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metaforce/NESEmulator/CNESEmulator.cpp

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#include "CNESEmulator.hpp"
#include "CNESShader.hpp"
#include "CGameState.hpp"
#include "Input/CFinalInput.hpp"
#include "logvisor/logvisor.hpp"
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cstdbool>
#include <cstring>
#include "malloc.h"
#include <cinttypes>
#include <cctype>
#include <ctime>
#include <cmath>
static urde::MP1::CNESEmulator* EmulatorInst = nullptr;
extern "C"
{
#include "fixNES/mapper.h"
#include "fixNES/cpu.h"
#include "fixNES/ppu.h"
#include "fixNES/mem.h"
#include "fixNES/input.h"
#include "fixNES/fm2play.h"
#include "fixNES/apu.h"
#include "fixNES/audio_fds.h"
#include "fixNES/audio_vrc7.h"
#include "fixNES/mapper_h/nsf.h"
/*
* Portions Copyright (C) 2017 FIX94
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
#define DEBUG_HZ 0
#define DEBUG_MAIN_CALLS 0
#define DEBUG_KEY 0
#define DEBUG_LOAD_INFO 1
#ifndef _WIN32
std::chrono::steady_clock::time_point s_tp = std::chrono::steady_clock::now();
static std::chrono::milliseconds::rep GetTickCount()
{
return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - s_tp).count();
}
#endif
static const char *VERSION_STRING = "fixNES Alpha v1.0.5";
static char window_title[256];
static char window_title_pause[256];
enum {
FTYPE_UNK = 0,
FTYPE_NES,
FTYPE_NSF,
FTYPE_FDS,
FTYPE_QD,
#if ZIPSUPPORT
FTYPE_ZIP,
#endif
};
static void nesEmuFdsSetup(uint8_t *src, uint8_t *dst);
static int emuFileType = FTYPE_UNK;
static char emuFileName[1024];
static uint8_t *emuNesROM = NULL;
static uint32_t emuNesROMsize = 0;
static char emuSaveName[1024];
static uint8_t *emuPrgRAM = NULL;
static uint32_t emuPrgRAMsize = 0;
//used externally
uint32_t textureImage[0xF000];
bool nesPause = false;
bool ppuDebugPauseFrame = false;
bool doOverscan = false;
bool nesPAL = false;
bool nesEmuNSFPlayback = false;
static bool inPause = false;
static bool inOverscanToggle = false;
static bool inResize = false;
static bool inDiskSwitch = false;
static bool inReset = false;
#if DEBUG_HZ
static int emuFrameStart = 0;
static int emuTimesCalled = 0;
static int emuTotalElapsed = 0;
#endif
#if DEBUG_MAIN_CALLS
static int emuMainFrameStart = 0;
static int emuMainTimesCalled = 0;
static int emuMainTimesSkipped = 0;
static int emuMainTotalElapsed = 0;
#endif
#define DOTS 341
#define VISIBLE_DOTS 256
#define VISIBLE_LINES 240
static uint32_t linesToDraw = VISIBLE_LINES;
static const uint32_t visibleImg = VISIBLE_DOTS*VISIBLE_LINES*4;
static uint8_t scaleFactor = 2;
static bool emuSaveEnabled = false;
static bool emuFdsHasSideB = false;
static uint32_t mainLoopRuns;
static uint32_t mainLoopPos;
static uint16_t ppuCycleTimer;
static uint16_t cpuCycleTimer;
//from input.c
extern uint8_t inValReads[8];
//from mapper.c
extern bool mapperUse78A;
//from m32.c
extern bool m32_singlescreen;
static volatile bool emuRenderFrame = false;
//used externally
bool emuSkipVsync = false;
bool emuSkipFrame = false;
