mirror of
https://github.com/greggman/twgl.js.git
synced 2025-12-08 19:26:07 +00:00
211 lines
6.1 KiB
HTML
211 lines
6.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf8">
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<!--
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@license twgl.js Copyright (c) 2015, Gregg Tavares All Rights Reserved.
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Available via the MIT license.
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see: http://github.com/greggman/twgl.js for details
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-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<meta property="og:title" content="TWGL.js - text" />
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<meta property="og:type" content="website" />
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<meta property="og:image" content="http://twgljs.org/examples/screenshots/text.png" />
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<meta property="og:description" content="TWGL.js - text" />
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<meta property="og:url" content="http://twgljs.org" />
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<meta name="twitter:card" content="summary_large_image">
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<meta name="twitter:site" content="@greggman">
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<meta name="twitter:creator" content="@greggman">
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<meta name="twitter:domain" content="twgljs.org">
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<meta name="twitter:title" content="TWGL.js - text">
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<meta name="twitter:url" content="http://twgljs.org/examples/text.html">
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<meta name="twitter:description" content="TWGL.js - text">
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<meta name="twitter:image:src" content="http://twgljs.org/examples/screenshots/text.png">
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<link href="/resources/images/twgljs-icon.png" rel="shortcut icon" type="image/png">
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<title>twgl.js - text</title>
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<style>
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body {
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margin: 0;
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font-family: monospace;
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}
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canvas {
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display: block;
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width: 100vw;
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height: 100vh;
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}
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#b {
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position: absolute;
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top: 10px;
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width: 100%;
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text-align: center;
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z-index: 2;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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<div id="b"><a href="http://twgljs.org">twgl.js</a> - text</div>
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</body>
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<script id="vs" type="notjs">
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uniform mat4 u_worldViewProjection;
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attribute vec4 a_position;
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attribute vec2 a_texcoord;
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varying vec2 v_texcoord;
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void main() {
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v_texcoord = a_texcoord;
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gl_Position = u_worldViewProjection * a_position;
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}
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</script>
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<script id="fs" type="notjs">
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precision mediump float;
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varying vec2 v_texcoord;
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uniform sampler2D u_texture;
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uniform vec4 u_color;
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void main() {
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vec4 color = texture2D(u_texture, v_texcoord) * u_color;
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if (color.a < 0.1) {
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discard;
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}
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gl_FragColor = color;
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}
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</script>
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<script src="../dist/4.x/twgl-full.min.js"></script>
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<script src="../3rdparty/chroma.min.js"></script>
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<script>
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"use strict";
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twgl.setDefaults({attribPrefix: "a_"});
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const m4 = twgl.m4;
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const gl = document.querySelector("#c").getContext("webgl");
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const programInfo = twgl.createProgramInfo(gl, ["vs", "fs"]);
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const bufferInfo = twgl.primitives.createPlaneBufferInfo(gl, 1, 1, 1, 1, m4.rotationX(Math.PI * 0.5));
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function rand(min, max) {
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return min + Math.random() * (max - min);
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}
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// Shared values
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const camera = m4.identity();
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const view = m4.identity();
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const viewProjection = m4.identity();
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const world = m4.identity();
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const ctx = document.createElement("canvas").getContext("2d");
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function makeText(text) {
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ctx.font = "20px monospace";
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const t = ctx.measureText(text);
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ctx.canvas.width = Math.ceil(t.width) + 2;
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ctx.canvas.height = 24;
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ctx.font = "20px monospace";
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ctx.fillStyle = "white";
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ctx.textAlign = "center";
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ctx.textBaseAlign = "middle";
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ctx.fillText(text, ctx.canvas.width / 2 | 0, ctx.canvas.height / 2 | 0);
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return ctx.canvas;
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}
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const msgs = [
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"al",
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"joe",
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"jill",
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"brian",
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"thomas",
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"chrissy",
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"jennifer",
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"alexander",
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];
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gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, true);
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const textTextures = msgs.map(function(msg) {
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const canvas = makeText(msg);
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const scale = 0.01;
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return {
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tex: twgl.createTexture(gl, { src: canvas }),
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scale: [canvas.width * scale, canvas.height * scale, 1],
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};
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});
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const objects = [];
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const drawObjects = [];
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const numObjects = 500;
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const baseHue = rand(0, 360);
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for (let ii = 0; ii < numObjects; ++ii) {
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const texNdx = rand(0, textTextures.length) | 0;
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const text = textTextures[texNdx];
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const uniforms = {
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u_texture: text.tex,
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u_worldViewProjection: m4.identity(),
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u_color: chroma.hsv((baseHue + rand(0, 60)) % 360, 1, 1).gl(),
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};
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drawObjects.push({
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programInfo: programInfo,
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bufferInfo: bufferInfo,
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uniforms: uniforms,
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});
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objects.push({
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translation: [rand(-10, 10), rand(-10, 10), rand(-10, 10)],
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ySpeed: rand(0.1, 0.3),
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zSpeed: rand(0.1, 0.3),
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uniforms: uniforms,
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texInfo: text,
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});
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}
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const clearColor = chroma.hsv((baseHue + 30) % 360, 0.5, 0.5).gl();
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function render(time) {
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time *= 0.001;
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twgl.resizeCanvasToDisplaySize(gl.canvas);
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gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
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gl.enable(gl.DEPTH_TEST);
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gl.enable(gl.BLEND);
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gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
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gl.clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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const projection = m4.perspective(30 * Math.PI / 180, gl.canvas.clientWidth / gl.canvas.clientHeight, 0.5, 100);
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const eye = [1, 4, -20];
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const target = [0, 0, 0];
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const up = [0, 1, 0];
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m4.lookAt(eye, target, up, camera);
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m4.inverse(camera, view);
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m4.multiply(projection, view, viewProjection);
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objects.forEach(function(obj) {
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const uni = obj.uniforms;
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const texInfo = obj.texInfo;
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m4.identity(world);
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m4.rotateY(world, time * obj.ySpeed, world);
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m4.rotateZ(world, time * obj.zSpeed, world);
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m4.translate(world, obj.translation, world);
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m4.rotateX(world, time, world);
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m4.scale(world, texInfo.scale, world);
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m4.multiply(view, world, world);
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m4.multiply(projection, world, uni.u_worldViewProjection);
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});
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twgl.drawObjectList(gl, drawObjects);
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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</script>
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</html>
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