I have used OpenGL in SDL before, but I have just started to learn QT. In QT, using OpenGL is proving to be somewhat of a pain. I have the following two files: main.cpp #include <stdio.h> #...

In my application I take snapshots of a QGLWidget's contents for two purposes: Not redraw the scene all the time when only an overlay changes, using a cached pixmap instead Lat the user take scre...

I need to scale the result of glDrawPixels image. I'm drawing a 640x480 pixels image buffer with glDrawPixels in a Qt QGLWidget. I tryed to do the following in PaintGL: glScalef(windowWidth/640...

I'm using QGLWidget to draw 3-D objects, the input to my program is the faces of the shapes. Meaning that when I want to draw a cube, I got list of 6 elements each one represent a face and each fa...

All I can find is "whenever the widget needs to be painted." When is that, specifically?

I was trying to compile a Qt and OpenGL program under Code::Blocks in Ubuntu 10.04. I get the 'undefined reference to 'vtable for GLWidget' #ifndef _GLWIDGET_H #define _GLWIDGET_H #include <Qt...

I have a library proving me a QGLWidget, and the interface allow me to only to resize/set size, and control some GL animation; but no GL command is exposed outside, all i do it initialize GLWidget,...

I have a QML file which contains a layout of QML items and now I want one of those items to be a QGLWidget. i.e. I want to render to a specific QML item. Is anyone aware of how to do this?

I subclass QGLWidget and have my painting code in paintEvent instead of paintGL as I want to paint a 2D overlay using QPainter over my 3D stuff done with OpenGL. My depth buffering works fine when...

I'm designing my own augmented reality application. I have already detected the 4 corners for the patterns I'm working with. After detecting the 4 corners in a proper order I'm passing them into cv...

I'm creating a CAD-like app (Qt-based), it will be a multiple document interface and each document will contain about 5 viewports (derived from QGLWidget). As such I need my flat shader to be share...

I am new to OpenGL and Qt, and I am learning both simultaneously(3 days already:). I couple of years ago I did some exmerimenting with DirectX and I clearly remember that it was possible to make a ...

Greetings all, Does simply subclassing QGLWidget and reimplementing paintEvent() make use of OpenGL and hardware acceleration? I create a QPainter and draw QImages in this paintEvent(). What happ...

I'm starting off QT 4.6's example "OpenGL - 2D painting" It uses a subclass of QGLWidget, and makes painting operations with the class QPainter. I'd like to know how to do drawing directly with Ope...

I am trying to display HUD over my 3D game. For starters, I am just trying to display "Hello World", but I haven't had any success yet! The scene freezes / flickers once I am done. I am using Qt/C...