Copyright (C) 2014-2018 Juergen Wothke
A running example can be found here: http://www.wothke.ch/webxmp
This mainly "project" is based on libxmp (4.4.1): http://xmp.sourceforge.net/ (The "hvl" add-on is based on Xeron/IRIS's "hvl2wav tool" with changes performed by Vitamin/CAIG. I hope that eventually XMP's currently unused "hvl" impl will be usable so that this add-on will then no longer be neeeded.)
You'll need Emscripten (http://kripken.github.io/emscripten-site/docs/getting_started/downloads.html). The make script is designed for use of emscripten version 1.37.29 (unless you want to create WebAssembly output, older versions might also still work).
The below instructions assume that the libxmp-4.4.1 project folder has been moved into the main emscripten installation folder (maybe not necessary) and that a command prompt has been opened within the project's "emscripten" sub-folder, and that the Emscripten environment vars have been previously set (run emsdk_env.bat).
The Web version is then built using the makeEmscripten.bat that can be found in this folder. The script will compile directly into the "emscripten/htdocs" example web folder, were it will create the backend_xmp.js library. The content of the "htdocs" can be tested by first copying it into some document folder of a web server.
The current version requires version 1.02 (older versions will not support WebAssembly) of my https://github.com/wothke/webaudio-player.
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA