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| author | Michael Forney <mforney@mforney.org> | 2021-02-08 04:58:49 +0100 |
|---|---|---|
| committer | Michael Forney <mforney@mforney.org> | 2021-02-08 04:58:49 +0100 |
| commit | 415c110b284bdd519e6dedcfea97e45edcb8977a (patch) | |
| tree | 927c32f113881845127ed52adddcd1206f52160a | |
| parent | e502abe001306ad8c95ea5b32a437c53d90eccfa (diff) | |
| download | plan9front-415c110b284bdd519e6dedcfea97e45edcb8977a.tar.xz | |
games/gb: fix reversed audio channels
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.
| -rw-r--r-- | sys/src/games/gb/apu.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/src/games/gb/apu.c b/sys/src/games/gb/apu.c index 900f7e793..e0862ebdf 100644 --- a/sys/src/games/gb/apu.c +++ b/sys/src/games/gb/apu.c @@ -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 |