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glslang/HOWTO-build-wasm.md
Ryan Harrison c96e42dca8 Add WASM build target for Web version of glslang 
This adds build rules to support generating a WASM binary to be used
on the web. The API exposed to web applications is definated in the
new glslang.js.cpp file.
2019-08-08 15:08:10 -04:00

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Build as usual (see README.md), but:

  • Need emsdk in your PATH
    • Instructions located here
  • Do not checkout SPIRV-Tools into External/
    • Does not work correctly with emscripten out of the box and we don't want it in the build anyway.
    • TBD Add flag to disable SPIRV-Tool inclusion even if directory is present.
  • Wrap call to cmake using emconfigure:
    • e.g. emconfigure cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GLSLANG_WEB=ON -DENABLE_HLSL=OFF -DCMAKE_INSTALL_PREFIX="$(pwd)/install" ..
    • To get a 'true' size, make sure to use brotli to compress the .js and .wasm files