[0.15.11] macOS game is low-resolution on retina displays

[danielbrauer]

The macOS version of Factorio does not support retina displays properly. Instead of using all the available resolution, the application opens in low resolution. In the screen shot below, note how the Finder window in the foreground is full-resolution, whereas Factorio is using pixel-doubling in its content and title bar:



Factorio supports high resolutions really well on Windows and Linux! My guess is it will be relatively easy to extend support to macOS. These are probably all you need:
https://developer.apple.com/reference/a ... nglsurface
https://developer.apple.com/reference/a ... calefactor

If you want to be fancy and handle dragging between retina and old displays dynamically, you should use this callback:
https://developer.apple.com/reference/a ... properties

[Baughn]

This is an old problem, with an old workaround: viewtopic.php?f=49&t=20751

Factorio runs great on Retina if you just add that key. The problem is, it tends to overload my laptop and start lagging... that's not Factorio's fault, though.

[danielbrauer]

Oh cool, that's not bad at all! I didn't try that approach because in the original post it says the property doesn't actually increase the resolution of the game:

After this the window's chrome is in retina resolution after a game restart. Unfortunately the game's graphics aren't.

Luckily this is incorrect, and everything seems to work fine in both windowed and fullscreen modes. Thank you!

[danielbrauer]

Hey hold on! The existence of a workaround does not mean this bug is resolved. Users should not have to edit a hidden file in order to get the program to support hardware which has been around since 2012.

[Baughn]

Well, yeah. This bug should still be open. If I were to make a suggestion, the devs should:

- Add that key to the application manifest, so we don't need to.
- Rescale the UI to fit the display's actual DPI, without users needing to drag the handle. Scaling already works fine, you just need to do it automatically...