Thanks for the quick answer.
I'm using OSG 2.8.3 with osgOcean.
The 3D views are embedded in an existing MOTIF application which I cannot
modify. Instead, this application calls my library with the widget that I need
to draw on.
I use XDisplay(Widget w) to get the screen for each widget (5 widgets per
screen).
The integration is done with the GLw library.
I have a class that defines the scene and contains an instance of
osgViewer::Viewer with its own Camera.
The initialization is something like this (simplified) :
Code:
void initialize(Widget w)
{
// Create our scene
Scene s = new Scene;
// Get the display associated with the widget
Display* dpy = XDisplay(w);
osgViewer::Viewer viewer = scene->getViewer();
osgViewer::GraphicsWindowEmbedded gfx =
viewer->setUpViewerAsEmbeddedInWindow(w.core.x, w.core.y, w.core.width,
w.core.height);
// Build a XVisualInfo object from the traits and the display
XVisualInfo* info = createVisualInfo(dpy,
viewer->getCamera()->getGraphicsContext()->getTraits());
XtSetArg(argsGL[0], (char*) GLwNvisualInfo, info);
// Create the GLX Context for the active display
GLXContext glxContext = glXCreateContext(dpy, info, 0, GL_TRUE);
viewer->realize();
gfx->realize();
// One per widget
Widget drawArea = GLwCreateMDrawingArea(w, (char*) "View", argsGL, 1);
XtManageChild(drawArea);
}
The rendering is done in a scheduled method (every 40ms). It can be simplified
as the following:
Code:
void draw(Widget w)
{
// Wait for pending X operations before rendering
glXWaitX();
// Activate current context
GLwDrawingAreaMakeCurrent(w, glxContext);
// Computes the new projection
[...]
viewer->getCamera()->setProjectionMatrixAsPerspective(...);
gfx->resized(0, 0, w.core.width, w.core.height);
// Render to buffer
viewer->frame();
GLwDrawingAreaSwapBuffers(w);
}
For each screen, there's 5 widgets, 5 drawArea of various sizes, but only one
scene, one glxContext. The method draw is called for each widget as long as the
widget is visible (at most, 4 are visible on a screen).
There's no issue with only one screen, no flickering. But with a second screen
it's a mess. With only one glxContext, nothing shows up on the second screen.
When I add a second context and duplicate most of the objects, flickering
starts and I get a lot of "invalid operations" in the trace.
This is where I am stuck for now...
Cheers,
Vincent
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=40417#40417
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