Re: [fltk.opengl] Fl_Gl_Window flashes on context creation (Windows7)

2013-04-10 Thread Ivan Nedrehagen

  I use a Dell precision

   What does this means in terms of the graphics card?
   Those specifics are probably useful to help replicate.

   I don't have any dell equipment here (though one of the other
   devs might), but depending on the graphics, that might help
   zero it in.


That means a NVIDIA Quadro FX 880M graphics card

  I am wondering about the drivers also, but I cannot say for sure. I did 
  upgrade my drivers before posting just to make sure, but still it is 
  strange that I cannot see this behaviour on any other opengl program.
  I did download and compile freeglut, their demos run smooth without any 
  problems.

   I see.

   Well, you could open an STR with all the details we've found to date.

   It's going to be a problem though if the devs can't replicate.

   If you're able to identify the issue, supply a patch, or at least let us
   know what changes the problem if you try messing around with the FLTK 
 innards.
   You may find something in the FLTK opengl win32 initialization code that
   needs adjusting.


I also suspect that there might be problems replicating this bug, so I will try 
to do some digging of my own. Since I have built the FLTK library on my own, I 
might tinker a bit with the source and might run a strace (or windows equiv.) 
on the glut demos and the fltk demos to see if there might be a difference.

   You might try tweaking the freeglut examples to enable features FLTK is
   enabling (double buffer mode, etc) to see if you can perhaps replicate
   the problem outside FLTK, to see if it's a particular opengl feature 
 causing
   the problem.

This will be the first Ill be checking. I'll get back when I have some results.

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Re: [fltk.opengl] Fl_Gl_Window flashes on context creation (Windows7)

2013-04-10 Thread Greg Ercolano
On 04/09/13 23:24, Ivan Nedrehagen wrote:
 I also suspect that there might be problems replicating this bug, so I will 
 try to do some digging of my own. Since I have built the FLTK library on my 
 own, I might tinker a bit with the source and might run a strace (or windows 
 equiv.) on the glut demos and the fltk demos to see if there might be a 
 difference.

Yes, strace might be good, and also I think there's a way to view
the X11 messages going back and forth.. It might be as easy as setting
an environment variable, or attaching a program to the process or some 
such..
can't remember.

Sometimes just running the app through a remote xsession would let you
sniff the X11 network messages (ethereal, or wireshark, or whatever its
called these days which sniffs network packets and deconstructs them at
the protocol level into meaningful messages. Used this once to solve an 
STR
a few years ago where our code was creating zero sized windows IIRC)

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