOption = 0;
u64 splitmix64(u32 input) {
u64 z = (input + 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
return z ^ (z >> 31);
}
static inline u64 xoroshiro128plus_rotl(const u64 x, int k) {
return (x << k) | (x >> (64 - k));
}
u64 xoroshiro128plus_s[2];
void xoroshiro128plus_seed(u32 input)
{
//http:https://xoroshiro.di.unimi.it/splitmix64.c
u64 x = input;
u64 z = (x += 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
xoroshiro128plus_s[0] = z ^ (z >> 31);
z = (x += 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
xoroshiro128plus_s[1] = z ^ (z >> 31);
}
//http:https://vigna.di.unimi.it/xorshift/xoroshiro128plus.c
u64 xoroshiro128plus_next() {
const u64 s0 = xoroshiro128plus_s[0];
u64 s1 = xoroshiro128plus_s[1];
const u64 result = s0 + s1;
s1 ^= s0;
xoroshiro128plus_s[0] = xoroshiro128plus_rotl(s0, 55) ^ s1 ^ (s1 << 14); // a, b
xoroshiro128plus_s[1] = xoroshiro128plus_rotl(s1, 36); // c
return result;
}
void FCEU_MemoryRand(uint8 *ptr, uint32 size, bool default_zero) {
int x = 0;
while (size) {
uint8 v = 0;
switch (RAMInitOption)
{
default:
case 0:
if (!default_zero) v = (x & 4) ? 0xFF : 0x00;
else v = 0x00;
break;
case 1: v = 0xFF; break;
case 2: v = 0x00; break;
case 3: v = (u8)(xoroshiro128plus_next()); break;
// the default is this 8 byte pattern: 00 00 00 00 FF FF FF FF
// it has been used in FCEUX since time immemorial
// Some games to examine uninitialied RAM problems with:
// * Cybernoid - music option starts turned off with default pattern
// * Huang Di - debug mode is enabled with default pattern
// * Minna no Taabou no Nakayoshi Daisakusen - fails to boot with some patterns
// * F-15 City War - high score table
// * 1942 - high score table
// * Cheetahmen II - may start in different levels with different RAM startup
}
*ptr = v;
x++;
size--;