From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 93761] A conditional discard in a fragment shader causes no depth writing at all
Date: Mon, 18 Jan 2016 18:08:25 +0000 [thread overview]
Message-ID: <bug-93761-502@http.bugs.freedesktop.org/> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1575 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=93761
Bug ID: 93761
Summary: A conditional discard in a fragment shader causes no
depth writing at all
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: jlegg@feralinteractive.com
QA Contact: dri-devel@lists.freedesktop.org
Created attachment 121116
--> https://bugs.freedesktop.org/attachment.cgi?id=121116&action=edit
Test case
When rendering to an FBO with only a GL_DEPTH_COMPONENT16 depth buffer, with
depth testing enabled, if a fragment shader has a conditional discard, nothing
is written to the depth buffer for pixels which should not be discarded.
Platform: Fedora 22 x86_64
Mesa version: tested both git eaf7ec9 (from griever-mesa-git copr) and 10.6.9
(the default mesa package with Fedora 22). The bug occurred on both.
GL Renderer string: Gallium 0.4 on AMD PITCAIRN (DRM 2.43.0, LLVM 3.7.1)
GPU: AMD R9 270 with 2GB VRAM
Workaround: If you write to gl_FragDepth, only the intentionally discarded
pixels are discarded.
I've attached a test case demonstrating the problem. It will fail an assertion
on the machine with this bug. It should draw only on the even columns of pixels
in the depth buffer, but nothing is drawn.
--
You are receiving this mail because:
You are the assignee for the bug.
[-- Attachment #1.2: Type: text/html, Size: 2991 bytes --]
[-- Attachment #2: Type: text/plain, Size: 159 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel
next reply other threads:[~2016-01-18 18:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-18 18:08 bugzilla-daemon [this message]
2016-01-19 16:02 ` [Bug 93761] A conditional discard in a fragment shader causes no depth writing at all bugzilla-daemon
2016-01-19 20:21 ` bugzilla-daemon
2016-02-25 11:54 ` bugzilla-daemon
2016-02-25 14:11 ` bugzilla-daemon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-93761-502@http.bugs.freedesktop.org/ \
--to=bugzilla-daemon@freedesktop.org \
--cc=dri-devel@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).