1 files changed, 3 insertions, 36 deletions
diff --git a/engine/math/sine.asm b/engine/math/sine.asm
index e22d785a..5db3bd60 100644
--- a/engine/math/sine.asm
+++ b/engine/math/sine.asm
@@ -1,40 +1,7 @@
-_Sine:: ; 8ac9 (2:4ac9)
+_Sine::
+; a = d * sin(e * pi/256)
 	ld a, e
-	and $3f
-	cp $20
-	jr nc, .negative
-	call .GetSine
-	ld a, h
-	ret
-.negative
-	and $1f
-	call .GetSine
-	ld a, h
-	xor $ff
-	inc a
-	ret
-
-.GetSine: ; 8adf (2:4adf)
-	ld e, a
-	ld a, d
-	ld d, $0
-	ld hl, .SineWave
-	add hl, de
-	add hl, de
-	ld e, [hl]
-	inc hl
-	ld d, [hl]
-	ld hl, $0
-.loop
-	srl a
-	jr nc, .no_add
-	add hl, de
-.no_add
-	sla e
-	rl d
-	and a
-	jr nz, .loop
-	ret
+	calc_sine_wave .SineWave
 
 .SineWave:
 	sine_table $100