diff options
| author | Vito Caputo <vcaputo@gnugeneration.com> | 2016-12-30 20:39:11 -0800 |
|---|---|---|
| committer | Vito Caputo <vcaputo@gnugeneration.com> | 2016-12-30 20:39:11 -0800 |
| commit | 2273d9a80f4a087219d3d5fbdfa60037aabfecbf (patch) | |
| tree | a8e6668f3293d85ad8094298ad2f3aa9186e14bd | |
| parent | 7ac8684cd7928fcc497ddcfce06cf3b04d2ed7e5 (diff) | |
roto: some fixed point macro cleanups
| -rw-r--r-- | modules/roto/roto.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/modules/roto/roto.c b/modules/roto/roto.c index 21e68b7..bbf8bdb 100644 --- a/modules/roto/roto.c +++ b/modules/roto/roto.c @@ -8,13 +8,14 @@ /* Copyright (C) 2016 Vito Caputo <vcaputo@pengaru.com> */ /* Some defines for the fixed-point stuff in render(). */ -#define FIXED_TRIG_LUT_SIZE 4096 /* size of the cos/sin look-up tables */ -#define FIXED_BITS 12 /* fractional bits */ -#define FIXED_EXP 4096 /* 2^FIXED_BITS */ -#define FIXED_COS(_rad) costab[_rad % FIXED_TRIG_LUT_SIZE] -#define FIXED_SIN(_rad) sintab[_rad % FIXED_TRIG_LUT_SIZE] -#define FIXED_MULT(_a, _b) ((_a * _b) >> FIXED_BITS) -#define FIXED_NEW(_i) (_i << FIXED_BITS) +#define FIXED_TRIG_LUT_SIZE 4096 /* size of the cos/sin look-up tables */ +#define FIXED_BITS 11 /* fractional bits */ +#define FIXED_EXP (1 << FIXED_BITS) /* 2^FIXED_BITS */ +#define FIXED_MASK (FIXED_EXP - 1) /* fractional part mask */ +#define FIXED_COS(_rad) costab[(_rad) % FIXED_TRIG_LUT_SIZE] +#define FIXED_SIN(_rad) sintab[(_rad) % FIXED_TRIG_LUT_SIZE] +#define FIXED_MULT(_a, _b) (((_a) * (_b)) >> FIXED_BITS) +#define FIXED_NEW(_i) ((_i) << FIXED_BITS) #define FIXED_TO_INT(_f) ((_f) >> FIXED_BITS) |