Add webgl conformance tests r15841.

conformance/resources/webgl-test.js

+/*
+Copyright (C) 2011 Apple Computer, Inc.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+function webglTestLog(msg) {
+  if (window.console && window.console.log) {
+    window.console.log(msg);
+  }
+  if (document.getElementById("console")) {
+    var log = document.getElementById("console");
+    log.innerHTML += msg + "<br>";
+  }
+}
+
+//
+// create3DContext
+//
+// Returns the WebGLRenderingContext for any known implementation.
+//
+function create3DContext(canvas, attributes)
+{
+    if (!canvas)
+        canvas = document.createElement("canvas");
+    var context = null;
+    try {
+        context = canvas.getContext("webgl", attributes);
+    } catch(e) {}
+    if (!context) {
+        try {
+            context = canvas.getContext("experimental-webgl", attributes);
+        } catch(e) {}
+    }
+    if (!context) {
+        throw "Unable to fetch WebGL rendering context for Canvas";
+    }
+    return context;
+}
+
+function createGLErrorWrapper(context, fname) {
+    return function() {
+        var rv = context[fname].apply(context, arguments);
+        var err = context.getError();
+        if (err != 0)
+            throw "GL error " + err + " in " + fname;
+        return rv;
+    };
+}
+
+function create3DContextWithWrapperThatThrowsOnGLError(canvas, attributes) {
+  var context = create3DContext(canvas, attributes);
+  // Thanks to Ilmari Heikkinen for the idea on how to implement this so elegantly.
+  var wrap = {};
+  for (var i in context) {
+    try {
+      if (typeof context[i] == 'function') {
+        wrap[i] = createGLErrorWrapper(context, i);
+      } else {
+        wrap[i] = context[i];
+      }
+    } catch (e) {
+      webglTestLog("createContextWrapperThatThrowsOnGLError: Error accessing " + i);
+    }
+  }
+  wrap.getError = function() {
+      return context.getError();
+  };
+  return wrap;
+}
+
+function getGLErrorAsString(ctx, err) {
+  if (err === ctx.NO_ERROR) {
+    return "NO_ERROR";
+  }
+  for (var name in ctx) {
+    if (ctx[name] === err) {
+      return name;
+    }
+  }
+  return "0x" + err.toString(16);
+}
+
+// Pass undefined for glError to test that it at least throws some error
+function shouldGenerateGLError(ctx, glErrors, evalStr) {
+  if (!glErrors.length) {
+    glErrors = [glErrors];
+  }
+  var exception;
+  try {
+    eval(evalStr);
+  } catch (e) {
+    exception = e;
+  }
+  if (exception) {
+    testFailed(evalStr + " threw exception " + exception);
+  } else {
+    var err = ctx.getError();
+    if (glErrors.indexOf(err) < 0) {
+      var errStrs = [];
+      for (var ii = 0; ii < glErrors.length; ++ii) {
+        errStrs.push(getGLErrorAsString(ctx, glErrors[ii]));
+      }
+      testFailed(evalStr + " expected: " + errStrs.join(" or ") + ". Was " + getGLErrorAsString(ctx, err) + ".");
+    } else {
+      testPassed(evalStr + " generated expected GL error: " + getGLErrorAsString(ctx, err) + ".");
+    }
+  }
+}
+
+/**
+ * Tests that the first error GL returns is the specified error.
+ * @param {!WebGLContext} gl The WebGLContext to use.
+ * @param {number} glError The expected gl error.
+ * @param {string} opt_msg Optional additional message.
+ */
+function glErrorShouldBe(gl, glError, opt_msg) {
+  opt_msg = opt_msg || "";
+  var err = gl.getError();
+  if (err != glError) {
+    testFailed("getError expected: " + getGLErrorAsString(gl, glError) +
+               ". Was " + getGLErrorAsString(gl, err) + " : " + opt_msg);
+  } else {
+    testPassed("getError was expected value: " +
+                getGLErrorAsString(gl, glError) + " : " + opt_msg);
+  }
+};
+
+//
+// createProgram
+//
+// Create and return a program object, attaching each of the given shaders.
+//
+// If attribs are given, bind an attrib with that name at that index.
