OpenGLContext and visible true/false
lazarus / 39-Graphics

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Ocye · 2010-08-17 09:29

With one of the latest updates OpenGLContext seems to have changed.
When I create the context on a hidden parent the content is
black/white on making it visible. This was an issue for older releases
when the parent was changed. What can I do?

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felipemdc · 2010-08-18 09:50

This should be reported in the bug tracker and noted as a regression. 
It would also really help if you can find which exact revision broke
this. Read more here:

http://wiki.lazarus.freepascal.org/How_To_Help_Developing_Lazarus#Deal
ing_with_regressions

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Ocye · 2010-08-18 10:57

Stupid error, as always 
A simple application for the bug tracker worked well so I checked the
code again. The problem was that I had implemented a method Repaint()
for the glcontrol. Of course this was not a good idea since
TOpenGLControl is derived from TWinControl. Now, I placed the code in
OnPaint and call simply Invalidate. I don't know why it worked prior
the update.
The phenomenon with black/white output persists when I change the
parent. I create the GLControl for a TPanel and move (parent:=newform)
the panel with all controls into a new form (or back to mainform).
It's a crude approach so I don't post it at the bugtracker. Probably
it's my failure again.