<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Rendering issues with geometry shader"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91780">91780</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Rendering issues with geometry shader
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/Gallium/r600
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jonas@wielicki.name
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=117951" name="attach_117951" title="apitrace which shows the problem">attachment 117951</a> <a href="attachment.cgi?id=117951&action=edit" title="apitrace which shows the problem">[details]</a></span>
apitrace which shows the problem
In the attached apitrace, *sometimes* (about 50% of the runs) rendering issues
can be observed. They manifest in appearantly missing geometry (compare
attached screenshot; the UI has been disabled for taking the apitrace).
Steps to reproduce:
1. DRI_PRIME=1 apitrace replay r600-renderbug-noui.trace
2. If step 1 did not show the behaviour, retry a few times.
Expected results:
Rendering should work and show a terrain without holes
Actual results:
Holes in the terrain
The results have been observed on mesa-11.0.0-rc1 with and without
<a href="http://lists.freedesktop.org/archives/mesa-dev/2015-August/092766.html">http://lists.freedesktop.org/archives/mesa-dev/2015-August/092766.html</a> applied.
The same code has never (in 50+ tests) shown the issue on the Intel integrated
GPU.
The application which produces the given behaviour can be found at
<a href="https://github.com/horazont/scc/tree/f31d90e1579ebda14ce7a0417339b2cd448efde8">https://github.com/horazont/scc/tree/f31d90e1579ebda14ce7a0417339b2cd448efde8</a>
The geometry shader is in:
<a href="https://github.com/horazont/scc/blob/f31d90e1579ebda14ce7a0417339b2cd448efde8/game/resources/shaders/terrain/main.geom">https://github.com/horazont/scc/blob/f31d90e1579ebda14ce7a0417339b2cd448efde8/game/resources/shaders/terrain/main.geom</a>
The usage is in:
<a href="https://github.com/horazont/scc/blob/f31d90e1579ebda14ce7a0417339b2cd448efde8/libffengine-render/src/render/fancyterrain.cpp">https://github.com/horazont/scc/blob/f31d90e1579ebda14ce7a0417339b2cd448efde8/libffengine-render/src/render/fancyterrain.cpp</a>
(search for draw_elements, GL_GEOMETRY_SHADER, GL_LINES_ADJACENCY)
In another commit, the geometry shader has been disabled
(<<a href="https://github.com/horazont/scc/commit/4e1e298b02723efcf6555c1c4a7efa31682cf79b">https://github.com/horazont/scc/commit/4e1e298b02723efcf6555c1c4a7efa31682cf79b</a>>),
which appears to fix the problem or make it very hard to reproduce.
radeon GPU:
Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD
6630M/6650M/6750M/7670M/7690M] (rev ff) {6630M according to notebook specs}
intel GPU:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller (rev 09)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>