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Implement emscripten backend + opengl3 example #9120

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Implement emscripten backend + opengl3 example #9120

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@Teselka Teselka commented Dec 15, 2025 •
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This is an implementation of the emscripten backend with opengl3 renderer as an example.

Features:

  • Clipboard (without IME).
  • Mouse (including mouse/touch/pen with IMGUI_IMPL_EMSCRIPTEN_POINTER_EVENTS, otherwise supports mouse only, touch input api worked bad for me).
  • Keyboard (including edge case with tab/backspace interaction, see here).
  • Mouse cursor and shape (implemented with document.querySelector(target_id).style.cursor = shape;)
  • Dynamic canvas resizing (with user ImGui_ImplEmscripten_UpdateCanvasSize api).
  • Gamepad.
  • Numpad (i don't have keyboard with a numpad).

#8178

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Teselka commented Dec 18, 2025

Added gamepad support for it, tried to match final analog input with the win32 backend.

@Teselka Teselka changed the title Implement imgui_impl_emscripten Implement emscripten backend + opengl3 example Dec 18, 2025
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@Teselka @ocornut