Remove everthing except conformance tests in the deps/third_party/webgl

third_party/webgl/sdk/tests/conformance/resources/webgl-test-utils.js

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-WebGLTestUtils = (function() {
-
-/**
- * Wrapped logging function.
- * @param {string} msg The message to log.
- */
-var log = function(msg) {
-  if (window.console && window.console.log) {
-    window.console.log(msg);
-  }
-};
-
-/**
- * Wrapped logging function.
- * @param {string} msg The message to log.
- */
-var error = function(msg) {
-  if (window.console) {
-    if (window.console.error) {
-      window.console.error(msg);
-    }
-    else if (window.console.log) {
-      window.console.log(msg);
-    }
-  }
-};
-
-/**
- * Turn off all logging.
- */
-var loggingOff = function() {
-  log = function() {};
-  error = function() {};
-};
-
-/**
- * Converts a WebGL enum to a string
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} value The enum value.
- * @return {string} The enum as a string.
- */
-var glEnumToString = function(gl, value) {
-  for (var p in gl) {
-    if (gl[p] == value) {
-      return p;
-    }
-  }
-  return "0x" + value.toString(16);
-};
-
-var lastError = "";
-
-/**
- * Returns the last compiler/linker error.
- * @return {string} The last compiler/linker error.
- */
-var getLastError = function() {
-  return lastError;
-};
-
-/**
- * Whether a haystack ends with a needle.
- * @param {string} haystack String to search
- * @param {string} needle String to search for.
- * @param {boolean} True if haystack ends with needle.
- */
-var endsWith = function(haystack, needle) {
-  return haystack.substr(haystack.length - needle.length) === needle;
-};
-
-/**
- * Whether a haystack starts with a needle.
- * @param {string} haystack String to search
- * @param {string} needle String to search for.
- * @param {boolean} True if haystack starts with needle.
- */
-var startsWith = function(haystack, needle) {
-  return haystack.substr(0, needle.length) === needle;
-};
-
-/**
- * A vertex shader for a single texture.
- * @type {string}
- */
-var simpleTextureVertexShader = [
-  'attribute vec4 vPosition;',
-  'attribute vec2 texCoord0;',
-  'varying vec2 texCoord;',
-  'void main() {',
-  '    gl_Position = vPosition;',
-  '    texCoord = texCoord0;',
-  '}'].join('\n');
-
-/**
- * A fragment shader for a single texture.
- * @type {string}
- */
-var simpleTextureFragmentShader = [
-  'precision mediump float;',
-  'uniform sampler2D tex;',
-  'varying vec2 texCoord;',
-  'void main() {',
-  '    gl_FragData[0] = texture2D(tex, texCoord);',
-  '}'].join('\n');
-
-/**
- * Creates a simple texture vertex shader.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @return {!WebGLShader}
- */
-var setupSimpleTextureVertexShader = function(gl) {
-    return loadShader(gl, simpleTextureVertexShader, gl.VERTEX_SHADER);
-};
-
-/**
- * Creates a simple texture fragment shader.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @return {!WebGLShader}
- */
-var setupSimpleTextureFragmentShader = function(gl) {
-    return loadShader(
-        gl, simpleTextureFragmentShader, gl.FRAGMENT_SHADER);
-};
-
-/**
- * Creates a program, attaches shaders, binds attrib locations, links the
- * program and calls useProgram.
- * @param {!Array.<!WebGLShader>} shaders The shaders to attach .
- * @param {!Array.<string>} opt_attribs The attribs names.
- * @param {!Array.<number>} opt_locations The locations for the attribs.
- */
-var setupProgram = function(gl, shaders, opt_attribs, opt_locations) {
-  var program = gl.createProgram();
-  for (var ii = 0; ii < shaders.length; ++ii) {
-    gl.attachShader(program, shaders[ii]);
-  }
-  if (opt_attribs) {
-    for (var ii = 0; ii < opt_attribs.length; ++ii) {
-      gl.bindAttribLocation(
-          program,
-          opt_locations ? opt_locations[ii] : ii,
-          opt_attribs[ii]);
-    }
-  }
-  gl.linkProgram(program);
-
-  // Check the link status
-  var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
-  if (!linked) {
-      // something went wrong with the link
-      lastError = gl.getProgramInfoLog (program);
-      error("Error in program linking:" + lastError);
-
-      gl.deleteProgram(program);
-      return null;
-  }
-
-  gl.useProgram(program);
-  return program;
-};
-
-/**
- * Creates a simple texture program.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} opt_positionLocation The attrib location for position.
