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Use a macro for sine waves.

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So far they're identical, but amplitude could change.
This commit is contained in:
yenatch 2014-05-05 15:58:43 -04:00
parent 2a2b5d7f23
commit ddc88bed4b
2 changed files with 15 additions and 23 deletions
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11
macros.asm
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@ -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

27
main.asm
View File

@ -7722,11 +7722,7 @@ Function84ef: ; 84ef
SineWave: ; 850b
; A $20-word table representing a sine wave.
; 90 degrees is index $10 at a base amplitude of $100.
x set 0
rept $20
dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
x set x + $100 * $40000
endr
sine_wave $100
; 854b
@ -52516,12 +52512,7 @@ Function49b52: ; 49b52 (12:5b52)
; 49b6e (12:5b6e)
Unknown_49b6e: ; 49b6e
; Yet another sine wave.
x set 0
rept $20
dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
x set x + $100 * $40000
endr
sine_wave $100
; 49bae
Function49bae: ; 49bae
@ -75538,12 +75529,7 @@ Function8c70c: ; 8c70c (23:470c)
; 8c728 (23:4728)
Unknown_8c728: ; 8c728
; Another sine wave?
x set 0
rept $20
dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
x set x + $100 * $40000
endr
sine_wave $100
; 8c768
; no known jump sources
@ -79367,12 +79353,7 @@ Function8e741: ; 8e741
; 8e75d
Unknown_8e75d: ; 8e75d
; A sine wave.
x set 0
rept $20
dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
x set x + $100 * $40000
endr
sine_wave $100
Function8e79d: ; 8e79d