QGLContext problems

[bhuang]

I use the GLWidget class from the hellogl sample.

In initializeGL(), I want to access the current QGLContext and call makeCurrent(), doneCurrent() to make it available to other rendering threads and make it unavailable to current thread.

To do this, I call QGLContext::currentContext(). But the return type is a const* pointer, hence I can't call QGLContext::doneCurrent().

If I instead create my own context via
QGLContext* p = new QGLContext( QGLFormat::defaultFormat() );
bool result = p->create();

result is always 0. Same with other ways to construct QGLFormat.

Thanks

[przemo_li]

From Qt 4.6 docs:

void QGLContext::doneCurrent ()   [virtual]
Makes no GL context the current context. Normally, you do not need to call this function; QGLContext calls it as necessary.

void QGLContext::doneCurrent ()   [virtual]
Makes no GL context the current context. Normally, you do not need to call this function; QGLContext calls it as necessary.

To copy to clipboard, switch view to plain text mode 

Problem is multiple threads accesing one GLWindget? QGLContext is not thread safe. Use other means of syncing and then use only QGLContext::makeCurent()
it should do.