[Quesa-develop] Re: Quesa rendering speed

[Tom S. <to...@as...>]

To clarify the problem, here are the results of some timed tests:

I tried the rendering the same simple model with many different
sizes of texture:

Here are the results:
a) texture w:250 h:250, render time: 94 - 109 ms
b) texture w:260 h:260, render time: 297 - 328 ms
c) texture w:500 h:500, render time: 297 - 328 ms

-Computer used: Celeron 2.2GHz, WinXP, 192MB RAM
-Quesa 1.6d18 (release version), 32bpp PixmapDrawContext, w:163, h:193
-Model was: 6 4-sided TQ3Polygons, immediate mode
-In each test, one 32bpp texture was used to texture all the faces.
-Model was rendered more than once in each test to avoid
any 1st-render overhead. The program was restarted in each case.

I find these results interesting, because the texture in
test b is just 8% larger than in a, yet takes
3x as long to render. Something to do with
a cache limit, perhaps?

Any ideas/more info on this are gratefully received.

Tom



> Hi,
> 
> I am experiencing the following issue with a Quesa based
> app I am writing:
> 
> Win32 and Mac OS X (I havent tested on other platforms):
> Rendering any textured model to an offscreen DrawContext seems
> to take a very long time. I get roughly 3 fps on a 2.2GHz P4 for the
> simplest of textured models in a 160x200, 32bpp PixmapDrawContext.
> 
> Non textured models render much faster, and on-screen rendering
> of any model performs great.
> 
> Is this expected behaviour for Quesa, or am I doing something wrong?
> 
> Thanks,
> 
> Tom