void replay_init(REPLAY *rep)
{
// init replay mode
strcpy(rep->fname, getenv("TEMP"));
strcat(rep->fname, "\\lastreplay");
rep->mode = NES_REPLAY_RECORD;
replay_reset(rep); // reset replay
}
// 内部函数实现
static void nes_do_reset(NES *nes)
{
// mmc need reset first
mmc_reset(&(nes->mmc));
// reset cpu & ppu & apu
cpu_reset(&(nes->cpu));
ppu_reset(&(nes->ppu));
apu_reset(&(nes->apu));
// reset joypad
joypad_reset(&(nes->pad));
// reset replay
replay_reset(&(nes->replay));
// restart ndb
ndb_set_debug(&(nes->ndb), NDB_DEBUG_MODE_RESTART);
}
int nes_load_game(NES *nes, char *file)
{
NES_SAVE_FILE save;
void *fp;
NES buf;
int start, end, i;
int oldapuaclk;
int newapuaclk;
int running;
int length;
// protected member list
static int plist[][2] =
{
{ offsetof(NES, cpu.cbus ), sizeof(BUS ) },
{ offsetof(NES, ppu.vdev ), sizeof(VDEV* ) },
{ offsetof(NES, ppu.vctxt ), sizeof(void* ) },
{ offsetof(NES, apu.adev ), sizeof(ADEV* ) },
{ offsetof(NES, apu.actxt ), sizeof(void* ) },
{ offsetof(NES, mmc.cart ), sizeof(CARTRIDGE*) },
{ offsetof(NES, mmc.cbus ), sizeof(BUS ) },
{ offsetof(NES, mmc.pbus ), sizeof(BUS ) },
{ offsetof(NES, cart ), sizeof(CARTRIDGE ) },
{ offsetof(NES, extra ), sizeof(DWORD ) },
{ offsetof(NES, cbus ), (offsetof(NES, ndb) - offsetof(NES, cbus)) },
{ offsetof(NES, ndb.nes ), sizeof(NES* ) },
{ sizeof(NES) , 0 },
};
// open save file
fp = fopen(file, "rb");
if (!fp) return 0;
// pause nes thread if running
running = nes_getrun(nes);
if (running) nes_setrun(nes, 0);
// read .sav file header
fread(&save, sizeof(save), 1, fp);
length = save.head_size + save.neso_size + save.sram_size + save.cram_size;
if (save.neso_size) {
fseek(fp, save.head_size, SEEK_SET);
fread(&buf, sizeof(buf), 1, fp);
}
if (save.sram_size && cartridge_has_sram(&nes->cart)) {
fseek(fp, save.head_size + save.neso_size, SEEK_SET);
fread(nes->cart.buf_sram, 0x2000, 1, fp);
}
if (save.cram_size && nes->cart.ischrram) {
fseek(fp, save.head_size + save.neso_size + save.sram_size, SEEK_SET);
fread(nes->cart.buf_crxm, nes->cart.crom_count * 0x2000, 1, fp);
}
// get ppu & apu old/new pclk
oldapuaclk = nes->apu.aclk_counter;
newapuaclk = buf. apu.aclk_counter;
//++ restore nes context data from save file data ++//
i = start = 0;
do {
end = plist[i][0];
memcpy((BYTE*)nes + start, (BYTE*)&buf + start, end - start);
start = end;
start += plist[i][1];
} while (plist[i++][1]);
//-- restore nes context data from save file data --//
// restore ppu & mmc
restore_apu(&nes->apu, oldapuaclk, newapuaclk);
restore_ppu(&nes->ppu);
restore_mmc(&nes->mmc);
// reset replay if record modes
if (nes->replay.mode == NES_REPLAY_RECORD) {
replay_reset(&nes->replay);
}
// resume running
if (running) nes_setrun(nes, 1);
// close save file
fclose(fp);
return length;
}
