QGLWidget paintGL function in Qt 5.1.1 not working

cr4y88

Hello guys,

I just try to move from Qt 4.8.2 to Qt 5.1.1 today. I install the complete offline installer from Download page. Qt 5.1.1 for Windows 32-bit (MinGW 4.8, OpenGL, 666 MB).
I want to open my old project with QGLWidget on it.
But it seems I didn't work fully.

After searching I found that I can't draw primitive geometries in Qt 5.1.1

Even a simple code like this :

@
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 0.0f);
glEnd();
@

It won't work. I won't see any triangle there.

Maybe someone know how to fix this? I've been searching the forums and google. I can't find anything :(

kenchan

Are you doing it in the paint method and putting that code between these two functions?

@
painter->beginNativePainting();
...
painter->endNativePainting();
@

cr4y88

I wrote that in paintGL().

Using Qt 5.1.1 + MinGW 4.8.1 I can see the triangle but it's very big,
But if I use Qt 4.8.4 + MinGW 4.8.0 the triangle will be small.

Here are the screenshots I made :

https://www.dropbox.com/s/jsh3f66tgcw7xko/1.png -> Small WindowQt 4.8.4 + MinGW 4.8.0

https://www.dropbox.com/s/14iexplqhsadzqg/4.png -> Big Window Qt 4.8.4 + MinGW 4.8.0

https://www.dropbox.com/s/dl4zktcf19bn3fm/2.png -> Small Window Qt 5.1.1 + MinGW 4.8.1

https://www.dropbox.com/s/1gl0ugtwknrs3l9/3.png -> Big Window Qt 5.1.1 + MinGW 4.8.1

Anyone know why?

kenchan

Not sure then, I never used 4.8.1 sorry.

Are you sure you got this in your pro file?
QT += opengl

cr4y88

I did that.

I found it. It's working. It's different. It's not the same with qt 4.8.1. I read it a couple days ago

Thanks

Solved

kenchan

Glad to hear it is working for you now.