[gl4java-usergroup] testing listener model : performance increase not obvious :(

[Alban C. <aco...@wa...>]

Hi everybody,

I've been reading Kenneth words about increasing performance using the event
listener model with a lot of interest. So I have jumped on my keyboard in
order to test if it would improve the display speed of my application, wich
is divided by 2 at high resolution, so I have some kind of *fill rate*
problem...

Untill now, I was using a simple subclass of GLAnimCanvas wich I refer as
the "classic model" in the little benchmarck below.

I have implemented the GLEventlistener model using all the optimizations
kenneth refers in his mail :

  - Create a gl4java.GLCapabilities object
  - Pass this capabilities object to
gl4java.drawable.GLDrawableFactory.getFactory()
  - Call addGLEventListener on the resulting GLDrawable
For highest performance:
  - Call GLDrawableFactory.createGLAnimCanvas()
  - Call setUseRepaint(false), setUseFpsSleep(false), and
    setUseYield(false) on the resulting GLAnimCanvas


I am using gl4java 2.8 very latest release from sourceforge.
I run a geforce 2 MX 100 with 32MB onboard.
OS is windows 2000.
Meshes are displayed with no optimisation (neither arrays nor display lists)
Meshes are non textured.
Meshes are lit.

here are the results I get :

plane (1600 Polys) classic model
UC util = 42%		640*480		85 img/sec
UC util = 28%		1280*960		43 img/sec

plane (1600 Polys) listener model
UC util = 42% 		640*480		85 img/sec
UC util = 25%		640*480		43 img/sec

sphere (40 000 Polys) classic model
UC util = 100%		640*480		7  img/sec
UC util = 100%		1280*960		7 img/sec

sphere (40 000 Polys) listener model
UC util = 100% 		640*480		7  img/sec
UC util = 100% 		1280*960		7 img/sec

I couldn't notice a performance increase and the result appear to be very
similar.
Too bad... :(
I like better the listener model programming way though.
I have great expectations using the fullscreen exclusive mode, this should
help my fill rate issue...but that will be for tomorow :)

Regards,

Alban Cousinie