+//
+function createProgram(gl, vshaders, fshaders, attribs)
+{
+  if (typeof(vshaders) == "string")
+    vshaders = [vshaders];
+  if (typeof(fshaders) == "string")
+    fshaders = [fshaders];
+
+  var shaders = [];
+  var i;
+
+  for (i = 0; i < vshaders.length; ++i) {
+    var shader = loadShader(gl, vshaders[i], gl.VERTEX_SHADER);
+    if (!shader)
+      return null;
+    shaders.push(shader);
+  }
+
+  for (i = 0; i < fshaders.length; ++i) {
+    var shader = loadShader(gl, fshaders[i], gl.FRAGMENT_SHADER);
+    if (!shader)
+      return null;
+    shaders.push(shader);
+  }
+
+  var prog = gl.createProgram();
+  for (i = 0; i < shaders.length; ++i) {
+    gl.attachShader(prog, shaders[i]);
+  }
+
+  if (attribs) {
+    for (var i in attribs) {
+      gl.bindAttribLocation(prog, parseInt(i), attribs[i]);
+    }
+  }
+
+  gl.linkProgram(prog);
+
+  // Check the link status
+  var linked = gl.getProgramParameter(prog, gl.LINK_STATUS);
+  if (!linked) {
+    // something went wrong with the link
+    var error = gl.getProgramInfoLog(prog);
+    webglTestLog("Error in program linking:" + error);
+
+    gl.deleteProgram(prog);
+    for (i = 0; i < shaders.length; ++i)
+      gl.deleteShader(shaders[i]);
+    return null;
+  }
+
+  return prog;
+}
+
+//
+// initWebGL
+//
+// Initialize the Canvas element with the passed name as a WebGL object and return the
+// WebGLRenderingContext.
+//
+// Load shaders with the passed names and create a program with them. Return this program
+// in the 'program' property of the returned context.
+//
+// For each string in the passed attribs array, bind an attrib with that name at that index.
+// Once the attribs are bound, link the program and then use it.
+//
+// Set the clear color to the passed array (4 values) and set the clear depth to the passed value.
+// Enable depth testing and blending with a blend func of (SRC_ALPHA, ONE_MINUS_SRC_ALPHA)
+//
+function initWebGL(canvasName, vshader, fshader, attribs, clearColor, clearDepth, contextAttribs)
+{
+    var canvas = document.getElementById(canvasName);
+    var gl = create3DContext(canvas, contextAttribs);
+    if (!gl) {
+        alert("No WebGL context found");
+        return null;
+    }
+
+    // Create the program object
+    gl.program = createProgram(gl, vshader, fshader, attribs);
+    if (!gl.program)
+        return null;
+
+    gl.useProgram(gl.program);
+
+    gl.clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
+    gl.clearDepth(clearDepth);
+
+    gl.enable(gl.DEPTH_TEST);
+    gl.enable(gl.BLEND);
+    gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
+
+    return gl;
+}
+
+//
+// getShaderSource
+//
+// Load the source from the passed shader file.
+//
+function getShaderSource(file)
+{
+    var xhr = new XMLHttpRequest();
+    xhr.open("GET", file, false);
+    xhr.send();
+    return xhr.responseText;
+}
+
+
+//
+// loadShader
+//
+// 'shader' is either the id of a <script> element containing the shader source
+// string, the shader string itself,  or the URL of a file containing the shader
+// source. Load this shader and return the WebGLShader object corresponding to
+// it.
+//
+function loadShader(ctx, shaderId, shaderType, isFile)
+{
+    var shaderSource = "";
+
+    if (isFile)
+        shaderSource = getShaderSource(shaderId);
+    else {
+        var shaderScript = document.getElementById(shaderId);
+        if (!shaderScript) {
+            shaderSource = shaderId;
+        } else {
+            if (shaderScript.type == "x-shader/x-vertex") {
+                shaderType = ctx.VERTEX_SHADER;
+            } else if (shaderScript.type == "x-shader/x-fragment") {
+                shaderType = ctx.FRAGMENT_SHADER;
+            } else if (shaderType != ctx.VERTEX_SHADER && shaderType != ctx.FRAGMENT_SHADER) {
+                webglTestLog("*** Error: unknown shader type");
+                return null;
+            }
+
+            shaderSource = shaderScript.text;
+        }
+    }
+
+    // Create the shader object
+    var shader = ctx.createShader(shaderType);
+    if (shader == null) {
+        webglTestLog("*** Error: unable to create shader '"+shaderId+"'");
+        return null;
+    }
+
+    // Load the shader source
+    ctx.shaderSource(shader, shaderSource);
+
+    // Compile the shader
+    ctx.compileShader(shader);
+
+    // Check the compile status
+    var compiled = ctx.getShaderParameter(shader, ctx.COMPILE_STATUS);
+    if (!compiled) {
+        // Something went wrong during compilation; get the error
+        var error = ctx.getShaderInfoLog(shader);
+        webglTestLog("*** Error compiling shader '"+shader+"':"+error);
+        ctx.deleteShader(shader);
+        return null;
+    }
+
+    return shader;
+}
+
+function loadShaderFromFile(ctx, file, type)
+{
+    return loadShader(ctx, file, type, true);
+}
+
+function loadShaderFromScript(ctx, script)
+{
+    return loadShader(ctx, script, 0, false);
+}
+
+function loadStandardProgram(context) {
+    var program = context.createProgram();
+    context.attachShader(program, loadStandardVertexShader(context));
+    context.attachShader(program, loadStandardFragmentShader(context));
+    context.linkProgram(program);
+    return program;
+}
+
+function loadProgram(context, vertexShaderPath, fragmentShaderPath, isFile) {
+    isFile = (isFile === undefined) ? true : isFile;
+    var program = context.createProgram();
+    context.attachShader(program, loadShader(context, vertexShaderPath, context.VERTEX_SHADER, isFile));
+    context.attachShader(program, loadShader(context, fragmentShaderPath, context.FRAGMENT_SHADER, isFile));
+    context.linkProgram(program);
+    return program;
+}
+
+var getBasePathForResources = function() {
+  var expectedBase = "webgl-test.js";
+  var scripts = document.getElementsByTagName('script');
+  for (var script, i = 0; script = scripts[i]; i++) {
+    var src = script.src;
+    var l = src.length;
+    if (src.substr(l - expectedBase.length) == expectedBase) {
+      return src.substr(0, l - expectedBase.length);
+    }
+  }
+  throw 'oops';
+};
+
+
+function loadStandardVertexShader(context) {
+    return loadShader(
+        context, 
+        getBasePathForResources() + "vertexShader.vert", 
+        context.VERTEX_SHADER, 
+        true); 
+}
+
+function loadStandardFragmentShader(context) {
+    return loadShader(
+        context, 
+        getBasePathForResources() + "fragmentShader.frag", 
+        context.FRAGMENT_SHADER, 
+        true); 
+}
+
+//
+// makeBox
+//
+// Create a box with vertices, normals and texCoords. Create VBOs for each as well as the index array.
+// Return an object with the following properties:
+//
+//  normalObject        WebGLBuffer object for normals
+//  texCoordObject      WebGLBuffer object for texCoords
+//  vertexObject        WebGLBuffer object for vertices
+//  indexObject         WebGLBuffer object for indices
+//  numIndices          The number of indices in the indexObject
+//
+function makeBox(ctx)
+{
+    // box
+    //    v6----- v5
+    //   /|      /|
+    //  v1------v0|
+    //  | |     | |
+    //  | |v7---|-|v4
+    //  |/      |/
+    //  v2------v3
+    //
+    // vertex coords array
+    var vertices = new Float32Array(
+        [  1, 1, 1,  -1, 1, 1,  -1,-1, 1,   1,-1, 1,    // v0-v1-v2-v3 front
+           1, 1, 1,   1,-1, 1,   1,-1,-1,   1, 1,-1,    // v0-v3-v4-v5 right
+           1, 1, 1,   1, 1,-1,  -1, 1,-1,  -1, 1, 1,    // v0-v5-v6-v1 top
+          -1, 1, 1,  -1, 1,-1,  -1,-1,-1,  -1,-1, 1,    // v1-v6-v7-v2 left
+          -1,-1,-1,   1,-1,-1,   1,-1, 1,  -1,-1, 1,    // v7-v4-v3-v2 bottom
+           1,-1,-1,  -1,-1,-1,  -1, 1,-1,   1, 1,-1 ]   // v4-v7-v6-v5 back
+    );
+
+    // normal array
+    var normals = new Float32Array(
+        [  0, 0, 1,   0, 0, 1,   0, 0, 1,   0, 0, 1,     // v0-v1-v2-v3 front
+           1, 0, 0,   1, 0, 0,   1, 0, 0,   1, 0, 0,     // v0-v3-v4-v5 right
+           0, 1, 0,   0, 1, 0,   0, 1, 0,   0, 1, 0,     // v0-v5-v6-v1 top
+          -1, 0, 0,  -1, 0, 0,  -1, 0, 0,  -1, 0, 0,     // v1-v6-v7-v2 left
+           0,-1, 0,   0,-1, 0,   0,-1, 0,   0,-1, 0,     // v7-v4-v3-v2 bottom
+           0, 0,-1,   0, 0,-1,   0, 0,-1,   0, 0,-1 ]    // v4-v7-v6-v5 back
+       );
+
+
+    // texCoord array
+    var texCoords = new Float32Array(
+        [  1, 1,   0, 1,   0, 0,   1, 0,    // v0-v1-v2-v3 front
+           0, 1,   0, 0,   1, 0,   1, 1,    // v0-v3-v4-v5 right
+           1, 0,   1, 1,   0, 1,   0, 0,    // v0-v5-v6-v1 top
+           1, 1,   0, 1,   0, 0,   1, 0,    // v1-v6-v7-v2 left
+           0, 0,   1, 0,   1, 1,   0, 1,    // v7-v4-v3-v2 bottom
+           0, 0,   1, 0,   1, 1,   0, 1 ]   // v4-v7-v6-v5 back
+       );
+
+    // index array
