280 lines
10 KiB
HTML
280 lines
10 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Wolfystein</title>
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<meta charset="UTF-8">
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</head>
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<body style="background: black;">
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<img src="skybox.png" id="skybox" style="display: none;">
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<canvas id="c" style="position: absolute;"></canvas>
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<p id="debug" style="color: white;"></p> <!-- a debug/cheat CONSOLE would be really cool -->
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<script>
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// screen constants
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const resx = 100;
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const resy = 60;
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const pixSize = 6;
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const focal = 1;
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const rayiter = 100;
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// world
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var map = [];
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const tileColors = [
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[194, 228, 255], // sky
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[250, 250, 250],
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[250, 140, 170]
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];
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for (let z = 0; z < 32; z++) {
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map.push([]);
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for (let y = 0; y < 32; y++) {
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map[z].push([]);
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for (let x = 0; x < 32; x++) {
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map[z][y].push(Math.random() * 3 >> 0);
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}
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}
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}
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// skybox
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{
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let img = document.querySelector('#skybox');
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let canvas = document.createElement('canvas');
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let context = canvas.getContext('2d');
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canvas.width = img.width;
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canvas.height = img.height;
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context.drawImage(img, 0, 0);
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// TODO use -> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8ClampedArray
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const skybox = context.getImageData(0, 0, img.width-1, img.height-1).data;
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}
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// player data
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var px = -2;
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var py = -2;
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var pz = 2;
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var ppitch = -0.3;
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var pyaw = -0.7;
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const pspeed = 7.5;
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const pturnspeed = 0.01;
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// input
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var left = false;
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var right = false;
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var up = false;
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var down = false;
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var space = false;
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var shift = false;
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var mdx = 0;
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var mdy = 0;
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var focused = false;
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// initialize debug
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var debug = document.getElementById('debug');
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// initialize screen
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var c = document.getElementById('c');
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var ctx = c.getContext('2d');
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c.width = resx * pixSize;
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c.height = resy * pixSize;
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ctx.clearRect(0, 0, resx * pixSize, resy * pixSize);
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document.addEventListener('keydown', function(event) {
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if (event.keyCode == 65) { left = true; }
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if (event.keyCode == 68) { right = true; }
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if (event.keyCode == 87) { up = true; }
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if (event.keyCode == 83) { down = true; }
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if (event.keyCode == 32) { space = true; }
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if (event.keyCode == 16) { shift = true; }
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}, true);
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document.addEventListener('keyup', function(event) {
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if (event.keyCode == 65) { left = false; }
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if (event.keyCode == 68) { right = false; }
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if (event.keyCode == 87) { up = false; }
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if (event.keyCode == 83) { down = false; }
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if (event.keyCode == 32) { space = false; }
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if (event.keyCode == 16) { shift = false; }
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}, true);
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c.addEventListener("click", async () => { // https://developer.mozilla.org/en-US/docs/Web/API/Pointer_Lock_API
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await c.requestPointerLock({
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unadjustedMovement: true,
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});
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});
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c.addEventListener('mousemove', function(event) {
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mdx += event.movementX;
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mdy += event.movementY;
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}, true);
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document.addEventListener("pointerlockchange", function(event) {
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focused = document.pointerLockElement === c;
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}, false);
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var prevTimestamp = 0;
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async function update(timestamp) {
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// get important info
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let dt = (timestamp - prevTimestamp);
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prevTimestamp = timestamp;
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debug.innerHTML =
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"dt: " + dt + "ms<br>px: " + ((px * 100 >> 0) / 100) +
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"u<br>py: " + ((py * 100 >> 0) / 100) +
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"u<br>pz: " + ((pz * 100 >> 0) / 100) +
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"u<br>ppitch: " + ((ppitch * 100 >> 0) / 100) +
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"rad<br>pyaw: " + ((pyaw * 100 >> 0) / 100) +
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"rad";
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// if (dt < 50) { // fps limiter
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// await new Promise(r => setTimeout(r, 50 - dt));
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// dt = 50;
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// }
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dt /= 1000;
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// center canvas
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c.style.left = (window.innerWidth - c.width) / 2 + "px";
