Clarify buttons

.gitignore

@@ -11,3 +11,5 @@ sources/zstd
 sources/webshims
 sources/minetest
 sources/irrlichtmt
+sources/minetest_game
+emsdk/

Dockerfile

@@ -15,20 +15,9 @@ RUN \
 
 COPY . /minetest-wasm
 
-# Install emsdk
-RUN \
-	   cd "$HOME" \
-	&& echo "Building from $(pwd)" \
-	&& git clone --depth 1 https://github.com/emscripten-core/emsdk.git \
-	&& cd emsdk \
-	&& ./emsdk install latest \
-	&& ./emsdk activate latest
-
 # Build minetest-wasm
 RUN \
-	   cd "$HOME"/emsdk \
-	&& . ./emsdk_env.sh \
-	&& cd /minetest-wasm \
-	&& ./apply_patches.sh \
+	   cd /minetest-wasm \
 	&& ls -la \
+        && ./install_emsdk.sh \
 	&& ./build_all.sh

README.md

@@ -10,14 +10,6 @@ This has only been tested on Ubuntu 20.04.
 
 * Ubuntu: apt-get install -y build-essential cmake tclsh
 
-Pre-requisites
---------------
-The Emscripten SDK (emsdk) must be installed, activated, and in the PATH.
-It is assumed to be installed in $HOME/emsdk (edit `common.sh` to change this).
-The emsdk directory must be patched exactly once by running:
-
-    ./apply_patches.sh
-
 Building
 ---------
 
@@ -31,3 +23,29 @@ If the build completes successfully, the www/ directory will contain the entire
 includes an `.htaccess` file which sets headers that are required (by browsers) to load the app. 
 If your webserver does not recognize `.htaccess` files, you may need to set the headers in
 another way.
+
+Network Play
+------------
+
+By default, the proxy server is set to `wss://minetest.dustlabs.io/proxy` (see static/launcher.js).
+This is necessary for network play, since websites cannot open normal TCP/UDP sockets. This proxy
+is located in California. There are regional proxies which may perform better depending on your
+location:
+
+North America (Dallas) - wss://na1.dustlabs.io/mtproxy
+South America (Sao Paulo) - wss://sa1.dustlabs.io/mtproxy
+Europe (Frankfurt) - wss://eu1.dustlabs.io/mtproxy
+Asia (Singapore) - wss://ap1.dustlabs.io/mtproxy
+Australia (Melbourne) - wss://ap2.dustlabs.io/mtproxy
+
+You could also roll your own own custom proxy server. The client code is here:
+
+https://github.com/paradust7/webshims/blob/main/src/emsocket/proxy.js
+
+Custom Emscripten
+-----------------
+The Emscripten SDK (emsdk) will be downloaded and installed the first time you build. To provide
+your own instead, set $EMSDK before building (e.g. using `emsdk_env.sh`). An external Emscripten
+may need to be patched by running this exactly once:
+
+    ./apply_patches.sh /path/to/emsdk

apply_patches.sh

@@ -1,7 +1,13 @@
 #!/bin/bash -eu
 
-source common.sh
+BASE_DIR="$(dirname -- "$(readlink -f -- "$0")")"
 
+if [ $# -ne 1 ]; then
+    echo "Usage: $0 /path/to/emsdk"
+    exit 1
+fi
+
+EMSDK_ROOT="$1"
 cd "$EMSDK_ROOT"
 
 patch -p1 < "$BASE_DIR/emsdk_emcc.patch"

build_all.sh

@@ -26,8 +26,10 @@ emcc --clear-cache --clear-ports
 ./build_curl.sh      # uses webshims, openssl, zlib
 
 # Minetest
-./build_fsroot.sh
 ./build_minetest.sh
 
+# Virtual file system
+./build_fsroot.sh
+
 # Finished product
 ./build_www.sh

build_fsroot.sh

@@ -8,43 +8,43 @@
 
 source common.sh
 
-# TODO: Use `make package` for this instead.
-MTDIR="minetest-5.5.1-win64"
-unpack_source $MTDIR
-
 pushd "$BUILD_DIR"
 
 rm -rf fsroot
 mkdir fsroot
+cp -a "minetest-install" fsroot/minetest
 
-# Copy root certificates for OpenSSL
-mkdir -p fsroot/etc/ssl/certs
-# ca-certificates.crt may be a symlink
-cat /etc/ssl/certs/ca-certificates.crt > fsroot/etc/ssl/certs/ca-certificates.crt
-
-mv $MTDIR fsroot/minetest
 
