frames per second??? having problems with code from an earlier post

Author

122

August 29, 2000 10:42 AM

I got this code from an earlier post on how to do frames per second, but when I put in into my code I get a link error. "error LNK2001: unresolved external symbol __imp__timeGetTime@0" Is there header file or library that I should be including with this code in my project??? Thanks Tom ---------------------------------- #define FPS_INTERVAL 50 DWORD timePrev. timeFPS; WORD FPS, FPSCounter; float timeElapsed; void InitTimer() { FPSCounter = FPS = 0; timePrev = timeFPS = timeGetTime(); } /* La seguente funzione deve essere richiamata AD OGNI CICLO di rendering per il corretto calcolo degli FPS */ void TickTimer() { timeElapsed = (timeGetTime() - timePrev) / 1000.0f; timePrev = timeGetTime(); if(FPSCounter == FPS_INTERVAL) { FPS = (WORD)((FRAME_INTERVAL * 1000) / (timePrev - timeFPS)); FPSCounter = 0; } else FPSCounter++; }

AMD Tbird 1GHz 266FSB, ASUS A7V133, Crucial 768MB PC133 SDRAM, PlexWriter 12X/10X/32X CD-RW, Voodoo3 2000 PCI, Creative SoundBlaster Live!, Maxtor 7200rpm 13.3GB, IBM 5200rpm 3.2GB, Samsung 955DF 19" Monitor, LinkSys USB100TX Ethernet Network Adapter,Rogers@Home, Win2000/Linux Mandrake 8.0

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122

August 29, 2000 01:16 PM

timeGetTime() is declared in Mmsystem.h

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th032

Author

122

August 29, 2000 03:25 PM

k, I got rid of the link error and the program runs but I don''t think its producing the correct framerate. It starts at 5 and eventually goes down to 1, never goes up in frame rate even when I change it to a view where it doesn''t draw anything(it really looks like I''m getting something like +40fps).

I think though that I may be making a mistake in the printing of the FPS, so I''m not sure if thats whats messing it up. I using Bitmap fonts from Tut13 and here is the command "glPrint("FPS - %f", (float)FPS);", I wasn''t sure what character to use for the WORD type for the function so I converted it to a float, don''t know if maybe this is the reason it gives me the wrong framerate but I doubt it. So what is the problem???

I did try modifying the code myself, and I get around 35fps(seems a little low) but I''m just not sure if I did it correct cause when I change it here to a view where it doesn''t draw anything I''m gettting around 40fps(thats just too low).

If u guys could look over my modified code and give me any suggestions, I would greatly appreciated!

Here''s my new modified code:
---------------------------------------------
DWORD timePrev;
WORD FPScounter;
float FPS, timeElapsed;

/////////////////////////////
// Initialize timer variables
void InitTimer()
{
FPScounter = 0; timeElapsed = FPS = 0.0f;
timePrev = timeGetTime();
}

/////////////////////////////
// Calculate frames per second
void TickTimer()
{
FPScounter++;
timeElapsed += (timeGetTime() - timePrev) / 1000.0f;
timePrev = timeGetTime();
FPS = FPScounter / timeElapsed;
}

I call InitTimer in InitGL(), and TickTimer() in DrawGLScene() before anything else is done.

AMD Tbird 1GHz 266FSB, ASUS A7V133, Crucial 768MB PC133 SDRAM, PlexWriter 12X/10X/32X CD-RW, Voodoo3 2000 PCI, Creative SoundBlaster Live!, Maxtor 7200rpm 13.3GB, IBM 5200rpm 3.2GB, Samsung 955DF 19" Monitor, LinkSys USB100TX Ethernet Network Adapter,Rogers@Home, Win2000/Linux Mandrake 8.0

th032

Author

122

August 29, 2000 03:25 PM

k, I got rid of the link error and the program runs but I don''t think its producing the correct framerate. It starts at 5 and eventually goes down to 1, never goes up in frame rate even when I change it to a view where it doesn''t draw anything(it really looks like I''m getting something like +40fps).

I think though that I may be making a mistake in the printing of the FPS, so I''m not sure if thats whats messing it up. I using Bitmap fonts from Tut13 and here is the command "glPrint("FPS - %f", (float)FPS);", I wasn''t sure what character to use for the WORD type for the function so I converted it to a float, don''t know if maybe this is the reason it gives me the wrong framerate but I doubt it. So what is the problem???

I did try modifying the code myself, and I get around 35fps(seems a little low) but I''m just not sure if I did it correct cause when I change it here to a view where it doesn''t draw anything I''m gettting around 40fps(thats just too low).

If u guys could look over my modified code and give me any suggestions, I would greatly appreciated!

Here''s my new modified code:
---------------------------------------------
DWORD timePrev;
WORD FPScounter;
float FPS, timeElapsed;

/////////////////////////////
// Initialize timer variables
void InitTimer()
{
FPScounter = 0; timeElapsed = FPS = 0.0f;
timePrev = timeGetTime();
}

/////////////////////////////
// Calculate frames per second
void TickTimer()
{
FPScounter++;
timeElapsed += (timeGetTime() - timePrev) / 1000.0f;
timePrev = timeGetTime();
FPS = FPScounter / timeElapsed;
}

I call InitTimer in InitGL(), and TickTimer() in DrawGLScene() before anything else is done.

AMD Tbird 1GHz 266FSB, ASUS A7V133, Crucial 768MB PC133 SDRAM, PlexWriter 12X/10X/32X CD-RW, Voodoo3 2000 PCI, Creative SoundBlaster Live!, Maxtor 7200rpm 13.3GB, IBM 5200rpm 3.2GB, Samsung 955DF 19" Monitor, LinkSys USB100TX Ethernet Network Adapter,Rogers@Home, Win2000/Linux Mandrake 8.0

Anonymous

September 02, 2000 03:21 PM

An easier way to do FPS is like this.

#include

#define EXPECTED_FPS 24 // use your best judgement here,
// but it doesn''t matter too much.

double fps_avg = EXPECTED_FPS, fps;
clock_t timeprev, timenow;

timeprev = clock() - EXPECTED_FPS;

while (!done) {
// Do your dawing
timenow = clock();
fps = 1000.0 / (double)(timenow - timeprev);
avg_fps = (avg_fps + fps) / 2.0; // this isn''t a *true*
// average, but it''s actually better, because it puts
// more weight on the most recent frame times
timeprev = timenow;
}

// now avg_fps should be your average frame rate