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port cgb fakematching fixes (thanks to revo)

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This commit is contained in:
Kurausukun 2021-08-08 20:33:21 -04:00
parent 0e33df21b9
commit b51d025f1c
1 changed files with 3 additions and 3 deletions
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6
src/m4a.c
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@ -906,7 +906,6 @@ void CgbSound(void)
{
s32 ch;
struct CgbChannel *channels;
s32 envelopeStepTimeAndDir;
s32 prevC15;
struct SoundInfo *soundInfo = SOUND_INFO_PTR;
vu8 *nrx0ptr;
@ -914,6 +913,7 @@ void CgbSound(void)
vu8 *nrx2ptr;
vu8 *nrx3ptr;
vu8 *nrx4ptr;
s32 envelopeStepTimeAndDir;
// Most comparision operations that cast to s8 perform 'and' by 0xFF.
int mask = 0xff;
@ -1198,8 +1198,8 @@ void CgbSound(void)
}
else
{
envelopeStepTimeAndDir &= 0xf;
*nrx2ptr = (channels->envelopeVolume << 4) + envelopeStepTimeAndDir;
unsigned int newMask = 0xF;
*nrx2ptr = (envelopeStepTimeAndDir & newMask) + (channels->envelopeVolume << 4);
*nrx4ptr = channels->n4 | 0x80;
if (ch == 1 && !(*nrx0ptr & 0x08))
*nrx4ptr = channels->n4 | 0x80;