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Update comments now I understand what's happening

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This commit is contained in:
Gwilym Kuiper 2021-08-01 20:50:52 +01:00
parent 451f38604d
commit 18d96e4349
1 changed files with 2 additions and 2 deletions
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4
agb/src/sound/mixer/mixer.s
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@ -32,9 +32,9 @@ agb_rs__mixer_add:
ldrh r9, [r6, r12]! @ load the current buffer value (r12 being the offset) but pre-increment r6 by r12 ldrh r9, [r6, r12]! @ load the current buffer value (r12 being the offset) but pre-increment r6 by r12
mla r7, r10, r3, r9 @ r7 = r10 * r3 + r9 = current sound value * left amount + previous buffer value mla r7, r10, r3, r9 @ r7 = r10 * r3 + r9 = current sound value * left amount + previous buffer value
strh r7, [r6], r8 @ *(r6 + r8) = r7, r8 = 352 = offset for the right hand side strh r7, [r6], r8 @ *r6 = r7, r6 += r8 where r8 = 352 = offset for the right hand side
ldrh r7, [r6] @ same for the right hand side (slightly confused here, but this is what was generated) ldrh r7, [r6] @ same for the right hand side, r6 now points to the right hand side location
mla r4, r10, lr, r7 mla r4, r10, lr, r7
strh r4, [r6] strh r4, [r6]