+    var indices = new Uint8Array(
+        [  0, 1, 2,   0, 2, 3,    // front
+           4, 5, 6,   4, 6, 7,    // right
+           8, 9,10,   8,10,11,    // top
+          12,13,14,  12,14,15,    // left
+          16,17,18,  16,18,19,    // bottom
+          20,21,22,  20,22,23 ]   // back
+      );
+
+    var retval = { };
+
+    retval.normalObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.normalObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, normals, ctx.STATIC_DRAW);
+
+    retval.texCoordObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.texCoordObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, texCoords, ctx.STATIC_DRAW);
+
+    retval.vertexObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.vertexObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, vertices, ctx.STATIC_DRAW);
+
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, 0);
+
+    retval.indexObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, retval.indexObject);
+    ctx.bufferData(ctx.ELEMENT_ARRAY_BUFFER, indices, ctx.STATIC_DRAW);
+    ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, 0);
+
+    retval.numIndices = indices.length;
+
+    return retval;
+}
+
+//
+// makeSphere
+//
+// Create a sphere with the passed number of latitude and longitude bands and the passed radius.
+// Sphere has vertices, normals and texCoords. Create VBOs for each as well as the index array.
+// Return an object with the following properties:
+//
+//  normalObject        WebGLBuffer object for normals
+//  texCoordObject      WebGLBuffer object for texCoords
+//  vertexObject        WebGLBuffer object for vertices
+//  indexObject         WebGLBuffer object for indices
+//  numIndices          The number of indices in the indexObject
+//
+function makeSphere(ctx, radius, lats, longs)
+{
+    var geometryData = [ ];
+    var normalData = [ ];
+    var texCoordData = [ ];
+    var indexData = [ ];
+
+    for (var latNumber = 0; latNumber <= lats; ++latNumber) {
+        for (var longNumber = 0; longNumber <= longs; ++longNumber) {
+            var theta = latNumber * Math.PI / lats;
+            var phi = longNumber * 2 * Math.PI / longs;
+            var sinTheta = Math.sin(theta);
+            var sinPhi = Math.sin(phi);
+            var cosTheta = Math.cos(theta);
+            var cosPhi = Math.cos(phi);
+
+            var x = cosPhi * sinTheta;
+            var y = cosTheta;
+            var z = sinPhi * sinTheta;
+            var u = 1-(longNumber/longs);
+            var v = latNumber/lats;
+
+            normalData.push(x);
+            normalData.push(y);
+            normalData.push(z);
+            texCoordData.push(u);
+            texCoordData.push(v);
+            geometryData.push(radius * x);
+            geometryData.push(radius * y);
+            geometryData.push(radius * z);
+        }
+    }
+
+    longs += 1;
+    for (var latNumber = 0; latNumber < lats; ++latNumber) {
+        for (var longNumber = 0; longNumber < longs; ++longNumber) {
+            var first = (latNumber * longs) + (longNumber % longs);
+            var second = first + longs;
+            indexData.push(first);
+            indexData.push(second);
+            indexData.push(first+1);
+
+            indexData.push(second);
+            indexData.push(second+1);
+            indexData.push(first+1);
+        }
+    }
+
+    var retval = { };
+
+    retval.normalObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.normalObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, new Float32Array(normalData), ctx.STATIC_DRAW);
+
+    retval.texCoordObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.texCoordObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, new Float32Array(texCoordData), ctx.STATIC_DRAW);
+
+    retval.vertexObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ARRAY_BUFFER, retval.vertexObject);
+    ctx.bufferData(ctx.ARRAY_BUFFER, new Float32Array(geometryData), ctx.STATIC_DRAW);
+
+    retval.numIndices = indexData.length;
+    retval.indexObject = ctx.createBuffer();
+    ctx.bindBuffer(ctx.ELEMENT_ARRAY_BUFFER, retval.indexObject);
+    ctx.bufferData(ctx.ELEMENT_ARRAY_BUFFER, new Uint16Array(indexData), ctx.STREAM_DRAW);
+
+    return retval;
+}
+
+//
+// loadObj
+//
+// Load a .obj file from the passed URL. Return an object with a 'loaded' property set to false.
