7/6 WineD3D: CheckDeviceFormat srgb write support

[Roderick Colenbrander]

> > Hi,
> >
> > This patch adds srgb write support to CheckDeviceFormat. Before we
> > implicitly allowed it. Stefan said that we offer it using ARB/GLSL
> shaders
> > when the format is X8R8G8B8 or A8R8G8B8.
> Ah, looks like you were faster than I was with replying :-)
> 
> Did you check which formats offer srgb writing on Windows? Our pixel
> shader 
> code offers it for all formats, although srgb correction is pretty
> pointless 
> on float buffers
> 

The geforce7/8 offer it on R5G6B5 and the *8R8G8B8 formats. Not sure about ati or intel but I think ati at least offers it on 32bit formats.

Roderick
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