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Calculate 127 + sample earlier

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This commit is contained in:
Gwilym Kuiper 2022-05-04 18:05:54 +01:00
parent 3fea9aada0
commit b02cdd9233
1 changed files with 2 additions and 3 deletions
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5
agb/src/sound/mixer/mixer.s
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@ -170,7 +170,6 @@ TEMP .req r10
mov r4, r2
.macro clamp_s8 reg:req
add \reg, \reg, #127
subs r10, r7, \reg, asr #8
andne \reg, r8, r10, lsr #24
.endm
@ -180,8 +179,8 @@ TEMP .req r10
ldr \left_reg, [r1], #4
lsl \right_reg, \left_reg, #16 @ push the sample 16 bits first
asr \right_reg, \right_reg, #20 @ move right sample back to being the correct value
mov \left_reg, \left_reg, asr #20 @ now we only have the left sample
add \right_reg, r9, \right_reg, asr #20 @ move right sample back to being the correct value
add \left_reg, r9, \left_reg, asr #20 @ now we only have the left sample
clamp_s8 \left_reg @ clamp the audio to 8 bit values
clamp_s8 \right_reg