[PATCH xserver 2/2] glx: Fix visual fbconfig matching with respect to swap method

[Fredrik Höglund]

On Wednesday 06 September 2017, Thomas Hellstrom wrote:
> For the built in visuals, we'd typically select the "best" fbconfig
> without considering the swap method. If the client then requests a
> specific swap method, say GLX_SWAP_COPY_OML, it may well happen that the
> first fbconfig matching requirements would have been paired with the 32-bit
> compositing visual, and the client would render a potentially transparent
> window.

Hi Thomas,

Unfortunately this patch breaks GL applications that actually want the
ARGB visual. They now end up using a visual that does not have an
alpha channel. In addition, it breaks compositing of ARGB windows,
at least in kwin.

Fredrik