[Bug 93676] [BDW] Bad blit from FBO to FRONT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93676

--- Comment #10 from Clive McCarthy <CliveMcCarthy at gmail.com> ---
Thank you for working so hard on this issue. The FBO blitting turns out to be a
red herring.

My fragment shader is 'odd' in that is has large switch statement. This has
caused the linking time to be rather long as reported in bug #91857
and, to my surprise, it also causes the artifacts I reported here and in bug
#110424

I created a sample application (attached to #110424) that illustrates the
problem. I'm afraid it will be troublesome to build, though it is a regular GCC
build, but it is possible to reproduce the artifacts with it.

The fragment shader's case statement has a #if ... #endif section that will
enable/disable the artifact problem.

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