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High Precision Timers

General and Gameplay Programming Programming

Started by Grain September 06, 2005 05:30 AM

10 comments, last by Jan Wassenberg 18 years, 7 months ago

UltimaX

468

September 07, 2005 05:46 PM

Here's part of my timer class. I don't remember exactly where I got the ASM, but it seems to work pretty well:

void P25DTIMER::GetTick(void* Tick){    if(m_TimerType == P25DTMR_CPU)    {        __asm        {	    PUSH  EDX;	    PUSH  ECX;	    MOV   ECX, Tick;	    _EMIT 0Fh	    _EMIT 31h	    MOV   [ECX], EAX;	    MOV   [ECX + 4], EDX;	    POP	 ECX;	    POP   EDX;	}    }    else if(m_TimerType == P25DTMR_HIRES)    {	QueryPerformanceCounter((LARGE_INTEGER*)Tick);    }}

Then you can use it like:
float CurrentTick = 0.0f;
GetTick(&CurrentTick);

Jan Wassenberg

1,000

September 08, 2005 06:06 AM

Due to lack of time all I can do is upload the wtime source/header to look at (GPL license); as said, the dependencies (system detect, CPU) are scattered around and cannot easily be included.

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High Precision Timers

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