webgl / webgl_tutorials · Commits

Commit 890d27961937e600a014cf4e73d4fa2fb9a971e3

Authored by Georg Hopp
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initial checkin

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  1 +toji*
  2 +Programming*
  1 +<html>
  2 + <head>
  3 + <title>First very simple WebGL example...</title>
  4 +
  5 + <script src="./gl-matrix-min.js" type="text/javascript"></script>
  6 +
  7 + <script type="text/javascript">
  8 + var projectionMatrix, modelViewMatrix;
  9 + var rotationAxis;
  10 + var shaderProgram, shaderVertexPositionAttribute
  11 + var shaderVertexColorAttribute;
  12 + var shaderProjectionMatrixUniform, shaderModelViewMatrixUniform;
  13 +
  14 + var duration = 5000; // ms
  15 + var currentTime = Date.now();
  16 +
  17 + function initWebGL(canvas) {
  18 + var gl = null;
  19 + var msg = "Your browser does not support WebGL, " +
  20 + "or it is not enabled by default.";
  21 + try {
  22 + gl = canvas.getContext("experimental-webgl");
  23 + }
  24 + catch (e) {
  25 + msg = "Error creating WebGL Context!: " + e.toString();
  26 + }
  27 + if (!gl) {
  28 + alert(msg);
  29 + throw new Error(msg);
  30 + }
  31 +
  32 + return gl;
  33 + }
  34 +
  35 + function initViewport(gl, canvas) {
  36 + gl.viewport(0, 0, canvas.width, canvas.height);
  37 + }
  38 +
  39 + // Create the vertex, color, and index data for a
  40 + // multicolored cube
  41 + function createCube(gl) {
  42 + // Vertex Data
  43 + var vertexBuffer;
  44 + vertexBuffer = gl.createBuffer();
  45 + gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
  46 + var verts = [
  47 + // Front face
  48 + -1.0, -1.0, 1.0,
  49 + 1.0, -1.0, 1.0,
  50 + 1.0, 1.0, 1.0,
  51 + -1.0, 1.0, 1.0,
  52 + // Back face
  53 + -1.0, -1.0, -1.0,
  54 + -1.0, 1.0, -1.0,
  55 + 1.0, 1.0, -1.0,
  56 + 1.0, -1.0, -1.0,
  57 + // Top face
  58 + -1.0, 1.0, -1.0,
  59 + -1.0, 1.0, 1.0,
  60 + 1.0, 1.0, 1.0,
  61 + 1.0, 1.0, -1.0,
  62 + // Bottom face
  63 + -1.0, -1.0, -1.0,
  64 + 1.0, -1.0, -1.0,
  65 + 1.0, -1.0, 1.0,
  66 + -1.0, -1.0, 1.0,
  67 + // Right face
  68 + 1.0, -1.0, -1.0,
  69 + 1.0, 1.0, -1.0,
  70 + 1.0, 1.0, 1.0,
  71 + 1.0, -1.0, 1.0,
  72 + // Left face
  73 + -1.0, -1.0, -1.0,
  74 + -1.0, -1.0, 1.0,
  75 + -1.0, 1.0, 1.0,
  76 + -1.0, 1.0, -1.0
  77 + ];
  78 + gl.bufferData(
  79 + gl.ARRAY_BUFFER,
  80 + new Float32Array(verts),
  81 + gl.STATIC_DRAW);
  82 + // Color data
  83 + var colorBuffer = gl.createBuffer();
  84 + gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
  85 + var faceColors = [
  86 + [1.0, 0.0, 0.0, 1.0], // Front face
  87 + [0.0, 1.0, 0.0, 1.0], // Back face
  88 + [0.0, 0.0, 1.0, 1.0], // Top face
  89 + [1.0, 1.0, 0.0, 1.0], // Bottom face
  90 + [1.0, 0.0, 1.0, 1.0], // Right face
  91 + [0.0, 1.0, 1.0, 1.0] // Left face
  92 + ];
  93 + var vertexColors = [];
  94 + for (var i in faceColors) {
  95 + var color = faceColors[i];
  96 + for (var j=0; j < 4; j++) {
  97 + vertexColors = vertexColors.concat(color);
  98 + }
  99 + }
  100 + gl.bufferData(
  101 + gl.ARRAY_BUFFER,
  102 + new Float32Array(vertexColors),
  103 + gl.STATIC_DRAW);
  104 + // Index data (defines the triangles to be drawn)
  105 + var cubeIndexBuffer = gl.createBuffer();
  106 + gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndexBuffer);
  107 + var cubeIndices = [
  108 + 0, 1, 2, 0, 2, 3, // Front face
  109 + 4, 5, 6, 4, 6, 7, // Back face
  110 + 8, 9, 10, 8, 10, 11, // Top face
  111 + 12, 13, 14, 12, 14, 15, // Bottom face
  112 + 16, 17, 18, 16, 18, 19, // Right face
  113 + 20, 21, 22, 20, 22, 23 // Left face
  114 + ];
  115 + gl.bufferData(
  116 + gl.ELEMENT_ARRAY_BUFFER,
  117 + new Uint16Array(cubeIndices),
  118 + gl.STATIC_DRAW);
  119 + var cube = {
  120 + buffer:vertexBuffer,
  121 + colorBuffer:colorBuffer,
  122 + indices:cubeIndexBuffer,
  123 + vertSize:3,
  124 + nVerts:24,
  125 + colorSize:4,
  126 + nColors: 24,
  127 + nIndices:36,
  128 + primtype:gl.TRIANGLES};
  129 +
  130 + return cube;
  131 + }
  132 +
  133 + function initMatrices(canvas) {
  134 + modelViewMatrix = mat4.create();
  135 + mat4.translate(
  136 + modelViewMatrix, modelViewMatrix, [0, 0, -8]);
  137 +
  138 + // Create a project matrix with 45 degree field of view
  139 + projectionMatrix = mat4.create();
  140 + mat4.perspective(projectionMatrix, Math.PI / 4,
  141 + canvas.width / canvas.height, 1, 10000);
  142 +
  143 + rotationAxis = vec3.create();
  144 + vec3.normalize(rotationAxis, [1, 1, 1]);
  145 + }
  146 +
  147 + function createShader(gl, id, type) {
  148 + var shader;
  149 + var str = document.getElementById(id).text;
  150 + if (type == "fragment") {
  151 + shader = gl.createShader(gl.FRAGMENT_SHADER);
  152 + } else if (type == "vertex") {
  153 + shader = gl.createShader(gl.VERTEX_SHADER);
  154 + } else {
  155 + return null;
  156 + }
  157 +
  158 + gl.shaderSource(shader, str);
  159 + gl.compileShader(shader);
  160 +
  161 + if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
  162 + alert(gl.getShaderInfoLog(shader));
  163 + return null;
  164 + }
  165 +
  166 + return shader;
  167 + }
  168 +
  169 + function initShader(gl, vertex, fragment) {
  170 + // load and compile the fragment and vertex shader
  171 + var fragmentShader = createShader(gl, fragment, "fragment");
  172 + var vertexShader = createShader(gl, vertex, "vertex");
  173 +
  174 + // link them together into a new program
  175 + shaderProgram = gl.createProgram();
  176 + gl.attachShader(shaderProgram, vertexShader);
  177 + gl.attachShader(shaderProgram, fragmentShader);
  178 + gl.linkProgram(shaderProgram);
  179 +
  180 + // get pointers to the shader params
  181 + shaderVertexPositionAttribute = gl.getAttribLocation(
  182 + shaderProgram, "vertexPos");
  183 + gl.enableVertexAttribArray(shaderVertexPositionAttribute);
  184 + shaderVertexColorAttribute = gl.getAttribLocation(
  185 + shaderProgram, "vertexColor");
  186 + gl.enableVertexAttribArray(shaderVertexColorAttribute);
  187 +
  188 + shaderProjectionMatrixUniform = gl.getUniformLocation(
  189 + shaderProgram, "projectionMatrix");
  190 + shaderModelViewMatrixUniform = gl.getUniformLocation(
  191 + shaderProgram, "modelViewMatrix");
  192 +
  193 + if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
  194 + alert("Could not initialise shaders");
  195 + }
  196 + }
  197 +
  198 + function draw(gl, obj) {
  199 + // clear the background (transparent)
  200 + gl.clearColor(0.0, 0.0, 0.0, 0.0);
  201 + // // clear the background (black)
  202 + // gl.clearColor(0.0, 0.0, 0.0, 1.0);
  203 + gl.enable(gl.DEPTH_TEST);
  204 + gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  205 +
  206 + // set the shader to use
  207 + gl.useProgram(shaderProgram);
  208 +
  209 + // connect up the shader parameters: vertex position,
  210 + // color, and projection/model matrices
  211 + // set up the buffers
  212 + gl.bindBuffer(gl.ARRAY_BUFFER, obj.buffer);
  213 + gl.vertexAttribPointer(shaderVertexPositionAttribute,
  214 + obj.vertSize, gl.FLOAT, false, 0, 0);
  215 + gl.bindBuffer(gl.ARRAY_BUFFER, obj.colorBuffer);
  216 + gl.vertexAttribPointer(shaderVertexColorAttribute,
  217 + obj.colorSize, gl.FLOAT, false, 0, 0);
  218 + gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, obj.indices);
  219 + gl.uniformMatrix4fv(shaderProjectionMatrixUniform, false,
  220 + projectionMatrix);
  221 + gl.uniformMatrix4fv(shaderModelViewMatrixUniform, false,
  222 + modelViewMatrix);
  223 +
  224 + // draw the object
  225 + gl.drawElements(
  226 + obj.primtype, obj.nIndices, gl.UNSIGNED_SHORT, 0);
  227 + }
  228 +
  229 + function animate() {
  230 + var now = Date.now();
  231 + var deltat = now - currentTime;
  232 + currentTime = now;
  233 + var fract = deltat / duration;
  234 + var angle = Math.PI * 2 * fract;
  235 + mat4.rotate(
  236 + modelViewMatrix, modelViewMatrix, angle, rotationAxis);
  237 + }
  238 +
  239 + function run(gl, cube) {
  240 + requestAnimationFrame(function() { run(gl, cube); });
  241 + draw(gl, cube);
  242 + animate();
  243 + }
  244 +
  245 + function startGl() {
  246 + // Get A WebGL context
  247 + var canvas = document.getElementById("cube");
  248 + var gl = initWebGL(canvas);
  249 + var obj = createCube(gl);
  250 +
  251 + initViewport(gl, canvas);
  252 + initMatrices(canvas);
  253 + initShader(
  254 + gl,
  255 + "cube-vertex-shader",
  256 + "cube-fragment-shader");
  257 + run(gl, obj);
  258 + }
  259 + </script>
  260 +
  261 + <script id="cube-vertex-shader" type="x-shader/x-vertex">
  262 + attribute vec3 vertexPos;
  263 + attribute vec4 vertexColor;
  264 + uniform mat4 modelViewMatrix;
  265 + uniform mat4 projectionMatrix;
  266 + varying vec4 vColor;
  267 + void main(void) {
  268 + // Return the transformed and projected vertex value
  269 + gl_Position =
  270 + projectionMatrix * modelViewMatrix * vec4(vertexPos, 1.0);
  271 + // Output the vertexColor in vColor
  272 + vColor = vertexColor;
  273 + }
  274 + </script>
  275 +
  276 + <script id="cube-fragment-shader" type="x-shader/x-fragment">
  277 + precision mediump float;
  278 + varying vec4 vColor;
  279 + void main(void) {
  280 + // Return the pixel color: always output white
  281 + gl_FragColor = vColor;
  282 + }
  283 + </script>
  284 + </head>
  285 +
  286 + <body onLoad="startGl()">
  287 + <canvas id="cube" width="200" height="200"></canvas>
  288 + </body>
  289 +</html>
  290 +<!-- vim: set ts=4 sw=4: -->
  1 +/**
  2 + * @fileoverview gl-matrix - High performance matrix and vector operations
  3 + * @author Brandon Jones
  4 + * @author Colin MacKenzie IV
  5 + * @version 2.3.2
  6 + */
  7 +
  8 +/* Copyright (c) 2015, Brandon Jones, Colin MacKenzie IV.
