about video memory detection in wine
Sunny.Sun at amd.com
Sat Aug 15 02:25:27 CDT 2009
Here I just want to tell you that if a user uses an old driver that we don't support querying total memory will lead to vidmem = 0, that is unexpected, so we should have a check.
It doesn't matter that the total memory is not documented, as long as it can tell you the true value.
And for the old card that doesn't support ATI_meminfo can still go the fall back path.
I think the biggest benefit from using this extension is that you don't have to update the vidmem list for newly realeased ATI cards, and you can get the correct amount of video memory for the same render string but with different video memory (eg: HD4870 may have 1GB memory or only 512MB memory)
From: Stefan Dösinger [mailto:stefandoesinger at gmx.at]
Sent: Saturday, August 15, 2009 12:31 AM
To: Sun, Sunny
Cc: Roderick Colenbrander; wine-devel at winehq.org
Subject: Re: about video memory detection in wine
Am Friday 14 August 2009 18:01:07 schrieb Sun, Sunny:
> + if(gl_info->vidmem < 64 * 1024 * 1024)
> + gl_info->vidmem = 64 * 1024 * 1024;
I guess the idea is that no ATI card that was ever supported on fglrx has less
than 64 mb of memory? My old radeon 9000, which isn't supported by fglrx
since years now has 64 MB. Does this hold true for radeon 8500 cards too?
I think I'll use the guessed amount of vidmem in this case instead of
hardcoding 64 MB.
Using the undocumented value and the check for older drivers which don't
support it is a bit hacky, but its a well-isolated hack and avoids a lot of
problems, so it should be ok.
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