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const assets = [
"wk.webp",
"wq.webp",
"wr.png",
"wb.webp",
"wn.png",
"wp.png",
"bk.webp",
"bq.png",
"br.webp",
"bb.webp",
"bn.webp",
"bp.png"
].map(x => "./assets/" + x);
let hoveringPiece = -1;
const bitboards = [
16n,
8n,
129n,
36n,
66n,
65280n,
1152921504606846976n,
576460752303423488n,
9295429630892703744n,
2594073385365405696n,
4755801206503243776n,
71776119061217280n,
];
const WHITE_KING = 1;
const WHITE_QUEEN = 2;
const WHITE_ROOK = 3;
const WHITE_BISHOP = 4;
const WHITE_KNIGHT = 5;
const WHITE_PAWN = 6;
const BLACK_KING = 7;
const BLACK_QUEEN = 8;
const BLACK_ROOK = 9;
const BLACK_BISHOP = 10;
const BLACK_KNIGHT = 11;
const BLACK_PAWN = 12;
function trackBitboard(j, i, selected, output) {
const mask = 1n << BigInt(i);
if (selected) {
bitboards[j] |= mask;
} else {
bitboards[j] &= ~mask;
}
output.textContent = bitboards[j].toString();
}
function checkForPiece(square, bitIndex, set = true) {
for (let i = 0; i < bitboards.length; i++) {
const mask = bitboards[i];
if ((mask >> BigInt(bitIndex)) & 1n) {
if (set) square.style.backgroundImage = `url(${assets[i]})`;
return i;
}
}
return null;
}
const selectedAction = trackBitboard;
window.onkeydown = (e) => {
if (e.key == 'b') {
console.log('Bitboards');
console.log(`
position.bitboards[WHITE_KING] = ${bitboards[0].toString()}ULL;
position.bitboards[WHITE_QUEEN] = ${bitboards[1].toString()}ULL;
position.bitboards[WHITE_ROOK] = ${bitboards[2].toString()}ULL;
position.bitboards[WHITE_BISHOP] = ${bitboards[3].toString()}ULL;
position.bitboards[WHITE_KNIGHT] = ${bitboards[4].toString()}ULL;
position.bitboards[WHITE_PAWN] = ${bitboards[5].toString()}ULL;
position.bitboards[BLACK_KING] = ${bitboards[6].toString()}ULL;
position.bitboards[BLACK_QUEEN] = ${bitboards[7].toString()}ULL;
position.bitboards[BLACK_ROOK] = ${bitboards[8].toString()}ULL;
position.bitboards[BLACK_BISHOP] = ${bitboards[9].toString()}ULL;
position.bitboards[BLACK_KNIGHT] = ${bitboards[10].toString()}ULL;
position.bitboards[BLACK_PAWN] = ${bitboards[11].toString()}ULL;
`)
}
}
window.onload = () => {
const output = document.getElementById("output");
const board = document.getElementById("board");
for (let i = 0; i < 64; i++) {
if (i % 8 == 0) {
const label = document.createElement("div");
label.classList.add("label");
label.textContent = ["h", "g", "f", "e", "d", "c", "b", "a"][i / 8];
board.appendChild(label);
}
const square = document.createElement("div");
square.classList.add("square");
const shift = Math.floor(i / 8);
square.classList.add((i + shift) % 2 ? "dark" : "light");
const bitIndex = (i % 8) - 8 * Math.floor(i / 8) + 56;
square.id = 'square-' + bitIndex.toString();
checkForPiece(square, bitIndex);
square.onclick = (e) => {
if (!e.ctrlKey) {
const piece = checkForPiece(square, bitIndex, false);
if (
(hoveringPiece < 0 && piece == null) ||
(hoveringPiece >= 0 && piece != null)
) return;
if (hoveringPiece < 0) {
setHoverpiece(piece);
square.style.backgroundImage = `none`;
bitboards[piece] &= ~(1n << BigInt(bitIndex));
} else {
square.style.backgroundImage = `url(${assets[hoveringPiece]})`;
bitboards[hoveringPiece] |= (1n << BigInt(bitIndex));
setHoverpiece(-1);
}
return;
}
const selected = square.classList.contains("selected");
selectedAction(0, bitIndex, !selected, output);
if (selected) {
square.classList.remove("selected");
} else {
square.classList.add("selected");
}
};
board.appendChild(square);
}
const label = document.createElement("div");
label.classList.add("horizontal_label");
board.appendChild(label);
for (let i = 1; i < 9; i++) {
const label = document.createElement("div");
label.classList.add("horizontal_label");
label.textContent = i;
board.appendChild(label);
}
const mouse = document.getElementById("mouse");
function setHoverpiece(i) {
hoveringPiece = i;
if (i < 0) {
mouse.style.backgroundImage = `none`;
return;
}
mouse.style.backgroundImage = `url(${assets[i]})`;
}
window.onmousemove = (e) => {
const x = e.clientX;
const y = e.clientY;
mouse.style.left = x.toString() + 'px';
mouse.style.top = y.toString() + 'px';
}
}
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