Re: [Dri-users] DRI and Constructive Solid Geometry

[magenta <ma...@tr...>]

On Wed, Feb 05, 2003 at 12:20:49PM -0700, Keith Whitwell wrote:
> magenta wrote:
> > On Wed, Feb 05, 2003 at 11:47:35AM -0500, Antonio MATTA wrote:
> > 
> >>
> >>Hi,
> >>
> >>I have finally been able to make Xfree86 DRI work with my ATI Rage 128 Pro TF
> >>video card and I have been working in a 3D model viewer aplication for
> >>some time now. This aplication supports the making of complex 3D solids
> >>through a technique called CSG (Constructive Solid Graphics). The question
> >>is that if I am working in Inderict Rendering mode this CSG solids works
> >>rather well (rotation, traslation, zooming), but if I run again this
> >>aplication working with a DRI XFree86 server it hangs up (the CSG solids
> >>does not look well, rotation and traslation works very slow).
> >>
> >>Does anybody has any idea what is going on.
> > 
> > 
> > Many CSG-based renderers use the stencil buffer in order to perform the CSG
> > operations.  Stencil buffers have historically not been supported in
> > hardware in the DRI drivers, likely because it's a fairly low priority for
> > most realtime applications.
> 
> Umm, I'm pretty sure the r128 has an 8bit stencil in 32bpp modes.

Hardware, yes.  But what about the driver?

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