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 /macros.asm | |
| parent | 2a2b5d7f23fc4b0beda9ae9ab084d145c7690953 (diff) | |
Use a macro for sine waves.
So far they're identical, but amplitude could change.
Diffstat (limited to 'macros.asm')
| -rw-r--r-- | macros.asm | 11 |
1 files changed, 11 insertions, 0 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 + |