//static uint32_t mCycles = 0;
static uint16_t mainClock = 1;
static uint16_t apuClock = 1;
static uint16_t ppuClock = 1;
static uint16_t vrc7Clock = 1;
extern bool fdsSwitch;
bool apuCycleURDE();
uint8_t* ppuGetVRAM();
int audioUpdate()
{
if (!EmulatorInst)
return 0;
return EmulatorInst->audioUpdate();
}
}
namespace urde::MP1
{
bool CNESEmulator::EmulatorConstructed = false;
static logvisor::Module Log("CNESEmulator");
#define NESEMUP_ROM_OFFSET 0xa3f8
#define METROID_PAL false
#define METROID_MAPPER 1
#define METROID_SAVE_ENABLED false
#define METROID_TRAINER false
#define METROID_PRG_SIZE (8 * 0x4000)
#define METROID_CHR_SIZE (0 * 0x2000)
#define METROID_PRG_RAM_SIZE 0x2000
CNESEmulator::CNESEmulator()
{
if (EmulatorConstructed)
Log.report(logvisor::Fatal, "Attempted constructing more than 1 CNESEmulator");
EmulatorConstructed = true;
CDvdFile NESEmuFile("NESemuP.rel");
if (NESEmuFile)
{
m_nesEmuPBuf.reset(new u8[0x20000]);
m_dvdReq = NESEmuFile.AsyncSeekRead(m_nesEmuPBuf.get(), 0x20000, ESeekOrigin::Begin, NESEMUP_ROM_OFFSET);
}
else
{
Log.report(logvisor::Fatal, "Unable to open NESemuP.rel");
}
}
void CNESEmulator::InitializeEmulator()
{
nesPause = false;
ppuDebugPauseFrame = false;
mainClock = 1;
apuClock = 1;
ppuClock = 1;
vrc7Clock = 1;
puts(VERSION_STRING);
strcpy(window_title, VERSION_STRING);
memset(textureImage,0,visibleImg);
emuFileType = FTYPE_UNK;
memset(emuFileName,0,1024);
memset(emuSaveName,0,1024);
nesPAL = METROID_PAL;
uint8_t mapper = METROID_MAPPER;
emuSaveEnabled = METROID_SAVE_ENABLED;
bool trainer = METROID_TRAINER;
uint32_t prgROMsize = METROID_PRG_SIZE;
uint32_t chrROMsize = METROID_CHR_SIZE;
emuPrgRAMsize = METROID_PRG_RAM_SIZE;
emuPrgRAM = (uint8_t*)malloc(emuPrgRAMsize);
uint8_t *prgROM = emuNesROM;
if(trainer)
{
memcpy(emuPrgRAM+0x1000,prgROM,0x200);
prgROM += 512;
}
uint8_t *chrROM = NULL;
if(chrROMsize)
{
chrROM = emuNesROM+prgROMsize;
if(trainer) chrROM += 512;
}
apuInitBufs();
cpuInit();
ppuInit();
memInit();
apuInit();
inputInit();
ppuSetNameTblVertical();
#if DEBUG_LOAD_INFO
printf("Used Mapper: %i\n", mapper);
printf("PRG: 0x%x bytes PRG RAM: 0x%x bytes CHR: 0x%x bytes\n", prgROMsize, emuPrgRAMsize, chrROMsize);
#endif
if(!mapperInit(mapper, prgROM, prgROMsize, emuPrgRAM, emuPrgRAMsize, chrROM, chrROMsize))
{
printf("Mapper init failed!\n");
return;
}
#if DEBUG_LOAD_INFO
printf("Trainer: %i Saving: %i VRAM Mode: Vertical\n", trainer, emuSaveEnabled);
#endif
sprintf(window_title, "%s NES - %s\n", nesPAL ? "PAL" : "NTSC", VERSION_STRING);
sprintf(window_title_pause, "%s (Pause)", window_title);
#if DEBUG_HZ
emuFrameStart = GetTickCount();
#endif
#if DEBUG_MAIN_CALLS
emuMainFrameStart = GetTickCount();
#endif
cpuCycleTimer = nesPAL ? 16 : 12;
//do full frame per update loop
ppuCycleTimer = nesPAL ? 5 : 4;
mainLoopRuns = nesPAL ? DOTS*ppuCycleTimer : DOTS*ppuCycleTimer;
//mainLoopRuns *= ppuLinesTotal;
mainLoopPos = mainLoopRuns;
CGraphics::CommitResources([this](boo::IGraphicsDataFactory::Context& ctx)
{
// Nearest-neighbor FTW!
