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limit vsync frame rate estimation deviation

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git-svn-id: https://gambatte.svn.sourceforge.net/svnroot/gambatte@167 9dfb2916-2d38-0410-aef4-c5fe6c9ffc24
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sinamas 2008-10-14 00:18:09 +00:00
parent 79b1bf5f8f
commit d314c4ce2b
1 changed files with 7 additions and 1 deletions
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8
gambatte_qt/src/blitterwidget.cpp
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@ -23,7 +23,7 @@
void FtEst::init(const long frameTime) {
this->frameTime = frameTime;
ft = 0;
ftAvg = frameTime * COUNT;
ftAvg = frameTime << COUNT_LOG2;
ftVar = ftAvg >> 12;
last = 0;
count = COUNT;
@ -37,6 +37,12 @@ void FtEst::update(const usec_t t) {
count = COUNT;
long oldFtAvg = ftAvg;
ftAvg = (ftAvg * 15 + ft + 8) >> 4;
if (ftAvg > ((frameTime + (frameTime >> 5)) << COUNT_LOG2))
ftAvg = (frameTime + (frameTime >> 5)) << COUNT_LOG2;
else if (ftAvg < ((frameTime - (frameTime >> 5)) << COUNT_LOG2))
ftAvg = (frameTime - (frameTime >> 5)) << COUNT_LOG2;
ftVar = (ftVar * 15 + std::abs(ftAvg - oldFtAvg) + 8) >> 4;
ft = 0;
}