https://bugs.freedesktop.org/show_bug.cgi?id=109330
--- Comment #6 from Daniel Stone <[email protected]> ---
Yeah, I think it's reasonable. The render target is XRGB8888, and X really does
mean undefined, including 'throw content away on render' and 'invent fake
content on sample'.
I'd suggest allocating the gbm_surface as GBM_SURFACE_ARGB8888, then taking
those BOs and passing DRM_FORMAT_XRGB8888 to AddFB2. This is totally safe to
do, and will ensure that drivers preserve the alpha channel when you write out.
(I was going to say about matching EGL_NATIVE_VISUAL_ID as well given your
short example, but you already do that properly - nice!)
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