Try using OpenTK's GameWindow

[peppy]

Avoid our custom form stack.

Things to note:

• We need to make sure we can still make angle work.
• We need to make sure we can get exclusive full-screen (GLControl likely needs to be derived from Form).
• Switch to OpenTK based input handlers and remove the form counterparts (these are already implemented but not used).
• Figure a way to handle input for things like TextBoxes.
• Figure out what we can do about IME.

[ddevault]

Figure out what we can do about IME.

We can just implement it ourselves, which is what we'd probably need to do for the Linux port anyway. I have a friend who implemented his own IME in a tty based on Anthy. A couple of DLLMaps and we can pass in keystrokes and get back UTF-8 suggestions.

[Tom94]

Exclusive fullscreen is not just a windows thing. The important part is that osu! doesn't need to go through a compositor, but rather goes directly to the video buffer.

[peppy]

I think it's definitely fine to ignore angle support when testing things like GameWindow (and making everything else work first), after which we can figure out how to tackle the angle issue.

Exclusive fullscreen and text input is important though.

So going down your list:

1. yes, just keep in mind that it is imperative to have in the end.
2. no (see @Tom94's answer)
3. they are already being used in LinuxGameHost.
4. look at the textbox code, specifically CreateTextInput()
5. it's of utmost importance. adding "for now" is not really a thing; if you don't consider these things from the start and figure out after you've done everything that it's not feasible, that's a lot of wasted time, right?
6. no one said anything about switching to monogame? we need to examine all possible paths and choose the best.

[peppy]

WIP @ #136