Re: External Screen on Powerbook?

[Roger H. <rog...@mi...>]

On 11 Jul, 2005, at 21:40, Steven Verstoep wrote:

> Hi Roger
>
> I will experiment tomorrow some more with the suggestions you gave
>
> >Of course if you customer has a machine with more VRAM
> >then they may not have the same size limitation. Are you by any chance
> >running on a Powerbook with an external screen attached?
>
> Yes I am. What do you conclude from this?
>
> I have a powerbook G4 550mhz, 512mb Ram Ati Rage 16mb video, OSX 
> 10.3.9 with an external screen set at 640x480x32bit (Game Resolution 
> Full screen)
>
> Steven Verstoep
> www.revaro.net
>
>

Hi Steven,

I used to have a very similar setup but with a 20 inch monitor. The 
built in screen
and the external screen both use up a chunk of VRAM, leaving OpenGL 
very little
space for the Z-buffer, its other buffers, triangle lists and texture 
memory.

In this configuration I used to get bizarre texture effects when using 
anything but the
smallest 3D windows. You could try disconnecting the external monitor 
and use just
the internal one and see if the problem goes away. Then you could 
change your
system requirements specification to preclude Powerbooks with external 
monitors.
Outside the developer community they are quite a rare configuration I 
believe.

Roger Holmes.