Text in Multithreading OpenGL

[bahbah30]

There is always an workaround!
My issue is to show a Text in OpenGL Widget.

But I can't do it becouse QPainter that privided renderText() have to be initilized in main thread or OpenGL must run in main thread. But I can't run OpenGL in main thread, becouse I have to show 9 videos (about 40*9 images in HD format per second) at the same time. If I will do this my main windows will freez.

Do I have other optionts?

thanks!

[wysota]

There is always an workaround!
My issue is to show a Text in OpenGL Widget.

So don't use threads, that's your workaround.

[bahbah30]

So don't use threads, that's your workaround.

than will my main tread freez! How woud you show 9 vidoes without freezing main thread?

[tbscope]

Use techniques that do not block the eventloop.
This works up to a certain point. If loading and displaying of a single frame is as fast as possible and it still isn't fast enough for the computer, you'll need to look into special techniques. Threading will not help here.

I can't imagine any need for 40 fps with 9 (full) HD frames on a single computer monitor. That is one area you can greatly improve the speed.
If it is necessary, you do not want a simple computer with a single monitor, you want a computer with multiple monitors that has a single GPU for every monitor. In your example 9 monitors and 9 GPU's. And then you can redirect the painting, decoding, etc... to each GPU