  9 +
  10 +Permission is hereby granted, free of charge, to any person obtaining a copy
  11 +of this software and associated documentation files (the "Software"), to deal
  12 +in the Software without restriction, including without limitation the rights
  13 +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 +copies of the Software, and to permit persons to whom the Software is
  15 +furnished to do so, subject to the following conditions:
  16 +
  17 +The above copyright notice and this permission notice shall be included in
  18 +all copies or substantial portions of the Software.
  19 +
  20 +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21 +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22 +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23 +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24 +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26 +THE SOFTWARE. */
  27 +
  28 +!function(t,a){if("object"==typeof exports&&"object"==typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var n=a();for(var r in n)("object"==typeof exports?exports:t)[r]=n[r]}}(this,function(){return function(t){function a(r){if(n[r])return n[r].exports;var o=n[r]={exports:{},id:r,loaded:!1};return t[r].call(o.exports,o,o.exports,a),o.loaded=!0,o.exports}var n={};return a.m=t,a.c=n,a.p="",a(0)}([function(t,a,n){a.glMatrix=n(1),a.mat2=n(2),a.mat2d=n(3),a.mat3=n(4),a.mat4=n(5),a.quat=n(6),a.vec2=n(9),a.vec3=n(7),a.vec4=n(8)},function(t,a){var n={};n.EPSILON=1e-6,n.ARRAY_TYPE="undefined"!=typeof Float32Array?Float32Array:Array,n.RANDOM=Math.random,n.ENABLE_SIMD=!1,n.SIMD_AVAILABLE=n.ARRAY_TYPE===Float32Array&&"SIMD"in this,n.USE_SIMD=n.ENABLE_SIMD&&n.SIMD_AVAILABLE,n.setMatrixArrayType=function(t){n.ARRAY_TYPE=t};var r=Math.PI/180;n.toRadian=function(t){return t*r},n.equals=function(t,a){return 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t[0]=a[0]+n[0],t[1]=a[1]+n[1],t[2]=a[2]+n[2],t[3]=a[3]+n[3],t[4]=a[4]+n[4],t[5]=a[5]+n[5],t},o.subtract=function(t,a,n){return t[0]=a[0]-n[0],t[1]=a[1]-n[1],t[2]=a[2]-n[2],t[3]=a[3]-n[3],t[4]=a[4]-n[4],t[5]=a[5]-n[5],t},o.sub=o.subtract,o.multiplyScalar=function(t,a,n){return t[0]=a[0]*n,t[1]=a[1]*n,t[2]=a[2]*n,t[3]=a[3]*n,t[4]=a[4]*n,t[5]=a[5]*n,t},o.multiplyScalarAndAdd=function(t,a,n,r){return t[0]=a[0]+n[0]*r,t[1]=a[1]+n[1]*r,t[2]=a[2]+n[2]*r,t[3]=a[3]+n[3]*r,t[4]=a[4]+n[4]*r,t[5]=a[5]+n[5]*r,t},o.exactEquals=function(t,a){return t[0]===a[0]&&t[1]===a[1]&&t[2]===a[2]&&t[3]===a[3]&&t[4]===a[4]&&t[5]===a[5]},o.equals=function(t,a){var n=t[0],o=t[1],u=t[2],l=t[3],e=t[4],M=t[5],s=a[0],i=a[1],c=a[2],h=a[3],S=a[4],I=a[5];return Math.abs(n-s)<=r.EPSILON*Math.max(1,Math.abs(n),Math.abs(s))&&Math.abs(o-i)<=r.EPSILON*Math.max(1,Math.abs(o),Math.abs(i))&&Math.abs(u-c)<=r.EPSILON*Math.max(1,Math.abs(u),Math.abs(c))&&Math.abs(l-h)<=r.EPSILON*Math.max(1,Math.abs(l),Math.abs(h))&&Math.abs(e-S)<=r.EPSILON*Math.max(1,Math.abs(e),Math.abs(S))&&Math.abs(M-I)<=r.EPSILON*Math.max(1,Math.abs(M),Math.abs(I))},t.exports=o},function(t,a,n){var r=n(1),o={};o.create=function(){var t=new r.ARRAY_TYPE(9);return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=1,t[5]=0,t[6]=0,t[7]=0,t[8]=1,t},o.fromMat4=function(t,a){return t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[4],t[4]=a[5],t[5]=a[6],t[6]=a[8],t[7]=a[9],t[8]=a[10],t},o.clone=function(t){var a=new r.ARRAY_TYPE(9);return a[0]=t[0],a[1]=t[1],a[2]=t[2],a[3]=t[3],a[4]=t[4],a[5]=t[5],a[6]=t[6],a[7]=t[7],a[8]=t[8],a},o.copy=function(t,a){return t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[3],t[4]=a[4],t[5]=a[5],t[6]=a[6],t[7]=a[7],t[8]=a[8],t},o.fromValues=function(t,a,n,o,u,l,e,M,s){var i=new r.ARRAY_TYPE(9);return i[0]=t,i[1]=a,i[2]=n,i[3]=o,i[4]=u,i[5]=l,i[6]=e,i[7]=M,i[8]=s,i},o.set=function(t,a,n,r,o,u,l,e,M,s){return t[0]=a,t[1]=n,t[2]=r,t[3]=o,t[4]=u,t[5]=l,t[6]=e,t[7]=M,t[8]=s,t},o.identity=function(t){return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=1,t[5]=0,t[6]=0,t[7]=0,t[8]=1,t},o.transpose=function(t,a){if(t===a){var n=a[1],r=a[2],o=a[5];t[1]=a[3],t[2]=a[6],t[3]=n,t[5]=a[7],t[6]=r,t[7]=o}else t[0]=a[0],t[1]=a[3],t[2]=a[6],t[3]=a[1],t[4]=a[4],t[5]=a[7],t[6]=a[2],t[7]=a[5],t[8]=a[8];return t},o.invert=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=a[4],e=a[5],M=a[6],s=a[7],i=a[8],c=i*l-e*s,h=-i*u+e*M,S=s*u-l*M,I=n*c+r*h+o*S;return I?(I=1/I,t[0]=c*I,t[1]=(-i*r+o*s)*I,t[2]=(e*r-o*l)*I,t[3]=h*I,t[4]=(i*n-o*M)*I,t[5]=(-e*n+o*u)*I,t[6]=S*I,t[7]=(-s*n+r*M)*I,t[8]=(l*n-r*u)*I,t):null},o.adjoint=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=a[4],e=a[5],M=a[6],s=a[7],i=a[8];return t[0]=l*i-e*s,t[1]=o*s-r*i,t[2]=r*e-o*l,t[3]=e*M-u*i,t[4]=n*i-o*M,t[5]=o*u-n*e,t[6]=u*s-l*M,t[7]=r*M-n*s,t[8]=n*l-r*u,t},o.determinant=function(t){var a=t[0],n=t[1],r=t[2],o=t[3],u=t[4],l=t[5],e=t[6],M=t[7],s=t[8];return a*(s*u-l*M)+n*(-s*o+l*e)+r*(M*o-u*e)},o.multiply=function(t,a,n){var r=a[0],o=a[1],u=a[2],l=a[3],e=a[4],M=a[5],s=a[6],i=a[7],c=a[8],h=n[0],S=n[1],I=n[2],f=n[3],x=n[4],D=n[5],F=n[6],m=n[7],d=n[8];return t[0]=h*r+S*l+I*s,t[1]=h*o+S*e+I*i,t[2]=h*u+S*M+I*c,t[3]=f*r+x*l+D*s,t[4]=f*o+x*e+D*i,t[5]=f*u+x*M+D*c,t[6]=F*r+m*l+d*s,t[7]=F*o+m*e+d*i,t[8]=F*u+m*M+d*c,t},o.mul=o.multiply,o.translate=function(t,a,n){var r=a[0],o=a[1],u=a[2],l=a[3],e=a[4],M=a[5],s=a[6],i=a[7],c=a[8],h=n[0],S=n[1];return t[0]=r,t[1]=o,t[2]=u,t[3]=l,t[4]=e,t[5]=M,t[6]=h*r+S*l+s,t[7]=h*o+S*e+i,t[8]=h*u+S*M+c,t},o.rotate=function(t,a,n){var r=a[0],o=a[1],u=a[2],l=a[3],e=a[4],M=a[5],s=a[6],i=a[7],c=a[8],h=Math.sin(n),S=Math.cos(n);return t[0]=S*r+h*l,t[1]=S*o+h*e,t[2]=S*u+h*M,t[3]=S*l-h*r,t[4]=S*e-h*o,t[5]=S*M-h*u,t[6]=s,t[7]=i,t[8]=c,t},o.scale=function(t,a,n){var r=n[0],o=n[1];return t[0]=r*a[0],t[1]=r*a[1],t[2]=r*a[2],t[3]=o*a[3],t[4]=o*a[4],t[5]=o*a[5],t[6]=a[6],t[7]=a[7],t[8]=a[8],t},o.fromTranslation=function(t,a){return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=1,t[5]=0,t[6]=a[0],t[7]=a[1],t[8]=1,t},o.fromRotation=function(t,a){var n=Math.sin(a),r=Math.cos(a);return t[0]=r,t[1]=n,t[2]=0,t[3]=-n,t[4]=r,t[5]=0,t[6]=0,t[7]=0,t[8]=1,t},o.fromScaling=function(t,a){return t[0]=a[0],t[1]=0,t[2]=0,t[3]=0,t[4]=a[1],t[5]=0,t[6]=0,t[7]=0,t[8]=1,t},o.fromMat2d=function(t,a){return t[0]=a[0],t[1]=a[1],t[2]=0,t[3]=a[2],t[4]=a[3],t[5]=0,t[6]=a[4],t[7]=a[5],t[8]=1,t},o.fromQuat=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=n+n,e=r+r,M=o+o,s=n*l,i=r*l,c=r*e,h=o*l,S=o*e,I=o*M,f=u*l,x=u*e,D=u*M;return t[0]=1-c-I,t[3]=i-D,t[6]=h+x,t[1]=i+D,t[4]=1-s-I,t[7]=S-f,t[2]=h-x,t[5]=S+f,t[8]=1-s-c,t},o.normalFromMat4=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=a[4],e=a[5],M=a[6],s=a[7],i=a[8],c=a[9],h=a[10],S=a[11],I=a[12],f=a[13],x=a[14],D=a[15],F=n*e-r*l,m=n*M-o*l,d=n*s-u*l,b=r*M-o*e,v=r*s-u*e,z=o*s-u*M,p=i*f-c*I,w=i*x-h*I,E=i*D-S*I,A=c*x-h*f,P=c*D-S*f,L=h*D-S*x,q=F*L-m*P+d*A+b*E-v*w+z*p;return q?(q=1/q,t[0]=(e*L-M*P+s*A)*q,t[1]=(M*E-l*L-s*w)*q,t[2]=(l*P-e*E+s*p)*q,t[3]=(o*P-r*L-u*A)*q,t[4]=(n*L-o*E+u*w)*q,t[5]=(r*E-n*P-u*p)*q,t[6]=(f*z-x*v+D*b)*q,t[7]=(x*d-I*z-D*m)*q,t[8]=(I*v-f*d+D*F)*q,t):null},o.str=function(t){return"mat3("+t[0]+", "+t[1]+", "+t[2]+", "+t[3]+", "+t[4]+", "+t[5]+", "+t[6]+", "+t[7]+", "+t[8]+")"},o.frob=function(t){return Math.sqrt(Math.pow(t[0],2)+Math.pow(t[1],2)+Math.pow(t[2],2)+Math.pow(t[3],2)+Math.pow(t[4],2)+Math.pow(t[5],2)+Math.pow(t[6],2)+Math.pow(t[7],2)+Math.pow(t[8],2))},o.add=function(t,a,n){return t[0]=a[0]+n[0],t[1]=a[1]+n[1],t[2]=a[2]+n[2],t[3]=a[3]+n[3],t[4]=a[4]+n[4],t[5]=a[5]+n[5],t[6]=a[6]+n[6],t[7]=a[7]+n[7],t[8]=a[8]+n[8],t},o.subtract=function(t,a,n){return t[0]=a[0]-n[0],t[1]=a[1]-n[1],t[2]=a[2]-n[2],t[3]=a[3]-n[3],t[4]=a[4]-n[4],t[5]=a[5]-n[5],t[6]=a[6]-n[6],t[7]=a[7]-n[7],t[8]=a[8]-n[8],t},o.sub=o.subtract,o.multiplyScalar=function(t,a,n){return t[0]=a[0]*n,t[1]=a[1]*n,t[2]=a[2]*n,t[3]=a[3]*n,t[4]=a[4]*n,t[5]=a[5]*n,t[6]=a[6]*n,t[7]=a[7]*n,t[8]=a[8]*n,t},o.multiplyScalarAndAdd=function(t,a,n,r){return t[0]=a[0]+n[0]*r,t[1]=a[1]+n[1]*r,t[2]=a[2]+n[2]*r,t[3]=a[3]+n[3]*r,t[4]=a[4]+n[4]*r,t[5]=a[5]+n[5]*r,t[6]=a[6]+n[6]*r,t[7]=a[7]+n[7]*r,t[8]=a[8]+n[8]*r,t},o.exactEquals=function(t,a){return t[0]===a[0]&&t[1]===a[1]&&t[2]===a[2]&&t[3]===a[3]&&t[4]===a[4]&&t[5]===a[5]&&t[6]===a[6]&&t[7]===a[7]&&t[8]===a[8]},o.equals=function(t,a){var n=t[0],o=t[1],u=t[2],l=t[3],e=t[4],M=t[5],s=t[6],i=t[7],c=t[8],h=a[0],S=a[1],I=a[2],f=a[3],x=a[4],D=a[5],F=t[6],m=a[7],d=a[8];return Math.abs(n-h)<=r.EPSILON*Math.max(1,Math.abs(n),Math.abs(h))&&Math.abs(o-S)<=r.EPSILON*Math.max(1,Math.abs(o),Math.abs(S))&&Math.abs(u-I)<=r.EPSILON*Math.max(1,Math.abs(u),Math.abs(I))&&Math.abs(l-f)<=r.EPSILON*Math.max(1,Math.abs(l),Math.abs(f))&&Math.abs(e-x)<=r.EPSILON*Math.max(1,Math.abs(e),Math.abs(x))&&Math.abs(M-D)<=r.EPSILON*Math.max(1,Math.abs(M),Math.abs(D))&&Math.abs(s-F)<=r.EPSILON*Math.max(1,Math.abs(s),Math.abs(F))&&Math.abs(i-m)<=r.EPSILON*Math.max(1,Math.abs(i),Math.abs(m))&&Math.abs(c-d)<=r.EPSILON*Math.max(1,Math.abs(c),Math.abs(d))},t.exports=o},function(t,a,n){var r=n(1),o={scalar:{},SIMD:{}};o.create=function(){var t=new r.ARRAY_TYPE(16);return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=1,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=1,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.clone=function(t){var a=new r.ARRAY_TYPE(16);return a[0]=t[0],a[1]=t[1],a[2]=t[2],a[3]=t[3],a[4]=t[4],a[5]=t[5],a[6]=t[6],a[7]=t[7],a[8]=t[8],a[9]=t[9],a[10]=t[10],a[11]=t[11],a[12]=t[12],a[13]=t[13],a[14]=t[14],a[15]=t[15],a},o.copy=function(t,a){return t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[3],t[4]=a[4],t[5]=a[5],t[6]=a[6],t[7]=a[7],t[8]=a[8],t[9]=a[9],t[10]=a[10],t[11]=a[11],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15],t},o.fromValues=function(t,a,n,o,u,l,e,M,s,i,c,h,S,I,f,x){var D=new r.ARRAY_TYPE(16);return D[0]=t,D[1]=a,D[2]=n,D[3]=o,D[4]=u,D[5]=l,D[6]=e,D[7]=M,D[8]=s,D[9]=i,D[10]=c,D[11]=h,D[12]=S,D[13]=I,D[14]=f,D[15]=x,D},o.set=function(t,a,n,r,o,u,l,e,M,s,i,c,h,S,I,f,x){return t[0]=a,t[1]=n,t[2]=r,t[3]=o,t[4]=u,t[5]=l,t[6]=e,t[7]=M,t[8]=s,t[9]=i,t[10]=c,t[11]=h,t[12]=S,t[13]=I,t[14]=f,t[15]=x,t},o.identity=function(t){return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=1,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=1,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.scalar.transpose=function(t,a){if(t===a){var n=a[1],r=a[2],o=a[3],u=a[6],l=a[7],e=a[11];t[1]=a[4],t[2]=a[8],t[3]=a[12],t[4]=n,t[6]=a[9],t[7]=a[13],t[8]=r,t[9]=u,t[11]=a[14],t[12]=o,t[13]=l,t[14]=e}else t[0]=a[0],t[1]=a[4],t[2]=a[8],t[3]=a[12],t[4]=a[1],t[5]=a[5],t[6]=a[9],t[7]=a[13],t[8]=a[2],t[9]=a[6],t[10]=a[10],t[11]=a[14],t[12]=a[3],t[13]=a[7],t[14]=a[11],t[15]=a[15];return t},o.SIMD.transpose=function(t,a){var n,r,o,u,l,e,M,s,i,c;return n=SIMD.Float32x4.load(a,0),r=SIMD.Float32x4.load(a,4),o=SIMD.Float32x4.load(a,8),u=SIMD.Float32x4.load(a,12),l=SIMD.Float32x4.shuffle(n,r,0,1,4,5),e=SIMD.Float32x4.shuffle(o,u,0,1,4,5),M=SIMD.Float32x4.shuffle(l,e,0,2,4,6),s=SIMD.Float32x4.shuffle(l,e,1,3,5,7),SIMD.Float32x4.store(t,0,M),SIMD.Float32x4.store(t,4,s),l=SIMD.Float32x4.shuffle(n,r,2,3,6,7),e=SIMD.Float32x4.shuffle(o,u,2,3,6,7),i=SIMD.Float32x4.shuffle(l,e,0,2,4,6),c=SIMD.Float32x4.shuffle(l,e,1,3,5,7),SIMD.Float32x4.store(t,8,i),SIMD.Float32x4.store(t,12,c),t},o.transpose=r.USE_SIMD?o.SIMD.transpose:o.scalar.transpose,o.scalar.invert=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=a[4],e=a[5],M=a[6],s=a[7],i=a[8],c=a[9],h=a[10],S=a[11],I=a[12],f=a[13],x=a[14],D=a[15],F=n*e-r*l,m=n*M-o*l,d=n*s-u*l,b=r*M-o*e,v=r*s-u*e,z=o*s-u*M,p=i*f-c*I,w=i*x-h*I,E=i*D-S*I,A=c*x-h*f,P=c*D-S*f,L=h*D-S*x,q=F*L-m*P+d*A+b*E-v*w+z*p;return q?(q=1/q,t[0]=(e*L-M*P+s*A)*q,t[1]=(o*P-r*L-u*A)*q,t[2]=(f*z-x*v+D*b)*q,t[3]=(h*v-c*z-S*b)*q,t[4]=(M*E-l*L-s*w)*q,t[5]=(n*L-o*E+u*w)*q,t[6]=(x*d-I*z-D*m)*q,t[7]=(i*z-h*d+S*m)*q,t[8]=(l*P-e*E+s*p)*q,t[9]=(r*E-n*P-u*p)*q,t[10]=(I*v-f*d+D*F)*q,t[11]=(c*d-i*v-S*F)*q,t[12]=(e*w-l*A-M*p)*q,t[13]=(n*A-r*w+o*p)*q,t[14]=(f*m-I*b-x*F)*q,t[15]=(i*b-c*m+h*F)*q,t):null},o.SIMD.invert=function(t,a){var n,r,o,u,l,e,M,s,i,c,h=SIMD.Float32x4.load(a,0),S=SIMD.Float32x4.load(a,4),I=SIMD.Float32x4.load(a,8),f=SIMD.Float32x4.load(a,12);return l=SIMD.Float32x4.shuffle(h,S,0,1,4,5),r=SIMD.Float32x4.shuffle(I,f,0,1,4,5),n=SIMD.Float32x4.shuffle(l,r,0,2,4,6),r=SIMD.Float32x4.shuffle(r,l,1,3,5,7),l=SIMD.Float32x4.shuffle(h,S,2,3,6,7),u=SIMD.Float32x4.shuffle(I,f,2,3,6,7),o=SIMD.Float32x4.shuffle(l,u,0,2,4,6),u=SIMD.Float32x4.shuffle(u,l,1,3,5,7),l=SIMD.Float32x4.mul(o,u),l=SIMD.Float32x4.swizzle(l,1,0,3,2),e=SIMD.Float32x4.mul(r,l),M=SIMD.Float32x4.mul(n,l),l=SIMD.Float32x4.swizzle(l,2,3,0,1),e=SIMD.Float32x4.sub(SIMD.Float32x4.mul(r,l),e),M=SIMD.Float32x4.sub(SIMD.Float32x4.mul(n,l),M),M=SIMD.Float32x4.swizzle(M,2,3,0,1),l=SIMD.Float32x4.mul(r,o),l=SIMD.Float32x4.swizzle(l,1,0,3,2),e=SIMD.Float32x4.add(SIMD.Float32x4.mul(u,l),e),i=SIMD.Float32x4.mul(n,l),l=SIMD.Float32x4.swizzle(l,2,3,0,1),e=SIMD.Float32x4.sub(e,SIMD.Float32x4.mul(u,l)),i=SIMD.Float32x4.sub(SIMD.Float32x4.mul(n,l),i),i=SIMD.Float32x4.swizzle(i,2,3,0,1),l=SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(r,2,3,0,1),u),l=SIMD.Float32x4.swizzle(l,1,0,3,2),o=SIMD.Float32x4.swizzle(o,2,3,0,1),e=SIMD.Float32x4.add(SIMD.Float32x4.mul(o,l),e),s=SIMD.Float32x4.mul(n,l),l=SIMD.Float32x4.swizzle(l,2,3,0,1),e=SIMD.Float32x4.sub(e,SIMD.Float32x4.mul(o,l)),s=SIMD.Float32x4.sub(SIMD.Float32x4.mul(n,l),s),s=SIMD.Float32x4.swizzle(s,2,3,0,1),l=SIMD.Float32x4.mul(n,r),l=SIMD.Float32x4.swizzle(l,1,0,3,2),s=SIMD.Float32x4.add(SIMD.Float32x4.mul(u,l),s),i=SIMD.Float32x4.sub(SIMD.Float32x4.mul(o,l),i),l=SIMD.Float32x4.swizzle(l,2,3,0,1),s=SIMD.Float32x4.sub(SIMD.Float32x4.mul(u,l),s),i=SIMD.Float32x4.sub(i,SIMD.Float32x4.mul(o,l)),l=SIMD.Float32x4.mul(n,u),l=SIMD.Float32x4.swizzle(l,1,0,3,2),M=SIMD.Float32x4.sub(M,SIMD.Float32x4.mul(o,l)),s=SIMD.Float32x4.add(SIMD.Float32x4.mul(r,l),s),l=SIMD.Float32x4.swizzle(l,2,3,0,1),M=SIMD.Float32x4.add(SIMD.Float32x4.mul(o,l),M),s=SIMD.Float32x4.sub(s,SIMD.Float32x4.mul(r,l)),l=SIMD.Float32x4.mul(n,o),l=SIMD.Float32x4.swizzle(l,1,0,3,2),M=SIMD.Float32x4.add(SIMD.Float32x4.mul(u,l),M),i=SIMD.Float32x4.sub(i,SIMD.Float32x4.mul(r,l)),l=SIMD.Float32x4.swizzle(l,2,3,0,1),M=SIMD.Float32x4.sub(M,SIMD.Float32x4.mul(u,l)),i=SIMD.Float32x4.add(SIMD.Float32x4.mul(r,l),i),c=SIMD.Float32x4.mul(n,e),c=SIMD.Float32x4.add(SIMD.Float32x4.swizzle(c,2,3,0,1),c),c=SIMD.Float32x4.add(SIMD.Float32x4.swizzle(c,1,0,3,2),c),l=SIMD.Float32x4.reciprocalApproximation(c),c=SIMD.Float32x4.sub(SIMD.Float32x4.add(l,l),SIMD.Float32x4.mul(c,SIMD.Float32x4.mul(l,l))),(c=SIMD.Float32x4.swizzle(c,0,0,0,0))?