- * @param {number} opt_texcoordLocation The attrib location for texture coords.
- * @return {WebGLProgram}
- */
-var setupSimpleTextureProgram = function(
-    gl, opt_positionLocation, opt_texcoordLocation) {
-  opt_positionLocation = opt_positionLocation || 0;
-  opt_texcoordLocation = opt_texcoordLocation || 1;
-  var vs = setupSimpleTextureVertexShader(gl);
-  var fs = setupSimpleTextureFragmentShader(gl);
-  if (!vs || !fs) {
-    return null;
-  }
-  var program = setupProgram(
-      gl,
-      [vs, fs],
-      ['vPosition', 'texCoord0'],
-      [opt_positionLocation, opt_texcoordLocation]);
-  if (!program) {
-    gl.deleteShader(fs);
-    gl.deleteShader(vs);
-  }
-  gl.useProgram(program);
-  return program;
-};
-
-/**
- * Creates buffers for a textured unit quad and attaches them to vertex attribs.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} opt_positionLocation The attrib location for position.
- * @param {number} opt_texcoordLocation The attrib location for texture coords.
- * @return {!Array.<WebGLBuffer>} The buffer objects that were
- *      created.
- */
-var setupUnitQuad = function(gl, opt_positionLocation, opt_texcoordLocation) {
-  opt_positionLocation = opt_positionLocation || 0;
-  opt_texcoordLocation = opt_texcoordLocation || 1;
-  var objects = [];
-
-  var vertexObject = gl.createBuffer();
-  gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
-  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
-       1.0,  1.0, 0.0,
-      -1.0,  1.0, 0.0,
-      -1.0, -1.0, 0.0,
-       1.0,  1.0, 0.0,
-      -1.0, -1.0, 0.0,
-       1.0, -1.0, 0.0]), gl.STATIC_DRAW);
-  gl.enableVertexAttribArray(opt_positionLocation);
-  gl.vertexAttribPointer(opt_positionLocation, 3, gl.FLOAT, false, 0, 0);
-  objects.push(vertexObject);
-
-  var vertexObject = gl.createBuffer();
-  gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
-  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
-      1.0, 1.0,
-      0.0, 1.0,
-      0.0, 0.0,
-      1.0, 1.0,
-      0.0, 0.0,
-      1.0, 0.0]), gl.STATIC_DRAW);
-  gl.enableVertexAttribArray(opt_texcoordLocation);
-  gl.vertexAttribPointer(opt_texcoordLocation, 2, gl.FLOAT, false, 0, 0);
-  objects.push(vertexObject);
-  return objects;
-};
-
-/**
- * Creates a program and buffers for rendering a textured quad.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} opt_positionLocation The attrib location for position.
- * @param {number} opt_texcoordLocation The attrib location for texture coords.
- * @return {!WebGLProgram}
- */
-var setupTexturedQuad = function(
-    gl, opt_positionLocation, opt_texcoordLocation) {
-  var program = setupSimpleTextureProgram(
-      gl, opt_positionLocation, opt_texcoordLocation);
-  setupUnitQuad(gl, opt_positionLocation, opt_texcoordLocation);
-  return program;
-};
-
-/**
- * Creates a unit quad with only positions of a given rez
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} gridRez The resolution of the mesh grid.
- * @param {number} opt_positionLocation The attrib location for position.
- */
-var setupQuad = function (
-    gl, gridRes, opt_positionLocation, opt_flipOddTriangles) {
-  var positionLocation = opt_positionLocation || 0;
-  var objects = [];
-
-  var vertsAcross = gridRes + 1;
-  var numVerts = vertsAcross * vertsAcross;
-  var positions = new Float32Array(numVerts * 3);
-  var indices = new Uint16Array(6 * gridRes * gridRes);
-
-  var poffset = 0;
-
-  for (var yy = 0; yy <= gridRes; ++yy) {
-    for (var xx = 0; xx <= gridRes; ++xx) {
-      positions[poffset + 0] = -1 + 2 * xx / gridRes;
-      positions[poffset + 1] = -1 + 2 * yy / gridRes;
-      positions[poffset + 2] = 0;
-
-      poffset += 3;
-    }
-  }
-
-  var tbase = 0;
-  for (var yy = 0; yy < gridRes; ++yy) {
-    var index = yy * vertsAcross;
-    for (var xx = 0; xx < gridRes; ++xx) {
-      indices[tbase + 0] = index + 0;
-      indices[tbase + 1] = index + 1;
-      indices[tbase + 2] = index + vertsAcross;
-      indices[tbase + 3] = index + vertsAcross;
-      indices[tbase + 4] = index + 1;
-      indices[tbase + 5] = index + vertsAcross + 1;
-
-      if (opt_flipOddTriangles) {
-        indices[tbase + 4] = index + vertsAcross + 1;
-        indices[tbase + 5] = index + 1;
-      }
-
-      index += 1;
-      tbase += 6;
-    }
-  }
-
-  var buf = gl.createBuffer();
-  gl.bindBuffer(gl.ARRAY_BUFFER, buf);
-  gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
-  gl.enableVertexAttribArray(positionLocation);
-  gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, 0, 0);
-  objects.push(buf);
-
-  var buf = gl.createBuffer();
-  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buf);
-  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
-  objects.push(buf);
-
-  return objects;
-};
-
-/**
- * Fills the given texture with a solid color
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {!WebGLTexture} tex The texture to fill.
