HxDatachannel

WebRTC DataChannel bindings for Hashlink and JS (Browser)
It makes use of libdatachannel to provide WebRTC DataChannels for Hashlink.

Build

Set the env/CMake vars HASHLINK_INCLUDE_DIR and HASHLINK_LIBRARY_DIR to Hashlink src and libhl directories respectively.
Then build the native extension using CMake. See the ./circleci/config.yml for a working build configuration for Windows and Mac.\a A precompiled Windows hdll is provided in Releases

Installation

After compilation, copy the built datachannel.hdll to the same folder as Hashlink binary or your game's .hl file. Then install the Haxe library by doing either of the three:

• haxelib dev datachannel <path/to/this/repo>
• haxelib git datachannel https://github.com/RandomityGuy/hxDatachannel
• haxelib install datachannel

Usage

The API closely mimics the WebRTC Browser API at MDN WebRTC API Docs. TURN servers are specified in the syntax provided at libdatachannel. More documentation is available in the form of commented code.

import datachannel.*;

class Main {
    static function main() {
        // Initialize the RTC extension
        RTC.init();

        var iceServers = ["stun:stun.l.google.com:19302", "turn:username:[email protected]"];

        // Create the RTCPeerConnection
        var rtc = new RTCPeerConnection(iceServers, "0.0.0.0");

        // Create a datachannel
        var dc = rtc.createDatachannel("name");

        // Set the remote description
        rtc.setRemoteDescription("description", "answer");

        // Hashlink needs this, you don't need a loop for JS
        while (true)
        {
            // Your application loop logic here
            // <code>
            // Process RTC events
            RTC.processEvents();
        }

        // Finalize the RTC extension
        RTC.finalize();
    }
}

Showcase

Marble Blast Haxe Port: hxDatachannel is used to implement cross platform peer-to-peer multiplayer that even works across web platforms.