Qt 5.9, OpenGL, mesa libraries - black screen

Dino

Hello everybody,

I have finally successfully compiled a Qt app (C++) using OpenGL on a CentOS 7 machine. The application was originally developed for Windows.

I have an OpenGL scene that is showing a black screen. It works if I compile the project with the Windows version of Qt in a Windows environment.

All controls and functionalities are working except I cannot see the result on the OpenGL scene.

I am using the Mesa libraries on a CentOS system:

glxinfo | grep vendor
server glx vendor string: SGI
client glx vendor string: Mesa Project and SGI
OpenGL vendor string: VMware, Inc.

and I can see the that 3D acceleration is on:

glxinfo | grep rendering
direct rendering: Yes

Any idea?

Thank you for your help,

Dino

mrjj

Hi
Can you run glgears or any other openGL app ?

Have you tried outside of virtual machine?

Dino

Hi mrjj,

the glxgears works:

[dcappiello@localhost ~]$ glxgears
2423 frames in 5.0 seconds = 484.186 FPS
2579 frames in 5.0 seconds = 515.722 FPS
2718 frames in 5.0 seconds = 543.542 FPS
2176 frames in 5.0 seconds = 435.088 FPS

mrjj

@Dino
Hi
Ok so at least some openGL is available
Maybe its the shader revision.

Do you run it in Creator or outside ?

Also does the
OpenGL Window Example
run ?

Dino

I am running my project inside the Creator.

I can confirm that the OpenGL Window Example is not working, I am getting the following error:

Project ERROR: Unknown module(s) in QT: axserver

You are on something :)

Dino

Sorry, ignore my previous comment.

I was running the OpenGL Example (ActiveQt).

The project OpenGL Window Example Works.

I can use it to compare with my project to see what is different.

I will keep you posted.

Dino

Dino

Hi everybody,

I found what the problem was. My application needs OpenGL 4. The problem is that I was running and testing my app on a VirtualBox machine that cannot use my computer graphic card. Unfortunately, I will need to install Qt and app on a proper CentOS 7 machine. MRJJ, thank you for your help. Dino

mrjj

@Dino
Hi
The OpenGL drivers in the VirtualBox Guest Additions are limited to OpenGL 2.1. as far as i know.