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Add support for ugetab's GBS extensions, fixes #377

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This commit is contained in:
Lior Halphon 2021-04-19 00:32:10 +03:00
parent 5f2e893828
commit 2971b17701
1 changed files with 7 additions and 2 deletions
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9
Core/gb.c
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@ -333,6 +333,9 @@ void GB_gbs_switch_track(GB_gameboy_t *gb, uint8_t track)
gb->sgb->intro_animation = GB_SGB_INTRO_ANIMATION_LENGTH;
gb->sgb->disable_commands = true;
}
if (gb->gbs_header.TAC & 0x40) {
gb->interrupt_enable = true;
}
}
int GB_load_gbs(GB_gameboy_t *gb, const char *path, GB_gbs_info_t *info)
@ -384,13 +387,15 @@ int GB_load_gbs(GB_gameboy_t *gb, const char *path, GB_gbs_info_t *info)
memset(gb->mbc_ram, 0xFF, gb->mbc_ram_size);
}
bool has_interrupts = gb->gbs_header.TAC & 0x40;
// Generate interrupt handlers
for (unsigned i = 0; i <= 0x38; i += 8) {
for (unsigned i = 0; i <= (has_interrupts? 0x50 : 0x38); i += 8) {
gb->rom[i] = 0xc3; // jp $XXXX
gb->rom[i + 1] = (LE16(gb->gbs_header.load_address) + i);
gb->rom[i + 2] = (LE16(gb->gbs_header.load_address) + i) >> 8;
}
for (unsigned i = 0x40; i <= 0x60; i += 8) {
for (unsigned i = has_interrupts? 0x58 : 0x40; i <= 0x60; i += 8) {
gb->rom[i] = 0xc9; // ret
}