thirdparty/scummvm
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Tweaks to fmopl; same net effect overall, just faster.

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Eliminate divisions, floating point, and mod operation from inner synth loop.

svn-id: r30896
This commit is contained in:
Robin Watts 2008-02-17 16:12:54 +00:00
parent 5b31fe75d4
commit 890bca8f7e
3 changed files with 37 additions and 20 deletions
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6
common/util.cpp
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@ -196,6 +196,12 @@ uint RandomSource::getRandomNumber(uint max) {
return _randSeed % (max + 1);
}
uint RandomSource::getRandomBit(void) {
_randSeed = 0xDEADBF03 * (_randSeed + 1);
_randSeed = (_randSeed >> 13) | (_randSeed << 19);
return _randSeed & 1;
}
uint RandomSource::getRandomNumberRng(uint min, uint max) {
return getRandomNumber(max - min) + min;
}