+#############################################
 pushd fsroot/minetest
 
-# Don't need the Windows exe/dlls
-rm -rf bin
-
+rm -rf bin unix
 # Emscripten strips empty directories. But bin/ needs to be present so that
 # realpath() works on relative paths starting with bin/../
 mkdir bin
 echo "This is here to ensure bin exists" > bin/readme.txt
 
-# Replace these directories with the ones from the source directory
-for I in client builtin clientmods games/devtest textures; do
-  rm -rf "$I"
-  cp -r "$MINETEST_REPO/$I" "$I"
-done
-
 # Copy the irrlicht shaders
 cp -r "$IRRLICHT_REPO/media/Shaders" client/shaders/Irrlicht
 
+rm -rf games/minetest_game
+mkdir -p games
+cp -a "$SOURCES_DIR"/minetest_game games
+cd games/minetest_game
+rm -rf ".git" ".github"
+
 popd
 
+
+#############################################
+# Copy root certificates for OpenSSL
+pushd fsroot
+mkdir -p etc/ssl/certs
+# May be a symlink, use cat to copy contents
+cat /etc/ssl/certs/ca-certificates.crt > etc/ssl/certs/ca-certificates.crt
+popd
+
+
 # Make fsroot.tar
 rm -f fsroot.tar
 pushd fsroot

build_minetest.sh

@@ -57,8 +57,10 @@ if ! $INCREMENTAL; then
       -DEGL_INCLUDE_DIR="$DUMMY_INCLUDE_DIR" \
       -DCURL_LIBRARY="$INSTALL_DIR/lib/libcurl.a" \
       -DCURL_INCLUDE_DIR="$INSTALL_DIR/include" \
+      -DCMAKE_INSTALL_PREFIX="$BUILD_DIR/minetest-install" \
       -G "Unix Makefiles" \
       "$SOURCES_DIR/minetest"
 fi
 
-emmake make
+rm -rf "$BUILD_DIR/minetest-install"
+emmake make install

build_sqlite3.sh

@@ -6,7 +6,7 @@ unpack_source SQLite
 
 pushd "$BUILD_DIR/SQLite"
 export BUILD_CC="gcc"
-emconfigure ./configure --disable-shared --prefix="$INSTALL_DIR" cross_compiling=yes
+emconfigure ./configure --disable-tcl --disable-shared --prefix="$INSTALL_DIR" cross_compiling=yes
 emmake make
 emmake make install
 

common.sh

@@ -4,6 +4,28 @@ cd "$BASE_DIR"
 # Debug / Release
 export BUILD_KIND="${BUILD_KIND:-release}"
 
+# Setup emscripten (if not already)
+export EMSDK="${EMSDK:-use_local_install}"
+if [ "$EMSDK" == "use_local_install" ]; then
+    if [ ! -d emsdk ]; then
+        set +x
+        echo "-------------------------------------------------------"
+        echo "Emscripten is not installed. (EMSDK not set)"
+        echo "Press ENTER to install it into emsdk/. Ctrl-C to abort."
+        echo "-------------------------------------------------------"
+        read unused_var
+        if [ "$unused_var" != "" ]; then
+            echo "Aborting"
+            exit 1
+        fi
+        set -x
+        ./install_emsdk.sh
+    fi
+    pushd emsdk
+    source ./emsdk_env.sh
+    popd
+fi
+
 case $BUILD_KIND in
   debug)
     export MINETEST_BUILD_TYPE="Debug"
@@ -40,7 +62,7 @@ export CFLAGS="$COMMON_CFLAGS -pthread -sUSE_PTHREADS=1 -fexceptions"
 export CXXFLAGS="$COMMON_CFLAGS -pthread -sUSE_PTHREADS=1 -fexceptions"
 export LDFLAGS="$COMMON_LDFLAGS -pthread -sUSE_PTHREADS=1 -fexceptions -sEXIT_RUNTIME"
 