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c.style.top = (window.innerHeight - c.height) / 2 + "px";
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// input
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if (focused) {
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if (left) { px -= Math.sin(pyaw) * pspeed * dt; py -= Math.cos(pyaw) * pspeed * dt; }
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if (right) { px += Math.sin(pyaw) * pspeed * dt; py += Math.cos(pyaw) * pspeed * dt; }
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if (up) { px += Math.cos(pyaw) * pspeed * dt; py -= Math.sin(pyaw) * pspeed * dt; }
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if (down) { px -= Math.cos(pyaw) * pspeed * dt; py += Math.sin(pyaw) * pspeed * dt; }
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if (space) { pz += pspeed * dt; }
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if (shift) { pz -= pspeed * dt; }
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ppitch -= mdy * pturnspeed;
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ppitch = Math.max(-Math.PI / 2, Math.min(Math.PI / 2, ppitch));
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pyaw -= mdx * pturnspeed;
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pyaw = (pyaw + Math.PI * 2) % (Math.PI * 2);
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mdx = 0;
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mdy = 0;
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}
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// draw
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for (let x=resx;x--;) {
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let h = Math.atan((x / resx - 0.5) / focal);
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let sh = Math.sin(h);
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let ch = Math.cos(h);
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let syaw = Math.sin(-pyaw);
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let cyaw = Math.cos(-pyaw);
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for (let y=resy;y--;) {
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let raydata = raycast(
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px, py, pz,
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ppitch - Math.atan((y / resy - 0.5) / focal * resy / resx),
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sh, ch, syaw, cyaw
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);
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if (raydata.type == 0) {
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// skybox (have to get UV coords...)
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ctx.fillStyle =
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'rgba(' +
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(raydata.dx * 127 + 127)
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+ ',' +
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(raydata.dy * 127 + 127)
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+ ',' +
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(raydata.dz * 127 + 127)
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+ ',1)';
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} else {
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// map
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let shadow = Math.pow(1 / (raydata.dist + 1), 0.7) / 2 + 0.5;
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if (raydata.x % 1 > 0.99) {
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shadow *= 1.15;
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} else if (raydata.y % 1 > 0.99) {
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shadow *= 1.25;
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} else if (raydata.z % 1 > 0.99) {
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shadow *= 1.5;
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}
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ctx.fillStyle =
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'rgba(' +
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(tileColors[raydata.type][0] * shadow)
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+ ',' +
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(tileColors[raydata.type][1] * shadow)
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+ ',' +
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(tileColors[raydata.type][2] * shadow)
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+ ',1)';
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}
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ctx.fillRect(x * pixSize, y * pixSize, pixSize, pixSize);
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}
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}
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// loop
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requestAnimationFrame(update);
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}
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// sends a ray from the given point in the given direction, returns data based on the raycast
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// https://math.stackexchange.com/questions/2645689/what-is-the-parametric-equation-of-a-rotated-ellipse-given-the-angle-of-rotatio
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function raycast(x, y, z, pitch, sh, ch, syaw, cyaw) {
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let dist = 0.0;
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let r = Math.cos(pitch);
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let dx = (r * ch * cyaw - sh * syaw);
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let dy = (r * ch * syaw + sh * cyaw);
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let dz = Math.sqrt(1 - dx * dx - dy * dy) * Math.sign(pitch);
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// cast a ray into the map
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let signX = Math.sign(dx);
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let signY = Math.sign(dy);
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let signZ = Math.sign(dz);
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for (let i=rayiter;i--;) {
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if (!(x < 0 || y < 0 || z < 0 || (x >> 0) >= map[0][0].length || (y >> 0) >= map[0].length || (z >> 0) >= map.length)) {
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let type = map[z >> 0][y >> 0][x >> 0];
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if (type != 0) {
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return {
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dist: dist,
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type: type,
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x: x,
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y: y,
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z: z
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};
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}
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}
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// find smallest f / d (ray length), use for step
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let step =
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Math.min(
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Math.abs(((signX == 1 ? Math.floor(x+1) : Math.ceil(x-1)) - x) / dx),
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Math.min(
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Math.abs(((signY == 1 ? Math.floor(y+1) : Math.ceil(y-1)) - y) / dy),
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Math.abs(((signZ == 1 ? Math.floor(z+1) : Math.ceil(z-1)) - z) / dz)
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)) * 1.01; // go slightly more inwards instead of on the edge
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x += dx * step;
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y += dy * step;
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z += dz * step;
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dist += step;
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}
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// didn't hit anything
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return {
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dist: 0,
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type: 0,
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dx: dx, // for skybox UV mapping
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dy: dy,
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dz: dz
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};
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}
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requestAnimationFrame(update);
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</script>
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</body>
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</html>
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