[Bug 97305] Wrong values returned by GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT & GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT randomly breaks stuff

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=97305

--- Comment #11 from Ilia Mirkin <imirkin@alum.mit.edu> ---
(In reply to Marek Olšák from comment #10)
> (In reply to Ilia Mirkin from comment #9)
> > (In reply to Marek Olšák from comment #5)
> > > Pre-GCN cards require an alignment of 256 bytes for uniform buffers. GCN
> > > cards only require 4 byte alignment there.
> > > 
> > > All other buffer binding points require 1, 2, or 4 bytes depending on the
> > > texel size. It's really min(texel_size, 4).
> > 
> > That means that you have to return max(texel_size) for the
> > GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT. You only get one cap, and a texture
> > buffer can be any offset.
> 
> That's what we already do.

You return 4. However that's not enough if I set the format to GL_RGBA32I.
There's no provision in the spec to disallow someone feeding you a aligned-to-4
buffer with GL_RGBA32I format if you return "4" as the value.

Oh, unless I totally misunderstood what you were saying, and that situation
should work. In which case, apologies for the noise.

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