[Mesa-dev] [Mesa-stable] [PATCH v2 2/5] meta: fix meta clear of layered framebuffers

Paul Berry stereotype441 at gmail.com
Sat Nov 23 15:21:16 PST 2013

On 23 November 2013 12:58, Ian Romanick <idr at freedesktop.org> wrote:

> On 11/20/2013 02:29 PM, Paul Berry wrote:
> >>From section 4.4.7 (Layered Framebuffers) of the GLSL 3.2 spec:
> >
> >     When the Clear or ClearBuffer* commands are used to clear a
> >     layered framebuffer attachment, all layers of the attachment are
> >     cleared.
> >
> > This patch fixes meta clears to properly clear all layers of a layered
> > framebuffer attachment.  We accomplish this by adding a geometry
> > shader to the meta clear program which sets gl_Layer to a uniform
> > value.  When clearing a layered framebuffer, we execute in a loop,
> > setting the uniform to point to each layer in turn.
> >
> > Cc: "10.0" <mesa-stable at lists.freedesktop.org>
> The previous version of this patch was NAKed by you because it made
> https://bugs.freedesktop.org/show_bug.cgi?id=71870 worse.  Is that now
> fixed by this version?  I didn't notice any mention of the issue...

No, no version of this patch was ever NAKed.  The only difference between
v1 and v2 of the patch was that I had to make some minor adjustments to
reflect the changes I made in v2 of patch 1/5 ("mesa: Track number of
layers in layered framebuffers").  (That's why the patch doesn't have a
"v2" annotation in the commit message--the adjustments were too minor to be
worth mentioning).

It was only after I committed this patch that Tapani discovered that it
made bug 71870 worse.  I am still awaiting additional information from
Tapani so that I can reproduce the bug and track it down.

I tried to clarify the situation in
 What I said there still stands: I believe patches 1, 3, 4, and 5 are safe
to cherry pick to 10.0*.  Patch 2 definitely should be not be cherry-picked
to 10.0 until we figure out what's going on with bug 71870.

*However, if you wanted to err on the safe side and keep the entire patch
series out of 10.0 until we have more information, that would be
understandable too.
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