okmatija / jai-imgui

jai-imgui

NOTE: Jai comes with a working ImGui module, but based on an older version of ImGui.

This is an alternate Dear ImGui wrapper for Jai with an automatic C++ <-> Jai bindings generator.

Currently this repo includes Windows binaries for the docking branch of ImGui 1.83 WIP. (You can checkout whatever revision you like in the imgui subrepo and regenerate the bindings.)

This project makes an effort to preserve the convenience of the C++ API by:

• maintaining default argument values
• turning label and label_end const char * arguments into single Jai string arguments
• providing a module parameter for whether to link statically against ImGui or not

Building demos

jai build_examples.jai

Then run

example_no_graphics.exe to see a command-line (non-graphical) test of the bindings, or

example_opengl.exe to see the ImGui demo window. In this second example, you can go to Examples->Dockspace to test out docking.

One gotcha here: there's an ImGui module included in Jai. The demos expect THIS ImGui library to be #imported. So your build script in your own project must modify the import_path.

Regenerating bindings from scratch

It's important to generate bindings with the same #define config values as the binaries you're using were built with. To simplify this process, all the config this project uses is in jai-imgui.cpp. The values currently are

#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
#define IMGUI_DISABLE_DEFAULT_ALLOCATORS
#define IMGUI_USE_BGRA_PACKED_COLOR

but you can modify them however you like.

The ImGui project itself sits in a subrepository in the imgui directory.

To update the ImGui headers, and rebuild win/static/imgui.lib and win/dll/imgui.dll:

update_imgui_subrepro_and_rebuild_libs.bat

Then, to regenerate imgui.jai:

jai generate_imgui_bindings.jai