+// When the object load is complete, the 'loaded' property becomes true and the following
+// properties are set:
+//
+//  normalObject        WebGLBuffer object for normals
+//  texCoordObject      WebGLBuffer object for texCoords
+//  vertexObject        WebGLBuffer object for vertices
+//  indexObject         WebGLBuffer object for indices
+//  numIndices          The number of indices in the indexObject
+//
+function loadObj(ctx, url)
+{
+    var obj = { loaded : false };
+    obj.ctx = ctx;
+    var req = new XMLHttpRequest();
+    req.obj = obj;
+    req.onreadystatechange = function () { processLoadObj(req) };
+    req.open("GET", url, true);
+    req.send(null);
+    return obj;
+}
+
+function processLoadObj(req)
+{
+    webglTestLog("req="+req)
+    // only if req shows "complete"
+    if (req.readyState == 4) {
+        doLoadObj(req.obj, req.responseText);
+    }
+}
+
+function doLoadObj(obj, text)
+{
+    vertexArray = [ ];
+    normalArray = [ ];
+    textureArray = [ ];
+    indexArray = [ ];
+
+    var vertex = [ ];
+    var normal = [ ];
+    var texture = [ ];
+    var facemap = { };
+    var index = 0;
+
+    var lines = text.split("\n");
+    for (var lineIndex in lines) {
+        var line = lines[lineIndex].replace(/[ \t]+/g, " ").replace(/\s\s*$/, "");
+
+        // ignore comments
+        if (line[0] == "#")
+            continue;
+
+        var array = line.split(" ");
+        if (array[0] == "v") {
+            // vertex
+            vertex.push(parseFloat(array[1]));
+            vertex.push(parseFloat(array[2]));
+            vertex.push(parseFloat(array[3]));
+        }
+        else if (array[0] == "vt") {
+            // normal
+            texture.push(parseFloat(array[1]));
+            texture.push(parseFloat(array[2]));
+        }
+        else if (array[0] == "vn") {
+            // normal
+            normal.push(parseFloat(array[1]));
+            normal.push(parseFloat(array[2]));
+            normal.push(parseFloat(array[3]));
+        }
+        else if (array[0] == "f") {
+            // face
+            if (array.length != 4) {
+                webglTestLog("*** Error: face '"+line+"' not handled");
+                continue;
+            }
+
+            for (var i = 1; i < 4; ++i) {
+                if (!(array[i] in facemap)) {
+                    // add a new entry to the map and arrays
+                    var f = array[i].split("/");
+                    var vtx, nor, tex;
+
+                    if (f.length == 1) {
+                        vtx = parseInt(f[0]) - 1;
+                        nor = vtx;
+                        tex = vtx;
+                    }
+                    else if (f.length = 3) {
+                        vtx = parseInt(f[0]) - 1;
+                        tex = parseInt(f[1]) - 1;
+                        nor = parseInt(f[2]) - 1;
+                    }
+                    else {
+                        webglTestLog("*** Error: did not understand face '"+array[i]+"'");
+                        return null;
+                    }
+
+                    // do the vertices
+                    var x = 0;
+                    var y = 0;
+                    var z = 0;
+                    if (vtx * 3 + 2 < vertex.length) {
+                        x = vertex[vtx*3];
+                        y = vertex[vtx*3+1];
+                        z = vertex[vtx*3+2];
+                    }
+                    vertexArray.push(x);
+                    vertexArray.push(y);
+                    vertexArray.push(z);
+
+                    // do the textures
+                    x = 0;
+                    y = 0;
+                    if (tex * 2 + 1 < texture.length) {
+                        x = texture[tex*2];
+                        y = texture[tex*2+1];
+                    }
+                    textureArray.push(x);
+                    textureArray.push(y);
+
+                    // do the normals
+                    x = 0;
