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0003995

ParaView

(No Category)

public

2006-10-27 18:59

2006-11-08 16:00

Reporter

Clinton Stimpson

Assigned To

Berk Geveci

Priority

high

Severity

major

Reproducibility

always

Status

closed

Resolution

no change required

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Summary

0003995: glReadPixels on X11 sometimes returns wrong pixels

Description

So I tracked down the reason why I didn't turn image caching on in the QVTKWidget yet.

glReadPixels() is returning the wrong pixel data.

glXSwapBuffers() is called, then the next gl/glx call is glReadPixels().
Apparently, glXSwapBuffers() doesn't really happen in time for glReadPixels() to be called (client/server X11 involved).

If I add a call to glXWaitX() or glXWaitGL() before the call to glReadPixels() I get the correct pixel data.

I'm not sure where the right place is to make this gl/glx synchronization happen.

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Notes
(0005681) Clinton Stimpson (developer) 2006-11-08 15:52	Actually, let me re-confirm this. Image caching in the QVTKWidget doesn't work right. And that's probably what I saw.

Issue History
Date Modified	Username	Field	Change
2011-06-16 13:10	Zack Galbreath	Category	=> (No Category)