limiting FPS

[vrm]

there is a way for limit FPS ( to somthing like 50 ~ 60 FPS) for free some CPU (example : for network thread or gc) ?

[Chman]

I think the only way to limit FPS is to use Thread.sleep()....

[princec]

This snatch of code from Alien Flux is what I use:

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if (!GL.WGL_EXT_swap_control) {                               float elapsed = 0.0f;                               frameTime = 0.0f;                               do {                                     long now = Sys.getTime();                                     elapsed = (float)(now - then) / (float)Sys.getTimerResolution();                                     if (frameTime == 0.0f)                                           frameTime = elapsed;                                     if (elapsed < FRAME_TIME)                                           Thread.sleep(1);                               } while (elapsed < FRAME_TIME);                               gl.swapBuffers();                         } else {                               long now = Sys.getTime();                               frameTime = (float)(now - then) / (float)Sys.getTimerResolution();                               gl.swapBuffers();                         }

If it can't get WGL_EXT_swap_control I've found that doing loads of tiny sleeps is lighter on the CPU than a processor-hogging busy loop. Especially as I run at high priority.

Cas

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[vrm]

trying that
BTW :
FRAME_TIME , got an advise on this value ?

what is the 'then' variable in your code ?

[princec]

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/** How many frames per second we want */ public static final int DESIRED_FPS = 60; /** The duration of one frame, in seconds */ public static final float FRAME_TIME = 1.0f / (float) DESIRED_FPS; ...                         long then = Sys.getTime();                         // Do drawing here                         // Then cap frame rate as above here

Cas

[vrm]

Thanks ! it works very well

no more GC lags cause there is plenty free CPU times

btw about GC :
java -server -Xms512m -Xmx512m -XX:NewSize=64m -XX:MaxNewSize=64m -XX:SurvivorRatio=2 -XX:+UseConcMarkSweepGC

I tryed to use new 1.4.1 GC, it's really nice, reduce the GC lag effect

for reference: http://wireless.java.sun.com/midp/articles/garbagecollection2/#4.3