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skeleton of common js

This commit is contained in:
Magnus Ulimoen 2020-05-24 16:52:23 +02:00
parent 51397ff34d
commit d1e89bf20e
3 changed files with 265 additions and 0 deletions
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<!doctype html>
<!--https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Tutorial/Adding_2D_content_to_a_WebGL_context-->
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="">
<head>
<meta charset="utf-8" />
<meta name="generator" content="by-hand" />
<meta name="viewpost" context="width=device-width, inital-scale=1.0, user-scalable=yes" />
<title>ΣBP Solver</title>
<link rel="stylesheet" type="text/css" href="style.css">
<script async type="module" src="main.js"></script>
</head>
<body>
<canvas id="glCanvas"></canvas>
</body>
<div class="vertical-menu" id="menu">
<div class="menu-item">
<p class="menu-header">Choose an equation set</p>
<select id="eq-set" name="eq-set">
<option value="euler"/> Euler</option>
<option value="maxwell"/> Maxwell</option>
<option value="shallow"/> Shallow Water</option>
</select>
<p>
And here will be specific content for the solver in question
</p>
</div>
<div class="grid menu-item">
<p class="menu-header">Grid settings:</p>
x: x0, yn, n<br/>
y: y0, yn, n<br/>
Curvilinear? Diamond shaped domain?
</div>
<div class="gen_set menu-item">
<p class="menu-header">General settings</p>
</div>
<div class="about menu-item">
<p class="menu-header">About</p>
<p>More information can be found along with the <a href="https://ulimoen.dev/git/mulimoen/SBPonWEB">source code</a>.</p>
</div>
</div>
<div class="controls">
<button title="Menu" class="control-item" id="toggle-menu" type="button">☰</button>
<button title="Play/pause" class="control-item" id="toggle-playing">▶️/⏸️</button>
<button title="Reset" class="control-item" id="reset">🔄️</button>
</div>
</html>