- * @param {number} width The width of the texture to create.
- * @param {number} height The height of the texture to create.
- * @param {!Array.<number>} color The color to fill with. A 4 element array
- *        where each element is in the range 0 to 255.
- * @param {number} opt_level The level of the texture to fill. Default = 0.
- */
-var fillTexture = function(gl, tex, width, height, color, opt_level) {
-  opt_level = opt_level || 0;
-  var numPixels = width * height;
-  var size = numPixels * 4;
-  var buf = new Uint8Array(size);
-  for (var ii = 0; ii < numPixels; ++ii) {
-    var off = ii * 4;
-    buf[off + 0] = color[0];
-    buf[off + 1] = color[1];
-    buf[off + 2] = color[2];
-    buf[off + 3] = color[3];
-  }
-  gl.bindTexture(gl.TEXTURE_2D, tex);
-  gl.texImage2D(
-      gl.TEXTURE_2D, opt_level, gl.RGBA, width, height, 0,
-      gl.RGBA, gl.UNSIGNED_BYTE, buf);
-  };
-
-/**
- * Creates a textures and fills it with a solid color
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} width The width of the texture to create.
- * @param {number} height The height of the texture to create.
- * @param {!Array.<number>} color The color to fill with. A 4 element array
- *        where each element is in the range 0 to 255.
- * @return {!WebGLTexture}
- */
-var createColoredTexture = function(gl, width, height, color) {
-  var tex = gl.createTexture();
-  fillTexture(gl, tex, width, height, color);
-  return tex;
-};
-
-/**
- * Draws a previously setup quad.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {!Array.<number>} opt_color The color to fill clear with before
- *        drawing. A 4 element array where each element is in the range 0 to
- *        255. Default [255, 255, 255, 255]
- */
-var drawQuad = function(gl, opt_color) {
-  opt_color = opt_color || [255, 255, 255, 255];
-  gl.clearColor(
-      opt_color[0] / 255,
-      opt_color[1] / 255,
-      opt_color[2] / 255,
-      opt_color[3] / 255);
-  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
-  gl.drawArrays(gl.TRIANGLES, 0, 6);
-};
-
-/**
- * Checks that a portion of a canvas is 1 color.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} x left corner of region to check.
- * @param {number} y bottom corner of region to check.
- * @param {number} width width of region to check.
- * @param {number} height width of region to check.
- * @param {!Array.<number>} color The color to fill clear with before drawing. A
- *        4 element array where each element is in the range 0 to 255.
- * @param {string} msg Message to associate with success. Eg ("should be red").
- * @param {number} errorRange Optional. Acceptable error in
- *        color checking. 0 by default.
- */
-var checkCanvasRect = function(gl, x, y, width, height, color, msg, errorRange) {
-  errorRange = errorRange || 0;
-  var buf = new Uint8Array(width * height * 4);
-  gl.readPixels(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, buf);
-  for (var i = 0; i < width * height; ++i) {
-    var offset = i * 4;
-    for (var j = 0; j < color.length; ++j) {
-      if (Math.abs(buf[offset + j] - color[j]) > errorRange) {
-        testFailed(msg);
-        var was = buf[offset + 0].toString();
-        for (j = 1; j < color.length; ++j) {
-          was += "," + buf[offset + j];
-        }
-        debug('expected: ' + color + ' was ' + was);
-        return;
-      }
-    }
-  }
-  testPassed(msg);
-};
-
-/**
- * Checks that an entire canvas is 1 color.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {!Array.<number>} color The color to fill clear with before drawing. A
- *        4 element array where each element is in the range 0 to 255.