-export EMSDK_ROOT="$HOME/emsdk"
+export EMSDK_ROOT="$EMSDK"
 export EMSDK_SYSLIB="${EMSDK_ROOT}/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten"
 export EMSDK_SYSINCLUDE="${EMSDK_ROOT}/upstream/emscripten/cache/sysroot/include"
 

emsdk_emcc.patch

@@ -1,12 +1,12 @@
-diff -urN emsdk-pure/upstream/emscripten/emcc.py emsdk/upstream/emscripten/emcc.py
---- emsdk-pure/upstream/emscripten/emcc.py	2022-08-02 14:52:59.442877733 +0000
-+++ emsdk/upstream/emscripten/emcc.py	2022-08-02 14:52:18.131057940 +0000
-@@ -624,6 +624,8 @@
-   cmd = config.JS_ENGINE
+diff -urN emsdk/upstream/emscripten/emcc.py emsdk-fixed/upstream/emscripten/emcc.py
+--- emsdk/upstream/emscripten/emcc.py	2022-11-07 20:04:28.000000000 +0000
++++ emsdk-fixed/upstream/emscripten/emcc.py	2022-11-11 02:48:00.766940527 +0000
+@@ -632,6 +632,8 @@
+   cmd = config.JS_ENGINES[0]
    if settings.WASM_BIGINT:
-     cmd.append('--experimental-wasm-bigint')
+     cmd += shared.node_bigint_flags()
 +  if settings.USE_PTHREADS:
 +    cmd.append('--experimental-wasm-threads')
    cmd = shared.shlex_join(cmd)
-   if not os.path.isabs(config.JS_ENGINE[0]):
+   if not os.path.isabs(cmd[0]):
      # TODO: use whereis etc. And how about non-*NIX?

fetch_sources.sh

@@ -16,7 +16,6 @@ getsource "https://downloads.xiph.org/releases/vorbis/libvorbis-1.3.7.tar.gz" 0e
 getsource "https://www.sqlite.org/src/tarball/698edb77/SQLite-698edb77.tar.gz" b1568dc5d17788b9dd9575ecd224b3f7985b51764bc2f34f4808d851332840ef
 getsource "https://www.openssl.org/source/openssl-1.1.1n.tar.gz" 40dceb51a4f6a5275bde0e6bf20ef4b91bfc32ed57c0552e2e8e15463372b17a
 getsource "https://curl.se/download/curl-7.82.0.tar.bz2" 46d9a0400a33408fd992770b04a44a7434b3036f2e8089ac28b57573d59d371f
-getsource "https://github.com/minetest/minetest/releases/download/5.5.1/minetest-5.5.1-win64.zip" 9be48fb4126312b0d8fd048d1ab06d59b3109f6fe037fcd5ab65b99507e68a5f
 getsource "https://www.libarchive.org/downloads/libarchive-3.6.1.tar.xz" 5a411aceb978f43e626f0c2d1812ddd8807b645ed892453acabd532376c148e6
 
 # These are never checked into the repo, since they are separate git repos.
@@ -27,13 +26,17 @@ getrepo libpng "https://git.code.sf.net/p/libpng/code" a37d4836519517bdce6cb9d95
 getrepo freetype "https://gitlab.freedesktop.org/freetype/freetype.git" a8e4563c3418ed74d39019a6c5e2122d12c8f56f
 getrepo zstd "https://github.com/facebook/zstd.git" e47e674cd09583ff0503f0f6defd6d23d8b718d3
 
+# Minetest Game
+getrepo minetest_game "https://github.com/minetest/minetest_game.git" 99a719309559b632af65756f380496aa269d4b4a
+
 # These repos are part of the fork
 getrepo webshims "https://github.com/paradust7/webshims.git" 91c3fe85d2cb7f85cc8e19d3f53dc8f252a69ff7
-getrepo minetest "https://github.com/paradust7/minetest.git" 08c43ff4602810269a204bcae1cdd72005b82f22
-getrepo irrlichtmt "https://github.com/paradust7/irrlicht.git" d1dae521fb75d2140e3db20a4562f907cdb77971
+getrepo minetest "https://github.com/paradust7/minetest.git" 20368d3a8d797f06c1a33aeb660f9ca4f5798595
+getrepo irrlichtmt "https://github.com/paradust7/irrlicht.git" 5a79e1ae2bb0346e261152a21261af0531c2e4bf
 