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function lineProgram(ctx) {
const LINE_VERTEX_SHADER = String.raw`
#version 100
attribute mediump float aX;
attribute mediump float aY;
uniform vec4 uBbox;
void main() {
mediump float x = (aX - uBbox.x)*uBbox.y;
mediump float y = (aY - uBbox.z)*uBbox.w;
gl_Position = vec4(2.0*x - 1.0, 2.0*y - 1.0, 1.0, 1.0);
}
`;
const LINE_FRAGMENT_SHADER = String.raw`
#version 100
void main() {
gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
}
`;
const program = ctx.createProgram();
const vsShader = ctx.createShader(ctx.VERTEX_SHADER);
ctx.shaderSource(vsShader, LINE_VERTEX_SHADER);
const fsShader = ctx.createShader(ctx.FRAGMENT_SHADER);
ctx.shaderSource(fsShader, LINE_FRAGMENT_SHADER);
ctx.compileShader(vsShader);
ctx.compileShader(fsShader);
ctx.attachShader(program, vsShader);
ctx.attachShader(program, fsShader);
ctx.linkProgram(program);
ctx.validateProgram(program);
if (!ctx.getProgramParameter(program, ctx.LINK_STATUS)) {
console.error(`Linking of lineProgram failed: ${ctx.getProgramInfoLog(program)}`);
console.error(`vertex shader infolog: ${ctx.getShaderInfoLog(vsShader)}`);
console.error(`fragment shader infolog: ${ctx.getShaderInfoLog(fsShader)}`);
return null;
}
ctx.deleteShader(vsShader);
ctx.deleteShader(fsShader);
const uBbox = ctx.getUniformLocation(program, "uBbox");
return {program: program, uniforms: {"uBbox": uBbox}};
};
(async function run() {
const canvas = document.getElementById("glCanvas");
const gl = canvas.getContext("webgl");
if (gl === null) {
console.error("Unable to initialise WebGL");
return;
}
console.info("Successfully opened webgl canvas");
const width = 23;
const height = 21;
const x = new Float32Array(width * height);
const y = new Float32Array(width * height);
for (let j = 0; j < height; j += 1) {
for (let i = 0; i < width; i += 1) {
const n = width*j + i;
x[n] = i / (width - 1.0);
y[n] = j / (height - 1.0);
}
}
const bbox = [+Number(Infinity), -Number(Infinity), +Number(Infinity), -Number(Infinity)];
for (let i = 0; i < width*height; i += 1) {
bbox[0] = Math.min(bbox[0], x[i]);
bbox[1] = Math.max(bbox[1], x[i]);
bbox[2] = Math.min(bbox[2], y[i]);
bbox[3] = Math.max(bbox[3], y[i]);
}
// A nice pink to show missing values
gl.clearColor(1.0, 0.753, 0.796, 1.0);
gl.clearDepth(1.0);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
gl.disable(gl.CULL_FACE);
const lineProg = lineProgram(gl);
gl.useProgram(lineProg.program);
// Transfer x, y to cpu, prepare fBuffer
const xBuffer = gl.createBuffer();
const yBuffer = gl.createBuffer();
{
let loc = gl.getAttribLocation(lineProg.program, "aX");
gl.bindBuffer(gl.ARRAY_BUFFER, xBuffer);
gl.vertexAttribPointer(loc, 1, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(loc);
gl.bufferData(gl.ARRAY_BUFFER, x, gl.STATIC_DRAW);
loc = gl.getAttribLocation(lineProg.program, "aY");
gl.bindBuffer(gl.ARRAY_BUFFER, yBuffer);
gl.vertexAttribPointer(loc, 1, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(loc);
gl.bufferData(gl.ARRAY_BUFFER, y, gl.STATIC_DRAW);
}
// Create triangles covering the domain
const lineIdxBuffer = new Uint16Array(2*width*height - 1);
{
let n = 0;
for (let j = 0; j < height; j++) {
for (let i = 0; i < width; i++) {
if (j % 2 == 0) {
lineIdxBuffer[n] = width*j + i;
} else {
lineIdxBuffer[n] = width*(j + 1) - i - 1;
}
n += 1;
}
}
let m = lineIdxBuffer[n-1];
let updown = "down";
let lr;
if (height % 2 === 0) {
lr = "left";
} else {
lr = "right";
}
for (let i = 0; i < width; i++) {
for (let j = 0; j < height-1; j++) {
if (updown === "up") {
m += width;
} else {
m -= width;
}
lineIdxBuffer[n] = m;
n += 1;
}
if (n === 2*width*height - 1) {
continue;
}
if (lr === "left") {
m += 1;
} else {
m -= 1;
}
lineIdxBuffer[n] = m;
n += 1;
if (updown === "down") {
updown = "up";
} else {
updown = "down";
}
}
}
const indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, lineIdxBuffer, gl.STATIC_DRAW);
gl.lineWidth(1.0);
gl.uniform4f(lineProg.uniforms.uBbox, bbox[0], 1.0/(bbox[1] - bbox[0]), bbox[2], 1.0/(bbox[3] - bbox[2]));
function drawMe() {
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawElements(gl.LINE_STRIP, 2*width*height - 1, gl.UNSIGNED_SHORT, 0);
window.requestAnimationFrame(drawMe);
}
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
}
resizeCanvas();
window.addEventListener("resize", resizeCanvas, false);
window.requestAnimationFrame(drawMe);
const menu = document.getElementById("menu");
const menu_toggle = document.getElementById("toggle-menu");
menu_toggle.addEventListener("click", () => {
if (menu.style.visibility === "") {
menu.style.visibility = "hidden";
} else {
menu.style.visibility = "";
}
});
const eq_sel = document.getElementById("eq-set");
eq_sel.addEventListener("change", (e) => {
console.log("equation changed, wants: ", e.target.value);
});
const play_button = document.getElementById("toggle-playing");
const reset_button = document.getElementById("reset");
}());

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* { margin: 0; padding: 0; overflow: hidden; }
html, body { width:100%; height:100%; }
canvas { display:block; position: fixed; z-index: 1; }
select#eq-set { width: 100%; }
.vertical-menu { position: fixed; width: 30%; min-width: 200px; top: 0; bottom: 30px; z-index: 2; background-color: #eee; display: flex; flex-direction: column; justify-content: space-between; padding: 0.5em; overflow-y: auto; }
.menu-header { font-weight: bold; }
.controls { position: relative; z-index: 3; top: calc(100% - 30px); height: 30px; display: flex; align-items: center; width: 175px; justify-content: space-around; opacity: 0.5; }
.controls:hover { opacity: 1.0; }
.menu-item { flex-shrink: 0; }