Qt5.12.9: Example:OpenGL/Cube doesnt work

DaJose

Hello,

does anybody know why the example Cube in OpenGL doesnt work? I am getting only a black screen.

SGaist

Hi,

Which OS ?
Which driver ?
Which graphics card ?
Do other OpenGL examples run properly ?

DaJose

Hi,

thanks for your response.

OS: Windows 10
Which driver: what you mean?
Which Graphic card: AMD Radeon RX 5600 XT
Do other OpenGL examples run: I can draw a Quad by using simply vertices. But it comes together with an IndexBuffer it doesn't work. So I tried to run the cube example what comes with IndexBuffer => only black screen
So its my goal to render a simple quad by using IndexBuffer

SGaist

@DaJose said in Qt5.12.9: Example:OpenGL/Cube doesnt work:

Which driver: what you mean?

The version of the driver of your card. If too old, it might break, sometimes, too new will as well.

DaJose

Okay, I try to look for the newest. But I think I've got the latest driver.

So, I've installed the new driver but nothing changed. I only get a black screen

I' am using Visual Studio (c++) 2017

btw:
I only can answer after 10minutes :(

No Error messages...

SGaist

Any error message ?

DaJose

No error message.

BTW:
I can only answer after 10 minutes... that sucks a little bit :/

SGaist

Do the QWindow related examples work ?

DaJose

Yes, this works:
You mean the QOpenglwindow example from the OpenGL examples?

alt text

https://imgur.com/a/ce9DWX0

SGaist

One thing that is missing from the example is printing errors in case something goes wrong in the initShaders method. I would add some debugging information there.

DaJose

No error while compiling or linking or reading the shaders

DaJose

Maybe you got a simple VC 20017 project rendering something using IndexBuffer?
Maybe something is wrong with the settings...

Or I send you my project?

I have made a release and try to run it on another PC with the same result: just a blank black screen...

DaJose

Update/Edit:
Now I've tested the Cube-Example with Qt Version 5.9.7 => it works!!

It seems that Qt version 5.12. got a Bug when using IndexBuffer or something!!!

SGaist

Then test a more recent version to see if it's working better.

DaJose

Sure. But I use the precompiled version (Offline-Installer) and do not compile the source code. And Qt 5.12.9 is the latest release :/

SGaist

Do you mean latest version of the offline installer ? IIRC, it should rather be 5.14.

DaJose

Can you give me the link?
I only found this: https://www.qt.io/offline-installers

SGaist

Here

DaJose

Okay, I'm currently downloading it.

btw:
Works the OpenGL/Cube-Example on your side?
If the answer is yes: which system you are using? Windows or Linux? Which compiler?

DaJose

Okay, all fine. I made it work with VC2017 with Qt 5.14.2.

I am happy now :)