Hello
<newbie=ON>
I'm playing with NSOpenGLView and trying to port glxgears to gnustep.
I reuse as code from glxgears as possible.
With glxgears I get 2225 FPS
With gnustep-gears I get 380 FPS !
Even when I draw nothing in my window (drawRect = flushBuffer) i only
get 480 FPS.
I think of 2 point :
- NSOpenGL* classes are very CPU intensive
- my frame loop is bad
I use [RunLoop-performSelecto:...] to loop. The documentation says the
selector is perform before the next runloop iteration.
<CODE>
- (void) nextAnimationFrame: (id) gl_view
{
NSTimeInterval thisFrame = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval sinceLastFrame = (thisFrame - _lastFrame);
_lastFrame = thisFrame;
[_scene nextFrameWithStep: sinceLastFrame];
[gl_view setNeedsDisplay: YES];
if(YES == _running)
{
if (!_rl_modes)
{
_rl_modes = [[NSArray alloc] initWithObjects: NSDefaultRunLoopMode,
NSModalPanelRunLoopMode,
NSEventTrackingRunLoopMode, nil];
}
[[NSRunLoop currentRunLoop]
performSelector: @selector(nextAnimationFrame:)
target: self
argument: gl_view
order: 10
modes: _rl_modes];
}
}
</CODE>
Does the RunLoop iteration timed ? I hope it runs as fast as possible...
Any comment will be welcome ! :-)
Thanks in advance
xavier
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