OpenGL question

[^NyAw^]

Hi,

I use Queued connections. I connect the signal of the Threads to the main Thread. When the main thread recives the signal it calls "showImage" from the QGLWidgets.

I think that I found the problem. Showing images is now working well(Thanks), but, the Thread also uses image algorithms to do some jobs. Here is the problem. The libraries could not be thread safe and so if I'm calling the same function on two different threads it could crash.

For the algorithm of showing images, thanks another time. I'm new to OpenGL and this is the only way that I found to show images. If there is a better way to do this, please tell me how to do this.

Thanks,

[jacek]

I'm new to OpenGL and this is the only way that I found to show images. If there is a better way to do this, please tell me how to do this.

I would do all of the drawing in paintGL(), because you can't tell when you need the repaint. For example the user might move some other window over your one.

showImage() should only to store the updated image data in some member variable and schedule the update using updateGL(). This way you have clear separation of concerns.

What do you do exactly with the image in your threads? Do you use OpenGL there?

[^NyAw^]

Hi,

I would do all of the drawing in paintGL(), because you can't tell when you need the repaint. For example the user might move some other window over your one.

Yes, but this is no problem. Think that when an image is captured by the camera it have to be displayed. It's what I'm doing(my purpose)

What do you do exactly with the image in your threads? Do you use OpenGL there?

The Threads are how capture the image from the camera. One thread per camera. I don't use OpenGL there. I use a QueuedConnection to tell the Main Thread that can display an image and it do it with the OpenGL widget.

That's all. It's now working ok. I have looked at raster images on OpenGL but I think that mapping textures will be faster.

Thanks,