WineD3D: gpu detection

[Roderick Colenbrander]

Use this patch instead. It is an updated version of the previous patch but this time, the geforce4mx is put under D3D7. It was a small error in the previous patch (the geforce4mx won't pass the d3d8 test).

Roderick

> Hi,
> 
> In case of Direct3D each device exports the pci device/vendor ids of the
> videocard. Lots of programs use these ids to get an idea about the
> capabilities of the card, enable/disable features based on the detected card or
> sometimes they are used for evil purposes aswell (working around bugs).
> 
> In case of OpenGL there's no way to retrieve the pci id. The most basic
> thing you can do is parse the opengl renderer string which contains the name
> and model of the videocard and translate this into a pci id. Only in case
> of Nvidia cards there are dozens of different videocards. Using smart tricks
> the list can be compressed. The main issue of this way is that it requires
> a lot of maintenance. If a card is too new, we would fall back to a very
> basic pci id or no id.
> 
> Another way would to 'ask' the operating system what card is in use. In
> case of linux /proc/bus/pci/devices could be parsed but this way is not very
> portable, it isn't 100% reliable as you might be using remote X or you
> might have multiple videocards installed. This way is not a good option.
> 
> This patch tackles the problem in a different way. The idea is not to
> return the exact videocard but a close match (a card supporting more or less
> the same opengl features or with similar performance). Based on test using
> the closed source drivers from nvidia and ati and also using the opensource
> radeon dri drivers, I made a list of what extensions are available on the
> cards. Further I checked which of the extensions indicate correspond to
> certain directx versions.
> 
> Based on this information I made some directx capability checks based on
> the opengl extensions supported by the card. This is the first detection
> that is done. After this the detection is more refined. For instance in case
> of Direct3d9 all decent cards from the last 3 years support it. To select a
> card from the 'correct' generation or with similar performance I parse a
> number of renderer strings and select a close match.
> 
> Compared to the first method which I described which solely relied on the
> parsing of renderer strings this method is better because it takes into
> account the opengl capabilities of the videocard. So when a new card is out
> which isn't in our list, we won't fallback to a very basic card but can still
> return a 'close match' because of the opengl extension checks.
> 
> Regards,
> Roderick Colenbrander
> -- 
> 
> 
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-- 


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