m_texture = ctx.newDynamicTexture(VISIBLE_DOTS, linesToDraw,
boo::TextureFormat::RGBA8,
boo::TextureClampMode::ClampToEdgeNearest);
Vert verts[4] =
{
{{-1.f, -1.f, 0.f}, {0.f, 1.f}},
{{-1.f, 1.f, 0.f}, {0.f, 0.f}},
{{ 1.f, -1.f, 0.f}, {1.f, 1.f}},
{{ 1.f, 1.f, 0.f}, {1.f, 0.f}},
};
m_vbo = ctx.newStaticBuffer(boo::BufferUse::Vertex, verts, sizeof(Vert), 4);
m_uniBuf = ctx.newDynamicBuffer(boo::BufferUse::Uniform, sizeof(Uniform), 1);
m_shadBind = CNESShader::BuildShaderDataBinding(ctx, m_vbo, m_uniBuf, m_texture);
return true;
});
//double useFreq = 223740;
double useFreq = apuGetFrequency();
m_booVoice = CAudioSys::GetVoiceEngine()->allocateNewStereoVoice(useFreq, this);
m_booVoice->start();
uint32_t apuBufSz = apuGetBufSize();
m_audioBufBlock.reset(new u8[apuBufSz * NUM_AUDIO_BUFFERS]);
for (int i=0 ; i<NUM_AUDIO_BUFFERS ; ++i)
m_audioBufs[i] = m_audioBufBlock.get() + apuBufSz * i;
EmulatorInst = this;
}
void CNESEmulator::DeinitializeEmulator()
{
//printf("\n");
emuRenderFrame = false;
m_booVoice->stop();
m_booVoice.reset();
apuDeinitBufs();
if(emuNesROM != NULL)
{
if(!nesEmuNSFPlayback && fdsEnabled)
{
FILE *save = fopen(emuSaveName, "wb");
if(save)
{
if(emuFdsHasSideB)
fwrite(emuNesROM,1,0x20000,save);
else
fwrite(emuNesROM,1,0x10000,save);
fclose(save);
}
}
}
if(emuPrgRAM != NULL)
{
if(emuSaveEnabled)
{
FILE *save = fopen(emuSaveName, "wb");
if(save)
{
fwrite(emuPrgRAM,1,emuPrgRAMsize,save);
fclose(save);
}
}
free(emuPrgRAM);
}
emuPrgRAM = NULL;
//printf("Bye!\n");
EmulatorInst = nullptr;
}
CNESEmulator::~CNESEmulator()
{
if (EmulatorInst)
DeinitializeEmulator();
if (emuNesROM)
{
free(emuNesROM);
emuNesROM = nullptr;
}
EmulatorConstructed = false;
}
int CNESEmulator::audioUpdate()
{
int origProcBufs = m_procBufs;
uint8_t *data = apuGetBuf();
if(data != NULL && m_procBufs)
{
--m_procBufs;
memmove(m_audioBufs[m_headBuf], data, apuGetBufSize());
//printf("PUSH\n");
++m_headBuf;
if (m_headBuf == NUM_AUDIO_BUFFERS)
m_headBuf = 0;
}
//if (!origProcBufs)
//printf("OVERRUN\n");
return origProcBufs;
}
static constexpr size_t AudioFrameSz = 2 * sizeof(int16_t);
size_t CNESEmulator::supplyAudio(boo::IAudioVoice& voice, size_t frames, int16_t* data)
{
size_t remFrames = frames;
while (remFrames)
{
if (m_posInBuf == apuGetBufSize())
{
++m_tailBuf;
if (m_tailBuf == NUM_AUDIO_BUFFERS)
m_tailBuf = 0;
m_posInBuf = 0;
++m_procBufs;
//printf("POP\n");
}
if (m_procBufs == NUM_AUDIO_BUFFERS)
{
memset(data, 0, remFrames * AudioFrameSz);
//printf("UNDERRUN\n");
return frames;
}
size_t copySz = std::min(apuGetBufSize() - m_posInBuf, remFrames * AudioFrameSz);
memmove(data, m_audioBufs[m_tailBuf] + m_posInBuf, copySz);
data += copySz / sizeof(int16_t);
m_posInBuf += copySz;
remFrames -= copySz / AudioFrameSz;
}
return frames;
}
#define CATCHUP_SKIP 1
#if CATCHUP_SKIP
static int catchupFrames = 0;
#endif
void CNESEmulator::NesEmuMainLoop(bool forceDraw)
{
int start = GetTickCount();
int loopCount = 0;
do
{
if(emuRenderFrame || nesPause)
{
#if DEBUG_MAIN_CALLS
emuMainTimesSkipped++;
#endif
//printf("LC RENDER: %d\n", loopCount);
m_texture->load(textureImage, visibleImg);
