[Xorg-driver-geode] Rendering in geode

[Alex Deucher]

On Fri, Jun 18, 2010 at 5:48 PM, Jonathan Morton
<jonathan.morton at movial.com> wrote:
> On 17 June 2010 10:48, Huang, FrankR <FrankR.Huang at amd.com> wrote:
>> What I want to ask is that does driver need handle these all? I think it is a huge burden for the driver to judge. Why the server gave such parameters to driver? Maybe one of this special condition can make the driver rendering result fails, just as geode. And the most important thing is that, if the driver found it can not do that rendering, it is to late for put the rendering back to Xserver SW method.
>
> I suspect that EXA's designers didn't consider hardware quite as
> simple as Geode when working out the API.
>
> In fact, I believe they were thinking of the Intel GMA core series,
> which requires some setup before use, and is not normally considered a
> high-performance solution, but is fairly flexible.  Most PC-style
> hardware is either of that type, or considerably more capable (such as
> your X1200), or is considered too old to be worth implementing the
> Composite function for (eg. original Matrox Mystique).
>

It was designed with basic 3D engines that support multi-texture in
mind.  This covers most basic GL and DX hardware.

> An unfortunate fact of EXA is that you need to throughly understand
> XRender's requirements when implementing the Composite function.  This
> is fairly poorly documented.

It's fairly easy to match up to 3D engines, but for cards that
implement subsets of the 3D functionality in the 2D engine, it's a bit
more complicated.

Alex

>
>  - Jonathan Morton
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