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Add an API to allow illegal inputs

This commit is contained in:
Lior Halphon 2021-12-19 00:28:24 +02:00
parent eaccd792ed
commit cdc3321c36
3 changed files with 14 additions and 5 deletions
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1
Core/gb.h
View File

@ -657,6 +657,7 @@ struct GB_gameboy_internal_s {
bool objects_disabled;
bool background_disabled;
bool joyp_accessed;
bool illegal_inputs_allowed;
/* Timing */
uint64_t last_sync;

17
Core/joypad.c
View File

@ -30,11 +30,13 @@ void GB_update_joyp(GB_gameboy_t *gb)
gb->io_registers[GB_IO_JOYP] |= (!gb->keys[current_player][i]) << i;
}
/* Forbid pressing two opposing keys, this breaks a lot of games; even if it's somewhat possible. */
if (!(gb->io_registers[GB_IO_JOYP] & 1)) {
gb->io_registers[GB_IO_JOYP] |= 2;
}
if (!(gb->io_registers[GB_IO_JOYP] & 4)) {
gb->io_registers[GB_IO_JOYP] |= 8;
if (likely(!gb->illegal_inputs_allowed)) {
if (!(gb->io_registers[GB_IO_JOYP] & 1)) {
gb->io_registers[GB_IO_JOYP] |= 2;
}
if (!(gb->io_registers[GB_IO_JOYP] & 4)) {
gb->io_registers[GB_IO_JOYP] |= 8;
}
}
break;
@ -131,3 +133,8 @@ void GB_clear_joyp_accessed(GB_gameboy_t *gb)
{
gb->joyp_accessed = false;
}
void GB_set_allow_illegal_inputs(GB_gameboy_t *gb, bool allow)
{
gb->illegal_inputs_allowed = allow;
}

1
Core/joypad.h
View File

@ -36,6 +36,7 @@ void GB_set_key_mask_for_player(GB_gameboy_t *gb, GB_key_mask_t mask, unsigned p
void GB_icd_set_joyp(GB_gameboy_t *gb, uint8_t value);
bool GB_get_joyp_accessed(GB_gameboy_t *gb);
void GB_clear_joyp_accessed(GB_gameboy_t *gb);
void GB_set_allow_illegal_inputs(GB_gameboy_t *gb, bool allow);
#ifdef GB_INTERNAL