imgui-mirror/examples/example_emscripten_opengl3/README.md

How to Build

• You need to install Emscripten from https://emscripten.org/docs/getting_started/downloads.html, and have the environment variables set, as described in https://emscripten.org/docs/getting_started/downloads.html#installation-instructions

• Depending on your configuration, in Windows you may need to run emsdk/emsdk_env.bat in your console to access the Emscripten command-line tools.

• You may also refer to our Continuous Integration setup for Emscripten setup.

• Then build using make -f Makefile.emscripten while in the example_emscripten_opengl3/ directory.

• This example is browser-only. It uses imgui_impl_emscripten for platform input and imgui_impl_opengl3 for rendering.

• The default build targets OpenGL ES 2 and WebGL 1. Build with make -f Makefile.emscripten USE_WEBGL2=1 to target OpenGL ES 3 and WebGL 2 instead.

How to Run

To run on a local machine:

• emrun web/index.html will spawn a temporary local webserver and open the example in your browser. See https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html for details.
• Otherwise, generally you will need a local webserver:
  • Quoting https://emscripten.org/docs/getting_started:
    "Unfortunately several browsers (including Chrome, Safari, and Internet Explorer) do not support file:// XHR requests, and can't load extra files needed by the HTML (like a .wasm file, or packaged file data as mentioned lower down). For these browsers you'll need to serve the files using a local webserver and then open http://localhost:8000/hello.html."
  • You may use Python 3 builtin webserver: python -m http.server -d web.
  • You may use Python 2 builtin webserver: cd web && python -m SimpleHTTPServer.