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Clipper2 WASM Development Guide

Introduction

This guide provides step-by-step instructions for setting up and building the Clipper2 WebAssembly (WASM) module.

Prerequisites

Before you begin, ensure you have the following prerequisites installed on your system:

  • Emscripten: Follow the installation steps detailed here.
    • Important: Remember to install any dependencies and source the environment variables as described in the guide.

Building Clipper2 WASM

Step 1: Prepare the Environment

Change into the C++ directory:

cd clipper2/CPP

Step 2: Create a Build Directory

Set up a build directory for out-of-source builds:

mkdir build
cd build

Step 3: Generate Build Files

Use emcmake with cmake to generate the necessary build files:

emcmake cmake ../ \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CXX_FLAGS_RELEASE="-O3" \
-DCLIPPER2_HI_PRECISION=OFF

Step 4: Build the Library

Compile the library files using emmake:

emmake make

This step will create libClipper2.a and libClipper2Z.a library files.

Step 5: Compile WebAssembly Module

Return to the root directory and run the WebAssembly compilation script:

cd ..
sh clipper2-wasm/compile-wasm.sh prod

Completion

After completing these steps, you will find the WASM builds in the clipper2-wasm/dist directory.

Generating typescript files

Append --embind-emit-tsd ../clipper2z.d.ts to the ES6 export, manually add the Factory export and the glue-stub functions.