Ok here’s the thing. I was testing my game at 50 frames per second. As you know the delay for 50 fps is 20 ms. I tried it out and all I could get was 32 fps.
I thought it was my game, so I stripped it out of “suspicious” methods and classes, but nothing. I ended up making a little program to test this fps situation.
The result was to say the least crazy. 20ms delay produces in reality a 31 or 32 ms delay. 19ms or 21ms (or anything else) delays are almost okay. Check out the code:
public class EmptyGame
{
public static void main( String[] args )
{
EmptyGame test = new EmptyGame();
}
// A delay of 20L should give us 50 fps (1000 / 20)
private static final long DELAY = 20L; // try either 19L or 21L to see the difference
public EmptyGame()
{
long startTime;
int frames = 0;
long fpsTime = System.currentTimeMillis();
while( true )
{
startTime = System.currentTimeMillis();
frames++;
if (startTime - fpsTime > 999)
{
System.out.println("FPS: " + frames);
frames = 0;
fpsTime = startTime;
}
try
{
Thread.sleep( DELAY );
} catch(Exception e) {}
// Un-comment the following line to see the actual delay
//System.out.print(System.currentTimeMillis()- startTime+" ");
}
}
}
Please try it out and see for yourself. Is there something that I’m not aware of? Another Java bug perhaps?
Thanks.
