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GB: Copy logo from ROM if not running the BIOS intro (fixes #2378)

This commit is contained in:
Vicki Pfau 2022-02-07 04:02:37 -08:00
parent 4d648c4f7c
commit 6c84f43c22
2 changed files with 48 additions and 0 deletions
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1
CHANGES
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@ -16,6 +16,7 @@ Features:
- New unlicensed GB mappers: NT (newer type)
Emulation fixes:
- ARM7: Fix unsigned multiply timing
- GB: Copy logo from ROM if not running the BIOS intro (fixes mgba.io/i/2378)
- GB Memory: Add cursory cartridge open bus emulation (fixes mgba.io/i/2032)
- GB Serialize: Fix loading MBC1 states that affect bank 0 (fixes mgba.io/i/2402)
- GB Video: Draw SGB border pieces that overlap GB graphics (fixes mgba.io/i/1339)

47
src/gb/gb.c
View File

@ -587,6 +587,53 @@ void GBSkipBIOS(struct GB* gb) {
break;
}
unsigned i;
for (i = 0; i < sizeof(cart->logo); ++i) {
uint8_t byte = GBLoad8(cpu, 0x104 + i);
uint8_t output0 = 0;
uint8_t output1 = 0;
output0 |= (byte & 0x80) >> 0;
output0 |= (byte & 0x40) >> 1;
output0 |= (byte & 0x20) >> 2;
output0 |= (byte & 0x10) >> 3;
output0 |= output0 >> 1;
output1 |= (byte & 0x08) << 3;
output1 |= (byte & 0x04) << 2;
output1 |= (byte & 0x02) << 1;
output1 |= (byte & 0x01) << 0;
output1 |= output1 << 1;
if (gb->model < GB_MODEL_CGB) {
GBPatch8(cpu, 0x8010 + i * 8, output0, NULL, 0);
GBPatch8(cpu, 0x8012 + i * 8, output0, NULL, 0);
GBPatch8(cpu, 0x8014 + i * 8, output1, NULL, 0);
GBPatch8(cpu, 0x8016 + i * 8, output1, NULL, 0);
} else {
GBPatch8(cpu, 0x8380 + i * 2, output0, NULL, 0);
GBPatch8(cpu, 0x8381 + i * 2, output1, NULL, 0);
}
}
if (gb->model < GB_MODEL_CGB) {
for (i = 0; i < 12; ++i) {
GBPatch8(cpu, 0x9904 + i, i + 1, NULL, 0);
GBPatch8(cpu, 0x9924 + i, i + 13, NULL, 0);
}
GBPatch8(cpu, 0x9910, 0x19, NULL, 0);
for (i = 0; i < sizeof(_registeredTrademark); ++i) {
GBPatch8(cpu, 0x8191 + i * 2, _registeredTrademark[i], NULL, 0);
}
} else {
for (i = 0; i < 7; ++i) {
GBPatch8(cpu, 0x99A7 + i, i + 0x38, NULL, 0);
}
for (i = 0; i < sizeof(_registeredTrademark); ++i) {
GBPatch8(cpu, 0x83E1 + i * 2, _registeredTrademark[i], NULL, 0);
}
}
cpu->sp = 0xFFFE;
cpu->pc = 0x100;