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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Support for SandyBridge (Gen6) is broken in 12.x and 13.x branches"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100010#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Support for SandyBridge (Gen6) is broken in 12.x and 13.x branches"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100010">bug 100010</a>
from <span class="vcard"><a class="email" href="mailto:mgorchak@qnx.com" title="mgorchak@qnx.com <mgorchak@qnx.com>"> <span class="fn">mgorchak@qnx.com</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=129987" name="attach_129987" title="High polygon count tesselation test">attachment 129987</a> <a href="attachment.cgi?id=129987&action=edit" title="High polygon count tesselation test">[details]</a></span>
High polygon count tesselation test
Similar issues could be reproduced with following small test (I hope with it
there much less efforts required to debug Mesa3D rather than using
glBenchmark).
This test is designed to be run under Screen/QNX environment, so you have to
modify gles1-teapot.c module and add there your windowing system
initialization, the rest parts are cross-platform.
This test uses GL evaluators ported to OpenGL ES 1.1 and classic teapot model
for GL evaluators. This allows to generate high polygon models in runtime for
tests.
If you run test with option -tpttess=XXX it creates data for:
80:
Vertices: 209952
Faces: 204800
100:
Vertices: 326432
Faces: 320000
120:
Vertices: 468512
Faces: 460800
125:
Vertices: 508032
Faces: 500000
127:
Vertices: 524288
Faces: 516128
all values starting from 100 kills Gen6 GPU completely.
I tested this on:
Gen6 GPU (SandyBridge) - kills GPU.
Gen7 GPUs (BayTrail, IvyBridge, Haswell) - works perfectly.
Gen8 GPU (Broadwell) - works perfectly.
Gen9 GPUs (Broxton, SkyLake) - works perfectly.</pre>
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