Hi,
On Mon, 2009-12-07 at 13:34 +0100, Daniel Weber wrote:
> Hi all,
>
> I try to combine some OpenGL functionality with OpenSG. After some time, I
> found out that glGetError didn't return "no_error".
> A slight modification of the sample 01hello.cpp (in Examples/Simple)
> [SNIP]
> int main(int argc, char **argv)
> {
> // OSG init
> OSG::osgInit(argc,argv);
>
> // GLUT init
> int winid = setupGLUT(&argc, argv);
>
> // open a new scope, because the pointers gwin and scene below should
> // go out of scope before entering glutMainLoop.
> // Otherwise OpenSG will complain about objects being alive after
> shutdown.
> {
> // the connection between GLUT and OpenSG
> OSG::GLUTWindowRefPtr gwin = OSG::GLUTWindow::create();
> gwin->setGlutId(winid);
> GLenum err;
> err= glGetError();
> std::cout << gluErrorString(err) << std::endl;
> gwin->init();
> err = glGetError();
> std::cout << gluErrorString(err) << std::endl;
>
>
> // create the scene
> OSG::NodeRefPtr scene = OSG::makeTorus(.5, 2, 16, 16);
>
> OSG::commitChanges();
> [SNAP]
> leads to the output:
>
> no error
> invalid operation
>
> I started debugging GLUTWindow, but I got lost. Anyone an idea?
>
yes, the context is not active anymore after gwin->init();
Hence you call glGetError without a context. If you want to
have the context bound for the app you must explicitly call
gwin->activate() after gwin->init()
kind regards,
gerrit
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