1 files changed, 39 insertions, 0 deletions
diff --git a/arm9/asm/SND_util.s b/arm9/asm/SND_util.s
new file mode 100644
index 00000000..8a35db45
--- /dev/null
+++ b/arm9/asm/SND_util.s
@@ -0,0 +1,39 @@
+	.include "asm/macros.inc"
+	.include "global.inc"
+
+    .text
+
+	arm_func_start SND_CalcChannelVolume
+SND_CalcChannelVolume: ; 0x020CF6F4
+	ldr r1, _020CF75C ; =0xFFFFFD2D
+	cmp r0, r1
+	movlt r0, r1
+	blt _020CF70C
+	cmp r0, #0x0
+	movgt r0, #0x0
+_020CF70C:
+	ldr r1, _020CF760 ; =0x000002D3
+	ldr r2, _020CF764 ; =0x02103CAC
+	add r3, r0, r1
+	mvn r1, #0xef
+	cmp r0, r1
+	ldrb r2, [r2, r3]
+	movlt r0, #0x3
+	blt _020CF74C
+	mvn r1, #0x77
+	cmp r0, r1
+	movlt r0, #0x2
+	blt _020CF74C
+	mvn r1, #0x3b
+	cmp r0, r1
+	movlt r0, #0x1
+	movge r0, #0x0
+_020CF74C:
+	orr r0, r2, r0, lsl #0x8
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	bx lr
+	.balign 4
+_020CF75C: .word 0xFFFFFD2D
+_020CF760: .word 0x000002D3
+_020CF764: .word 0x02103CAC