- * @param {string} msg Message to associate with success. Eg ("should be red").
- * @param {number} errorRange Optional. Acceptable error in
- *        color checking. 0 by default.
- */
-var checkCanvas = function(gl, color, msg, errorRange) {
-  checkCanvasRect(gl, 0, 0, gl.canvas.width, gl.canvas.height, color, msg, errorRange);
-};
-
-/**
- * Loads a texture, calls callback when finished.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} url URL of image to load
- * @param {function(!Image): void} callback Function that gets called after
- *        image has loaded
- * @return {!WebGLTexture} The created texture.
- */
-var loadTexture = function(gl, url, callback) {
-    var texture = gl.createTexture();
-    gl.bindTexture(gl.TEXTURE_2D, texture);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
-    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
-    var image = new Image();
-    image.onload = function() {
-        gl.bindTexture(gl.TEXTURE_2D, texture);
-        gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
-        gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
-        callback(image);
-    };
-    image.src = url;
-    return texture;
-};
-
-/**
- * Creates a webgl context.
- * @param {!Canvas} opt_canvas The canvas tag to get context from. If one is not
- *     passed in one will be created.
- * @return {!WebGLContext} The created context.
- */
-var create3DContext = function(opt_canvas, opt_attributes) {
-  opt_canvas = opt_canvas || document.createElement("canvas");
-  var context = null;
-  try {
-    context = opt_canvas.getContext("webgl", opt_attributes);
-  } catch(e) {}
-  if (!context) {
-    try {
-      context = opt_canvas.getContext("experimental-webgl", opt_attributes);
-    } catch(e) {}
-  }
-  if (!context) {
-    testFailed("Unable to fetch WebGL rendering context for Canvas");
-  }
-  return context;
-}
-
-/**
- * Gets a GLError value as a string.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} err The webgl error as retrieved from gl.getError().
- * @return {string} the error as a string.
- */
-var getGLErrorAsString = function(gl, err) {
-  if (err === gl.NO_ERROR) {
-    return "NO_ERROR";
-  }
-  for (var name in gl) {
-    if (gl[name] === err) {
-      return name;
-    }
-  }
-  return err.toString();
-};
-
-/**
- * Wraps a WebGL function with a function that throws an exception if there is
- * an error.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} fname Name of function to wrap.
- * @return {function} The wrapped function.
- */
-var createGLErrorWrapper = function(context, fname) {
-  return function() {
-    var rv = context[fname].apply(context, arguments);
-    var err = context.getError();
-    if (err != 0)
-      throw "GL error " + getGLErrorAsString(err) + " in " + fname;
-    return rv;
-  };
-};
-
-/**
- * Creates a WebGL context where all functions are wrapped to throw an exception
- * if there is an error.
- * @param {!Canvas} canvas The HTML canvas to get a context from.
- * @return {!Object} The wrapped context.
- */
-function create3DContextWithWrapperThatThrowsOnGLError(canvas) {
-  var context = create3DContext(canvas);
-  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) {
-      error("createContextWrapperThatThrowsOnGLError: Error accessing " + i);
-    }
-  }
-  wrap.getError = function() {
-      return context.getError();
-  };
-  return wrap;
-};
-
-/**
- * Tests that an evaluated expression generates a specific GL error.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {number} glError The expected gl error.
- * @param {string} evalSTr The string to evaluate.
- */
-var shouldGenerateGLError = function(gl, glError, evalStr) {
-  var exception;
-  try {
-    eval(evalStr);
-  } catch (e) {
-    exception = e;
-  }
-  if (exception) {
-    testFailed(evalStr + " threw exception " + exception);
-  } else {
-    var err = gl.getError();
-    if (err != glError) {
-      testFailed(evalStr + " expected: " + getGLErrorAsString(gl, glError) + ". Was " + getGLErrorAsString(gl, err) + ".");
-    } else {
-      testPassed(evalStr + " was expected value: " + getGLErrorAsString(gl, glError) + ".");
-    }
-  }
-};
-
-/**
- * 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
- */
-var glErrorShouldBe = function(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);
-  }
-};
-
-/**
- * Links a WebGL program, throws if there are errors.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {!WebGLProgram} program The WebGLProgram to link.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- */
-var linkProgram = function(gl, program, opt_errorCallback) {
-  // Link the program
-  gl.linkProgram(program);
-
-  // Check the link status
-  var linked = gl.getProgramParameter(program, gl.LINK_STATUS);
-  if (!linked) {
-    // something went wrong with the link
-    var error = gl.getProgramInfoLog (program);
-
-    testFailed("Error in program linking:" + error);
-
-    gl.deleteProgram(program);
-    //gl.deleteProgram(fragmentShader);
-    //gl.deleteProgram(vertexShader);
-  }
-};
-
-/**
- * Sets up WebGL with shaders.
