SDL backend does not work with SDL_VIDEODRIVER=wayland

[NeroBurner]

Version/Branch of Dear ImGui:

Version: 1.73 WIP
Branch: example_add_glad_files (master + glad OpenGL 3.3 Core)

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp (as well as opengl2, and vulkan)
OpenGL backends tested with gl3w and glad loaders
Compiler: g++ (GCC) 9.1.0 as well as clang version 8.0.1
Operating System: Arch Linux

My Issue:
when starting an example_sdl_XXX with the SDL_VIDEODRIVER=wayland environment variable on wayland the window loads fine, but the elements can't be interacted with

Screenshots/Video

first run with ./example_sdl_vulkan shows the xwayland symbol in the title-bar (top left corner). And it it fully functionable

second run with SDL_VIDEODRIVER=wayland ./example_sdl_vulkan shows wayland symbol, but is not actionable

Standalone, minimal, complete and verifiable example:

• On wayland compile example_sdl_(opengl3, opengl2 or vulkan)
• let example run with SDL_VIDEODRIVER=wayland environment variable SDL_VIDEODRIVER=wayland ./example_sdl_opengl3
• see that the UI cannot be interacted with

[ocornut]

Hello,
Thanks for the headup,
Could you look into it to try to understand the issue? I am probably never going to look into it myself.

[NeroBurner]

found the issue: SDL_GetGlobalMouseState does not work with the wayland backend. Most probably a security measure for programs to not grab everything the user does
https://wiki.libsdl.org/SDL_GetGlobalMouseState

using SDL_GetMouseState https://wiki.libsdl.org/SDL_GetMouseState works

I'll send a PR

[ocornut]

Thanks! Will also aim to rework some of that logic (perhaps for #2696) so may change later.
You may just add an additional defined(xxx) test in that block in the meanwhile!

[ocornut]

Merged #2802, thank you @NeroBurner !