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Clean scaling pre-filter for formspec/HUD.

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This commit is contained in:
Aaron Suen 2015-03-09 09:32:11 -04:00 • committed by kwolekr
parent b4247dff2e
commit 6d61375cc7
20 changed files with 524 additions and 102 deletions
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13
src/util/numeric.h
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@ -411,5 +411,16 @@ inline bool is_power_of_two(u32 n)
return n != 0 && (n & (n-1)) == 0;
}
#endif
// Compute next-higher power of 2 efficiently, e.g. for power-of-2 texture sizes.
// Public Domain: https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
inline u32 npot2(u32 orig) {
orig--;
orig |= orig >> 1;
orig |= orig >> 2;
orig |= orig >> 4;
orig |= orig >> 8;
orig |= orig >> 16;
return orig + 1;
}
#endif