(SIMD.Float32x4.store(t,0,SIMD.Float32x4.mul(c,e)),SIMD.Float32x4.store(t,4,SIMD.Float32x4.mul(c,M)),SIMD.Float32x4.store(t,8,SIMD.Float32x4.mul(c,s)),SIMD.Float32x4.store(t,12,SIMD.Float32x4.mul(c,i)),t):null},o.invert=r.USE_SIMD?o.SIMD.invert:o.scalar.invert,o.scalar.adjoint=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=a[4],e=a[5],M=a[6],s=a[7],i=a[8],c=a[9],h=a[10],S=a[11],I=a[12],f=a[13],x=a[14],D=a[15];return t[0]=e*(h*D-S*x)-c*(M*D-s*x)+f*(M*S-s*h),t[1]=-(r*(h*D-S*x)-c*(o*D-u*x)+f*(o*S-u*h)),t[2]=r*(M*D-s*x)-e*(o*D-u*x)+f*(o*s-u*M),t[3]=-(r*(M*S-s*h)-e*(o*S-u*h)+c*(o*s-u*M)),t[4]=-(l*(h*D-S*x)-i*(M*D-s*x)+I*(M*S-s*h)),t[5]=n*(h*D-S*x)-i*(o*D-u*x)+I*(o*S-u*h),t[6]=-(n*(M*D-s*x)-l*(o*D-u*x)+I*(o*s-u*M)),t[7]=n*(M*S-s*h)-l*(o*S-u*h)+i*(o*s-u*M),t[8]=l*(c*D-S*f)-i*(e*D-s*f)+I*(e*S-s*c),t[9]=-(n*(c*D-S*f)-i*(r*D-u*f)+I*(r*S-u*c)),t[10]=n*(e*D-s*f)-l*(r*D-u*f)+I*(r*s-u*e),t[11]=-(n*(e*S-s*c)-l*(r*S-u*c)+i*(r*s-u*e)),t[12]=-(l*(c*x-h*f)-i*(e*x-M*f)+I*(e*h-M*c)),t[13]=n*(c*x-h*f)-i*(r*x-o*f)+I*(r*h-o*c),t[14]=-(n*(e*x-M*f)-l*(r*x-o*f)+I*(r*M-o*e)),t[15]=n*(e*h-M*c)-l*(r*h-o*c)+i*(r*M-o*e),t},o.SIMD.adjoint=function(t,a){var n,r,o,u,l,e,M,s,i,c,h,S,I,n=SIMD.Float32x4.load(a,0),r=SIMD.Float32x4.load(a,4),o=SIMD.Float32x4.load(a,8),u=SIMD.Float32x4.load(a,12);return i=SIMD.Float32x4.shuffle(n,r,0,1,4,5),e=SIMD.Float32x4.shuffle(o,u,0,1,4,5),l=SIMD.Float32x4.shuffle(i,e,0,2,4,6),e=SIMD.Float32x4.shuffle(e,i,1,3,5,7),i=SIMD.Float32x4.shuffle(n,r,2,3,6,7),s=SIMD.Float32x4.shuffle(o,u,2,3,6,7),M=SIMD.Float32x4.shuffle(i,s,0,2,4,6),s=SIMD.Float32x4.shuffle(s,i,1,3,5,7),i=SIMD.Float32x4.mul(M,s),i=SIMD.Float32x4.swizzle(i,1,0,3,2),c=SIMD.Float32x4.mul(e,i),h=SIMD.Float32x4.mul(l,i),i=SIMD.Float32x4.swizzle(i,2,3,0,1),c=SIMD.Float32x4.sub(SIMD.Float32x4.mul(e,i),c),h=SIMD.Float32x4.sub(SIMD.Float32x4.mul(l,i),h),h=SIMD.Float32x4.swizzle(h,2,3,0,1),i=SIMD.Float32x4.mul(e,M),i=SIMD.Float32x4.swizzle(i,1,0,3,2),c=SIMD.Float32x4.add(SIMD.Float32x4.mul(s,i),c),I=SIMD.Float32x4.mul(l,i),i=SIMD.Float32x4.swizzle(i,2,3,0,1),c=SIMD.Float32x4.sub(c,SIMD.Float32x4.mul(s,i)),I=SIMD.Float32x4.sub(SIMD.Float32x4.mul(l,i),I),I=SIMD.Float32x4.swizzle(I,2,3,0,1),i=SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(e,2,3,0,1),s),i=SIMD.Float32x4.swizzle(i,1,0,3,2),M=SIMD.Float32x4.swizzle(M,2,3,0,1),c=SIMD.Float32x4.add(SIMD.Float32x4.mul(M,i),c),S=SIMD.Float32x4.mul(l,i),i=SIMD.Float32x4.swizzle(i,2,3,0,1),c=SIMD.Float32x4.sub(c,SIMD.Float32x4.mul(M,i)),S=SIMD.Float32x4.sub(SIMD.Float32x4.mul(l,i),S),S=SIMD.Float32x4.swizzle(S,2,3,0,1),i=SIMD.Float32x4.mul(l,e),i=SIMD.Float32x4.swizzle(i,1,0,3,2),S=SIMD.Float32x4.add(SIMD.Float32x4.mul(s,i),S),I=SIMD.Float32x4.sub(SIMD.Float32x4.mul(M,i),I),i=SIMD.Float32x4.swizzle(i,2,3,0,1),S=SIMD.Float32x4.sub(SIMD.Float32x4.mul(s,i),S),I=SIMD.Float32x4.sub(I,SIMD.Float32x4.mul(M,i)),i=SIMD.Float32x4.mul(l,s),i=SIMD.Float32x4.swizzle(i,1,0,3,2),h=SIMD.Float32x4.sub(h,SIMD.Float32x4.mul(M,i)),S=SIMD.Float32x4.add(SIMD.Float32x4.mul(e,i),S),i=SIMD.Float32x4.swizzle(i,2,3,0,1),h=SIMD.Float32x4.add(SIMD.Float32x4.mul(M,i),h),S=SIMD.Float32x4.sub(S,SIMD.Float32x4.mul(e,i)),i=SIMD.Float32x4.mul(l,M),i=SIMD.Float32x4.swizzle(i,1,0,3,2),h=SIMD.Float32x4.add(SIMD.Float32x4.mul(s,i),h),I=SIMD.Float32x4.sub(I,SIMD.Float32x4.mul(e,i)),i=SIMD.Float32x4.swizzle(i,2,3,0,1),h=SIMD.Float32x4.sub(h,SIMD.Float32x4.mul(s,i)),I=SIMD.Float32x4.add(SIMD.Float32x4.mul(e,i),I),SIMD.Float32x4.store(t,0,c),SIMD.Float32x4.store(t,4,h),SIMD.Float32x4.store(t,8,S),SIMD.Float32x4.store(t,12,I),t},o.adjoint=r.USE_SIMD?o.SIMD.adjoint:o.scalar.adjoint,o.determinant=function(t){var a=t[0],n=t[1],r=t[2],o=t[3],u=t[4],l=t[5],e=t[6],M=t[7],s=t[8],i=t[9],c=t[10],h=t[11],S=t[12],I=t[13],f=t[14],x=t[15],D=a*l-n*u,F=a*e-r*u,m=a*M-o*u,d=n*e-r*l,b=n*M-o*l,v=r*M-o*e,z=s*I-i*S,p=s*f-c*S,w=s*x-h*S,E=i*f-c*I,A=i*x-h*I,P=c*x-h*f;return D*P-F*A+m*E+d*w-b*p+v*z},o.SIMD.multiply=function(t,a,n){var r=SIMD.Float32x4.load(a,0),o=SIMD.Float32x4.load(a,4),u=SIMD.Float32x4.load(a,8),l=SIMD.Float32x4.load(a,12),e=SIMD.Float32x4.load(n,0),M=SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(e,0,0,0,0),r),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(e,1,1,1,1),o),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(e,2,2,2,2),u),SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(e,3,3,3,3),l))));SIMD.Float32x4.store(t,0,M);var s=SIMD.Float32x4.load(n,4),i=SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(s,0,0,0,0),r),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(s,1,1,1,1),o),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(s,2,2,2,2),u),SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(s,3,3,3,3),l))));SIMD.Float32x4.store(t,4,i);var c=SIMD.Float32x4.load(n,8),h=SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(c,0,0,0,0),r),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(c,1,1,1,1),o),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(c,2,2,2,2),u),SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(c,3,3,3,3),l))));SIMD.Float32x4.store(t,8,h);var S=SIMD.Float32x4.load(n,12),I=SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(S,0,0,0,0),r),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(S,1,1,1,1),o),SIMD.Float32x4.add(SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(S,2,2,2,2),u),SIMD.Float32x4.mul(SIMD.Float32x4.swizzle(S,3,3,3,3),l))));return SIMD.Float32x4.store(t,12,I),t},o.scalar.multiply=function(t,a,n){var r=a[0],o=a[1],u=a[2],l=a[3],e=a[4],M=a[5],s=a[6],i=a[7],c=a[8],h=a[9],S=a[10],I=a[11],f=a[12],x=a[13],D=a[14],F=a[15],m=n[0],d=n[1],b=n[2],v=n[3];return t[0]=m*r+d*e+b*c+v*f,t[1]=m*o+d*M+b*h+v*x,t[2]=m*u+d*s+b*S+v*D,t[3]=m*l+d*i+b*I+v*F,m=n[4],d=n[5],b=n[6],v=n[7],t[4]=m*r+d*e+b*c+v*f,t[5]=m*o+d*M+b*h+v*x,t[6]=m*u+d*s+b*S+v*D,t[7]=m*l+d*i+b*I+v*F,m=n[8],d=n[9],b=n[10],v=n[11],t[8]=m*r+d*e+b*c+v*f,t[9]=m*o+d*M+b*h+v*x,t[10]=m*u+d*s+b*S+v*D,t[11]=m*l+d*i+b*I+v*F,m=n[12],d=n[13],b=n[14],v=n[15],t[12]=m*r+d*e+b*c+v*f,t[13]=m*o+d*M+b*h+v*x,t[14]=m*u+d*s+b*S+v*D,t[15]=m*l+d*i+b*I+v*F,t},o.multiply=r.USE_SIMD?o.SIMD.multiply:o.scalar.multiply,o.mul=o.multiply,o.scalar.translate=function(t,a,n){var r,o,u,l,e,M,s,i,c,h,S,I,f=n[0],x=n[1],D=n[2];return a===t?(t[12]=a[0]*f+a[4]*x+a[8]*D+a[12],t[13]=a[1]*f+a[5]*x+a[9]*D+a[13],t[14]=a[2]*f+a[6]*x+a[10]*D+a[14],t[15]=a[3]*f+a[7]*x+a[11]*D+a[15]):(r=a[0],o=a[1],u=a[2],l=a[3],e=a[4],M=a[5],s=a[6],i=a[7],c=a[8],h=a[9],S=a[10],I=a[11],t[0]=r,t[1]=o,t[2]=u,t[3]=l,t[4]=e,t[5]=M,t[6]=s,t[7]=i,t[8]=c,t[9]=h,t[10]=S,t[11]=I,t[12]=r*f+e*x+c*D+a[12],t[13]=o*f+M*x+h*D+a[13],t[14]=u*f+s*x+S*D+a[14],t[15]=l*f+i*x+I*D+a[15]),t},o.SIMD.translate=function(t,a,n){var r=SIMD.Float32x4.load(a,0),o=SIMD.Float32x4.load(a,4),u=SIMD.Float32x4.load(a,8),l=SIMD.Float32x4.load(a,12),e=SIMD.Float32x4(n[0],n[1],n[2],0);a!