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m269: Move chr unscrambling to mapper init

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negativeExponent
2020-03-17 21:04:06 +08:00
parent 1788955a90
commit ebcb4e66d9
1 changed files with 13 additions and 11 deletions
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24
src/boards/269.c
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@@ -67,25 +67,19 @@ static void M269Reset(void) {
}
static void M269Power(void) {
uint32 i;
EXPREGS[0] = EXPREGS[1] = EXPREGS[3] = EXPREGS[4] = 0;
EXPREGS[2] = 0x0F;
GenMMC3Power();
SetWriteHandler(0x5000, 0x5FFF, M269Write5);
}
CHRROMSIZE = PRGsize[0];
CHRROM = (uint8*)FCEU_gmalloc(CHRROMSIZE);
/* Decrypt CHR data */
for (i = 0; i < CHRROMSIZE; i++) {
uint8_t Val = PRGptr[0][i];
Val = ((Val & 1) << 6) | ((Val & 2) << 3) | ((Val & 4) << 0) | ((Val & 8) >> 3) | ((Val & 16) >> 3) | ((Val & 32) >> 2) | ((Val & 64) >> 1) | ((Val & 128) << 0);
CHRROM[i] = Val;
}
SetupCartCHRMapping(0, CHRROM, CHRROMSIZE, 0);
AddExState(CHRROM, CHRROMSIZE, 0, "_CHR");
static uint8 unscrambleCHR(uint8 data) {
return ((data & 0x01) << 6) | ((data & 0x02) << 3) | ((data & 0x04) << 0) | ((data & 0x08) >> 3) |
((data & 0x10) >> 3) | ((data & 0x20) >> 2) | ((data & 0x40) >> 1) | ((data & 0x80) << 0);
}
void Mapper269_Init(CartInfo *info) {
int i;
GenMMC3_Init(info, 512, 0, 8, 0);
cwrap = M269CW;
pwrap = M269PW;
@@ -93,4 +87,12 @@ void Mapper269_Init(CartInfo *info) {
info->Reset = M269Reset;
info->Close = M269Close;
AddExState(EXPREGS, 5, 0, "EXPR");
CHRROMSIZE = PRGsize[0];
CHRROM = (uint8*)FCEU_gmalloc(CHRROMSIZE);
/* unscramble CHR data from PRG */
for (i = 0; i < CHRROMSIZE; i++)
CHRROM[i] = unscrambleCHR(PRGptr[0][i]);
SetupCartCHRMapping(0, CHRROM, CHRROMSIZE, 0);
AddExState(CHRROM, CHRROMSIZE, 0, "_CHR");
}