1 files changed, 201 insertions, 0 deletions
diff --git a/arm9/asm/FX_atan.s b/arm9/asm/FX_atan.s
new file mode 100644
index 00000000..232a7211
--- /dev/null
+++ b/arm9/asm/FX_atan.s
@@ -0,0 +1,201 @@
+    .include "asm/macros.inc"
+    .include "global.inc"
+
+    .text
+
+	arm_func_start FX_Atan2
+FX_Atan2: ; 0x020C5668
+	stmdb sp!, {r4,lr}
+	cmp r0, #0x0
+	ble _020C5704
+	cmp r1, #0x0
+	ble _020C56B4
+	cmp r1, r0
+	movgt r3, r0
+	movgt r4, #0x0
+	movgt r0, #0x1
+	bgt _020C57C8
+	cmp r1, r0
+	movlt r3, r1
+	movlt r1, r0
+	movlt r4, #0x4000
+	movlt r0, #0x0
+	blt _020C57C8
+	mov r0, #0x2000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C56B4:
+	cmp r1, #0x0
+	bge _020C56F8
+	rsb r1, r1, #0x0
+	cmp r1, r0
+	movlt r3, r1
+	movlt r1, r0
+	movlt r4, #0x4000
+	movlt r0, #0x1
+	blt _020C57C8
+	cmp r1, r0
+	movgt r3, r0
+	movgt r4, #0x8000
+	movgt r0, #0x0
+	bgt _020C57C8
+	mov r0, #0x6000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C56F8:
+	mov r0, #0x4000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C5704:
+	cmp r0, #0x0
+	bge _020C57B4
+	cmp r1, #0x0
+	rsb r2, r0, #0x0
+	bge _020C5760
+	rsb r1, r1, #0x0
+	cmp r1, r2
+	movgt r0, #0x8000
+	rsbgt r4, r0, #0x0
+	movgt r3, r2
+	movgt r0, #0x1
+	bgt _020C57C8
+	cmp r1, r2
+	bge _020C5754
+	mov r0, #0x4000
+	mov r3, r1
+	mov r1, r2
+	rsb r4, r0, #0x0
+	mov r0, #0x0
+	b _020C57C8
+_020C5754:
+	mov r0, #0xa000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C5760:
+	cmp r1, #0x0
+	ble _020C57A8
+	cmp r1, r2
+	bge _020C5788
+	mov r0, #0x4000
+	mov r3, r1
+	mov r1, r2
+	rsb r4, r0, #0x0
+	mov r0, #0x1
+	b _020C57C8
+_020C5788:
+	cmp r1, r2
+	movgt r4, #0x0
+	movgt r3, r2
+	movgt r0, r4
+	bgt _020C57C8
+	mov r0, #0xe000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C57A8:
+	mov r0, #0xc000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C57B4:
+	cmp r1, #0x0
+	movge r0, #0x0
+	movlt r0, #0x8000
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C57C8:
+	cmp r1, #0x0
+	moveq r0, #0x0
+	ldmeqia sp!, {r4,lr}
+	bxeq lr
+	cmp r0, #0x0
+	beq _020C580C
+	mov r0, r3
+	bl FX_Div
+	mov r1, r0, asr #0x5
+	ldr r0, _020C5838 ; =FX_AtanTable_
+	mov r1, r1, lsl #0x1
+	ldrsh r0, [r0, r1]
+	add r0, r4, r0
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	ldmia sp!, {r4,lr}
+	bx lr
+_020C580C:
+	mov r0, r3
+	bl FX_Div
+	mov r1, r0, asr #0x5
+	ldr r0, _020C5838 ; =FX_AtanTable_
+	mov r1, r1, lsl #0x1
+	ldrsh r0, [r0, r1]
+	sub r0, r4, r0
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	ldmia sp!, {r4,lr}
+	bx lr
+	.balign 4
+_020C5838: .word FX_AtanTable_
+
+	arm_func_start FX_Atan
+FX_Atan: ; 0x020C583C
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	cmp r0, #0x0
+	blt _020C58A4
+	cmp r0, #0x1000
+	ble _020C5880
+	bl FX_Inv
+	mov r1, r0, asr #0x5
+	ldr r0, _020C5924 ; =FX_AtanTable_
+	mov r1, r1, lsl #0x1
+	ldrsh r0, [r0, r1]
+	add sp, sp, #0x4
+	rsb r0, r0, #0x4000
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	ldmia sp!, {lr}
+	bx lr
+_020C5880:
+	cmp r0, #0x1000
+	movlt r1, r0, asr #0x5
+	ldrlt r0, _020C5924 ; =FX_AtanTable_
+	movlt r1, r1, lsl #0x1
+	ldrlth r0, [r0, r1]
+	add sp, sp, #0x4
+	movge r0, #0x2000
+	ldmia sp!, {lr}
+	bx lr
+_020C58A4:
+	mov r1, #0x1000
+	rsb r1, r1, #0x0
+	cmp r0, r1
+	bge _020C58E4
+	rsb r0, r0, #0x0
+	bl FX_Inv
+	mov r1, r0, asr #0x5
+	ldr r0, _020C5924 ; =FX_AtanTable_
+	mov r1, r1, lsl #0x1
+	ldrsh r0, [r0, r1]
+	add sp, sp, #0x4
+	sub r0, r0, #0x4000
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	ldmia sp!, {lr}
+	bx lr
+_020C58E4:
+	cmp r0, r1
+	addle sp, sp, #0x4
+	movle r0, #0xe000
+	ldmleia sp!, {lr}
+	bxle lr
+	rsb r0, r0, #0x0
+	mov r1, r0, asr #0x5
+	ldr r0, _020C5924 ; =FX_AtanTable_
+	mov r1, r1, lsl #0x1
+	ldrsh r0, [r0, r1]
+	rsb r0, r0, #0x0
+	mov r0, r0, lsl #0x10
+	mov r0, r0, lsr #0x10
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020C5924: .word FX_AtanTable_