Implement borderless windowed mode

[SNMetamorph]

[a1batross]

What's the appeal of borderless mode?

I never understood this in other games. You either play in windowed mode (with all window decorations) or in full screen mode.

[nekonomicon]

Any tiling wm for *nix has borderless windows and it's cringe.

[a1batross]

@nekonomicon not everybody runs tiling WMs or even *nixes.

I'm trying to understand what's the point of it. When I'm gaming, I usually pick bordered window mode and very rarely full screen. Never used borderless mode.

[Velaron]

Faster alt-tabbing without introducing input lag, maybe some other uses

[a1batross]

@Velaron isn't alt-tab was fast even on Windows for years now...?

[Velaron]

No, exclusive fullscreen is still awfully slow and often doesn't even work or crash the game. Most games say they use "fullscreen", but are actually borderless.

[a1batross]

Isn't that's what SDL2 does for us?

We use it to set video mode, but when no video mode switching is done, isn't it practically just borderless window?

[AshleighTheCutie]

I will say, that I find borderless full screen to actually give a slight performance boost in specific hardware configurations; namely anything with nVidia or AMD GPUs rendering through an iGPU. I'm not sure why, but I tend to get at least 5 additional FPS, but typically even more.

And besides (famous last words incoming), would it be that hard to implement?

[Velaron]

Also exclusive fullscreen sucks when using non-native resolution, as Windows decides to resize every single window.

[a1batross]

Done.