Bug#947196: "BadMatch" error on X_ShmPutImage when using GLX_ALPHA_SIZE
On 24.12.2019 12.22, Kristian Nielsen wrote:
> This patch to openscad works around the problem:
>
> https://salsa.debian.org/knielsen-guest/openscad/commit/7225800b534a36e5ad84c56c274889b8d0edc0ce
>
> It uses Xrender to query visuals returned from glXChooseFBConfig(), and
> filter out those with alphaMask=0.
>
> With this patch, all openscad tests are passing with mesa 19.3.1-2.
>
> However, I'm unsure if this is the correct approach? It does not seem right
> that querying Xrender would be required just to specify GLX_ALPHA_SIZE to
> glXChooseFBConfig(). Maybe there is a simpler fix for openscad, or possibly
> this is a bug in mesa that should be fixed?
>
> - Kristian.
File it to mesa upstream to find out if it's their bug or not. But in
the meantime a workaround in the test might be needed.
--
t
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