[Mesa-dev] [Bug 68296] Using old viewport value after a window resize (content is clipped)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68296

--- Comment #13 from Michel Dänzer <michel at daenzer.net> ---
(In reply to comment #12)
> If then you add a glClear(GL_COLOR_BUFFER_BIT) after the call to
> glViewport(...), then the problem goes away.
> 
> The question is, is it the responsibility of the GL client program to make a
> call to glClear after executing glViewport, [...]

It is, if the GL client program wants the new viewport size to be filled with
the clear colour.

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