Re: 3D texture size limitations in mesa/r200?

On Jan 4, 2008 1:55 AM, R. Aditya Kadambi <[email protected]> wrote:
> Hi;
>
> I am trying do hardware accelerated volume rendering with 3D textures using
> a scenegraph called OpenRM(www.openrm.org). The program is called vrend
> which uses 3D textures
>  to HW render 3D raw data.
>
> I am using ATI X9250 (R200) card. I am trying to render two sets of raw
> data. The smaller one which is 64x64x64 is successfully rendered with 3D
> textures with r200 driver. The bigger volume which is 256x64x256 only
> appears to be rendered in "half" along the z axis. The other half appears as
> garbage.
>
> I put in a call for 3D texture size and it comes as 256 (which probably
> means I can render a 256x256x256 cube??).
>
> I was able to successfully Software render it on Mesa. It renders fine.
> Furthermore, it is rendered fine with the ATI proprietary driver (V 8.28.8)
> (surprise! surprise!).
>
> This makes me suspect the r200 driver. Is there an inherent limitation or a
> bug or a missing feature in the driver (r200/mesa) which might cause this.
> Is there any way for me to compile mesa with debug flags to test this? Or is
> there a bug in the lower level ati driver?
>

The r200 has a hardware-limitation of 2048x2048 for 2d textures. I'm
not sure, but this problem might be related to that.

Regards, Alexander Toresson

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