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.include "asm/macros.inc"
.include "global.inc"
.text
arm_func_start ExChannelLfoUpdate
ExChannelLfoUpdate: ; 0x037FC530
stmdb sp!, {r4, r5, r6, lr}
mov r6, r0
mov r5, r1
add r0, r6, #40 ; 0x28
bl SND_GetLfoValue
mov r4, r0
mov ip, r0, asr #31
mov r3, #0
cmp ip, r3
cmpeq r0, r3
beq _037FC5B0
ldrb r1, [r6, #40] ; 0x28
cmp r1, #0
beq _037FC59C
cmp r1, #1
beq _037FC584
cmp r1, #2
moveq ip, ip, lsl #6
orreq ip, ip, r0, lsr #26
moveq r4, r0, lsl #6
b _037FC5A8
_037FC584:
mov r2, #60 ; 0x3c
umull r4, r1, r0, r2
mla r1, r0, r3, r1
mla r1, ip, r2, r1
mov ip, r1
b _037FC5A8
_037FC59C:
mov ip, ip, lsl #6
orr ip, ip, r0, lsr #26
mov r4, r0, lsl #6
_037FC5A8:
mov r4, r4, lsr #14
orr r4, r4, ip, lsl #18
_037FC5B0:
cmp r5, #0
beq _037FC5C0
add r0, r6, #40 ; 0x28
bl SND_UpdateLfo
_037FC5C0:
mov r0, r4
ldmia sp!, {r4, r5, r6, lr}
bx lr
arm_func_start ExChannelSweepUpdate
ExChannelSweepUpdate: ; 0x037FC5CC
stmdb sp!, {r4, r5, lr}
sub sp, sp, #4
mov r4, r0
mov r5, r1
ldrsh r3, [r4, #50] ; 0x32
cmp r3, #0
moveq r0, #0
beq _037FC630
ldr r0, [r4, #20]
ldr r2, [r4, #24]
cmp r0, r2
movge r0, #0
bge _037FC630
sub r0, r2, r0
smull r0, r1, r3, r0
mov r3, r2, asr #31
bl _ll_sdiv
cmp r5, #0
beq _037FC630
ldrb r1, [r4, #3]
mov r1, r1, lsl #29
movs r1, r1, lsr #31
ldrne r1, [r4, #20]
addne r1, r1, #1
strne r1, [r4, #20]
_037FC630:
add sp, sp, #4
ldmia sp!, {r4, r5, lr}
bx lr
arm_func_start ExChannelVolumeCmp
ExChannelVolumeCmp: ; 0x037FC63C
stmfd sp!, {lr}
sub sp, sp, #4
ldrh lr, [r0, #36] ; 0x24
and r2, lr, #255 ; 0xff
ldrh ip, [r1, #36] ; 0x24
and r0, ip, #255 ; 0xff
mov r2, r2, lsl #4
mov r3, r0, lsl #4
ldr r1, _037FC698 ; =sSampleDataShiftTable
ldrb r0, [r1, lr, asr #8]
mov r2, r2, asr r0
ldrb r0, [r1, ip, asr #8]
mov r0, r3, asr r0
cmp r2, r0
beq _037FC688
cmp r2, r0
movlt r0, #1
mvnge r0, #0
b _037FC68C
_037FC688:
mov r0, #0
_037FC68C:
add sp, sp, #4
ldmia sp!, {lr}
bx lr
_037FC698: .word sSampleDataShiftTable
arm_func_start ExChannelStart
ExChannelStart: ; 0x037FC69C
stmdb sp!, {r4, lr}
mov r4, r0
ldr r0, _037FC6E4 ; =0xFFFE9680
str r0, [r4, #16]
mov r0, #0
strb r0, [r4, #2]
str r1, [r4, #52] ; 0x34
add r0, r4, #40 ; 0x28
bl SND_StartLfo
ldrb r0, [r4, #3]
orr r0, r0, #2
strb r0, [r4, #3]
ldrb r0, [r4, #3]
bic r0, r0, #1
orr r0, r0, #1
strb r0, [r4, #3]
ldmia sp!, {r4, lr}
bx lr
_037FC6E4: .word 0xFFFE9680
arm_func_start ExChannelSetup
ExChannelSetup: ; 0x037FC6E8
stmdb sp!, {r4, lr}
mov r4, r0
mov ip, #0
str ip, [r4, #80] ; 0x50
str r1, [r4, #72] ; 0x48
str r2, [r4, #76] ; 0x4c
str ip, [r4, #52] ; 0x34
strb r3, [r4, #34] ; 0x22
mov r1, #127 ; 0x7f
strh r1, [r4, #36] ; 0x24
ldrb r2, [r4, #3]
bic r2, r2, #2
strb r2, [r4, #3]
ldrb r2, [r4, #3]
orr r2, r2, #4
strb r2, [r4, #3]
mov r2, #60 ; 0x3c
strb r2, [r4, #8]
strb r2, [r4, #5]
strb r1, [r4, #9]
strb ip, [r4, #10]
strh ip, [r4, #12]
strh ip, [r4, #6]
strh ip, [r4, #14]
strb ip, [r4, #11]
strb r1, [r4, #4]
strh ip, [r4, #50] ; 0x32
str ip, [r4, #24]
str ip, [r4, #20]
bl SND_SetExChannelAttack
mov r0, r4
mov r1, #127 ; 0x7f
bl SND_SetExChannelDecay
mov r0, r4
mov r1, #127 ; 0x7f
bl SND_SetExChannelSustain
mov r0, r4
mov r1, #127 ; 0x7f
bl SND_SetExChannelRelease
add r0, r4, #40 ; 0x28
bl SND_InitLfoParam
ldmia sp!, {r4, lr}
bx lr
arm_func_start CalcDecayCoeff
CalcDecayCoeff: ; 0x037FC794
stmfd sp!, {lr}
sub sp, sp, #4
mov r1, r0
cmp r1, #127 ; 0x7f
ldreq r0, _037FC7F0 ; =0x0000FFFF
beq _037FC7E4
cmp r1, #126 ; 0x7e
moveq r0, #15360 ; 0x3c00
beq _037FC7E4
cmp r1, #50 ; 0x32
movlt r0, r1, lsl #1
addlt r0, r0, #1
movlt r0, r0, lsl #16
movlt r0, r0, lsr #16
blt _037FC7E4
mov r0, #7680 ; 0x1e00
rsb r1, r1, #126 ; 0x7e
bl _s32_div_f
mov r0, r0, lsl #16
mov r0, r0, lsr #16
_037FC7E4:
add sp, sp, #4
ldmia sp!, {lr}
bx lr
_037FC7F0: .word 0x0000FFFF
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