emuRenderFrame = false;
#if CATCHUP_SKIP
if (catchupFrames)
--catchupFrames;
else
#endif
break;
}
++loopCount;
if(mainClock == cpuCycleTimer)
{
//URDE uses this loop to pre-fill audio buffers,
//rather than executing multiple frame loops
bool breakout = false;
do
{
//runs every 8th cpu clock
if(apuClock == 8)
{
if(!apuCycleURDE() && !forceDraw)
{
#if DEBUG_MAIN_CALLS
emuMainTimesSkipped++;
#endif
#if CATCHUP_SKIP
catchupFrames = 0;
#endif
//printf("LC SKIP\n");
breakout = true;
break;
}
apuClock = 1;
}
else
apuClock++;
//runs every cpu cycle
apuClockTimers();
} while (emuSkipVsync);
if (breakout)
break;
//main CPU clock
if(!cpuCycle())
exit(EXIT_SUCCESS);
//mapper related irqs
if(mapperCycle != NULL)
mapperCycle();
//mCycles++;
//channel timer updates
apuLenCycle();
mainClock = 1;
}
else
mainClock++;
if(ppuClock == ppuCycleTimer)
{
if(!ppuCycle())
exit(EXIT_SUCCESS);
if(ppuDrawDone())
{
//printf("%i\n",mCycles);
//mCycles = 0;
emuRenderFrame = true;
if(fm2playRunning())
fm2playUpdate();
#if DEBUG_HZ
emuTimesCalled++;
int end = GetTickCount();
emuTotalElapsed += end - emuFrameStart;
if(emuTotalElapsed >= 1000)
{
printf("\r%iHz ", emuTimesCalled);
emuTimesCalled = 0;
emuTotalElapsed = 0;
}
emuFrameStart = end;
#endif
if(ppuDebugPauseFrame)
{
ppuDebugPauseFrame = false;
nesPause = true;
}
if(nesEmuNSFPlayback)
nsfVsync();
}
ppuClock = 1;
}
else
ppuClock++;
if(fdsEnabled)
fdsAudioMasterUpdate();
if(vrc7enabled)
{
if(vrc7Clock == 432)
{
vrc7AudioCycle();
vrc7Clock = 1;
}
else
vrc7Clock++;
}
#if 1
if (!forceDraw && (loopCount % 10000) == 0 && GetTickCount() - start >= 14)
{
#if CATCHUP_SKIP
if (catchupFrames < 50)
++catchupFrames;
#endif
break;
}
#endif
}
while(true);
#if 0
int end = GetTickCount();
printf("%dms %d %d\n", end - start, loopCount, m_procBufs);
#endif
#if DEBUG_MAIN_CALLS
emuMainTimesCalled++;
int end = GetTickCount();
//printf("%dms\n", end - start);
emuMainTotalElapsed += end - emuMainFrameStart;
if(emuMainTotalElapsed >= 1000)
{
printf("\r%i calls, %i skips ", emuMainTimesCalled, emuMainTimesSkipped);
fflush(stdout);
emuMainTimesCalled = 0;
emuMainTimesSkipped = 0;
emuMainTotalElapsed = 0;
}
emuMainFrameStart = end;
#endif
}
static void nesEmuFdsSetup(uint8_t *src, uint8_t *dst)
{
memcpy(dst, src, 0x38);
memcpy(dst+0x3A, src+0x38, 2);
uint16_t cDiskPos = 0x3E;
uint16_t cROMPos = 0x3A;
do
{
if(src[cROMPos] != 0x03)
break;
memcpy(dst+cDiskPos, src+cROMPos, 0x10);
uint16_t copySize = (*(uint16_t*)(src+cROMPos+0xD))+1;
cDiskPos+=0x12;
cROMPos+=0x10;
memcpy(dst+cDiskPos, src+cROMPos, copySize);
cDiskPos+=copySize+2;
cROMPos+=copySize;
} while(cROMPos < 0xFFDC && cDiskPos < 0xFFFF);
printf("%04x -> %04x\n", cROMPos, cDiskPos);
}
void CNESEmulator::DecompressROM(u8* dataIn, u8* dataOut, u32 dataOutLen, u8 descrambleSeed,
u32 checkDataLen, u32 checksumMagic)
{
for (int i=0 ; i<256 ; ++i)
{
descrambleSeed += dataIn[i];
dataIn[i] = descrambleSeed;
}
for (int i=0 ; i<128 ; ++i)
std::swap(dataIn[255 - i], dataIn[i]);
struct BitstreamState
{
u32 x0_remBits = 0;
u32 x4_lastByte;
u8* x8_ptr;
BitstreamState(u8* ptr) : x8_ptr(ptr) {}
} bState = {dataIn + 256};
