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flail.html
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<!DOCTYPE html>
<html>
<head>
<title>Flick and Flail</title>
<link rel="icon" href="res/favicon.ico">
<script id="clr_vert_sh" type="text/glsl">#version 300 es
in vec2 pos;
in vec2 off;
void main() {
gl_Position = vec4(pos + off, 0, 1);
}
</script>
<script id="clr_frag_sh" type="text/glsl">#version 300 es
precision mediump float;
uniform vec3 clr;
out vec4 outClr;
void main() {
outClr = vec4(clr, 1);
}
</script>
<script type="text/javascript">
const TAU = 2 * Math.PI;
const kResolution = 800;
const kFrameRate = 60;
const kMapRad2 = 2.01;
const kEnemyRad2 = 30 / (kResolution * kResolution);
const kSpring = 0.001;
const kDamping = 0.001;
const kBounce = 0.9;
const kSpawnSlices = 100;
const kSpawnRateBase = 10;
const kSpawnRateGrowth = 0.03 * kSpawnRateBase;
const kSpawnCycle = 240;
const kSpawnRotation = [0.28, -0.22, 0.12, -0.16];
const kSpawnN = kSpawnRotation.length;
const kSpawnVelocitySpread = 0.25 * TAU;
const kEnemySpeed = 0.14;
function r2(x, y) { return x * x + y * y; }
function d2(x0, y0, x1, y1) { return r2(x0 - x1, y0 - y1); }
function cycle(t) { return (1 + Math.cos(TAU * t)) / 2; }
function safeInt(x) {
y = parseInt(x);
return isNaN(y) ? 0 : y;
}
class EnemyBuffer {
constructor() {
this.cap = 1;
this.length = 0;
this.pos = null;
this.vel = null;
this._resize();
}
_resize() {
const n = this.length << 1;
const m = this.cap << 1;
const p = new Float32Array(m);
const v = new Float32Array(m);
for (let i = 0; i < n; ++i) {
p[i] = this.pos[i];
v[i] = this.vel[i];
}
this.pos = p;
this.vel = v;
}
update(ux, uy) {
const n = this.length << 1;
for (let i = 0; i < n; ++i) {
this.pos[i] += this.vel[i];
}
for (let i = 0; i < this.length;) {
const j = i << 1;
const px = this.pos[j];
const py = this.pos[j + 1];
if (r2(px, py) > kMapRad2) {
this.del(i);
} else if(d2(px, py, ux, uy) < kEnemyRad2) {
return true;
} else {
++i;
}
}
return false;
}
add(x, y, u, v) {
if (this.length >= this.cap) {
this.cap <<= 1;
this._resize();
}
let n = this.length << 1;
this.pos[n] = x;
this.vel[n] = u;
++n;
this.pos[n] = y;
this.vel[n] = v;
++this.length;
}
del(i) {
--this.length;
if (i < this.length) {
let n = this.length << 1;
let j = i << 1;
this.pos[j] = this.pos[n];
this.vel[j] = this.vel[n];
++n;
++j;
this.pos[j] = this.pos[n];
this.vel[j] = this.vel[n];
}
}
clear() {
this.length = 0;
}
}
function baseSpawnRate(t, time) {
let sum = 0;
for (let i = 0; i < kSpawnN; ++i) {
const speed = kSpawnRotation[i];
const clover = cycle((i + 1) * (t + speed * time) / TAU)
const pulse = cycle((time / kSpawnCycle) - (i + 0.5) / kSpawnN);
sum += clover * Math.pow(pulse, 2 * kSpawnN);
}
return Math.pow(sum, 2) * (kSpawnRateBase + kSpawnRateGrowth * time);
}
class Spawner {
constructor(enemies) {
this.enemies = enemies;
this.a = null;
this.clear();
}
clear() {
this.a = new Float64Array(kSpawnSlices);
for (let i = 0; i < kSpawnSlices; ++i) {
this.a[i] = Math.random();
}
}
update(time) {
for (let i = 0; i < kSpawnSlices; ++i) {
const t = i * TAU / kSpawnSlices;
this.a[i] += baseSpawnRate(t, time) / (kFrameRate * kSpawnSlices);
while (this.a[i] >= 1) {
this._spawn(t);
this.a[i] -= 1;
}
}
}
_spawn(t) {
const st = t + Math.random() * TAU / kSpawnSlices;
const sx = Math.cos(st);
const sy = Math.sin(st);
const d = Math.max(Math.abs(sx), Math.abs(sy))
const vt = st + 0.5 * TAU + (Math.random() - 0.5) * kSpawnVelocitySpread;
const vr = kEnemySpeed / kFrameRate;
