allanger/ardour
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Activity

Optimize exponential interpolation.

Browse Source
This commit is contained in:
Robin Gareus
2019-01-19 10:24:25 +01:00
parent 616ee4e43b
commit bf728520ca
1 changed files with 8 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
libs/pbd/pbd/control_math.h
View File

@@ -86,12 +86,18 @@ interpolate_linear (double from, double to, double fraction)
}
static inline double
interpolate_logarithmic (double from, double to, double fraction, double lower, double upper)
interpolate_logarithmic (double from, double to, double fraction, double /*lower*/, double /*upper*/)
{
// this is expensive -- optimize
#if 0
/* this is expensive, original math incl. range-check assertions */
double l0 = logscale_to_position (from, lower, upper);
double l1 = logscale_to_position (to, lower, upper);
return position_to_logscale (l0 + fraction * (l1 - l0), lower, upper);
#else
assert (from > 0 && from * to > 0);
assert (fraction >= 0 && fraction <= 1);
return from * pow (to / from, fraction);
#endif
}
static inline double