mirror of
https://github.com/greggman/twgl.js.git
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383 lines
11 KiB
HTML
383 lines
11 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 - textures" />
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<meta property="og:type" content="website" />
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<meta property="og:image" content="http://twgljs.org/examples/screenshots/textures.png" />
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<meta property="og:description" content="TWGL.js - textures" />
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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 - textures">
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<meta name="twitter:url" content="http://twgljs.org/examples/textures.html">
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<meta name="twitter:description" content="TWGL.js - textures">
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<meta name="twitter:image:src" content="http://twgljs.org/examples/screenshots/textures.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 - textures</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> - textures</div>
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</body>
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<script id="one-point-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 vec4 v_position;
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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="one-point-fs" type="notjs">
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precision mediump float;
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varying vec4 v_position;
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varying vec2 v_texCoord;
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uniform vec4 u_diffuseMult;
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uniform sampler2D u_diffuse;
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void main() {
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vec4 diffuseColor = texture2D(u_diffuse, v_texCoord) * u_diffuseMult;
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if (diffuseColor.a < 0.1) {
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discard;
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}
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gl_FragColor = diffuseColor;
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}
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</script>
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<script id="env-map-vs" type="notjs">
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uniform mat4 u_viewInverse;
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uniform mat4 u_world;
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uniform mat4 u_worldViewProjection;
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uniform mat4 u_worldInverseTranspose;
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attribute vec4 a_position;
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attribute vec3 a_normal;
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varying vec3 v_normal;
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varying vec3 v_surfaceToView;
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void main() {
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v_normal = (u_worldInverseTranspose * vec4(a_normal, 0)).xyz;
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v_surfaceToView = (u_viewInverse[3] - (u_world * a_position)).xyz;
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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="env-map-fs" type="notjs">
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precision mediump float;
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uniform samplerCube u_texture;
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varying vec3 v_surfaceToView;
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varying vec3 v_normal;
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void main() {
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vec3 normal = normalize(v_normal);
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vec3 surfaceToView = normalize(v_surfaceToView);
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vec4 color = textureCube(u_texture, -reflect(surfaceToView, normal));
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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 onePointProgramInfo = twgl.createProgramInfo(gl, ["one-point-vs", "one-point-fs"]);
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const envMapProgramInfo = twgl.createProgramInfo(gl, ["env-map-vs", "env-map-fs"]);
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const shapes = [
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twgl.primitives.createCubeBufferInfo(gl, 2),
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twgl.primitives.createSphereBufferInfo(gl, 1, 24, 12),
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twgl.primitives.createPlaneBufferInfo(gl, 2, 2),
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twgl.primitives.createTruncatedConeBufferInfo(gl, 1, 0, 2, 24, 1),
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];
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function rand(min, max) {
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if (max === undefined) {
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max = min;
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min = 0;
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}
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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 baseHue = rand(360);
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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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// A circle on a canvas
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const ctx = document.createElement("canvas").getContext("2d");
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ctx.canvas.width = 64;
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ctx.canvas.height = 64;
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function updateCanvas(time) {
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ctx.fillStyle = "#00f";
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ctx.strokeStyle = "#ff0";
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ctx.lineWidth = "10";
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ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
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ctx.beginPath();
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ctx.arc(ctx.canvas.width / 2, ctx.canvas.height / 2, ctx.canvas.width / 2.2 * Math.abs(Math.cos(time)), 0, Math.PI * 2);
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ctx.stroke();
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}
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updateCanvas(0);
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// A cubemap drawn to a canvas with a circle on each face.
