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gnubg_web.html
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gnubg_web.html
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<html>
<meta charset="UTF-8">
<canvas id="backgammonBoard" width="600" height="360"></canvas>
<div id="info"> </div>
<div id="instructions">To begin, click "New money session" or "New match". Click "Help" for more instructions.</div>
<div id="buttons">
<button id="roll" onclick="roll();" disabled="true">Roll</button>
<button id="double" onclick="double();" disabled="true">Double</button>
<button id="accept" onclick="accept();" disabled="true">Accept</button>
<button id="reject" onclick="reject();" disabled="true">Reject</button>
<button id="beaver" onclick="beaver();" disabled="true">Beaver</button>
<button type="resign" id="resign" disabled="true" onclick='var value = prompt("Enter value(1=single, 2=gammon, 3=backgammon)"); resign(value);'>Resign</button>
<br>
<button id="newSession" onclick="newSession();">New money session</button>
<button id="newMatch" onclick='var length = prompt("Enter match length"); newMatch(length);'>New match</button>
<button id="download" onclick='var filename = prompt("Enter file name to download"); download(filename);'>Download</button>
<button id="upload" onclick="upload();">Upload</button>
<button id="help" onclick="window.open('help.html', '_blank');">Help</button>
<br>
<form id="command_form">
<label for="command_text">Move or gnubg command:</label>
<input id="command_text" type="text"></input>
<input type="submit" value="Submit"></input>
</form>
</div>
<textarea id="gnubg_log" cols="120" rows="20" readonly="true">
Loading, please wait...
</textarea>
<script src="graphics.js"></script>
<script type="text/javascript">
function arrayToHeap(typedArray){
var numBytes = typedArray.length * typedArray.BYTES_PER_ELEMENT;
var ptr = Module._malloc(numBytes);
var heapBytes = Module.HEAPU8.subarray(ptr, ptr + numBytes);
heapBytes.set(typedArray);
return heapBytes;
}
function makeCommandBuffer() {
var rawBuffer = new ArrayBuffer(1000);
var heapView = new Uint8Array(rawBuffer);
return arrayToHeap(heapView).byteOffset;
}
function fillCommandBuffer(buffer, str) {
for (var i=0; i<str.length; i++) {
Module.setValue(buffer + i, str.charCodeAt(i), "i8");
}
Module.setValue(buffer + str.length, 0, "i8");
}
commandBufferInititalized = false;
commandBuffer = 0;
function gnubgCommand(command) {
if (!commandBufferInititalized) {
commandBuffer = makeCommandBuffer();
commandBufferInititalized = true;
}
if (command.startsWith("b/") || command.startsWith("bar/") || ["1","2","3","4","5","6","7","8","9"].includes(command.substring(0,1))) { // assume it's a move
command = "move " + command;
}
fillCommandBuffer(commandBuffer, command);
writeLog("=> " + command);
Module._run_command(commandBuffer);
window.setTimeout(doNextTurn, 0);
}
lastLogLine = ""; // needed for stdin prompts from gnubg's GetInput function in gnubg.c
function writeLog(str) {
if (str.startsWith("falling back to ArrayBuffer instantiation") || str.startsWith("wasm streaming compile failed") || str.startsWith("file packager has copied file data into memory")) { // suppress various startup messages not from gnubg, put it into console instead
console.log(str);
} else {
if (str.startsWith("board:") || str.includes("offers to resign")) {
updateBoard(str);
window.setTimeout(doNextTurn, 1000);
}
if (!str.startsWith("board:")) {
lastLogLine = str;
var gnubg_log = document.getElementById("gnubg_log");
gnubg_log.textContent += str;
gnubg_log.textContent += '\n';
gnubg_log.scrollTop = gnubg_log.scrollHeight;
}
}
}
function doNextTurn() {
Module._doNextTurn();
}
window.addEventListener("load", function () {
var form = document.getElementById("command_form");
form.addEventListener("submit", function (event) {
event.preventDefault();
var command_text_element = document.getElementById("command_text");
var command = command_text_element.value;
gnubgCommand(command);
command_text_element.value = "";
});
// draw an empty board on initial load
drawBoard(true);
});
lastTurn = 0;
lastBoard = "";
resignationOfferPending = false;
resignationValue = 0;
function updateBoard(rawBoard) {
