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games/gb: fix reversed audio channels

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The high bits correspond to the left channel, and the low bits to the
right channel.

Reference: https://gbdev.io/pandocs/#sound-control-registers

Tested with pokemon crystal.
This commit is contained in:
Michael Forney 2021-02-08 04:58:49 +01:00
parent e502abe001
commit 415c110b28
1 changed files with 4 additions and 4 deletions
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8
sys/src/games/gb/apu.c
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@ -115,13 +115,13 @@ filter(int t)
if(i == 2 ? ((reg[NR30] & 0x80) == 0) : ((*sndch[i].env & 0xf8) == 0))
continue;
v = sndch[i].samp * 2 - 15;
if((cnth & 1<<i) != 0)
ov0 += v;
if((cnth & 1<<4<<i) != 0)
ov0 += v;
if((cnth & 1<<i) != 0)
ov1 += v;
}
ov0 *= 1 + (cntl & 7);
ov1 *= 1 + (cntl >> 4 & 7);
ov0 *= 1 + (cntl >> 4 & 7);
ov1 *= 1 + (cntl & 7);
}
static void