FPS Counter

OtakuCODE · 2000-07-28T22:15:10

I''ve implemented an FPS counter in my game using some of the code NeHe had in his Tutorial 23 (the timer junk, I made a timer class out of it so I wasn''t just getting fat on global variables). This is basically the pseudocode of how I''m counting my framerate, I''d appreciate it if anyone could point out any possible logical errors: On program init, initialize the timer. In the message loop, where the Display() function is called (I''m not using a NeHe shell, I''m using the one from the glGameDeveloper() website (which has disappeared)), I get the current time passed since the timer was initialized. I also have a static variable keeping track of the last time Display() was called. Both of those are store in milliseconds in floats. I subtract the current time minus the last time and divide that into 1000 to get an immediate fps estimate. I calculate the FPS before Display() is actually called because I do not simply want to test how many FPS the display routine is running at, but because I want to see how many fps are actually being done, including the Idle() routine, message handling, etc. When I do this my very simple game (36 cubes, 2 glu spheres, all drawn with display lists) hovers around 70 - 80fps at all times. Shouldn''t this be running at 300fps or something ridiculous like that? Should I only be timing the display routine to get the time? Or are people claiming an fps of 300+ and such timing just the display and ignoring how many frames are actually getting drawn? (I know real games can''t do it this way otherwise their FPS reading would be totally bogus and adding 2 million lines of AI code wouldn''t slow down the FPS at all). Thanks in advance for any advice. Oh, wait, I should mention some system specs... I''m running an Athlon 500 with a geForce256 32MB DDR/DVI. When I send this to a friend of mine running an Athlon 750 with a geForce2 GTS 64MB DDR it runs 90-100fps. ----------------------- Go for it. OtakuCODE

NeHe Productions Affiliates

Started by OtakuCODE July 21, 2000 05:41 PM

13 comments, last by OtakuCODE 24 years, 3 months ago

OtakuCODE

Author

122

July 28, 2000 05:03 PM

I don''t disable vsyncing in my OpenGL program, I do it in my drivers. You can do it with Windows API calls if you want to, but I figure why override what someone has set their driver to do?

OldManDave: "proggie" and "puter" and some of the other words you mentioned are signs of past AOL use. If you see people using them you can pretty much guarantee they''re either on AOL, from AOL, or 12 years old. "coding" and "box" have been around since the beginning of time, though.

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Go for it.
OtakuCODE

-----------------------Go for it.OtakuCODE

Peacekeeper3

122

July 28, 2000 06:57 PM

Ah. AOL''er am I? Your brilliant figured that out from that one word.

Now moving on to opengl. Whats the API call?

zedzeek

529

July 28, 2000 08:55 PM

wglSwapIntervalEXT(0); // 0 off 1 on

Captain Courgette, eat more veg

TipTup

122

July 28, 2000 09:33 PM

The code I use to do FPS is available at glGameDeveloper, it seems to work fine..

-TipTup
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-TipTupTipTup.Com Speared Fish Design Studios My GameDev.Net Profile

OtakuCODE

Author

122

July 28, 2000 10:15 PM

glGameDeveloper also doesn''t exist any more... the page is gone or something...

Too bad, it was a great site, I''m using the shell from the first tutorial there.

-----------------------
Go for it.
OtakuCODE

-----------------------Go for it.OtakuCODE

FPS Counter

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