this.enemies.add(sx / d, sy / d, vr * Math.cos(vt), vr * Math.sin(vt));
}
}
function runGame(body, canvas, scoreText, hiscoreText) {
const gl = canvas.getContext('webgl2');
if (gl == null) {
console.error('Failed to create web GL 2 context.');
return;
}
gl.clearColor(0.0, 0.0, 0.0, 1);
const halfResX = canvas.clientWidth / 2;
const halfResY = canvas.clientHeight / 2;
let mouseX = 0;
let mouseY = 0;
const mouseHandler = (e) => {
const r = canvas.getBoundingClientRect();
mouseX = (Math.floor(e.clientX - r.left) / halfResX) - 1;
mouseY = 1 - (Math.floor(e.clientY - r.top) / halfResY);
};
body.addEventListener('mousemove', e => mouseHandler(e));
canvas.addEventListener('contextmenu', e => e.preventDefault());
let playerX = 0;
let playerY = 0;
let playerU = 0;
let playerV = 0;
const loadShader = (vert_id, frag_id) => {
const load = (type, src_id) => {
const shader = gl.createShader(type);
gl.shaderSource(shader, document.getElementById(src_id).innerText);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
console.error('Shader compile error\n', gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
return null;
}
return shader;
}
const vertexShader = load(gl.VERTEX_SHADER, vert_id);
const fragmentShader = load(gl.FRAGMENT_SHADER, frag_id);
const sh = gl.createProgram();
gl.attachShader(sh, vertexShader);
gl.attachShader(sh, fragmentShader);
gl.linkProgram(sh);
if (!gl.getProgramParameter(sh, gl.LINK_STATUS)) {
console.error('Shader link error\n', gl.getProgramInfoLog(sh));
return null;
}
gl.useProgram(sh);
return sh;
}
const shDot = loadShader('clr_vert_sh', 'clr_frag_sh');
if (!shDot) return;
const uDotClr = gl.getUniformLocation(shDot, 'clr');
const s = 2 / kResolution;
const bufPos = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufPos);
gl.bufferData(
gl.ARRAY_BUFFER, new Float32Array([-s, -s, s, -s, s, s, -s, s]),
gl.STATIC_DRAW);
const idDotPos = gl.getAttribLocation(shDot, 'pos');
gl.enableVertexAttribArray(idDotPos);
gl.vertexAttribPointer(idDotPos, 2, gl.FLOAT, false, 0, 0);
const bufOff = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufOff);
const idDotOff = gl.getAttribLocation(shDot, 'off');
gl.enableVertexAttribArray(idDotOff);
gl.vertexAttribPointer(idDotOff, 2, gl.FLOAT, false, 0, 0);
gl.vertexAttribDivisor(idDotOff, 1);
const bufLine = gl.createBuffer();
const scratch = new Float32Array([0, 0, 0, 0]);
const enemies = new EnemyBuffer();
const spawner = new Spawner(enemies);
let time = 0;
let score = 0;
let hiscore = safeInt(window.localStorage.getItem("hiscore"));
hiscoreText.innerText = hiscore;
const gameOver = () => {
if (score > hiscore) {
hiscore = score;
hiscoreText.innerText = hiscore;
window.localStorage.setItem("hiscore", hiscore);
}
score = 0;
scoreText.innerText = score;
time = 0;
playerX = 0;
playerY = 0;
playerU = 0;
playerV = 0;
mouseX = 0;
mouseY = 0;
enemies.clear();
spawner.clear();
};
const updatePlayerAxis = (m, p, u) => {
u += kSpring * (m - p) - kDamping * u;
p += u;
if (p > 1) {
u *= -kBounce;
p = 1;
} else if (p < -1) {
u *= -kBounce;
p = -1;
}
return [p, u];
};
let oldt = 0;
let fps = 60;
const update = () => {
time += 1 / kFrameRate;
spawner.update(time);
const newt = performance.now();
fps += 0.03 * (1000 / (newt - oldt) - fps);
oldt = newt;
[playerX, playerU] = updatePlayerAxis(mouseX, playerX, playerU);
[playerY, playerV] = updatePlayerAxis(mouseY, playerY, playerV);
if (enemies.update(playerX, playerY)) {
gameOver();
return;
}
score += enemies.length;
scoreText.innerText = score;
};
const draw = () => {
gl.clear(gl.COLOR_BUFFER_BIT);
// Force link.