 # Make irrlichtmt symlink
 pushd "$SOURCES_DIR"/minetest/lib
-rm -f irrlichtmt
-ln -s ../../irrlichtmt irrlichtmt
+if [ ! -e irrlichtmt ]; then
+  ln -s ../../irrlichtmt irrlichtmt
+fi
 popd

install_emsdk.sh

@@ -0,0 +1,16 @@
+#!/bin/bash -eux
+
+BASE_DIR="$(dirname -- "$(readlink -f -- "$0")")"
+
+cd "$BASE_DIR"
+
+rm -rf emsdk
+git clone https://github.com/emscripten-core/emsdk.git
+
+pushd emsdk
+./emsdk install 3.1.25
+./emsdk activate 3.1.25
+popd
+
+./apply_patches.sh emsdk
+

static/index.html

@@ -5,17 +5,60 @@
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     <title>Minetest for the Web</title>
   </head>
-  <body>
-    <div id="temporary_console" class="console"></div>
+  <body style="background-color: black">
+    <div id="temporary_console" class="console" style="color: white"></div>
+    <div id="launch_form" class="console" style="color: white; display: none;">
+      <hr>
+      <b>Select Network Proxy:</b>
+      <select id="select_proxy">
+          <!-- filled by javascript -->
+      </select>
+
+      <hr>
+      <button id="launch" style="width: 300px; height: 50px; font-size: 20pt;">Launch Minetest</button>
+      <br/>
+      <hr>
+      <b style="font-size: 20pt;">Run Server In Browser</b>
+      <br/>
+      <b>Player Name:</b>
+      <input style="border: 2px solid black; width: 400px; height: 2em" type="text" id="multiplayer_username" required="" pattern="[A-Za-z0-9_-]{1,20}" maxlength="19" title="Alphanumeric, 19 characters max">
+      <br/>
+      <b>Game:</b>
+      <select id="multiplayer_game">
+          <option value="minetest_game">minetest_game</option>
+      </select>
+      <br/>
+      <span>After launch, copy the URL and use it to open clients.</span>
+      <br/>
+      <span>Closing this page shuts down the server and ends the game.</span>
+      <br/>
+      <button id="launch_server" style="width: 300px; height: 50px; font-size: 20pt;">Launch Server</button>
+
+    </div>
+    <div id="join_form" class="console" style="color: white; display: none;">
+      <b>Joining game:</b>
+      <br/>
+      <b>Player Name:</b>
+      <input style="border: 2px solid black; width: 400px; height: 2em" type="text" id="join_username" required="" pattern="[A-Za-z0-9_-]{1,20}" maxlength="19" title="Alphanumeric, 19 characters max">
+      <br/>
+      <button id="join_launch">Join Game</button>
+    </div>
     <script type="text/javascript" src="%__RELEASE_UUID__%/launcher.js"></script>
     <script type="text/javascript">
-      document.body.style.backgroundColor = 'black';
+      // Reduce memory and network usage
+      const memorySavingConfig = `
+viewing_range = 85
+max_block_send_distance = 5
+max_block_generate_distance = 5
+`;
+
+      const launchForm = document.getElementById('launch_form');
+      const joinForm = document.getElementById('join_form');
       const tcon = document.getElementById('temporary_console');
-      tcon.style.color = 'white';
       function tcon_print(prefix, line) {
           if (prefix) {
               for (child of tcon.childNodes) {
-                  if (child.innerText.startsWith(prefix)) {
+                  if (child.nodeName == 'PRE' && child.innerText.startsWith(prefix)) {
                       child.innerText = prefix + line;
                       return;
                   }
@@ -25,6 +68,142 @@
           p.innerText = prefix + line;
           tcon.appendChild(p);
       }
+
+      function wipePage() {
+          launchForm.remove();
+          joinForm.remove();
+          tcon.remove();
+      }
+
+      function enableLaunchForm() {
+          if (join_code) {
+              joinForm.style.display = 'block';
+          } else {
+              launchForm.style.display = 'block';
+          }
+
+          const select_proxy = document.getElementById('select_proxy');
+          const proxies = [
+              [ "wss://na1.dustlabs.io/mtproxy", "North America" ],
+              [ "wss://sa1.dustlabs.io/mtproxy", "South America" ],
+              [ "wss://eu1.dustlabs.io/mtproxy", "Europe" ],
+              [ "wss://ap1.dustlabs.io/mtproxy", "Asia" ],
+              [ "wss://ap2.dustlabs.io/mtproxy", "Australia" ],
+          ];
+          proxies.forEach((entry, index) => {
+              const opt = document.createElement('option');
+              opt.value = index;
+              opt.innerText = entry[1];
+              select_proxy.appendChild(opt);
+          });
+
+          const launch = document.getElementById('launch');
+          launch.addEventListener('click', () => {
+              const proxyIndex = document.getElementById('select_proxy').value;
+              const proxy = proxies[proxyIndex][0];
+              wipePage();
+              mtl.setProxy(proxy);
+              mtl.launch(args);
+          });
+
+          const launchServer = document.getElementById('launch_server');
