Use a macro for sine waves.

So far they're identical, but amplitude could change.
2014-05-05 15:58:43 -04:00
parent 2a2b5d7f23
commit ddc88bed4b
2 changed files with 15 additions and 23 deletions
--- a/macros.asm
+++ b/macros.asm
@@ -191,3 +191,14 @@ ENDC
 ENDM


+sine_wave: MACRO
+; \1: amplitude
+
+x = 0
+	rept $20
+	; Round up.
+	dw (sin(x) + (sin(x) & $ff)) >> 8
+x = x + \1 * $40000
+	endr
+ENDM
+