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

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

svn-id: r30896

1 files changed, 6 insertions, 0 deletions

diff --git a/common/util.cpp b/common/util.cpp
index 82a910f9a8..1f48a6ddd9 100644
--- a/common/util.cpp
+++ b/common/util.cpp
@@ -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;
 }