Hi,
On Mon, 2009-06-22 at 14:29 +0200, Andreas Halm wrote:
> Hi,
>
> I found the problem.
>
> > hmm interesting it's stuck while logging. But nothing really indicates
> > why, it does not look like a loop, more like a lock or barrier. And it
> > is outside any OpenSG loop and also does not seem to hit OpenSG the
> > lock inside Log. Hmm, I'll have to think about it a little.
>
> This was because wglMakeCurrent failed in WIN32Window::doActivate and
> therefore glGetError always returns an error in Window::doFrameExit -
> calling glGetError without a valid context is illegal. Therefore it never
> left the while loop in OSGWindow.cpp line 1527.
>
> So now to why a call to wglMakeCurrent could possibly fail: My window class
> did not have the CS_OWNDC flag set, so every call to GetDC() might return a
> different, new handle.
Using CS_OWNDC for OpenGL windows is strongly recommended as as far as I
remember from general OpenGL discussions, some drivers might not work
without it. I'll see if we can find a way to query for that so we can
warn if it is missing. Is there a reason why you would not want to set
it ?
> The handle that I set using WIN32Window::setHdc was
> correct, however OpenSG does overwrite it in WIN32Window::init
> (OSGWIN32Window.cpp line 116) which is obviously not the way to do it
> (otherwise the setHdc method is useless).
>
> I would prefer init() something like:
>
> {
> bool we_used_getdc = false;
> if (getHdc() == NULL) {
> setHdc(GetDC(getHwnd()));
> we_used_getdc = true;
> }
>
> if(getHglrc() == NULL )
> {
> setHglrc(wglCreateContext(getHdc()));
>
> if(getHglrc() == NULL)
> {
> std::cerr << "WIN32Window::init: failed: "
> << GetLastError()
> << std::endl;
> }
> }
>
> if (we_used_getdc)
> ReleaseDC(getHwnd(), getHdc());
>
> this->doActivate();
>
> Inherited::init(oFunc);
>
> this->doDeactivate();
> }
>
> At least my application starts now and crashes later ...
this is only half the part, doRelease also contains a ReleaseDC with
no matching getDC in doActivate, so that too will fail without CS_OWNDC
set.
kind regards,
gerrit
------------------------------------------------------------------------------
Are you an open source citizen? Join us for the Open Source Bridge conference!
Portland, OR, June 17-19. Two days of sessions, one day of unconference: $250.
Need another reason to go? 24-hour hacker lounge. Register today!
http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org
_______________________________________________
Opensg-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/opensg-users
