[Bug 793997] gl: GBM backend fixes

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793997

--- Comment #3 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
(In reply to Daniel Stone from comment #1)
> Daniel Stone 2018-03-02 16:30:35 UTC
> Sorry for chiming in so late here.
> 
> Firstly, get_{depth,bpp}_from_format are wrong. There is a very very small
> and fixed depth/bpp -> format mapping inside the kernel, which is pretty
> much:
>   * 8/8 -> C8
>   * 15/16 -> XRGB1555
>   * 16/16 -> RGB565
>   * 24/24 -> RGB888
>   * 24/32 -> XRGB8888
>   * 30/32 -> XRGB2101010
>   * 32/32 -> ARGB8888
> 
> Anything else will silently be assumed to be XRGB8888.

Is this also true for RGB332, BGR233, and NV12 ?

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