==t&&(t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[3],t[4]=a[4],t[5]=a[5],t[6]=a[6],t[7]=a[7],t[8]=a[8],t[9]=a[9],t[10]=a[10],t[11]=a[11]),r=SIMD.Float32x4.mul(r,SIMD.Float32x4.swizzle(e,0,0,0,0)),o=SIMD.Float32x4.mul(o,SIMD.Float32x4.swizzle(e,1,1,1,1)),u=SIMD.Float32x4.mul(u,SIMD.Float32x4.swizzle(e,2,2,2,2));var M=SIMD.Float32x4.add(r,SIMD.Float32x4.add(o,SIMD.Float32x4.add(u,l)));return SIMD.Float32x4.store(t,12,M),t},o.translate=r.USE_SIMD?o.SIMD.translate:o.scalar.translate,o.scalar.scale=function(t,a,n){var r=n[0],o=n[1],u=n[2];return t[0]=a[0]*r,t[1]=a[1]*r,t[2]=a[2]*r,t[3]=a[3]*r,t[4]=a[4]*o,t[5]=a[5]*o,t[6]=a[6]*o,t[7]=a[7]*o,t[8]=a[8]*u,t[9]=a[9]*u,t[10]=a[10]*u,t[11]=a[11]*u,t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15],t},o.SIMD.scale=function(t,a,n){var r,o,u,l=SIMD.Float32x4(n[0],n[1],n[2],0);return r=SIMD.Float32x4.load(a,0),SIMD.Float32x4.store(t,0,SIMD.Float32x4.mul(r,SIMD.Float32x4.swizzle(l,0,0,0,0))),o=SIMD.Float32x4.load(a,4),SIMD.Float32x4.store(t,4,SIMD.Float32x4.mul(o,SIMD.Float32x4.swizzle(l,1,1,1,1))),u=SIMD.Float32x4.load(a,8),SIMD.Float32x4.store(t,8,SIMD.Float32x4.mul(u,SIMD.Float32x4.swizzle(l,2,2,2,2))),t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15],t},o.scale=r.USE_SIMD?o.SIMD.scale:o.scalar.scale,o.rotate=function(t,a,n,o){var u,l,e,M,s,i,c,h,S,I,f,x,D,F,m,d,b,v,z,p,w,E,A,P,L=o[0],q=o[1],R=o[2],N=Math.sqrt(L*L+q*q+R*R);return Math.abs(N)<r.EPSILON?null:(N=1/N,L*=N,q*=N,R*=N,u=Math.sin(n),l=Math.cos(n),e=1-l,M=a[0],s=a[1],i=a[2],c=a[3],h=a[4],S=a[5],I=a[6],f=a[7],x=a[8],D=a[9],F=a[10],m=a[11],d=L*L*e+l,b=q*L*e+R*u,v=R*L*e-q*u,z=L*q*e-R*u,p=q*q*e+l,w=R*q*e+L*u,E=L*R*e+q*u,A=q*R*e-L*u,P=R*R*e+l,t[0]=M*d+h*b+x*v,t[1]=s*d+S*b+D*v,t[2]=i*d+I*b+F*v,t[3]=c*d+f*b+m*v,t[4]=M*z+h*p+x*w,t[5]=s*z+S*p+D*w,t[6]=i*z+I*p+F*w,t[7]=c*z+f*p+m*w,t[8]=M*E+h*A+x*P,t[9]=s*E+S*A+D*P,t[10]=i*E+I*A+F*P,t[11]=c*E+f*A+m*P,a!==t&&(t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]),t)},o.scalar.rotateX=function(t,a,n){var r=Math.sin(n),o=Math.cos(n),u=a[4],l=a[5],e=a[6],M=a[7],s=a[8],i=a[9],c=a[10],h=a[11];return a!==t&&(t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[3],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]),t[4]=u*o+s*r,t[5]=l*o+i*r,t[6]=e*o+c*r,t[7]=M*o+h*r,t[8]=s*o-u*r,t[9]=i*o-l*r,t[10]=c*o-e*r,t[11]=h*o-M*r,t},o.SIMD.rotateX=function(t,a,n){var r=SIMD.Float32x4.splat(Math.sin(n)),o=SIMD.Float32x4.splat(Math.cos(n));a!==t&&(t[0]=a[0],t[1]=a[1],t[2]=a[2],t[3]=a[3],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]);var u=SIMD.Float32x4.load(a,4),l=SIMD.Float32x4.load(a,8);return SIMD.Float32x4.store(t,4,SIMD.Float32x4.add(SIMD.Float32x4.mul(u,o),SIMD.Float32x4.mul(l,r))),SIMD.Float32x4.store(t,8,SIMD.Float32x4.sub(SIMD.Float32x4.mul(l,o),SIMD.Float32x4.mul(u,r))),t},o.rotateX=r.USE_SIMD?o.SIMD.rotateX:o.scalar.rotateX,o.scalar.rotateY=function(t,a,n){var r=Math.sin(n),o=Math.cos(n),u=a[0],l=a[1],e=a[2],M=a[3],s=a[8],i=a[9],c=a[10],h=a[11];return a!==t&&(t[4]=a[4],t[5]=a[5],t[6]=a[6],t[7]=a[7],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]),t[0]=u*o-s*r,t[1]=l*o-i*r,t[2]=e*o-c*r,t[3]=M*o-h*r,t[8]=u*r+s*o,t[9]=l*r+i*o,t[10]=e*r+c*o,t[11]=M*r+h*o,t},o.SIMD.rotateY=function(t,a,n){var r=SIMD.Float32x4.splat(Math.sin(n)),o=SIMD.Float32x4.splat(Math.cos(n));a!==t&&(t[4]=a[4],t[5]=a[5],t[6]=a[6],t[7]=a[7],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]);var u=SIMD.Float32x4.load(a,0),l=SIMD.Float32x4.load(a,8);return SIMD.Float32x4.store(t,0,SIMD.Float32x4.sub(SIMD.Float32x4.mul(u,o),SIMD.Float32x4.mul(l,r))),SIMD.Float32x4.store(t,8,SIMD.Float32x4.add(SIMD.Float32x4.mul(u,r),SIMD.Float32x4.mul(l,o))),t},o.rotateY=r.USE_SIMD?o.SIMD.rotateY:o.scalar.rotateY,o.scalar.rotateZ=function(t,a,n){var r=Math.sin(n),o=Math.cos(n),u=a[0],l=a[1],e=a[2],M=a[3],s=a[4],i=a[5],c=a[6],h=a[7];return a!==t&&(t[8]=a[8],t[9]=a[9],t[10]=a[10],t[11]=a[11],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]),t[0]=u*o+s*r,t[1]=l*o+i*r,t[2]=e*o+c*r,t[3]=M*o+h*r,t[4]=s*o-u*r,t[5]=i*o-l*r,t[6]=c*o-e*r,t[7]=h*o-M*r,t},o.SIMD.rotateZ=function(t,a,n){var r=SIMD.Float32x4.splat(Math.sin(n)),o=SIMD.Float32x4.splat(Math.cos(n));a!==t&&(t[8]=a[8],t[9]=a[9],t[10]=a[10],t[11]=a[11],t[12]=a[12],t[13]=a[13],t[14]=a[14],t[15]=a[15]);var u=SIMD.Float32x4.load(a,0),l=SIMD.Float32x4.load(a,4);return SIMD.Float32x4.store(t,0,SIMD.Float32x4.add(SIMD.Float32x4.mul(u,o),SIMD.Float32x4.mul(l,r))),SIMD.Float32x4.store(t,4,SIMD.Float32x4.sub(SIMD.Float32x4.mul(l,o),SIMD.Float32x4.mul(u,r))),t},o.rotateZ=r.USE_SIMD?o.SIMD.rotateZ:o.scalar.rotateZ,o.fromTranslation=function(t,a){return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=1,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=1,t[11]=0,t[12]=a[0],t[13]=a[1],t[14]=a[2],t[15]=1,t},o.fromScaling=function(t,a){return t[0]=a[0],t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=a[1],t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=a[2],t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.fromRotation=function(t,a,n){var o,u,l,e=n[0],M=n[1],s=n[2],i=Math.sqrt(e*e+M*M+s*s);return Math.abs(i)<r.EPSILON?null:(i=1/i,e*=i,M*=i,s*=i,o=Math.sin(a),u=Math.cos(a),l=1-u,t[0]=e*e*l+u,t[1]=M*e*l+s*o,t[2]=s*e*l-M*o,t[3]=0,t[4]=e*M*l-s*o,t[5]=M*M*l+u,t[6]=s*M*l+e*o,t[7]=0,t[8]=e*s*l+M*o,t[9]=M*s*l-e*o,t[10]=s*s*l+u,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t)},o.fromXRotation=function(t,a){var n=Math.sin(a),r=Math.cos(a);return t[0]=1,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=r,t[6]=n,t[7]=0,t[8]=0,t[9]=-n,t[10]=r,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.fromYRotation=function(t,a){var n=Math.sin(a),r=Math.cos(a);return t[0]=r,t[1]=0,t[2]=-n,t[3]=0,t[4]=0,t[5]=1,t[6]=0,t[7]=0,t[8]=n,t[9]=0,t[10]=r,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.fromZRotation=function(t,a){var n=Math.sin(a),r=Math.cos(a);return t[0]=r,t[1]=n,t[2]=0,t[3]=0,t[4]=-n,t[5]=r,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=1,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.fromRotationTranslation=function(t,a,n){var r=a[0],o=a[1],u=a[2],l=a[3],e=r+r,M=o+o,s=u+u,i=r*e,c=r*M,h=r*s,S=o*M,I=o*s,f=u*s,x=l*e,D=l*M,F=l*s;return t[0]=1-(S+f),t[1]=c+F,t[2]=h-D,t[3]=0,t[4]=c-F,t[5]=1-(i+f),t[6]=I+x,t[7]=0,t[8]=h+D,t[9]=I-x,t[10]=1-(i+S),t[11]=0,t[12]=n[0],t[13]=n[1],t[14]=n[2],t[15]=1,t},o.getTranslation=function(t,a){return t[0]=a[12],t[1]=a[13],t[2]=a[14],t},o.getRotation=function(t,a){var n=a[0]+a[5]+a[10],r=0;return n>0?(r=2*Math.sqrt(n+1),t[3]=.25*r,t[0]=(a[6]-a[9])/r,t[1]=(a[8]-a[2])/r,t[2]=(a[1]-a[4])/r):a[0]>a[5]&a[0]>a[10]?(r=2*Math.sqrt(1+a[0]-a[5]-a[10]),t[3]=(a[6]-a[9])/r,t[0]=.25*r,t[1]=(a[1]+a[4])/r,t[2]=(a[8]+a[2])/r):a[5]>a[10]?(r=2*Math.sqrt(1+a[5]-a[0]-a[10]),t[3]=(a[8]-a[2])/r,t[0]=(a[1]+a[4])/r,t[1]=.25*r,t[2]=(a[6]+a[9])/r):(r=2*Math.sqrt(1+a[10]-a[0]-a[5]),t[3]=(a[1]-a[4])/r,t[0]=(a[8]+a[2])/r,t[1]=(a[6]+a[9])/r,t[2]=.25*r),t},o.fromRotationTranslationScale=function(t,a,n,r){var o=a[0],u=a[1],l=a[2],e=a[3],M=o+o,s=u+u,i=l+l,c=o*M,h=o*s,S=o*i,I=u*s,f=u*i,x=l*i,D=e*M,F=e*s,m=e*i,d=r[0],b=r[1],v=r[2];return t[0]=(1-(I+x))*d,t[1]=(h+m)*d,t[2]=(S-F)*d,t[3]=0,t[4]=(h-m)*b,t[5]=(1-(c+x))*b,t[6]=(f+D)*b,t[7]=0,t[8]=(S+F)*v,t[9]=(f-D)*v,t[10]=(1-(c+I))*v,t[11]=0,t[12]=n[0],t[13]=n[1],t[14]=n[2],t[15]=1,t},o.fromRotationTranslationScaleOrigin=function(t,a,n,r,o){
