skeleton of common js
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Magnus Ulimoen
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<!doctype html>
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<!--https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Tutorial/Adding_2D_content_to_a_WebGL_context-->
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="">
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<head>
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<meta charset="utf-8" />
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<meta name="generator" content="by-hand" />
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<meta name="viewpost" context="width=device-width, inital-scale=1.0, user-scalable=yes" />
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<title>ΣBP Solver</title>
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<link rel="stylesheet" type="text/css" href="style.css">
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<script async type="module" src="main.js"></script>
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</head>
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<body>
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<canvas id="glCanvas"></canvas>
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</body>
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<div class="vertical-menu" id="menu">
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<div class="menu-item">
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<p class="menu-header">Choose an equation set</p>
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<select id="eq-set" name="eq-set">
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<option value="euler"/> Euler</option>
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<option value="maxwell"/> Maxwell</option>
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<option value="shallow"/> Shallow Water</option>
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</select>
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<p>
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And here will be specific content for the solver in question
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</p>
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</div>
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<div class="grid menu-item">
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<p class="menu-header">Grid settings:</p>
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x: x0, yn, n<br/>
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y: y0, yn, n<br/>
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Curvilinear? Diamond shaped domain?
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</div>
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<div class="gen_set menu-item">
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<p class="menu-header">General settings</p>
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</div>
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<div class="about menu-item">
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<p class="menu-header">About</p>
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<p>More information can be found along with the <a href="https://ulimoen.dev/git/mulimoen/SBPonWEB">source code</a>.</p>
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</div>
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</div>
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<div class="controls">
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<button title="Menu" class="control-item" id="toggle-menu" type="button">☰</button>
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<button title="Play/pause" class="control-item" id="toggle-playing">▶️/⏸️</button>
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<button title="Reset" class="control-item" id="reset">🔄️</button>
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</div>
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</html>
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function lineProgram(ctx) {
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const LINE_VERTEX_SHADER = String.raw`
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#version 100
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attribute mediump float aX;
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attribute mediump float aY;
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uniform vec4 uBbox;
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void main() {
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mediump float x = (aX - uBbox.x)*uBbox.y;
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mediump float y = (aY - uBbox.z)*uBbox.w;
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gl_Position = vec4(2.0*x - 1.0, 2.0*y - 1.0, 1.0, 1.0);
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}
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`;
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const LINE_FRAGMENT_SHADER = String.raw`
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#version 100
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void main() {
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gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
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}
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`;
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const program = ctx.createProgram();
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const vsShader = ctx.createShader(ctx.VERTEX_SHADER);
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ctx.shaderSource(vsShader, LINE_VERTEX_SHADER);
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const fsShader = ctx.createShader(ctx.FRAGMENT_SHADER);
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ctx.shaderSource(fsShader, LINE_FRAGMENT_SHADER);
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ctx.compileShader(vsShader);
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ctx.compileShader(fsShader);
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ctx.attachShader(program, vsShader);
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ctx.attachShader(program, fsShader);
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ctx.linkProgram(program);
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ctx.validateProgram(program);
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if (!ctx.getProgramParameter(program, ctx.LINK_STATUS)) {
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console.error(`Linking of lineProgram failed: ${ctx.getProgramInfoLog(program)}`);
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console.error(`vertex shader infolog: ${ctx.getShaderInfoLog(vsShader)}`);
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console.error(`fragment shader infolog: ${ctx.getShaderInfoLog(fsShader)}`);
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return null;
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}
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ctx.deleteShader(vsShader);
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ctx.deleteShader(fsShader);
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const uBbox = ctx.getUniformLocation(program, "uBbox");
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return {program: program, uniforms: {"uBbox": uBbox}};
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};
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(async function run() {
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const canvas = document.getElementById("glCanvas");
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const gl = canvas.getContext("webgl");
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if (gl === null) {
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console.error("Unable to initialise WebGL");
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return;
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}
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console.info("Successfully opened webgl canvas");
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const width = 23;
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const height = 21;
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const x = new Float32Array(width * height);
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const y = new Float32Array(width * height);
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for (let j = 0; j < height; j += 1) {
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for (let i = 0; i < width; i += 1) {
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const n = width*j + i;
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x[n] = i / (width - 1.0);
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y[n] = j / (height - 1.0);
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}
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}
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const bbox = [+Number(Infinity), -Number(Infinity), +Number(Infinity), -Number(Infinity)];
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for (let i = 0; i < width*height; i += 1) {
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bbox[0] = Math.min(bbox[0], x[i]);
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bbox[1] = Math.max(bbox[1], x[i]);
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bbox[2] = Math.min(bbox[2], y[i]);
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bbox[3] = Math.max(bbox[3], y[i]);
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}
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// A nice pink to show missing values
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gl.clearColor(1.0, 0.753, 0.796, 1.0);
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gl.clearDepth(1.0);
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gl.enable(gl.DEPTH_TEST);
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gl.depthFunc(gl.LEQUAL);
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gl.disable(gl.CULL_FACE);
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const lineProg = lineProgram(gl);
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gl.useProgram(lineProg.program);
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// Transfer x, y to cpu, prepare fBuffer
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const xBuffer = gl.createBuffer();
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const yBuffer = gl.createBuffer();
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{
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let loc = gl.getAttribLocation(lineProg.program, "aX");
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gl.bindBuffer(gl.ARRAY_BUFFER, xBuffer);
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gl.vertexAttribPointer(loc, 1, gl.FLOAT, false, 0, 0);
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gl.enableVertexAttribArray(loc);
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gl.bufferData(gl.ARRAY_BUFFER, x, gl.STATIC_DRAW);
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loc = gl.getAttribLocation(lineProg.program, "aY");
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gl.bindBuffer(gl.ARRAY_BUFFER, yBuffer);
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gl.vertexAttribPointer(loc, 1, gl.FLOAT, false, 0, 0);
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gl.enableVertexAttribArray(loc);
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gl.bufferData(gl.ARRAY_BUFFER, y, gl.STATIC_DRAW);
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}
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// Create triangles covering the domain
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const lineIdxBuffer = new Uint16Array(2*width*height - 1);
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{
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let n = 0;
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for (let j = 0; j < height; j++) {
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for (let i = 0; i < width; i++) {
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if (j % 2 == 0) {
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lineIdxBuffer[n] = width*j + i;
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} else {
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lineIdxBuffer[n] = width*(j + 1) - i - 1;
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}
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n += 1;
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}
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}
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let m = lineIdxBuffer[n-1];
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let updown = "down";
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let lr;
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if (height % 2 === 0) {
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lr = "left";
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} else {
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lr = "right";
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}
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for (let i = 0; i < width; i++) {
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for (let j = 0; j < height-1; j++) {
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if (updown === "up") {
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m += width;
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} else {
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m -= width;
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}
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lineIdxBuffer[n] = m;
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n += 1;
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}
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if (n === 2*width*height - 1) {
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continue;
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}
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if (lr === "left") {
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m += 1;
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} else {
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m -= 1;
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}
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lineIdxBuffer[n] = m;
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n += 1;
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if (updown === "down") {
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updown = "up";
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} else {
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updown = "down";
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}
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}
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}
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const indexBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, lineIdxBuffer, gl.STATIC_DRAW);
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gl.lineWidth(1.0);
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gl.uniform4f(lineProg.uniforms.uBbox, bbox[0], 1.0/(bbox[1] - bbox[0]), bbox[2], 1.0/(bbox[3] - bbox[2]));
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function drawMe() {
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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gl.drawElements(gl.LINE_STRIP, 2*width*height - 1, gl.UNSIGNED_SHORT, 0);
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window.requestAnimationFrame(drawMe);
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}
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function resizeCanvas() {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
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}
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resizeCanvas();
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window.addEventListener("resize", resizeCanvas, false);
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window.requestAnimationFrame(drawMe);
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const menu = document.getElementById("menu");
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const menu_toggle = document.getElementById("toggle-menu");
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menu_toggle.addEventListener("click", () => {
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if (menu.style.visibility === "") {
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menu.style.visibility = "hidden";
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} else {
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menu.style.visibility = "";
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}
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});
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const eq_sel = document.getElementById("eq-set");
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eq_sel.addEventListener("change", (e) => {
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console.log("equation changed, wants: ", e.target.value);
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});
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const play_button = document.getElementById("toggle-playing");
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const reset_button = document.getElementById("reset");
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}());
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@ -0,0 +1,9 @@
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* { margin: 0; padding: 0; overflow: hidden; }
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html, body { width:100%; height:100%; }
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canvas { display:block; position: fixed; z-index: 1; }
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select#eq-set { width: 100%; }
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.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; }
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.menu-header { font-weight: bold; }
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.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; }
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.controls:hover { opacity: 1.0; }
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.menu-item { flex-shrink: 0; }
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