diff options
| -rw-r--r-- | audio/engine.asm | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/audio/engine.asm b/audio/engine.asm index 9c1189eaf..103f08530 100644 --- a/audio/engine.asm +++ b/audio/engine.asm @@ -1060,27 +1060,28 @@ ReadNoiseSample: ; e85af ; sample struct: ; [wx] [yy] [zz] ; w: ? either 2 or 3 -; x: ? 0-7 -; zzyy: pointer to sample data -; NOTE: these seem to have $4000 added to them later +; x: duration +; zz: intensity +; yy: frequency - ; de = NoiseSampleAddress + ; de = [NoiseSampleAddress] ld hl, NoiseSampleAddress ld e, [hl] inc hl ld d, [hl] + ; is it empty? ld a, e or d jr z, .quit - ; get the noise sample + ld a, [de] inc de - ; are we done? - cp a, $ff + + cp $ff jr z, .quit - ; - and a, $0f ; bottom nybble + + and $f inc a ld [$c2a2], a ld a, [de] @@ -1091,11 +1092,12 @@ ReadNoiseSample: ; e85af ld [$c294], a xor a ld [$c295], a - ; + ld hl, NoiseSampleAddress ld [hl], e inc hl ld [hl], d + ld hl, Channel1NoteFlags - Channel1 add hl, bc set 4, [hl] |