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This commit is contained in:
Gwilym Kuiper 2022-05-04 16:59:17 +01:00
parent 73b8530240
commit 0229b95d7c
1 changed files with 10 additions and 10 deletions
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20
agb/src/sound/mixer/mixer.s
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@ -151,6 +151,15 @@ agb_arm_func agb_rs__mixer_add_stereo
agb_arm_end agb_rs__mixer_add_stereo agb_arm_end agb_rs__mixer_add_stereo
agb_arm_func agb_rs__mixer_collapse
@ Arguments:
@ r0 = target buffer (i8)
@ r1 = input buffer (i16) of fixnums with 4 bits of precision (read in sets of i16 in an i32)
push {r4, r5, r6}
ldr r2, agb_rs__buffer_size @ loop counter
mov r4, r2
.macro clamp_s8 reg:req .macro clamp_s8 reg:req
cmn \reg, #128 cmn \reg, #128
mvnlt \reg, #128 mvnlt \reg, #128
@ -161,16 +170,6 @@ agb_arm_end agb_rs__mixer_add_stereo
and \reg, \reg, #255 and \reg, \reg, #255
.endm .endm
agb_arm_func agb_rs__mixer_collapse
@ Arguments:
@ r0 = target buffer (i8)
@ r1 = input buffer (i16) of fixnums with 4 bits of precision (read in sets of i16 in an i32)
push {r4, r5, r6}
ldr r2, agb_rs__buffer_size @ loop counter
mov r4, r2
1:
.macro load_sample left_reg:req right_reg:req .macro load_sample left_reg:req right_reg:req
@ left_reg = *r1; r1++ @ left_reg = *r1; r1++
ldr \left_reg, [r1], #4 ldr \left_reg, [r1], #4
@ -183,6 +182,7 @@ agb_arm_func agb_rs__mixer_collapse
clamp_s8 \right_reg clamp_s8 \right_reg
.endm .endm
1:
load_sample r3, r12 load_sample r3, r12
load_sample r5, r6 load_sample r5, r6