diff options
Diffstat (limited to 'src/util/numeric.h')
| -rw-r--r-- | src/util/numeric.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/util/numeric.h b/src/util/numeric.h index f7df19ca9..61370a3f4 100644 --- a/src/util/numeric.h +++ b/src/util/numeric.h @@ -376,3 +376,22 @@ inline u32 npot2(u32 orig) { orig |= orig >> 16; return orig + 1; } + +// Gradual steps towards the target value in a wrapped (circular) system +// using the shorter of both ways +template<typename T> +inline void wrappedApproachShortest(T ¤t, const T target, const T stepsize, + const T maximum) +{ + T delta = target - current; + if (delta < 0) + delta += maximum; + + if (delta > stepsize && maximum - delta > stepsize) { + current += (delta < maximum / 2) ? stepsize : -stepsize; + if (current >= maximum) + current -= maximum; + } else { + current = target; + } +} |