+          launchServer.addEventListener('click', async () => {
+              const proxyIndex = document.getElementById('select_proxy').value;
+              const username = document.getElementById('multiplayer_username').value;
+              const game = document.getElementById('multiplayer_game').value;
+              if (username.length == 0) {
+                  alert("Empty username");
+                  return;
+              }
+              wipePage();
+
+              const proxy = proxies[proxyIndex][0];
+              mtl.setProxy(proxy);
+              mtl.addPack(game);
+              const [cmd, serverCode, clientCode] = await queryProxy(`MAKEVPN ${game}`, proxy);
+              if (cmd != 'NEWVPN') {
+                  alert("Invalid response from proxy");
+                  return;
+              }
+              const args = new MinetestArgs();
+              args.extra.push('--withserver');
+              args.gameid = game;
+              args.name = username;
+              args.address = '127.0.0.1';
+              args.port = 30000;
+              args.go = true;
+              history.pushState({}, "", `?proxy=${proxyIndex}&game=${game}&join=${clientCode}`);
+              mtl.setVPN(serverCode, clientCode);
+              mtl.setMinetestConf(memorySavingConfig);
+              mtl.launch(args);
+          });
+
+          const joinLaunch = document.getElementById('join_launch');
+          joinLaunch.addEventListener('click', async () => {
+              const username = document.getElementById('join_username').value;
+              if (username.length == 0) {
+                  alert("Empty username");
+                  return;
+              }
+              wipePage();
+              mtl.setProxy(proxies[join_proxy][0]);
+              mtl.addPack(join_game);
+
+              const args = new MinetestArgs();
+              args.gameid = join_game;
+              args.name = username;
+              args.address = '172.16.0.1';
+              args.port = 30000;
+              args.go = true;
+              mtl.setVPN(null, join_code);
+              mtl.setMinetestConf(memorySavingConfig);
+              mtl.launch(args);
+          });
+      }
+
+      function queryProxy(cmd, proxy) {
+          return new Promise((resolve, reject) => {
+              let finished = false;
+              const ws = new WebSocket(proxy);
+              ws.addEventListener('open', (event) => {
+                  ws.send(cmd);
+              });
+              ws.addEventListener('error', (event) => {
+                  alert('Error initiating proxy connection');
+                  finished = true;
+                  reject(new Error('Received error'));
+              });
+              ws.addEventListener('close', (event) => {
+                  if (!finished) {
+                      alert('Proxy connection closed unexpectedly');
+                      finished = true;
+                      reject(new Error('Received close'));
+                  }
+              });
+              ws.addEventListener('message', (event) => {
+                  if (typeof event.data !== 'string') {
+                      alert('Invalid message received from proxy');
+                      finished = true;
+                      reject(new Error('Invalid message'));
+                      return;
+                  }
+                  finished = true;
+                  ws.close();
+                  resolve(event.data.split(' '));
+              });
+          });
+      }
+
+      let join_code = null;
+      let join_proxy = null;
+      let join_game = null;
+      const peek_params = new URLSearchParams(window.location.search);
+      if (peek_params.has("join")) {
+          join_code = peek_params.get("join");
+          join_game = peek_params.get("game");
+          join_proxy = peek_params.get("proxy");
+      }
+
       const args = MinetestArgs.fromQueryString(window.location.search);
       tcon_print("", "Minetest Arguments: " + JSON.stringify(args.toArray(), null, '    '));
       tcon_print("", "Data Packs: " + JSON.stringify(args.packs, null, '    '));
@@ -41,16 +220,7 @@
       };
       mtl.onready = () => {
           tcon_print("", "READY!");
-          const launchButton = document.createElement('button');
-          launchButton.style.width = '300px';
-          launchButton.style.height = '120px';
-          launchButton.style.fontSize = '20pt';
-          launchButton.innerText = 'Click to Launch';
-          launchButton.addEventListener('click', () => {
-              tcon.remove();
-              mtl.launch(args);
-          });
-          tcon.appendChild(launchButton);
+          enableLaunchForm();
       };
       mtl.onerror = (err) => {
           tcon_print("", "**************** FATAL ERROR ******************");

