Textures + Multiple QGLWidgets

[KShots]

Hmm... if that's really all you're doing, I think you're going about it in the wrong way. When you subclass QGLWidget, note that there are multiple constructors available. Specifically, there is a pointer to a "shareWidget" (docs) in all the constructors. What you do is have a central QGLWidget to pass to all your other QGLWidget sub-classes which will share texture memory and display lists.

In my case, I created what I call a "hidden viewport" - Basically a viewport that always exists (even if there are no visible OpenGL widgets in existence) whose only purpose is to be the place to centrally store all the textures and display lists and share them out to the other widgets. Just pass a pointer to this widget right after you give a parent to your GLWidget and you should be set. Here's a short example:

QGLWidget * hiddenViewPort = new QGLWidget(this);
myViewPort * mvp = new myViewPort(this, hiddenViewPort);

QGLWidget * hiddenViewPort = new QGLWidget(this);
myViewPort * mvp = new myViewPort(this, hiddenViewPort);

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Now all the textures and display lists are shared between these viewports. Do the same with any future viewports and you should be set. Just be careful that they have compatible formats (see the docs link above).

[jp-deivis]

Let me see if I understand your suggest and say what I understand of Qt & GL.

As I see, when I load my texture to the texture memory, it becomes available to the first QGLWidget what is created, and for that reason the others widgets can't access to the memory texture as the first one does, right?

What you propose is to create a first GLWidget with that "privilege" of accessing the texture memory and passes it as the shareWidget parameter to the others widgets (which displays some stuff) and to share with them that "privilege", right?

Following what you posted, I did this:

QGLWidget *central = new QGLWidget(this);
    . . .
wVolume = new Rendering(mainWidget, central);
wPlane1 = new Rendering(frame1, central);
wplane2 = new Rendering(fram2, central);
    . . .

QGLWidget *central = new QGLWidget(this);
    . . .
wVolume = new Rendering(mainWidget, central);
wPlane1 = new Rendering(frame1, central);
wplane2 = new Rendering(fram2, central);
    . . .

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where mainWidget is the main window of my app, and frame1 and frame2 contain wPlane1 and wPlane2 respectively.

[jp-deivis]

I started a new thread (before find this one). It is "Share a 3D texture in four QGLWidgets" where there is more information about the problem. Can you move to that thread? There are already some replies.

[KShots]

I'm posting further replies in the topic you mentioned