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Changes profiler to use the high precision timer built into windows.

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Also removes the legacy GetTickCount() fallback as that is no longer necessary in modern versions of windows (Windows XP and greater support QueryPerformanceCounter)
This commit is contained in:
Jeff Hutchinson 2020-12-28 18:14:21 -05:00
parent 3b111b14cc
commit dee89e25b8
3 changed files with 38 additions and 110 deletions
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38
Engine/source/platformWin32/winTimer.cpp
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@ -30,14 +30,11 @@
class Win32Timer : public PlatformTimer
{
private:
U32 mTickCountCurrent;
U32 mTickCountNext;
S64 mPerfCountCurrent;
S64 mPerfCountNext;
S64 mFrequency;
F64 mPerfCountRemainderCurrent;
F64 mPerfCountRemainderNext;
bool mUsingPerfCounter;
public:
Win32Timer()
@ -45,43 +42,26 @@ public:
mPerfCountRemainderCurrent = 0.0f;
mPerfCountRemainderNext = 0.0f;
// Attempt to use QPC for high res timing, otherwise fallback to GTC.
mUsingPerfCounter = QueryPerformanceFrequency((LARGE_INTEGER *) &mFrequency);
if(mUsingPerfCounter)
mUsingPerfCounter = QueryPerformanceCounter((LARGE_INTEGER *) &mPerfCountCurrent);
QueryPerformanceFrequency((LARGE_INTEGER *) &mFrequency);
QueryPerformanceCounter((LARGE_INTEGER *) &mPerfCountCurrent);
mPerfCountNext = 0.0;
if (!mUsingPerfCounter)
mTickCountCurrent = GetTickCount();
else
mTickCountCurrent = 0;
mTickCountNext = 0;
}
const S32 getElapsedMs()
{
if(mUsingPerfCounter)
{
// Use QPC, update remainders so we don't leak time, and return the elapsed time.
QueryPerformanceCounter( (LARGE_INTEGER *) &mPerfCountNext);
F64 elapsedF64 = (1000.0 * F64(mPerfCountNext - mPerfCountCurrent) / F64(mFrequency));
elapsedF64 += mPerfCountRemainderCurrent;
U32 elapsed = (U32)mFloor(elapsedF64);
mPerfCountRemainderNext = elapsedF64 - F64(elapsed);
// Use QPC, update remainders so we don't leak time, and return the elapsed time.
QueryPerformanceCounter( (LARGE_INTEGER *) &mPerfCountNext);
F64 elapsedF64 = (1000.0 * F64(mPerfCountNext - mPerfCountCurrent) / F64(mFrequency));
elapsedF64 += mPerfCountRemainderCurrent;
U32 elapsed = (U32)mFloor(elapsedF64);
mPerfCountRemainderNext = elapsedF64 - F64(elapsed);
return elapsed;
}
else
{
// Do something naive with GTC.
mTickCountNext = GetTickCount();
return mTickCountNext - mTickCountCurrent;
}
return elapsed;
}
void reset()
{
// Do some simple copying to reset the timer to 0.
mTickCountCurrent = mTickCountNext;
mPerfCountCurrent = mPerfCountNext;
mPerfCountRemainderCurrent = mPerfCountRemainderNext;
}