Bug 29272 - osmesa 7.8.2 - assertion error drawing thin line with CHAN_BITS=32
Summary: osmesa 7.8.2 - assertion error drawing thin line with CHAN_BITS=32
Status: RESOLVED INVALID
Alias: None
Product: Mesa
Classification: Unclassified
Component: Mesa core (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: mesa-dev
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Reported: 2010-07-27 06:08 UTC by rkww
Modified: 2016-02-13 09:34 UTC (History)
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Description rkww 2010-07-27 06:08:19 UTC 
The attached program shows a simple thin line painted with an unitialized value (usually infinity).

(OSMesa 7.8.2 built with configs/linux-osmesa32 plus -DUSE_MGL_NAMESPACE)

A debug build (linux-x86-64-debug with "-DUSE_MGL_NAMESPACE -DCHAN_BITS=32 -DDEFAULT_SOFTWARE_DEPTH_BITS=31") yields:

a.out: swrast/s_span.c:1173: _swrast_write_rgba_span: Assertion `span->arrayMask & 0x01' failed.

Enabling the depth buffer causes the line to be painted correctly.
Comment 1 Timothy Arceri 2016-02-13 09:34:11 UTC 
The example program wasn't attached to the bug so not a lot that can be done so closing.

Feel free to test against a more recent version of Mesa and reopen adding the example if still an issue.

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