glean and Piglit -- OpenGL driver testing

Henri Verbeet hverbeet at
Thu Sep 17 15:16:11 CDT 2009

2009/9/17 Saulius Krasuckas <saulius2 at>:
> Today I saw two similar projects related to OpenGL:
> [1]:
>> glean is a suite of tools for evaluating the quality of an OpenGL
>> implementation and diagnosing any problems that are discovered. glean
>> also has the ability to compare two OpenGL implementations and highlight
>> the differences between them.
> It seems be having win32 port also.
> [2]:
>> Piglit is a collection of automated tests for OpenGL implementations.
>> The goal of Piglit is to help improve the quality of open source OpenGL
>> drivers by providing developers with a simple means to perform
>> regression tests.
>> Current status is that the framework is working (though rough at the
>> edges). It contains the Glean tests, some tests adapted from Mesa as
>> well as some specific regression tests for certain bugs. HTML summaries
>> can be generated (see below), including the ability to compare different
>> test runs.
> Could these be of any use for our graphic guys -- Stefan and co.?
Well, they're mostly useful when you're maintaining an OpenGL driver.
Mesa already uses these.

> Then there is PerceptualDiff utility I found some time ago [3].  Guessed,
> could it also usefull for finding visual regressions of Wine?  Probably
> not, as it seems to be used for testing video codecs (but I may be wrong):
Possibly, but it would have to be in the context of a larger framework
like e.g. CxTest or Appinstall.

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