u8* dataOutAlpha = dataOut;
while (dataOutLen != 0)
{
u32 r12 = 0;
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
u32 r11 = r12 << 1;
if (bState.x4_lastByte & 0x80)
r11 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
if (r11 == 1)
{
r12 = 0;
for (int i=0 ; i<4 ; ++i)
{
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r12 <<= 1;
if (bState.x4_lastByte & 0x80)
r12 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r12 <<= 1;
if (bState.x4_lastByte & 0x80)
r12 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
}
*dataOutAlpha++ = dataIn[r12 + 73];
}
else
{
r12 = 0;
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r11 = r12 << 1;
if (bState.x4_lastByte & 0x80)
r11 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
if (r11 == 1)
{
r12 = 0;
for (int i=0 ; i<3 ; ++i)
{
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r12 <<= 1;
if (bState.x4_lastByte & 0x80)
r12 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r12 <<= 1;
if (bState.x4_lastByte & 0x80)
r12 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
}
*dataOutAlpha++ = dataIn[r12 + 9];
}
else
{
r12 = 0;
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r11 = r12 << 1;
if (bState.x4_lastByte & 0x80)
r11 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
if (r11 == 1)
{
r12 = 0;
for (int i=0 ; i<3 ; ++i)
{
if (bState.x0_remBits == 0)
{
bState.x4_lastByte = *bState.x8_ptr;
bState.x8_ptr += 1;
bState.x0_remBits = 8;
}
r12 <<= 1;
if (bState.x4_lastByte & 0x80)
r12 |= 1;
bState.x4_lastByte <<= 1;
bState.x0_remBits -= 1;
}
*dataOutAlpha++ = dataIn[r12 + 1];
}
else
{
*dataOutAlpha++ = dataIn[0];
}
}
}
--dataOutLen;
}
u32 tmpWord = 0;
for (int i=0 ; i<checkDataLen ; ++i)
{
tmpWord ^= dataOut[i];
for (int j=0 ; j<8 ; ++j)
{
if (tmpWord & 0x1)
tmpWord = (tmpWord >> 1) ^ checksumMagic;
else
tmpWord = (tmpWord >> 1);
}
}
dataOut[checkDataLen - 1] = (tmpWord >> 8) & 0xff;
dataOut[checkDataLen - 2] = tmpWord & 0xff;
}
void CNESEmulator::ProcessUserInput(const CFinalInput& input, int)
{
if (input.ControllerIdx() != 0)
return;
if (GetPasswordEntryState() != EPasswordEntryState::NotPasswordScreen)
{
// Don't swap A/B
inValReads[BUTTON_A] = input.DA();
inValReads[BUTTON_B] = input.DB();
}
else
{
// Prime controls (B jumps, A shoots)
inValReads[BUTTON_B] = input.DA() | input.DY();
inValReads[BUTTON_A] = input.DB() | input.DX();
}
inValReads[BUTTON_UP] = input.DDPUp() | input.DLAUp();
inValReads[BUTTON_DOWN] = input.DDPDown() | input.DLADown();
inValReads[BUTTON_LEFT] = input.DDPLeft() | input.DLALeft();
inValReads[BUTTON_RIGHT] = input.DDPRight() | input.DLARight();
inValReads[BUTTON_SELECT] = input.DZ();
inValReads[BUTTON_START] = input.DStart();
}
bool CNESEmulator::CheckForGameOver(const u8* vram, u8* passwordOut)
{
// "PASS WORD"
if (memcmp(vram + 0x14B, "\x19\xa\x1c\x1c\xff\x20\x18\x1b\xd", 9))
return false;
int chOff = 0;
int encOff = 0;
u8 pwOut[18];
for (int i=0 ; i<24 ; ++i)
{
u8 chName = vram[0x1A9 + chOff];
++chOff;
if (chOff == 0x6 || chOff == 0x46)
++chOff; // mid-line space
else if (chOff == 0xd)
chOff = 64; // 2nd line
if (chName > 0x3f)
return false;
switch (i & 0x3)
{
case 0:
pwOut[encOff] = chName;
break;
case 1:
pwOut[encOff] |= chName << 6;
++encOff;
pwOut[encOff] = chName >> 2;
break;
case 2:
pwOut[encOff] |= chName << 4;
++encOff;
pwOut[encOff] = chName >> 4;
break;
case 3:
pwOut[encOff] |= chName << 2;
++encOff;
break;
default:
break;
}
}
if (passwordOut)
memmove(passwordOut, pwOut, 18);
return true;
}
CNESEmulator::EPasswordEntryState CNESEmulator::CheckForPasswordEntryScreen(const u8* vram)
{
// "PASS WORD PLEASE"
if (memcmp(vram + 0x88, "\x19\xa\x1c\x1c\xff\x20\x18\x1b\xd\xff\x19\x15\xe\xa\x1c\xe", 16))
return EPasswordEntryState::NotPasswordScreen;
for (int i=0 ; i<13 ; ++i)
if (vram[0x109 + i] < 0x40 || vram[0x149 + i] < 0x40)
return EPasswordEntryState::Entered;
return EPasswordEntryState::NotEntered;
}
bool CNESEmulator::SetPasswordIntoEntryScreen(u8* vram, u8* wram, const u8* password)
{
if (CheckForPasswordEntryScreen(vram) != EPasswordEntryState::NotEntered)
return false;
int i;
for (i=0 ; i<18 ; ++i)
if (password[i])
break;
if (i == 18)
return false;
int encOff = 0;
int chOff = 0;
u32 lastWord = 0;
for (i=0 ; i<24 ; ++i)
{
switch (i & 0x3)
{
case 0:
lastWord = password[encOff];
++encOff;
break;
case 1:
lastWord = (lastWord >> 6) | (u32(password[encOff]) << 2);
++encOff;
break;
case 2:
lastWord = (lastWord >> 6) | (u32(password[encOff]) << 4);
++encOff;
break;
case 3:
lastWord = (lastWord >> 6);
break;
default:
break;
}
u8 chName = u8(lastWord & 0x3f);
wram[0x99a + i] = chName;
vram[0x109 + chOff] = chName;
++chOff;
if (chOff == 0x6 || chOff == 0x46)
++chOff; // mid-line space
else if (chOff == 0xd)
chOff = 64; // 2nd line
}
return true;
}
void CNESEmulator::Update()
{
if (!EmulatorInst)
{
if (m_dvdReq && m_dvdReq->IsComplete())
{
m_dvdReq.reset();
emuNesROMsize = 0x20000;
emuNesROM = (uint8_t*)malloc(emuNesROMsize);
DecompressROM(m_nesEmuPBuf.get(), emuNesROM);
m_nesEmuPBuf.reset();
InitializeEmulator();
}
}
else
{
if (nesPause)
{
DeinitializeEmulator();
InitializeEmulator();
return;
}
bool gameOver = CheckForGameOver(ppuGetVRAM(), x21_passwordFromNES);
x34_passwordEntryState = CheckForPasswordEntryScreen(ppuGetVRAM());
if (x34_passwordEntryState == EPasswordEntryState::NotEntered && x38_passwordPending)
{
SetPasswordIntoEntryScreen(ppuGetVRAM(), emuPrgRAM, x39_passwordToNES);
x38_passwordPending = false;
}
if (gameOver && !x20_gameOver)
for (int i=0 ; i<3 ; ++i) // Three draw loops to ensure password display
NesEmuMainLoop(true);
else
NesEmuMainLoop();
x20_gameOver = gameOver;
}
}
static const float NESAspect = VISIBLE_DOTS / float(VISIBLE_LINES);
void CNESEmulator::Draw(const zeus::CColor& mulColor, bool filtering)
{
if (!EmulatorInst)
return;
float aspect = g_Viewport.x8_width / float(g_Viewport.xc_height);
float widthFac = NESAspect / aspect;
Uniform uniform = {zeus::CMatrix4f{}, mulColor};
uniform.m_matrix[0][0] = widthFac;
m_uniBuf->load(&uniform, sizeof(Uniform));
CGraphics::SetShaderDataBinding(m_shadBind);
CGraphics::DrawArray(0, 4);
}
void CNESEmulator::LoadPassword(const u8* state)
{
memmove(x39_passwordToNES, state, 18);
x38_passwordPending = true;
}
}
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