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Just wanted to start a thread to collect the work done by @ainvar on integrating imgui support into Orx.
This is a question that is often asked if Orx can support a minimal UI library for doing buttons, dropdowns and other controls.
These can be either used in-game, or to make applications with Orx, like editors, for example.
You can use Ainvar's repository to learn how to set up imgui in Orx: https://bitbucket.org/ainvar/imguiorx
Also, you can see many examples of control usage at: https://github.com/ocornut/imgui
The actual file that contains a handful of functions so that Orx can use imgui to render and get inputs is here: https://bitbucket.org/ainvar/imguiorx/src/dac596c944cf17fbeaa1b0837e76861f526959e8/src/ImGui_Orx.cpp?at=master&fileviewer=file-view-default
There is also a nuklear test at: https://github.com/vurtun/nuklear
Tutorials will be available soon on the wiki on how to start, and how to use simple controls to build up an application.