[Bug 76396] [IVB/HSW] ogl-samples: gl-320-fbo-depth-multisample render error (broken line at "horizon")

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76396

--- Comment #6 from Alejandro Piñeiro (freenode IRC: apinheiro) <apinheiro at igalia.com> ---
Ok, so after some time checking this, this is what I found.

I was been looking to the public PRM and the code, and I didn't find anything
wrong.

So then I moved to see what piglit was reporting on this case. Although all the
hiz tests are properly passing on HSW, the test for this case (depth
multisample) on tests/spec/arb_texture_multisample is failing. If someone are
interested to run it:

./bin/arb_texture_multisample-sample-depth -auto -fbo

Worth to note that is the only test of that spec failing on HSW. 

Taking a look to the commit message of that test:

 commit ecf0faa4d71c0e117569c6e0edfe57b2f8bbabf7
 Author: Chris Forbes <chrisf at ijw.co.nz>
 Date:   Sat Feb 8 16:06:41 2014 +1300

    arb_texture_multisample: add test for sampling from depth

    This demonstrates an i965 bug, where hiz resolves for MSAA surfaces
    don't work (on BLORP platforms).

    Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
    Reviewed-by: Glenn Kennard <glenn.kennard at gmail.com>

The commit message seems to suggest that this is a hw limitation. In any case
it is not 100% explicit (other option would be that it is mentioning a bug on
the driver). Will try to ask on IRC about that.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-3d-bugs/attachments/20160205/d68bed93/attachment.html>