- * @param {string} canvasName The id of the canvas.
- * @param {string} vshader The id of the script tag that contains the vertex
- *     shader source.
- * @param {string} fshader The id of the script tag that contains the fragment
- *     shader source.
- * @param {!Array.<string>} attribs An array of attrib names used to bind
- *     attribs to the ordinal of the name in this array.
- * @param {!Array.<number>} opt_clearColor The color to cla
- * @return {!WebGLContext} The created WebGLContext.
- */
-var setupWebGLWithShaders = function(
-   canvasName, vshader, fshader, attribs) {
-  var canvas = document.getElementById(canvasName);
-  var gl = create3DContext(canvas);
-  if (!gl) {
-    testFailed("No WebGL context found");
-  }
-
-  // create our shaders
-  var vertexShader = loadShaderFromScript(gl, vshader);
-  var fragmentShader = loadShaderFromScript(gl, fshader);
-
-  if (!vertexShader || !fragmentShader) {
-    return null;
-  }
-
-  // Create the program object
-  program = gl.createProgram();
-
-  if (!program) {
-    return null;
-  }
-
-  // Attach our two shaders to the program
-  gl.attachShader (program, vertexShader);
-  gl.attachShader (program, fragmentShader);
-
-  // Bind attributes
-  for (var i in attribs) {
-    gl.bindAttribLocation (program, i, attribs[i]);
-  }
-
-  linkProgram(gl, program);
-
-  gl.useProgram(program);
-
-  gl.clearColor(0,0,0,1);
-  gl.clearDepth(1);
-
-  gl.enable(gl.DEPTH_TEST);
-  gl.enable(gl.BLEND);
-  gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
-
-  gl.program = program;
-  return gl;
-};
-
-/**
- * Loads text from an external file. This function is synchronous.
- * @param {string} url The url of the external file.
- * @param {!function(bool, string): void} callback that is sent a bool for
- *     success and the string.
- */
-var loadTextFileAsync = function(url, callback) {
-  log ("loading: " + url);
-  var error = 'loadTextFileSynchronous failed to load url "' + url + '"';
-  var request;
-  if (window.XMLHttpRequest) {
-    request = new XMLHttpRequest();
-    if (request.overrideMimeType) {
-      request.overrideMimeType('text/plain');
-    }
-  } else {
-    throw 'XMLHttpRequest is disabled';
-  }
-  try {
-    request.open('GET', url, true);
-    request.onreadystatechange = function() {
-      if (request.readyState == 4) {
-        var text = '';
-        // HTTP reports success with a 200 status. The file protocol reports
-        // success with zero. HTTP does not use zero as a status code (they
-        // start at 100).
-        // https://developer.mozilla.org/En/Using_XMLHttpRequest
-        var success = request.status == 200 || request.status == 0;
-        if (success) {
-          text = request.responseText;
-        }
-        log("loaded: " + url);
-        callback(success, text);
-      }
-    };
-    request.send(null);
-  } catch (e) {
-    log("failed to load: " + url);
-    callback(false, '');
-  }
-};
-
-/**
- * Recursively loads a file as a list. Each line is parsed for a relative
- * path. If the file ends in .txt the contents of that file is inserted in
- * the list.
- *
- * @param {string} url The url of the external file.
- * @param {!function(bool, Array<string>): void} callback that is sent a bool
- *     for success and the array of strings.
