[Mesa-dev] ARB_framebuffer_no_attachments for llvm and soft pipes

[Roland Scheidegger]

Am 10.04.2016 um 09:41 schrieb Edward O'Callaghan:
> All the piglits pass for these two as-is. However, some of the piglits
> require SSBO support to run, although I can't see why anything would
> actually fail but I thought I would make note of it just in case someone
> felt this patch should be held back till SSBO support is in both pipe
> drivers? If not, we should be golden to flick these on too.
> 
> Edward O'Callaghan (1):
>   llvmpipe,softpipe: Enable ARB_framebuffer_no_attachments


I'm not sure this is really a good idea (at least for llvmpipe). At
least the number of layers used internally is wrong (fb_max_layer is
going to be ~0 as it is always derived from the attached buffrs). I
suppose though it might not actually matter. But I'm not sure if there's
really any point in this extension without images - while I initially
thought it wouldn't be able to do anything this isn't quite true as
there is indeed one side effect of fs possible even without images,
which is query results (such as occlusion queries, which is what piglit
uses).
I think though just about all practical use cases really would require
image support, so I'm not convinced exposing this just because we can is
worth it. But OTOH why not...

Reviewed-by: Roland Scheidegger <sroland at vmware.com>