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Draco js module build instructions #6672

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Jun 13, 2018
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Draco js module build instructions #6672

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861978a
Add Draco JS module build instructions
ggetz May 25, 2018
4a78dc2
Update draco link
ggetz Jun 8, 2018
77af223
Suggest Linux or Linux Subsystem
ggetz Jun 12, 2018
be36169
Clarify an official release
ggetz Jun 12, 2018
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16 changes: 16 additions & 0 deletions Documentation/Contributors/DracoModuleManagement/README.md
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## Updating the Draco JavaScript Decoder Module

We use a custom build of the [Draco](https://github.com/google/draco) decoder JavaScript module to allow for IE11 compatibility.


1. Download and install a make tool.
* Preferably, use Linux or [the Linux Subsystem for Windows 10](https://docs.microsoft.com/en-us/windows/wsl/install-win10) and `make` to build.
* Optionally, [MSYS2](http://www.msys2.org/). Follow installation instructions and add the path to MSYS2's usr/bin to your `PATH`. For example, if the path is `C:\msys64\usr\bin`, run `PATH=%PATH%;C:\msys64\usr\bin`.
2. Clone or download the [Draco release](https://github.com/google/draco/releases).
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Actually, one comment. If you clone Draco from git, you'll get master and not an official release, right? We should probably always include an official release in Cesium

3. [Download and install Emscripten](https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html)
4. In a seperate directory, follow the [CMake JavaScript Encoder/Decoder Instructions](https://github.com/google/draco#javascript-encoderdecoder). When running cmake, specify `"Unix Makefiles"` as the target, and including the flag `-DIE_COMPATIBLE=true`, ie.
```terminal
cmake ..\path\to\draco -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE="absolute\path\emscripten\cmake\Modules\Platforms\Emscripten.cmake" -DIE_COMPATIBLE=true
```
5. In that directory, build with `make -j`.
6. Copy the output `draco_decoder.js` file to the `Source\ThirdParty\Workers` directory.