diff options
Diffstat (limited to 'macros/code.asm')
| -rw-r--r-- | macros/code.asm | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/macros/code.asm b/macros/code.asm index 1fb651f30..9429884ca 100644 --- a/macros/code.asm +++ b/macros/code.asm @@ -1,11 +1,11 @@ ; Syntactic sugar macros lb: MACRO ; r, hi, lo - ld \1, (((\2) & $ff) << 8) | (((\3) & $ff)) + ld \1, ((\2) & $ff) << 8 | ((\3) & $ff) ENDM ln: MACRO ; r, hi, lo - ld \1, (((\2) & $f) << 4) | (((\3) & $f)) + ld \1, ((\2) & $f) << 4 | ((\3) & $f) ENDM ldpixel: MACRO @@ -19,7 +19,6 @@ ENDM depixel EQUS "ldpixel de," bcpixel EQUS "ldpixel bc," - ; Design patterns jumptable: MACRO @@ -36,8 +35,10 @@ jumptable: MACRO ENDM maskbits: MACRO -; masks just enough bits to cover the argument +; masks just enough bits to cover the first argument +; the second argument is an optional shift amount ; e.g. "maskbits 26" becomes "and %00011111" (since 26 - 1 = %00011001) +; and "maskbits 3, 2" becomes "and %00001100" (since "maskbits 3" becomes %00000011) ; example usage in rejection sampling: ; .loop ; call Random @@ -50,7 +51,11 @@ if x + 1 < (\1) x = x << 1 | 1 endc endr +if _NARG == 2 + and x << (\2) +else and x +endc ENDM calc_sine_wave: MACRO |