- */
-var getFileListAsync = function(url, callback) {
-  var files = [];
-
-  var getFileListImpl = function(url, callback) {
-    var files = [];
-    if (url.substr(url.length - 4) == '.txt') {
-      loadTextFileAsync(url, function() {
-        return function(success, text) {
-          if (!success) {
-            callback(false, '');
-            return;
-          }
-          var lines = text.split('\n');
-          var prefix = '';
-          var lastSlash = url.lastIndexOf('/');
-          if (lastSlash >= 0) {
-            prefix = url.substr(0, lastSlash + 1);
-          }
-          var fail = false;
-          var count = 1;
-          var index = 0;
-          for (var ii = 0; ii < lines.length; ++ii) {
-            var str = lines[ii].replace(/^\s\s*/, '').replace(/\s\s*$/, '');
-            if (str.length > 4 &&
-                str[0] != '#' &&
-                str[0] != ";" &&
-                str.substr(0, 2) != "//") {
-              var names = str.split(/ +/);
-              new_url = prefix + str;
-              if (names.length == 1) {
-                new_url = prefix + str;
-                ++count;
-                getFileListImpl(new_url, function(index) {
-                  return function(success, new_files) {
-                    log("got files: " + new_files.length);
-                    if (success) {
-                      files[index] = new_files;
-                    }
-                    finish(success);
-                  };
-                }(index++));
-              } else {
-                var s = "";
-                var p = "";
-                for (var jj = 0; jj < names.length; ++jj) {
-                  s += p + prefix + names[jj];
-                  p = " ";
-                }
-                files[index++] = s;
-              }
-            }
-          }
-          finish(true);
-
-          function finish(success) {
-            if (!success) {
-              fail = true;
-            }
-            --count;
-            log("count: " + count);
-            if (!count) {
-              callback(!fail, files);
-            }
-          }
-        }
-      }());
-
-    } else {
-      files.push(url);
-      callback(true, files);
-    }
-  };
-
-  getFileListImpl(url, function(success, files) {
-    // flatten
-    var flat = [];
-    flatten(files);
-    function flatten(files) {
-      for (var ii = 0; ii < files.length; ++ii) {
-        var value = files[ii];
-        if (typeof(value) == "string") {
-          flat.push(value);
-        } else {
-          flatten(value);
-        }
-      }
-    }
-    callback(success, flat);
-  });
-};
-
-/**
- * Gets a file from a file/URL
- * @param {string} file the URL of the file to get.
- * @return {string} The contents of the file.
- */
-var readFile = function(file) {
-  var xhr = new XMLHttpRequest();
-  xhr.open("GET", file, false);
-  xhr.send();
-  return xhr.responseText.replace(/\r/g, "");
-};
-
-var readFileList = function(url) {
-  var files = [];
-  if (url.substr(url.length - 4) == '.txt') {
-    var lines = readFile(url).split('\n');
-    var prefix = '';
-    var lastSlash = url.lastIndexOf('/');
-    if (lastSlash >= 0) {
-      prefix = url.substr(0, lastSlash + 1);
-    }
-    for (var ii = 0; ii < lines.length; ++ii) {
-      var str = lines[ii].replace(/^\s\s*/, '').replace(/\s\s*$/, '');
-      if (str.length > 4 &&
-          str[0] != '#' &&
-          str[0] != ";" &&
-          str.substr(0, 2) != "//") {
-        var names = str.split(/ +/);
-        if (names.length == 1) {
-          new_url = prefix + str;
-          files = files.concat(readFileList(new_url));
-        } else {
-          var s = "";
-          var p = "";
-          for (var jj = 0; jj < names.length; ++jj) {
-            s += p + prefix + names[jj];
-            p = " ";
-          }
-          files.push(s);
-        }
-      }
-    }
-  } else {
-    files.push(url);
-  }
-  return files;
-};
-
-/**
- * Loads a shader.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} shaderSource The shader source.
- * @param {number} shaderType The type of shader. 
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLShader} The created shader.
- */
-var loadShader = function(gl, shaderSource, shaderType, opt_errorCallback) {
-  var errFn = opt_errorCallback || error;
-  // Create the shader object
-  var shader = gl.createShader(shaderType);
-  if (shader == null) {
-    errFn("*** Error: unable to create shader '"+shaderSource+"'");
-    return null;
-  }
-
-  // Load the shader source
-  gl.shaderSource(shader, shaderSource);
-  var err = gl.getError();
-  if (err != gl.NO_ERROR) {
-    errFn("*** Error loading shader '" + shader + "':" + glEnumToString(gl, err));
-    return null;
-  }
-
-  // Compile the shader
-  gl.compileShader(shader);
-
-  // Check the compile status
-  var compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
-  if (!compiled) {
-    // Something went wrong during compilation; get the error
-    lastError = gl.getShaderInfoLog(shader);
-    errFn("*** Error compiling shader '" + shader + "':" + lastError);
-    gl.deleteShader(shader);
-    return null;
-  }
-
-  return shader;
-}
-
-/**
- * Loads a shader from a URL.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {file} file The URL of the shader source.
