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Randomize everything!

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This commit is contained in:
Lior Halphon 2019-06-09 18:14:32 +03:00
parent 8b1c165253
commit 843683a492
1 changed files with 81 additions and 0 deletions
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81
Core/gb.c
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@ -602,6 +602,87 @@ static void reset_ram(GB_gameboy_t *gb)
break;
}
/* HRAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
// case GB_MODEL_CGB_D:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
for (unsigned i = 0; i < sizeof(gb->hram); i++) {
gb->hram[i] = (random() & 0xFF);
}
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB2:
for (unsigned i = 0; i < sizeof(gb->hram); i++) {
if (i & 1) {
gb->hram[i] = random() | random() | random();
}
else {
gb->hram[i] = random() & random() & random();
}
}
break;
}
/* OAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Zero'd out by boot ROM anyway*/
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB2:
for (unsigned i = 0; i < 8; i++) {
if (i & 2) {
gb->oam[i] = random() & random() & random();
}
else {
gb->oam[i] = random() | random() | random();
}
}
for (unsigned i = 8; i < sizeof(gb->oam); i++) {
gb->oam[i] = gb->oam[i - 8];
}
break;
}
/* Wave RAM */
switch (gb->model) {
case GB_MODEL_CGB_C:
case GB_MODEL_CGB_E:
case GB_MODEL_AGB:
/* Initialized by CGB-A and newer, 0s in CGB-0*/
break;
case GB_MODEL_DMG_B:
case GB_MODEL_SGB_NTSC: /* Unverified*/
case GB_MODEL_SGB_PAL: /* Unverified */
case GB_MODEL_SGB2: {
uint8_t temp;
for (unsigned i = 0; i < GB_IO_WAV_END - GB_IO_WAV_START; i++) {
if (i & 1) {
temp = random() & random() & random();
}
else {
temp = random() | random() | random();
}
gb->apu.wave_channel.wave_form[i * 2] = temp >> 4;
gb->apu.wave_channel.wave_form[i * 2 + 1] = temp & 0xF;
gb->io_registers[GB_IO_WAV_START + i] = temp;
}
break;
}
}
for (unsigned i = 0; i < sizeof(gb->extra_oam); i++) {
gb->extra_oam[i] = (random() & 0xFF);
}