+                    y = 0;
+                    z = 1;
+                    if (nor * 3 + 2 < normal.length) {
+                        x = normal[nor*3];
+                        y = normal[nor*3+1];
+                        z = normal[nor*3+2];
+                    }
+                    normalArray.push(x);
+                    normalArray.push(y);
+                    normalArray.push(z);
+
+                    facemap[array[i]] = index++;
+                }
+
+                indexArray.push(facemap[array[i]]);
+            }
+        }
+    }
+
+    // set the VBOs
+    obj.normalObject = obj.ctx.createBuffer();
+    obj.ctx.bindBuffer(obj.ctx.ARRAY_BUFFER, obj.normalObject);
+    obj.ctx.bufferData(obj.ctx.ARRAY_BUFFER, new Float32Array(normalArray), obj.ctx.STATIC_DRAW);
+
+    obj.texCoordObject = obj.ctx.createBuffer();
+    obj.ctx.bindBuffer(obj.ctx.ARRAY_BUFFER, obj.texCoordObject);
+    obj.ctx.bufferData(obj.ctx.ARRAY_BUFFER, new Float32Array(textureArray), obj.ctx.STATIC_DRAW);
+
+    obj.vertexObject = obj.ctx.createBuffer();
+    obj.ctx.bindBuffer(obj.ctx.ARRAY_BUFFER, obj.vertexObject);
+    obj.ctx.bufferData(obj.ctx.ARRAY_BUFFER, new Float32Array(vertexArray), obj.ctx.STATIC_DRAW);
+
+    obj.numIndices = indexArray.length;
+    obj.indexObject = obj.ctx.createBuffer();
+    obj.ctx.bindBuffer(obj.ctx.ELEMENT_ARRAY_BUFFER, obj.indexObject);
+    obj.ctx.bufferData(obj.ctx.ELEMENT_ARRAY_BUFFER, new Uint16Array(indexArray), obj.ctx.STREAM_DRAW);
+
+    obj.loaded = true;
+}
+
+//
+// loadImageTexture
+//
+// Load the image at the passed url, place it in a new WebGLTexture object and return the WebGLTexture.
+//
+function loadImageTexture(ctx, url)
+{
+    var texture = ctx.createTexture();
+    texture.image = new Image();
+    texture.image.onload = function() { doLoadImageTexture(ctx, texture.image, texture) }
+    texture.image.src = url;
+    return texture;
+}
+
+function doLoadImageTexture(ctx, image, texture)
+{
+    ctx.enable(ctx.TEXTURE_2D);
+    ctx.bindTexture(ctx.TEXTURE_2D, texture);
+    ctx.texImage2D(ctx.TEXTURE_2D, 0, ctx.RGBA, ctx.RGBA, ctx.UNSIGNED_BYTE, image);
+    ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MAG_FILTER, ctx.LINEAR);
+    ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MIN_FILTER, ctx.LINEAR_MIPMAP_LINEAR);
+    ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_WRAP_S, ctx.CLAMP_TO_EDGE);
+    ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_WRAP_T, ctx.CLAMP_TO_EDGE);
+    ctx.generateMipmap(ctx.TEXTURE_2D)
+    ctx.bindTexture(ctx.TEXTURE_2D, 0);
+}
+
+//
+// Framerate object
+//
+// This object keeps track of framerate and displays it as the innerHTML text of the
+// HTML element with the passed id. Once created you call snapshot at the end
+// of every rendering cycle. Every 500ms the framerate is updated in the HTML element.
+//
+Framerate = function(id)
+{
+    this.numFramerates = 10;
+    this.framerateUpdateInterval = 500;
+    this.id = id;
+
+    this.renderTime = -1;
+    this.framerates = [ ];
+    self = this;
+    var fr = function() { self.updateFramerate() }
+    setInterval(fr, this.framerateUpdateInterval);
+}
+
+Framerate.prototype.updateFramerate = function()
+{
+    var tot = 0;
+    for (var i = 0; i < this.framerates.length; ++i)
+        tot += this.framerates[i];
+
+    var framerate = tot / this.framerates.length;
+    framerate = Math.round(framerate);
+    document.getElementById(this.id).innerHTML = "Framerate:"+framerate+"fps";
+}
+
+Framerate.prototype.snapshot = function()
+{
+    if (this.renderTime < 0)
+        this.renderTime = new Date().getTime();
+    else {
+        var newTime = new Date().getTime();
+        var t = newTime - this.renderTime;
+        var framerate = 1000/t;
+        this.framerates.push(framerate);
+        while (this.framerates.length > this.numFramerates)
+            this.framerates.shift();
+        this.renderTime = newTime;
+    }
+}