- * @param {number} type The type of shader.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLShader} The created shader.
- */
-var loadShaderFromFile = function(gl, file, type, opt_errorCallback) {
-  var shaderSource = readFile(file);
-  return loadShader(gl, shaderSource, type, opt_errorCallback);
-};
-
-/**
- * Loads a shader from a script tag.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} scriptId The id of the script tag.
- * @param {number} opt_shaderType The type of shader. If not passed in it will
- *     be derived from the type of the script tag.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLShader} The created shader.
- */
-var loadShaderFromScript = function(
-    gl, scriptId, opt_shaderType, opt_errorCallback) {
-  var shaderSource = "";
-  var shaderType;
-  var shaderScript = document.getElementById(scriptId);
-  if (!shaderScript) {
-    throw("*** Error: unknown script element" + scriptId);
-  }
-  shaderSource = shaderScript.text;
-
-  if (!opt_shaderType) {
-    if (shaderScript.type == "x-shader/x-vertex") {
-      shaderType = gl.VERTEX_SHADER;
-    } else if (shaderScript.type == "x-shader/x-fragment") {
-      shaderType = gl.FRAGMENT_SHADER;
-    } else if (shaderType != gl.VERTEX_SHADER && shaderType != gl.FRAGMENT_SHADER) {
-      throw("*** Error: unknown shader type");
-      return null;
-    }
-  }
-
-  return loadShader(
-      gl, shaderSource, opt_shaderType ? opt_shaderType : shaderType,
-      opt_errorCallback);
-};
-
-var loadStandardProgram = function(gl) {
-  var program = gl.createProgram();
-  gl.attachShader(program, loadStandardVertexShader(gl));
-  gl.attachShader(program, loadStandardFragmentShader(gl));
-  linkProgram(gl, program);
-  return program;
-};
-
-/**
- * Loads shaders from files, creates a program, attaches the shaders and links.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} vertexShaderPath The URL of the vertex shader.
- * @param {string} fragmentShaderPath The URL of the fragment shader.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLProgram} The created program.
- */
-var loadProgramFromFile = function(
-    gl, vertexShaderPath, fragmentShaderPath, opt_errorCallback) {
-  var program = gl.createProgram();
-  gl.attachShader(
-      program,
-      loadShaderFromFile(
-          gl, vertexShaderPath, gl.VERTEX_SHADER, opt_errorCallback));
-  gl.attachShader(
-      program,
-      loadShaderFromFile(
-          gl, fragmentShaderPath, gl.FRAGMENT_SHADER, opt_errorCallback));
-  linkProgram(gl, program, opt_errorCallback);
-  return program;
-};
-
-/**
- * Loads shaders from script tags, creates a program, attaches the shaders and
- * links.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} vertexScriptId The id of the script tag that contains the
- *        vertex shader.
- * @param {string} fragmentScriptId The id of the script tag that contains the
- *        fragment shader.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLProgram} The created program.
- */
-var loadProgramFromScript = function loadProgramFromScript(
-    gl, vertexScriptId, fragmentScriptId, opt_errorCallback) {
-  var program = gl.createProgram();
-  gl.attachShader(
-      program,
-      loadShaderFromScript(
-          gl, vertexScriptId, gl.VERTEX_SHADER, opt_errorCallback));
-  gl.attachShader(
-      program,
-      loadShaderFromScript(
-          gl, fragmentScriptId,  gl.FRAGMENT_SHADER, opt_errorCallback));
-  linkProgram(gl, program, opt_errorCallback);
-  return program;
-};
-
-/**
- * Loads shaders from source, creates a program, attaches the shaders and
- * links.
- * @param {!WebGLContext} gl The WebGLContext to use.
- * @param {string} vertexShader The vertex shader.
- * @param {string} fragmentShader The fragment shader.
- * @param {function(string): void) opt_errorCallback callback for errors. 
- * @return {!WebGLProgram} The created program.