  29 +var u=a[0],l=a[1],e=a[2],M=a[3],s=u+u,i=l+l,c=e+e,h=u*s,S=u*i,I=u*c,f=l*i,x=l*c,D=e*c,F=M*s,m=M*i,d=M*c,b=r[0],v=r[1],z=r[2],p=o[0],w=o[1],E=o[2];return t[0]=(1-(f+D))*b,t[1]=(S+d)*b,t[2]=(I-m)*b,t[3]=0,t[4]=(S-d)*v,t[5]=(1-(h+D))*v,t[6]=(x+F)*v,t[7]=0,t[8]=(I+m)*z,t[9]=(x-F)*z,t[10]=(1-(h+f))*z,t[11]=0,t[12]=n[0]+p-(t[0]*p+t[4]*w+t[8]*E),t[13]=n[1]+w-(t[1]*p+t[5]*w+t[9]*E),t[14]=n[2]+E-(t[2]*p+t[6]*w+t[10]*E),t[15]=1,t},o.fromQuat=function(t,a){var n=a[0],r=a[1],o=a[2],u=a[3],l=n+n,e=r+r,M=o+o,s=n*l,i=r*l,c=r*e,h=o*l,S=o*e,I=o*M,f=u*l,x=u*e,D=u*M;return t[0]=1-c-I,t[1]=i+D,t[2]=h-x,t[3]=0,t[4]=i-D,t[5]=1-s-I,t[6]=S+f,t[7]=0,t[8]=h+x,t[9]=S-f,t[10]=1-s-c,t[11]=0,t[12]=0,t[13]=0,t[14]=0,t[15]=1,t},o.frustum=function(t,a,n,r,o,u,l){var e=1/(n-a),M=1/(o-r),s=1/(u-l);return t[0]=2*u*e,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=2*u*M,t[6]=0,t[7]=0,t[8]=(n+a)*e,t[9]=(o+r)*M,t[10]=(l+u)*s,t[11]=-1,t[12]=0,t[13]=0,t[14]=l*u*2*s,t[15]=0,t},o.perspective=function(t,a,n,r,o){var u=1/Math.tan(a/2),l=1/(r-o);return t[0]=u/n,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=u,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=(o+r)*l,t[11]=-1,t[12]=0,t[13]=0,t[14]=2*o*r*l,t[15]=0,t},o.perspectiveFromFieldOfView=function(t,a,n,r){var o=Math.tan(a.upDegrees*Math.PI/180),u=Math.tan(a.downDegrees*Math.PI/180),l=Math.tan(a.leftDegrees*Math.PI/180),e=Math.tan(a.rightDegrees*Math.PI/180),M=2/(l+e),s=2/(o+u);return t[0]=M,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=s,t[6]=0,t[7]=0,t[8]=-((l-e)*M*.5),t[9]=(o-u)*s*.5,t[10]=r/(n-r),t[11]=-1,t[12]=0,t[13]=0,t[14]=r*n/(n-r),t[15]=0,t},o.ortho=function(t,a,n,r,o,u,l){var e=1/(a-n),M=1/(r-o),s=1/(u-l);return t[0]=-2*e,t[1]=0,t[2]=0,t[3]=0,t[4]=0,t[5]=-2*M,t[6]=0,t[7]=0,t[8]=0,t[9]=0,t[10]=2*s,t[11]=0,t[12]=(a+n)*e,t[13]=(o+r)*M,t[14]=(l+u)*s,t[15]=1,t},o.lookAt=function(t,a,n,u){var l,e,M,s,i,c,h,S,I,f,x=a[0],D=a[1],F=a[2],m=u[0],d=u[1],b=u[2],v=n[0],z=n[1],p=n[2];return Math.abs(x-v)<r.EPSILON&&Math.abs(D-z)<r.EPSILON&&Math.abs(F-p)<r.EPSILON?o.identity(t):(h=x-v,S=D-z,I=F-p,f=1/Math.sqrt(h*h+S*S+I*I),h*=f,S*=f,I*=f,l=d*I-b*S,e=b*h-m*I,M=m*S-d*h,f=Math.sqrt(l*l+e*e+M*M),f?(f=1/f,l*=f,e*=f,M*=f):(l=0,e=0,M=0),s=S*M-I*e,i=I*l-h*M,c=h*e-S*l,f=Math.sqrt(s*s+i*i+c*c),f?(f=1/f,s*=f,i*=f,c*=f):(s=0,i=0,c=0),t[0]=l,t[1]=s,t[2]=h,t[3]=0,t[4]=e,t[5]=i,t[6]=S,t[7]=0,t[8]=M,t[9]=c,t[10]=I,t[11]=0,t[12]=-(l*x+e*D+M*F),t[13]=-(s*x+i*D+c*F),t[14]=-(h*x+S*D+I*F),t[15]=1,t)},o.str=function(t){return"mat4("+t[0]+", "+t[1]+", "+t[2]+", "+t[3]+", "+t[4]+", "+t[5]+", "+t[6]+", "+t[7]+", "+t[8]+", "+t[9]+", "+t[10]+", "+t[11]+", "+t[12]+", "+t[13]+", "+t[14]+", "+t[15]+")"},o.frob=function(t){return 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n=t[0],o=t[1],u=t[2],l=t[3],e=t[4],M=t[5],s=t[6],i=t[7],c=t[8],h=t[9],S=t[10],I=t[11],f=t[12],x=t[13],D=t[14],F=t[15],m=a[0],d=a[1],b=a[2],v=a[3],z=a[4],p=a[5],w=a[6],E=a[7],A=a[8],P=a[9],L=a[10],q=a[11],R=a[12],N=a[13],O=a[14],Y=a[15];return 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r=n(1),o=n(4),u=n(7),l=n(8),e={};e.create=function(){var t=new r.ARRAY_TYPE(4);return t[0]=0,t[1]=0,t[2]=0,t[3]=1,t},e.rotationTo=function(){var t=u.create(),a=u.fromValues(1,0,0),n=u.fromValues(0,1,0);return function(r,o,l){var M=u.dot(o,l);return-.999999>M?(u.cross(t,a,o),u.length(t)<1e-6&&u.cross(t,n,o),u.normalize(t,t),e.setAxisAngle(r,t,Math.PI),r):M>.999999?(r[0]=0,r[1]=0,r[2]=0,r[3]=1,r):(u.cross(t,o,l),r[0]=t[0],r[1]=t[1],r[2]=t[2],r[3]=1+M,e.normalize(r,r))}}(),e.setAxes=function(){var t=o.create();return function(a,n,r,o){return t[0]=r[0],t[3]=r[1],t[6]=r[2],t[1]=o[0],t[4]=o[1],t[7]=o[2],t[2]=-n[0],t[5]=-n[1],t[8]=-n[2],e.normalize(a,e.fromMat3(a,t))}}(),e.clone=l.clone,e.fromValues=l.fromValues,e.copy=l.copy,e.set=l.set,e.identity=function(t){return t[0]=0,t[1]=0,t[2]=0,t[3]=1,t},e.setAxisAngle=function(t,a,n){n=.5*n;var r=Math.sin(n);return t[0]=r*a[0],t[1]=r*a[1],t[2]=r*a[2],t[3]=Math.cos(n),t},e.getAxisAngle=function(t,a){var n=2*Math.acos(a[3]),r=Math.sin(n/2);return 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  1 +<html>
  2 + <head>
  3 + <title> Oh my Gosh </title>
  4 + </head>
  5 +
  6 + <body>
  7 + <h1>Some WebGL tests</h1>
  8 + <hr>
  9 + <ul>
  10 + <li><a href="square.html">square</a></li>
  11 + <li><a href="cube.html">cube</a></li>
  12 + <li><a href="texture.html">texture</a></li>
  13 + </ul>
  14 + <hr>
  15 + </body>
  16 +</html>
  17 +<!-- vim: set ts=4 sw=4: -->
  1 +<html>
  2 + <head>
  3 + <title>First very simple WebGL example...</title>
  4 +
  5 + <script src="./gl-matrix-min.js" type="text/javascript"></script>
  6 +
  7 + <script type="text/javascript">
  8 + var projectionMatrix, modelViewMatrix;
  9 + var shaderProgram, shaderVertexPositionAttribute;
  10 + var shaderProjectionMatrixUniform, shaderModelViewMatrixUniform;
  11 +
  12 + function initWebGL(canvas) {
  13 + var gl = null;
  14 + var msg = "Your browser does not support WebGL, " +
  15 + "or it is not enabled by default.";
  16 + try {
  17 + gl = canvas.getContext("experimental-webgl");
  18 + }
  19 + catch (e) {
  20 + msg = "Error creating WebGL Context!: " + e.toString();
  21 + }
  22 + if (!gl) {
  23 + alert(msg);
  24 + throw new Error(msg);
  25 + }
  26 +
  27 + return gl;
  28 + }
  29 +
  30 + function initViewport(gl, canvas) {
  31 + gl.viewport(0, 0, canvas.width, canvas.height);
  32 + }
  33 +
  34 + // Create the vertex data for a square to be drawn
  35 + function createSquare(gl) {
  36 + var vertexBuffer;
  37 + vertexBuffer = gl.createBuffer();
  38 + gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
  39 + var verts = [
  40 + .5, .5, 0.0,
  41 + -.5, .5, 0.0,
  42 + .5, -.5, 0.0,
  43 + -.5, -.5, 0.0
  44 + ];
  45 + gl.bufferData(
  46 + gl.ARRAY_BUFFER,
  47 + new Float32Array(verts),
  48 + gl.STATIC_DRAW);
  49 + var square = {
  50 + buffer:vertexBuffer,
  51 + vertSize:3,
  52 + nVerts:4,
  53 + primtype:gl.TRIANGLE_STRIP};
  54 + return square;
  55 + }
  56 +
  57 + function initMatrices(canvas) {
  58 + // Create a model view matrix with camera at 0, 0, −3.333
  59 + modelViewMatrix = mat4.create();
  60 + mat4.translate(
  61 + modelViewMatrix, modelViewMatrix, [0, 0, -3.333]);
  62 +
  63 + // Create a project matrix with 45 degree field of view
  64 + projectionMatrix = mat4.create();
  65 + mat4.perspective(projectionMatrix, Math.PI / 4,
  66 + canvas.width / canvas.height, 1, 10000);
  67 + }
  68 +
  69 + function createShader(gl, id, type) {
  70 + var shader;
  71 + var str = document.getElementById(id).text;
  72 + if (type == "fragment") {
  73 + shader = gl.createShader(gl.FRAGMENT_SHADER);
  74 + } else if (type == "vertex") {
  75 + shader = gl.createShader(gl.VERTEX_SHADER);
  76 + } else {
  77 + return null;
  78 + }
  79 +
  80 + gl.shaderSource(shader, str);
  81 + gl.compileShader(shader);
  82 +
  83 + if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
