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Improved emulation of joypad switching delay

This commit is contained in:
Lior Halphon 2023-02-11 20:21:24 +02:00
parent 59ecd4b9bc
commit 8dd5e6d9b8
1 changed files with 20 additions and 4 deletions
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24
Core/memory.c
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@ -1527,14 +1527,30 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
GB_update_joyp(gb);
}
else if ((gb->io_registers[GB_IO_JOYP] & 0x30) != (value & 0x30)) {
if (gb->model < GB_MODEL_SGB) { // DMG only
if (!GB_is_cgb(gb) && !GB_is_sgb(gb)) {
if (gb->joyp_switching_delay) {
gb->io_registers[GB_IO_JOYP] = (gb->joyp_switch_value & 0xF0) | (gb->io_registers[GB_IO_JOYP] & 0x0F);
}
gb->joyp_switch_value = value;
gb->joyp_switching_delay = 24;
value &= gb->io_registers[GB_IO_JOYP];
gb->joypad_is_stable = false;
uint8_t delay = 0;
switch (((gb->io_registers[GB_IO_JOYP] & 0x30) >> 4) |
((value & 0x30) >> 2)) {
case 0x4: delay = 48; break;
case 0x6: delay = gb->model == GB_MODEL_MGB? 56 : 48; break;
case 0x8: delay = 24; break;
case 0x9: delay = 24; break;
case 0xC: delay = 48; break;
case 0xD: delay = 24; break;
case 0xE: delay = 48; break;
}
if (delay && gb->model == GB_MODEL_MGB) {
delay -= 16;
}
if (delay) {
gb->joyp_switching_delay = MAX(gb->joyp_switching_delay, delay);
value &= gb->io_registers[GB_IO_JOYP];
gb->joypad_is_stable = false;
}
}
GB_sgb_write(gb, value);
gb->io_registers[GB_IO_JOYP] = (value & 0xF0) | (gb->io_registers[GB_IO_JOYP] & 0x0F);