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History

ocornut 6a161b8789 Examples: Reworked setup of clear color to be compatible with transparent values. (#2693 , #2764 , #2766 , #2873 , #3447 , #3813 , #3816 )		4 years ago
..
Makefile	Examples: Emscripten: Amend ba636c5. (#3705 )	4 years ago
README.md	Examples: Emscripten: Amend ba636c5. (#3705 )	4 years ago
main.cpp	Examples: Reworked setup of clear color to be compatible with transparent values. (#2693 , #2764 , #2766 , #2873 , #3447 , #3813 , #3816 )	4 years ago
shell_minimal.html	Rename example_emscripten/ to example_emscripten_opengl3/ (#3632 )	4 years ago

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
You may also refer to our Continuous Integration setup for Emscripten setup.
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.
Then build using make while in the example_emscripten_opengl3/ directory.

To run on a local machine:

make serve will use Python3 to spawn a local webserver, you can then browse http://localhost:8000 to access your build.
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."
- Emscripten SDK has a handy emrun command: emrun web/example_emscripten_opengl3.html --browser firefox which will spawn a temporary local webserver (in Firefox). See https://emscripten.org/docs/compiling/Running-html-files-with-emrun.html for details.
- You may use Python 3 builtin webserver: python -m http.server -d web (this is what make serve uses).
- You may use Python 2 builtin webserver: cd web && python -m SimpleHTTPServer.

Emscripten 2.0 (August 2020) obsoleted the fastcomp backend, only llvm is supported.
Emscripten 1.39.0 (October 2019) obsoleted the BINARYEN_TRAP_MODE=clamp compilation flag which was required with version older than 1.39.0 to avoid rendering artefacts. See #2877 for details. If you use an older version, uncomment this line in the Makefile: #EMS += -s BINARYEN_TRAP_MODE=clamp