  84 + alert(gl.getShaderInfoLog(shader));
  85 + return null;
  86 + }
  87 +
  88 + return shader;
  89 + }
  90 +
  91 + function initShader(gl, vertex, fragment) {
  92 + // load and compile the fragment and vertex shader
  93 + var fragmentShader = createShader(gl, fragment, "fragment");
  94 + var vertexShader = createShader(gl, vertex, "vertex");
  95 +
  96 + // link them together into a new program
  97 + shaderProgram = gl.createProgram();
  98 + gl.attachShader(shaderProgram, vertexShader);
  99 + gl.attachShader(shaderProgram, fragmentShader);
  100 + gl.linkProgram(shaderProgram);
  101 +
  102 + // get pointers to the shader params
  103 + shaderVertexPositionAttribute = gl.getAttribLocation(
  104 + shaderProgram, "vertexPos");
  105 + gl.enableVertexAttribArray(shaderVertexPositionAttribute);
  106 +
  107 + shaderProjectionMatrixUniform = gl.getUniformLocation(
  108 + shaderProgram, "projectionMatrix");
  109 + shaderModelViewMatrixUniform = gl.getUniformLocation(
  110 + shaderProgram, "modelViewMatrix");
  111 +
  112 + if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
  113 + alert("Could not initialise shaders");
  114 + }
  115 + }
  116 +
  117 + function draw(gl, obj) {
  118 + // clear the background (with black)
  119 + gl.clearColor(0.0, 0.0, 0.0, 1.0);
  120 + gl.clear(gl.COLOR_BUFFER_BIT);
  121 +
  122 + // set the vertex buffer to be drawn
  123 + gl.bindBuffer(gl.ARRAY_BUFFER, obj.buffer);
  124 +
  125 + // set the shader to use
  126 + gl.useProgram(shaderProgram);
  127 +
  128 + // connect up the shader parameters: vertex position and
  129 + // projection/model matrices
  130 + gl.vertexAttribPointer(
  131 + shaderVertexPositionAttribute,
  132 + obj.vertSize,
  133 + gl.FLOAT, false, 0, 0);
  134 + gl.uniformMatrix4fv(
  135 + shaderProjectionMatrixUniform,
  136 + false, projectionMatrix);
  137 + gl.uniformMatrix4fv(
  138 + shaderModelViewMatrixUniform, false, modelViewMatrix);
  139 +
  140 + // draw the object
  141 + gl.drawArrays(obj.primtype, 0, obj.nVerts);
  142 + }
  143 +
  144 + function startGl() {
  145 + // Get A WebGL context
  146 + var canvas = document.getElementById("square");
  147 + var gl = initWebGL(canvas);
  148 + var obj = createSquare(gl);
  149 +
  150 + initViewport(gl, canvas);
  151 + initMatrices(canvas);
  152 + initShader(
  153 + gl,
  154 + "square-vertex-shader",
  155 + "square-fragment-shader");
  156 + draw(gl, obj);
  157 + }
  158 + </script>
  159 +
  160 + <script id="square-vertex-shader" type="x-shader/x-vertex">
  161 + attribute vec3 vertexPos;
  162 + uniform mat4 modelViewMatrix;
  163 + uniform mat4 projectionMatrix;
  164 + void main(void) {
  165 + // Return the transformed and projected vertex value
  166 + gl_Position =
  167 + projectionMatrix * modelViewMatrix * vec4(vertexPos, 1.0);
  168 + }
  169 + </script>
  170 +
  171 + <script id="square-fragment-shader" type="x-shader/x-fragment">
  172 + void main(void) {
  173 + // Return the pixel color: always output white
  174 + gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
  175 + }
  176 + </script>
  177 + </head>
  178 +
  179 + <body onLoad="startGl()">
  180 + <canvas id="square" width="200" height="200"></canvas>
  181 + </body>
  182 +</html>
  183 +<!-- vim: set ts=4 sw=4: -->
  1 +<html>
  2 + <head>
  3 + <title>First very simple WebGL example...</title>
  4 +
  5 + <script src="./gl-matrix-min.js" type="text/javascript"></script>
  6 +
  7 + <script type="text/javascript">
  8 + var projectionMatrix, modelViewMatrix;
  9 + var rotationAxis;
  10 + var shaderProgram, shaderVertexPositionAttribute
  11 + var shaderTexCoordAttribute, shaderSamplerUniform;
  12 + var shaderProjectionMatrixUniform, shaderModelViewMatrixUniform;
  13 +
  14 + var duration = 5000; // ms
  15 + var currentTime = Date.now();
  16 +
  17 + var okToRun = false;
  18 + var webGLTexture;
  19 +
  20 + function handleTextureLoaded(gl, texture) {
  21 + gl.bindTexture(gl.TEXTURE_2D, texture);
  22 + gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
  23 + gl.texImage2D(
  24 + gl.TEXTURE_2D,
  25 + 0,
  26 + gl.RGBA,
  27 + gl.RGBA,
  28 + gl.UNSIGNED_BYTE,
  29 + texture.image);
  30 + gl.texParameteri(
  31 + gl.TEXTURE_2D,
  32 + gl.TEXTURE_MAG_FILTER,
  33 + gl.NEAREST);
  34 + gl.texParameteri(
  35 + gl.TEXTURE_2D,
  36 + gl.TEXTURE_MIN_FILTER,
  37 + gl.NEAREST);
  38 + gl.bindTexture(gl.TEXTURE_2D, null);
  39 + okToRun = true;
  40 + }
  41 +
  42 + function initTexture(gl) {
  43 + webGLTexture = gl.createTexture();
  44 + webGLTexture.image = new Image();
  45 + webGLTexture.image.onload = function () {
  46 + handleTextureLoaded(gl, webGLTexture)
  47 + }
  48 + //webGLTexture.image.src = "P3D/images/webgl-logo-256.jpg";
  49 + webGLTexture.image.src = "gravatar-256.jpg";
  50 + }
  51 +
  52 + function initWebGL(canvas) {
  53 + var gl = null;
  54 + var msg = "Your browser does not support WebGL, " +
  55 + "or it is not enabled by default.";
  56 + try {
  57 + gl = canvas.getContext("experimental-webgl");
  58 + }
  59 + catch (e) {
  60 + msg = "Error creating WebGL Context!: " + e.toString();
  61 + }
  62 + if (!gl) {
  63 + alert(msg);
  64 + throw new Error(msg);
  65 + }
  66 +
  67 + return gl;
  68 + }
  69 +
  70 + function initViewport(gl, canvas) {
  71 + gl.viewport(0, 0, canvas.width, canvas.height);
  72 + }
  73 +
  74 + // Create the vertex, color, and index data for a
  75 + // multicolored cube
  76 + function createCube(gl) {
  77 + // Vertex Data
  78 + var vertexBuffer;
  79 + vertexBuffer = gl.createBuffer();
  80 + gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
  81 + var verts = [
  82 + // Front face
  83 + -1.0, -1.0, 1.0,
  84 + 1.0, -1.0, 1.0,
  85 + 1.0, 1.0, 1.0,
  86 + -1.0, 1.0, 1.0,
  87 + // Back face
  88 + -1.0, -1.0, -1.0,
  89 + -1.0, 1.0, -1.0,
  90 + 1.0, 1.0, -1.0,
  91 + 1.0, -1.0, -1.0,
  92 + // Top face
  93 + -1.0, 1.0, -1.0,
  94 + -1.0, 1.0, 1.0,
  95 + 1.0, 1.0, 1.0,
  96 + 1.0, 1.0, -1.0,
  97 + // Bottom face
  98 + -1.0, -1.0, -1.0,
  99 + 1.0, -1.0, -1.0,
  100 + 1.0, -1.0, 1.0,
  101 + -1.0, -1.0, 1.0,
  102 + // Right face
  103 + 1.0, -1.0, -1.0,
  104 + 1.0, 1.0, -1.0,
  105 + 1.0, 1.0, 1.0,
  106 + 1.0, -1.0, 1.0,
  107 + // Left face
  108 + -1.0, -1.0, -1.0,
  109 + -1.0, -1.0, 1.0,
  110 + -1.0, 1.0, 1.0,
  111 + -1.0, 1.0, -1.0
  112 + ];
  113 + gl.bufferData(
  114 + gl.ARRAY_BUFFER,
  115 + new Float32Array(verts),
  116 + gl.STATIC_DRAW);
  117 +
  118 + var texCoordBuffer = gl.createBuffer();
  119 + gl.bindBuffer(gl.ARRAY_BUFFER, texCoordBuffer);
  120 + var textureCoords = [
  121 + // Front face
  122 + 0.0, 0.0,
  123 + 1.0, 0.0,
  124 + 1.0, 1.0,
  125 + 0.0, 1.0,
  126 +
  127 + // Back face
  128 + 1.0, 0.0,
  129 + 1.0, 1.0,
  130 + 0.0, 1.0,
  131 + 0.0, 0.0,
  132 +
  133 + // Top face
  134 + 0.0, 1.0,
  135 + 0.0, 0.0,
  136 + 1.0, 0.0,
  137 + 1.0, 1.0,
  138 +
  139 + // Bottom face
  140 + 1.0, 1.0,
  141 + 0.0, 1.0,
  142 + 0.0, 0.0,
  143 + 1.0, 0.0,
  144 +
  145 + // Right face
  146 + 1.0, 0.0,
  147 + 1.0, 1.0,
  148 + 0.0, 1.0,
