Hello Simon,
On 09/26/2011 08:35 PM, Simon Bouvier-Zappa wrote:
> We are using several instances of OSG::PassiveWindow in our application
> to handle our several opengl widgets which all use a shared opengl context.
>
> For a single 3d object, we are using one scene graph for all widgets.
> When we do the rendering however, it seems to create double the textures
> and double the display lists for the same object in two different
> views. I would have thought that OSG::Window::validateGLobject would
> have reused the same opengl id for the same context. Is this validation
> window dependent ?
OpenSG windows essentially represent OpenGL contexts, so each window
instance is considered to be a different context. Can you use the same
PassiveWindow for all widgets so that OpenSG is made aware that it
really is only dealing with a single shared GL context?
> Also, as a side effect of this first issue, we are noticing that every
> opengl texture as well as opengl display list is not getting destroyed
> when closing a particular widget (and destroying its specific
> OSG::PassiveWindow). Is there some way to enforce clean up of opengl ids ?
the basic problem is that when the window is destroyed there is in
general no guarantee that the OpenGL context is active (to make calls
like glDeleteTextures()), so OpenSG only decrements the ref count on the
internal object that represents an OpenGL resource. In the assumed setup
where a window corresponds to a GL context this is not a big problem
since all GL resources associated with the context are freed when the
context itself is destroyed - in your current setup that does not quite
work because you have multiple window instances representing the same GL
context. Therefore switching to a single window per context should solve
this problem as well.
Cheers,
Carsten
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