const g = 0.1 * d2(mouseX, mouseY, playerX, playerY);
scratch[0] = mouseX;
scratch[1] = mouseY;
scratch[2] = playerX;
scratch[3] = playerY;
gl.bindBuffer(gl.ARRAY_BUFFER, bufLine);
gl.bufferData(gl.ARRAY_BUFFER, scratch, gl.DYNAMIC_DRAW, 0, 4);
gl.enableVertexAttribArray(idDotPos);
gl.vertexAttribPointer(idDotPos, 2, gl.FLOAT, false, 0, 0);
scratch[0] = 0;
scratch[1] = 0;
gl.bindBuffer(gl.ARRAY_BUFFER, bufOff);
gl.bufferData(gl.ARRAY_BUFFER, scratch, gl.DYNAMIC_DRAW, 0, 2);
gl.uniform3f(uDotClr, g, g, g);
gl.drawArrays(gl.LINE_STRIP, 0, 2);
// Enemies.
gl.bindBuffer(gl.ARRAY_BUFFER, bufPos);
gl.enableVertexAttribArray(idDotPos);
gl.vertexAttribPointer(idDotPos, 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, bufOff);
gl.bufferData(gl.ARRAY_BUFFER, enemies.pos, gl.DYNAMIC_DRAW, 0,
enemies.length << 1);
gl.uniform3f(uDotClr, 1, 0.3, 0);
gl.drawArraysInstanced(gl.TRIANGLE_FAN, 0, 4, enemies.length);
// Mouse.
scratch[0] = mouseX;
scratch[1] = mouseY;
gl.bindBuffer(gl.ARRAY_BUFFER, bufOff);
gl.bufferData(gl.ARRAY_BUFFER, scratch, gl.DYNAMIC_DRAW, 0, 2);
gl.uniform3f(uDotClr, 1, 1, 1);
gl.drawArraysInstanced(gl.TRIANGLE_FAN, 0, 4, 1);
// Player.
scratch[0] = playerX;
scratch[1] = playerY;
gl.bindBuffer(gl.ARRAY_BUFFER, bufOff);
gl.bufferData(gl.ARRAY_BUFFER, scratch, gl.DYNAMIC_DRAW, 0, 2);
gl.uniform3f(uDotClr, 0, 0.7, 1);
gl.drawArraysInstanced(gl.TRIANGLE_FAN, 0, 4, 1);
};
const loop = () => {
update();
draw();
window.requestAnimationFrame(loop);
};
window.requestAnimationFrame(loop);
}
function onLoad() {
runGame(
document.body, document.getElementById('game_view'),
document.getElementById('score'), document.getElementById('hiscore'));
}
window.addEventListener('load', onLoad);
</script>
<style>
html {
display: flex;
flex-direction: column;
min-height: 100%;
}
body {
background-color: #212121;
margin: 0;
flex-grow: 1;
}
#head {
background-color: #424242;
width: 100%;
display: flex;
justify-content: space-around;
margin-bottom: 16px;
}
h1, #index {
color: #ffc107;
text-align: center;
font-family: monospace;
font-size: 42px;
flex-grow: 1;
padding: 16px;
margin: 0;
}
#index {
color: #ff5722;
text-decoration: none;
flex-grow: 0;
}
h2 {
color: #ff5722;
font-family: monospace;
}
a {
color: #ffc107;
font-family: monospace;
font-size: 16px;
cursor: pointer;
text-decoration: underline;
}
#wrap {
display: flex;
padding: 0 16px;
color: #f5f5f5;
font-family: monospace;
font-size: 16px;
flex-direction: column;
align-items: center;
gap: 8px;
}
#score_row {
display: flex;
flex-direction: row;
gap: 64px;
}
canvas {
cursor: none;
}
</style>
</head>
<body>
<div id="head">
<a id="index" href="index.html"><</a>
<h1>Flick and Flail</h1>
</div>
<div id="wrap">
<div id="score_row">
<div>Score: <span id="score">0</span></div>
<div>High score: <span id="hiscore">0</span></div>
</div>
<canvas id="game_view" width="800" height="800"></canvas>
</div>
</body>
</html>