  149 + 0.0, 0.0,
  150 +
  151 + // Left face
  152 + 0.0, 0.0,
  153 + 1.0, 0.0,
  154 + 1.0, 1.0,
  155 + 0.0, 1.0,
  156 + ];
  157 + gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoords), gl.STATIC_DRAW);
  158 +
  159 + // Index data (defines the triangles to be drawn)
  160 + var cubeIndexBuffer = gl.createBuffer();
  161 + gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndexBuffer);
  162 + var cubeIndices = [
  163 + 0, 1, 2, 0, 2, 3, // Front face
  164 + 4, 5, 6, 4, 6, 7, // Back face
  165 + 8, 9, 10, 8, 10, 11, // Top face
  166 + 12, 13, 14, 12, 14, 15, // Bottom face
  167 + 16, 17, 18, 16, 18, 19, // Right face
  168 + 20, 21, 22, 20, 22, 23 // Left face
  169 + ];
  170 + gl.bufferData(
  171 + gl.ELEMENT_ARRAY_BUFFER,
  172 + new Uint16Array(cubeIndices),
  173 + gl.STATIC_DRAW);
  174 + var cube = {
  175 + buffer:vertexBuffer,
  176 + texCoordBuffer:texCoordBuffer,
  177 + indices:cubeIndexBuffer,
  178 + vertSize:3,
  179 + nVerts:24,
  180 + texCoordSize:2,
  181 + nTexCoords: 24,
  182 + nIndices:36,
  183 + primtype:gl.TRIANGLES};
  184 +
  185 + return cube;
  186 + }
  187 +
  188 + function initMatrices(canvas) {
  189 + modelViewMatrix = mat4.create();
  190 + mat4.translate(
  191 + modelViewMatrix, modelViewMatrix, [0, 0, -8]);
  192 +
  193 + // Create a project matrix with 45 degree field of view
  194 + projectionMatrix = mat4.create();
  195 + mat4.perspective(projectionMatrix, Math.PI / 4,
  196 + canvas.width / canvas.height, 1, 10000);
  197 +
  198 + rotationAxis = vec3.create();
  199 + vec3.normalize(rotationAxis, [1, 1, 1]);
  200 + }
  201 +
  202 + function createShader(gl, id, type) {
  203 + var shader;
  204 + var str = document.getElementById(id).text;
  205 + if (type == "fragment") {
  206 + shader = gl.createShader(gl.FRAGMENT_SHADER);
  207 + } else if (type == "vertex") {
  208 + shader = gl.createShader(gl.VERTEX_SHADER);
  209 + } else {
  210 + return null;
  211 + }
  212 +
  213 + gl.shaderSource(shader, str);
  214 + gl.compileShader(shader);
  215 +
  216 + if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
  217 + alert(gl.getShaderInfoLog(shader));
  218 + return null;
  219 + }
  220 +
  221 + return shader;
  222 + }
  223 +
  224 + function initShader(gl, vertex, fragment) {
  225 + // load and compile the fragment and vertex shader
  226 + var fragmentShader = createShader(gl, fragment, "fragment");
  227 + var vertexShader = createShader(gl, vertex, "vertex");
  228 +
  229 + // link them together into a new program
  230 + shaderProgram = gl.createProgram();
  231 + gl.attachShader(shaderProgram, vertexShader);
  232 + gl.attachShader(shaderProgram, fragmentShader);
  233 + gl.linkProgram(shaderProgram);
  234 +
  235 + // get pointers to the shader params
  236 + shaderVertexPositionAttribute = gl.getAttribLocation(
  237 + shaderProgram, "vertexPos");
  238 + gl.enableVertexAttribArray(shaderVertexPositionAttribute);
  239 + shaderTexCoordAttribute = gl.getAttribLocation(
  240 + shaderProgram, "texCoord");
  241 + gl.enableVertexAttribArray(shaderTexCoordAttribute);
  242 +
  243 + shaderProjectionMatrixUniform = gl.getUniformLocation(
  244 + shaderProgram, "projectionMatrix");
  245 + shaderModelViewMatrixUniform = gl.getUniformLocation(
  246 + shaderProgram, "modelViewMatrix");
  247 + shaderSamplerUniform = gl.getUniformLocation(
  248 + shaderProgram, "uSampler");
  249 +
  250 + if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
  251 + alert("Could not initialise shaders");
  252 + }
  253 + }
  254 +
  255 + function draw(gl, obj) {
  256 + // clear the background (transparent)
  257 + gl.clearColor(0.0, 0.0, 0.0, 1.0);
  258 + // // clear the background (black)
  259 + // gl.clearColor(0.0, 0.0, 0.0, 1.0);
  260 + gl.enable(gl.DEPTH_TEST);
  261 + gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  262 +
  263 + // set the shader to use
  264 + gl.useProgram(shaderProgram);
  265 +
  266 + // connect up the shader parameters: vertex position,
  267 + // color, and projection/model matrices
  268 + // set up the buffers
  269 + gl.bindBuffer(gl.ARRAY_BUFFER, obj.buffer);
  270 + gl.vertexAttribPointer(
  271 + shaderVertexPositionAttribute,
  272 + obj.vertSize,
  273 + gl.FLOAT,
  274 + false, 0, 0);
  275 + gl.bindBuffer(gl.ARRAY_BUFFER, obj.texCoordBuffer);
  276 + gl.vertexAttribPointer(
  277 + shaderTexCoordAttribute,
  278 + obj.texCoordSize,
  279 + gl.FLOAT,
  280 + false, 0, 0);
  281 + gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, obj.indices);
  282 + gl.uniformMatrix4fv(shaderProjectionMatrixUniform, false,
  283 + projectionMatrix);
  284 + gl.uniformMatrix4fv(shaderModelViewMatrixUniform, false,
  285 + modelViewMatrix);
  286 +
  287 + gl.activeTexture(gl.TEXTURE0);
  288 + gl.bindTexture(gl.TEXTURE_2D, webGLTexture);
  289 + gl.uniform1i(shaderSamplerUniform, 0);
  290 +
  291 + // draw the object
  292 + gl.drawElements(
  293 + obj.primtype, obj.nIndices, gl.UNSIGNED_SHORT, 0);
  294 + }
  295 +
  296 + function animate() {
  297 + var now = Date.now();
  298 + var deltat = now - currentTime;
  299 + currentTime = now;
  300 + var fract = deltat / duration;
  301 + var angle = Math.PI * 2 * fract;
  302 + mat4.rotate(
  303 + modelViewMatrix,
  304 + modelViewMatrix,
  305 + angle,
  306 + rotationAxis);
  307 + }
  308 +
  309 + function run(gl, cube) {
  310 + requestAnimationFrame(function() { run(gl, cube); });
  311 + if (okToRun) {
  312 + draw(gl, cube);
  313 + animate();
  314 + }
  315 + }
  316 +
  317 + function startGl() {
  318 + // Get A WebGL context
  319 + var canvas = document.getElementById("cube");
  320 + var gl = initWebGL(canvas);
  321 + var obj = createCube(gl);
  322 +
  323 + initViewport(gl, canvas);
  324 + initMatrices(canvas);
  325 + initShader(
  326 + gl,
  327 + "texture-vertex-shader",
  328 + "texture-fragment-shader");
  329 + initTexture(gl);
  330 + run(gl, obj);
  331 + }
  332 + </script>
  333 +
  334 + <script id="texture-vertex-shader" type="x-shader/x-vertex">
  335 + attribute vec3 vertexPos;
  336 + attribute vec2 texCoord;
  337 + uniform mat4 modelViewMatrix;
  338 + uniform mat4 projectionMatrix;
  339 + varying vec2 vTexCoord;
  340 + void main(void) {
  341 + // Return the transformed and projected vertex value
  342 + gl_Position = projectionMatrix * modelViewMatrix * vec4(vertexPos, 1.0);
  343 + // Output the texture coordinate in vTexCoord
  344 + vTexCoord = texCoord;
  345 + }
  346 + </script>
  347 +
  348 + <script id="texture-fragment-shader" type="x-shader/x-fragment">
  349 + precision mediump float;
  350 + varying vec2 vTexCoord;
  351 + uniform sampler2D uSampler;
  352 + void main(void) {
  353 + // Return the pixel color: always output white
  354 + gl_FragColor = texture2D(uSampler, vec2(vTexCoord.s, vTexCoord.t));
  355 + }
  356 + </script>
  357 + </head>
  358 +
  359 + <body onLoad="startGl()">
  360 + <canvas id="cube" width="500" height="500"></canvas>
  361 + </body>
  362 +</html>
  363 +<!-- vim: set ts=4 sw=4: -->
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