On Wed, Dec 2, 2009 at 10:33 PM, Gerrit Voß <vo...@vossg.org> wrote:
>
> Hi,
>
> again, all for 2.x
>
> On Wed, 2009-12-02 at 13:51 -0200, Pablo Carneiro Elias wrote:
> > Hi all,
> >
> > we've recently found a small problem when using Foregrounds on a
> > viewport. The Foregrounds are not adjusted correctly when the window
> > is resized (using OSG::Window::resize()): the size gets smaller when
> > window grows and bigger when windows shrinks.
>
> Which window are you using ?
>
We're using PassiveWindow, but the testSimpleSceneManager example uses
GLUTWindow and has the same problem (pressing 'q' show statistics
foreground, which gets distorted when window is resized).
>
> > Thats the scenario: the Window resize() method, called when our window
> > is resized, schedules a resize using setResizePending( true ). The
> > isResizePending() flag is actually checked inside the doResizeGL()
> > method at OSGWindow.cpp (line 2331), which calls glViewport() is the
> > flag is true. But doResizeGL() is not called ever.
>
> correct, this is a leftover. The vieport setup is done deep inside
> the drawing backend.
>
> > A call for glViewport() is not being performed before drawing the
> > foreground, inside the render method of the viewport class.
>
> that should be ok, as long as the viewport has something to render,
> e.g. goes through the backend initialization. If not we might be
> in trouble.
>
> > The problem occurs at OSG tutorial applications as well.
>
> which one ?
>
testSimpleSceneManager program ;)
>
> > Placing a glViewport() before OSGWindow::resize() solved the problem
> > on our application.
>
> that sounds like a PassiveWindow and a PassivewViewport. Which Viewport
> are you using ? If it is a PassiveViewport, than yes the app must make
> sure that the OpenGL viewport size is correct.
>
> > We haven't sent a patch because we're not totally sure about the best
> > place to put the call to doResizeGL().
>
> it should not be needed. As said if it is an empty viewport (e.g. no
> scene) I have to think about it.
>
> kind regards,
> gerrit
>
>
>
>
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Thanks
Pablo
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