- */
-var loadProgram = function(
-    gl, vertexShader, fragmentShader, opt_errorCallback) {
-  var program = gl.createProgram();
-  gl.attachShader(
-      program,
-      loadShader(
-          gl, vertexShader, gl.VERTEX_SHADER, opt_errorCallback));
-  gl.attachShader(
-      program,
-      loadShader(
-          gl, fragmentShader, gl.FRAGMENT_SHADER, opt_errorCallback));
-  linkProgram(gl, program, opt_errorCallback);
-  return program;
-};
-
-var basePath;
-var getBasePath = function() {
-  if (!basePath) {
-    var expectedBase = "webgl-test-utils.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) {
-        basePath = src.substr(0, l - expectedBase.length);
-      }
-    }
-  }
-  return basePath;
-};
-
-var loadStandardVertexShader = function(gl) {
-  return loadShaderFromFile(
-      gl, getBasePath() + "vertexShader.vert", gl.VERTEX_SHADER);
-};
-
-var loadStandardFragmentShader = function(gl) {
-  return loadShaderFromFile(
-      gl, getBasePath() + "fragmentShader.frag", gl.FRAGMENT_SHADER);
-};
-
-/**
- * Loads an image asynchronously.
- * @param {string} url URL of image to load.
- * @param {!function(!Element): void} callback Function to call
- *     with loaded image.
- */
-var loadImageAsync = function(url, callback) {
-  var img = document.createElement('img');
-  img.onload = function() {
-    callback(img);
-  };
-  img.src = url;
-};
-
-/**
- * Loads an array of images.
- * @param {!Array.<string>} urls URLs of images to load.
- * @param {!function(!{string, img}): void} callback. Callback
- *     that gets passed map of urls to img tags.
- */
-var loadImagesAsync = function(urls, callback) {
-  var count = 1;
-  var images = { };
-  function countDown() {
-    --count;
-    if (count == 0) {
-      callback(images);
-    }
-  }
-  function imageLoaded(url) {
-    return function(img) {
-      images[url] = img;
-      countDown();
-    }
-  }
-  for (var ii = 0; ii < urls.length; ++ii) {
-    ++count;
-    loadImageAsync(urls[ii], imageLoaded(urls[ii]));
-  }
-  countDown();
-};
-
-var getUrlArguments = function() {
-  var args = {};
-  try {
-    var s = window.location.href;
-    var q = s.indexOf("?");
-    var e = s.indexOf("#");
-    if (e < 0) {
-      e = s.length;
-    }
-    var query = s.substring(q + 1, e);
-    var pairs = query.split("&");
-    for (var ii = 0; ii < pairs.length; ++ii) {
-      var keyValue = pairs[ii].split("=");
-      var key = keyValue[0];
-      var value = decodeURIComponent(keyValue[1]);
-      args[key] = value;
-    }
-  } catch (e) {
-    throw "could not parse url";
-  }
-  return args;
-};
-
-return {
-  create3DContext: create3DContext,
-  create3DContextWithWrapperThatThrowsOnGLError:
-    create3DContextWithWrapperThatThrowsOnGLError,
-  checkCanvas: checkCanvas,
-  checkCanvasRect: checkCanvasRect,
-  createColoredTexture: createColoredTexture,
-  drawQuad: drawQuad,
-  endsWith: endsWith,
-  getFileListAsync: getFileListAsync,
-  getLastError: getLastError,
-  getUrlArguments: getUrlArguments,
-  glEnumToString: glEnumToString,
-  glErrorShouldBe: glErrorShouldBe,
-  fillTexture: fillTexture,
-  loadImageAsync: loadImageAsync,
-  loadImagesAsync: loadImagesAsync,
-  loadProgram: loadProgram,
-  loadProgramFromFile: loadProgramFromFile,
-  loadProgramFromScript: loadProgramFromScript,
-  loadShader: loadShader,
-  loadShaderFromFile: loadShaderFromFile,
-  loadShaderFromScript: loadShaderFromScript,
-  loadStandardProgram: loadStandardProgram,
-  loadStandardVertexShader: loadStandardVertexShader,
-  loadStandardFragmentShader: loadStandardFragmentShader,
-  loadTextFileAsync: loadTextFileAsync,
-  loadTexture: loadTexture,
-  log: log,
-  loggingOff: loggingOff,
-  error: error,
-  setupProgram: setupProgram,
-  setupQuad: setupQuad,
-  setupSimpleTextureFragmentShader: setupSimpleTextureFragmentShader,
-  setupSimpleTextureProgram: setupSimpleTextureProgram,
-  setupSimpleTextureVertexShader: setupSimpleTextureVertexShader,
-  setupTexturedQuad: setupTexturedQuad,
-  setupUnitQuad: setupUnitQuad,
-  setupWebGLWithShaders: setupWebGLWithShaders,
-  startsWith: startsWith,
-  shouldGenerateGLError: shouldGenerateGLError,
-  readFile: readFile,
-  readFileList: readFileList,
-
-  none: false
-};
-
-}());
-
-