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const cubemapCtx = document.createElement("canvas").getContext("2d");
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const size = 40;
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cubemapCtx.canvas.width = size * 6;
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cubemapCtx.canvas.height = size;
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cubemapCtx.fillStyle = "#888";
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for (let ff = 0; ff < 6; ++ff) {
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const color = chroma.hsv((baseHue + ff * 10) % 360, 1 - ff / 6, 1);
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cubemapCtx.fillStyle = color.darken().hex();
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cubemapCtx.fillRect(size * ff, 0, size, size);
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cubemapCtx.save();
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cubemapCtx.translate(size * (ff + 0.5), size * 0.5);
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cubemapCtx.beginPath();
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cubemapCtx.arc(0, 0, size * 0.3, 0, Math.PI * 2);
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cubemapCtx.fillStyle = color.hex();
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cubemapCtx.fill();
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cubemapCtx.restore();
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}
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// make 6 canvases to show loading from 6 element
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const cubeFaceCanvases = [];
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for (let ff = 0; ff < 6; ++ff) {
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const canvas = document.createElement("canvas");
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canvas.width = 128;
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canvas.height = 128;
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const ctx = canvas.getContext("2d");
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const color = chroma.hsv((baseHue + ff * 10) % 360, 1 - ff / 6, 1);
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ctx.fillStyle = color.darken().hex();
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ctx.fillRect(0, 0, 128, 128);
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ctx.translate(64, 64);
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ctx.rotate(Math.PI * .25);
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ctx.fillStyle = color.hex();
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ctx.fillRect(-40, -40, 80, 80);
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cubeFaceCanvases.push(canvas);
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}
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const textures = twgl.createTextures(gl, {
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// a power of 2 image
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hftIcon: { src: "images/hft-icon-16.png", mag: gl.NEAREST },
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// a non-power of 2 image
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clover: { src: "images/clover.jpg" },
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// From a canvas
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fromCanvas: { src: ctx.canvas },
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// A cubemap from 6 images
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yokohama: {
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target: gl.TEXTURE_CUBE_MAP,
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src: [
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'images/yokohama/posx.jpg',
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'images/yokohama/negx.jpg',
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'images/yokohama/posy.jpg',
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'images/yokohama/negy.jpg',
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'images/yokohama/posz.jpg',
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'images/yokohama/negz.jpg',
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],
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},
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// A cubemap from 1 image (can be 1x6, 2x3, 3x2, 6x1)
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goldengate: {
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target: gl.TEXTURE_CUBE_MAP,
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src: 'images/goldengate.jpg',
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},
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// A 2x2 pixel texture from a JavaScript array
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checker: {
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mag: gl.NEAREST,
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min: gl.LINEAR,
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src: [
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255, 255, 255, 255,
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192, 192, 192, 255,
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192, 192, 192, 255,
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255, 255, 255, 255,
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],
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},
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// a 1x8 pixel texture from a typed array.
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stripe: {
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mag: gl.NEAREST,
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min: gl.LINEAR,
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format: gl.LUMINANCE,
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src: new Uint8Array([
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255,
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128,
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255,
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128,
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255,
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128,
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255,
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128,
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]),
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width: 1,
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},
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// a cubemap from array
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cubemapFromArray: {
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target: gl.TEXTURE_CUBE_MAP,
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format: gl.RGBA,
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src: [
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0xF0, 0x80, 0x80, 0xFF,
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0x80, 0xE0, 0x80, 0xFF,
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0x80, 0x80, 0xD0, 0xFF,
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0xC0, 0x80, 0x80, 0xFF,
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0x80, 0xB0, 0x80, 0xFF,
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0x80, 0x80, 0x00, 0xFF,
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],
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},
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cubemapFromCanvas: { target: gl.TEXTURE_CUBE_MAP, src: cubemapCtx.canvas },
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cubemapFrom6Canvases: { target: gl.TEXTURE_CUBE_MAP, src: cubeFaceCanvases },
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});
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// This is soley to make it easy to pick textures at random
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const twoDTextures = [
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textures.checker,
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textures.stripe,
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textures.hftIcon,
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textures.clover,
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textures.fromCanvas,
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];
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const cubeTextures = [
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textures.yokohama,
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textures.goldengate,
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textures.cubemapFromCanvas,
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textures.cubemapFrom6Canvases,
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textures.cubemapFromArray,
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];
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const objects = [];
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const drawObjects = [];
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const numObjects = 100;
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for (let ii = 0; ii < numObjects; ++ii) {
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let uniforms;
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let programInfo;
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let shape;
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const renderType = rand(0, 2) | 0;
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switch (renderType) {
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case 0: // checker
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shape = shapes[ii % shapes.length];
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programInfo = onePointProgramInfo;
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uniforms = {
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u_diffuseMult: chroma.hsv((baseHue + rand(0, 60)) % 360, 0.4, 0.8).gl(),
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u_diffuse: twoDTextures[rand(0, twoDTextures.length) | 0],
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u_viewInverse: camera,
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u_world: m4.identity(),
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u_worldInverseTranspose: m4.identity(),
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u_worldViewProjection: m4.identity(),
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};
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break;
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case 1: // yokohama
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shape = rand(0, 2) < 1 ? shapes[1] : shapes[3];
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programInfo = envMapProgramInfo;
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uniforms = {
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u_texture: cubeTextures[rand(0, cubeTextures.length) | 0],
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u_viewInverse: camera,
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u_world: m4.identity(),
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u_worldInverseTranspose: m4.identity(),
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u_worldViewProjection: m4.identity(),
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};
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break;
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default:
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throw "wAT!";
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}
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drawObjects.push({
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programInfo: programInfo,
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bufferInfo: shape,
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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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});
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}
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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.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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const radius = 20;
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const orbitSpeed = time * 0.1;
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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 = [Math.cos(orbitSpeed) * radius, 4, Math.sin(orbitSpeed) * radius];
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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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updateCanvas(time);
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twgl.setTextureFromElement(gl, textures.fromCanvas, ctx.canvas);
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objects.forEach(function(obj) {
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const uni = obj.uniforms;
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const world = uni.u_world;
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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.transpose(m4.inverse(world, uni.u_worldInverseTranspose), uni.u_worldInverseTranspose);
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m4.multiply(viewProjection, uni.u_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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