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List:       xfree86-devel
Subject:    Re: Radeon performance, z-buffer clears
From:       Ian Romanick <idr () us ! ibm ! com>
Date:       2003-10-27 18:27:03
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Vahur Sinijarv wrote:

> Does anyone know if fast z-buffer clears and 'z-compression aka hyper-z'
> are going to be implemented in radeon DRI drivers (actually it is in the
> 'radeon' kernel module). It seems to be one of the areas where major
> performance gain could be achieved, taking this driver to the same
> performance level as ATI's binary only driver has. I've done some perf.
> tests and by disabling z-clears frame rates almost double, which shows
> that the current approach by drawing a dummy quad is very slow ... I
> would be willing to implement it myself if anyone would tell me where to
> find information about programming this feature.

ATI has not provided documentation for this feature to developers. 
Until then, it has zero chance of being implemented in open-source drivers.

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