diff options
| author | yenatch <yenatch@gmail.com> | 2014-05-05 15:58:43 -0400 |
|---|---|---|
| committer | yenatch <yenatch@gmail.com> | 2014-05-05 15:58:43 -0400 |
| commit | ddc88bed4bab836b04ae11f0404baa03d001d3df (patch) | |
| tree | fc3e8b859e4c7e63a3c950461f7fa851d3c8bfee | |
| parent | 2a2b5d7f23fc4b0beda9ae9ab084d145c7690953 (diff) | |
Use a macro for sine waves.
So far they're identical, but amplitude could change.
| -rw-r--r-- | macros.asm | 11 | ||||
| -rw-r--r-- | main.asm | 27 |
2 files changed, 15 insertions, 23 deletions
diff --git a/macros.asm b/macros.asm index a35b833df..a9948ae6a 100644 --- 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 + @@ -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 |