if (resignationOfferPending) { // Ignore board update immediately after resignation offer, since nothing has changed and we don't want to remove the "Accept or reject the resignation" message
resignationOfferPending = false;
resignationValue = 0;
return;
}
var resignationOffered = false;
if (rawBoard.includes("offers to resign")) {
resignationOffered = true;
resignationOfferPending = true;
if (rawBoard.endsWith("a single game.")) {
resignationValue = 1;
} else if (rawBoard.endsWith("a gammon.")) {
resignationValue = 2;
} else if (rawBoard.endsWith("a backgammon.")) {
resignationValue = 3;
} else {
console.error("Unknown resignation value " + resignationValue);
}
rawBoard = lastBoard;
}
var rawBoardSplit = rawBoard.split(":");
var myName = rawBoardSplit[1];
var opponentName = rawBoardSplit[2];
var boardString = rawBoardSplit.slice(6, 6+26);
var board = boardString.map(function(x) { return parseInt(x); });
var matchLength = parseInt(rawBoardSplit[3]);
var myScore = parseInt(rawBoardSplit[4]);
var opponentScore = parseInt(rawBoardSplit[5]);
var turn = parseInt(rawBoardSplit[32]);
var dice1 = parseInt(rawBoardSplit[33]);
var dice2 = parseInt(rawBoardSplit[34]);
var cubeValue = parseInt(rawBoardSplit[37]);
var iMayDouble = parseInt(rawBoardSplit[38]);
var opponentMayDouble = parseInt(rawBoardSplit[39]);
var wasDoubled = parseInt(rawBoardSplit[40]);
var myPiecesOff = parseInt(rawBoardSplit[45]);
var opponentPiecesOff = parseInt(rawBoardSplit[46]);
var crawford = parseInt(rawBoardSplit[51]);
if (dice1 > 0 && turn != lastTurn) {
var name = (turn == 1) ? myName : opponentName;
writeLog(name + " rolls " + dice1 + " " + dice2);
lastTurn = turn;
}
drawBoard(false,
board,
matchLength,
myScore,
opponentScore,
turn,
dice1,
dice2,
cubeValue,
iMayDouble,
opponentMayDouble,
wasDoubled,
myPiecesOff,
opponentPiecesOff,
crawford,
resignationOffered,
resignationValue);
lastBoard = rawBoard;
}
function newSession() {
gnubgCommand("new session");
}
function newMatch(matchLength) {
gnubgCommand("new match " + matchLength);
}
function roll() {
gnubgCommand("roll");
}
function double() {
gnubgCommand("double");
}
function accept() {
gnubgCommand("accept");
}
function reject() {
gnubgCommand("reject");
}
function beaver() {
gnubgCommand("beaver");
}
function resign(val) {
gnubgCommand("resign " + val);
}
const fakeDownload = document.createElement('a');
fakeDownload.style.display = 'none';
function download(filename) {
const data = new Blob([FS.readFile(filename, {encoding: 'utf8'})]);
const url = window.URL.createObjectURL(data);
fakeDownload.href = url;
fakeDownload.download = filename;
document.body.appendChild(fakeDownload);
fakeDownload.click();
window.URL.revokeObjectURL(url);
document.body.removeChild(fakeDownload);
}
const fakeUpload = document.createElement('input');
fakeUpload.type = 'file';
fakeUpload.multiple = true;
fakeUpload.style.display = 'none';
fakeUpload.addEventListener("change", function() {
for (var i=0; i < this.files.length; i++) {
const file = this.files.item(i);
console.log('Uploading ' + file.name);
const fileReader = new FileReader();
fileReader.onload = function(e) {
const arrayBuffer = e.target.result;
const data = new Uint8Array(arrayBuffer);
FS.writeFile(file.name, data);
writeLog('Successfully uploaded ' + file.name);
}
fileReader.onerror = function() {
writeLog('Could not upload ' + file.name);
}
fileReader.readAsArrayBuffer(file);
}
document.body.removeChild(this);
}, false);
function upload() {
document.body.appendChild(fakeUpload);
fakeUpload.click();
}
inputBuffer = "";
inputBufferPointer = 0;
var Module = {
preRun: [
function () {
FS.init(
function stdin() {
if (inputBuffer == "") {
inputBuffer = window.prompt(lastLogLine);
inputBuffer += '\n';
inputBufferPointer = 1;
return inputBuffer.charCodeAt(0);
} else {
if (inputBufferPointer < inputBuffer.length) {
var code = inputBuffer.charCodeAt(inputBufferPointer);
++inputBufferPointer;
return code;
} else {
inputBuffer = "";
return null;
}
}
});
}],
print: writeLog,
printErr: writeLog,
onRuntimeInitialized: function() {
Module._start();
}}
</script>
<script src="gnubg.js"></script>
<footer>
<a href="https://github.com/hwatheod/gnubg-web">Github repo for gnubg-web.</a>
</footer>
</html>