Re: [GtkGLExt] gears stop rotating

[Philipp Klaus Krause <pkk spth de>]

Mitchell Laks schrieb:
> Hi,
> 
> If I compile and run the gtkglextmm  demo  program
> "gears" on my debian box, 
> then after a few hours the gears stop rotating (sometimes takes many hours, 
> but eventually this  happend-
> the screen no longer updates of the rotating  of the gears and they appear 
> "frozen"
> 
> while the controlling console still "updates" with the supposed high value for 
> rotations/sec. Moreover the numbers displayed continue to change if you 
> change the size of the screen or cover the  non-rotating gears. Odd.
> 
> On the other hand I had the same behavior with the famous standard X 
> application
> glxgears.
> 
> what causes this behavior?
> 
> I am curious...

It's a small bug I fixed some time ago in glxgears:
The angle of rotation is stored in a float value. Each frame
a constant is added to it. After some time that adding of a constant
is effectively a noop due to limited floating-point precision.

Philipp