Need add support of retina displays

[ioannismihailidis]

same problem in QQuickRenderControl example with qt 5.4 under mac os x 10.10.2. Which Os are you using?

[RSATom]

I am on OS X 10.10.2 too. I've checked demo - it works fine for me. What hardware do you have?

[ioannismihailidis]

MBP Retina 2012, Nvidia Geforce 650M, Qt5.4 downloaded with online MaintenanceTool. Any idea what might be the issue?

[RSATom]

I didn't try it on retina display, and I have only integrated video (Intel hd 4000). Maybe it's related. Do you see anything in debug output?

[ioannismihailidis]

Intergrated has the same problem. BUT: Running the app in low (non retina) resolution fixes the problem! Thanks!

[RSATom]

It's very interesting and will be very useful to me too. So thank you! :) Could you please share solution if you will find it?

[ioannismihailidis]

I will let you know! In the meanwhile I will wait for qt5.5...maybe the problem will be solved :)

[RSATom]

I can't wait 5.5 :) So maybe will have to fix it myself. Will write here if will find solution.

[jherico]

I suggest you check https://bugreports.qt.io/browse/QTBUG-45613 and https://bugreports.qt.io/browse/QTBUG-42114 (the latter is reported fixed, but I'm having this problem, so I cloned it as the former).

I added a significant amount of detail to QTBUG-45613 after capturing the GL calls with a tracing program. The problem seems to be a bad glViewport call (at least) when on the retina display.

[RSATom]

@jherico, thank you for info. Do you use ~~QmlVlc~~ QuickLayer? I just don't have access to Mac with retina display and thus can't test any solution.

[jherico]

no, I don't, sorry. I may have to dive into the code myself, but for the time being I'm disabling the HDPI functionality on my retina display.

[RSATom]

If problem related to glViewport, then it could be fixed just by adding at https://github.com/RSATom/QuickLayer/blob/master/QuickLayer.mm#L115 something like this:

    glViewport(0, 0, fbo->width(), fbo->height());