static/launcher.js

@@ -240,6 +240,7 @@ var emloop_unpause;
 var emloop_init_sound;
 var emloop_invoke_main;
 var emloop_install_pack;
+var emloop_set_minetest_conf;
 var irrlicht_want_pointerlock;
 var irrlicht_force_pointerlock;
 var irrlicht_resize;
@@ -254,6 +255,7 @@ function emloop_ready() {
     emloop_init_sound = cwrap("emloop_init_sound", null, []);
     emloop_invoke_main = cwrap("emloop_invoke_main", null, ["number", "number"]);
     emloop_install_pack = cwrap("emloop_install_pack", null, ["number", "number", "number"]);
+    emloop_set_minetest_conf = cwrap("emloop_set_minetest_conf", null, ["number"]);
     irrlicht_want_pointerlock = cwrap("irrlicht_want_pointerlock", "number");
     irrlicht_force_pointerlock = cwrap("irrlicht_force_pointerlock", null);
     irrlicht_resize = cwrap("irrlicht_resize", null, ["number", "number"]);
@@ -274,9 +276,9 @@ function makeArgv(args) {
     const argv = _malloc((args.length + 1) * 4);
     let i;
     for (i = 0; i < args.length; i++) {
-        HEAPU32[(argv >> 2) + i] = allocateUTF8(args[i]);
+        HEAPU32[(argv >>> 2) + i] = allocateUTF8(args[i]);
     }
-    HEAPU32[(argv >> 2) + i] = 0; // argv[argc] == NULL
+    HEAPU32[(argv >>> 2) + i] = 0; // argv[argc] == NULL
     return [i, argv];
 }
 
@@ -500,7 +502,7 @@ class MinetestArgs {
         if (this.password) args.push('--password', this.password);
         if (this.gameid) args.push('--gameid', this.gameid);
         if (this.address) args.push('--address', this.address);
-        if (this.port) args.push('--port', this.port);
+        if (this.port) args.push('--port', this.port.toString());
         args.push(...this.extra);
         return args;
     }
@@ -513,7 +515,7 @@ class MinetestArgs {
         if (this.password) params.append('password', this.password);
         if (this.gameid) params.append('gameid', this.gameid);
         if (this.address) params.append('address', this.address);
-        if (this.port) params.append('port', this.port);
+        if (this.port) params.append('port', this.port.toString());
         const extra_packs = [];
         this.packs.forEach(v => {
             if (v != 'base' && v != 'minetest_game' && v != 'devtest' && v != this.gameid) {
@@ -538,7 +540,7 @@ class MinetestArgs {
         if (params.has('password')) r.password = params.get('password');
         if (params.has('gameid')) r.gameid = params.get('gameid');
         if (params.has('address')) r.address = params.get('address');
-        if (params.has('port')) r.port = params.get('port');
+        if (params.has('port')) r.port = parseInt(params.get('port'));
         if (r.gameid && r.gameid != 'minetest_game' && r.gameid != 'devtest' && r.gameid != 'base') {
             r.packs.push(r.gameid);
         }
@@ -574,6 +576,7 @@ class MinetestLauncher {
         this.proxyUrl = "wss://minetest.dustlabs.io/proxy";
         this.packsDir = DEFAULT_PACKS_DIR;
         this.packsDirIsCors = false;
+        this.minetestConf = null;
 
         mtScheduler.addCondition("wasmReady", loadWasm);
         mtScheduler.addCondition("launch_called");
@@ -611,6 +614,10 @@ class MinetestLauncher {
         this.vpn = serverCode ? serverCode : clientCode;
     }
 
+    setMinetestConf(contents) {
+        this.minetestConf = contents;
+    }
+
     // Returns pack status:
     //   0 - pack has not been added
     //   1 - pack is downloading
@@ -725,6 +732,11 @@ class MinetestLauncher {
         this.addPacks(this.args.packs);
         activateBody();
         fixGeometry();
+        if (this.minetestConf) {
+            const confBuf = allocateUTF8(this.minetestConf)
+            emloop_set_minetest_conf(confBuf);
+            _free(confBuf);
+        }
         emloop_init_sound();
         // Setup emsocket
         // TODO: emsocket should export the helpers for this