The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/content/canvas/test/webgl-mochitest/webgl-util.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,131 @@
     1.4 +WebGLUtil = (function() {
     1.5 +  // ---------------------------------------------------------------------------
     1.6 +  // Error handling (for obvious failures, such as invalid element ids)
     1.7 +
     1.8 +  function defaultErrorFunc(str) {
     1.9 +    console.log('Error: ' + str);
    1.10 +  }
    1.11 +
    1.12 +  var gErrorFunc = defaultErrorFunc;
    1.13 +  function setErrorFunc(func) {
    1.14 +    gErrorFunc = func;
    1.15 +  }
    1.16 +
    1.17 +  function error(str) {
    1.18 +    gErrorFunc(str);
    1.19 +  }
    1.20 +
    1.21 +  // ---------------------------------------------------------------------------
    1.22 +  // Warning handling (for failures that may be intentional)
    1.23 +
    1.24 +  function defaultWarningFunc(str) {
    1.25 +    console.log('Warning: ' + str);
    1.26 +  }
    1.27 +
    1.28 +  var gWarningFunc = defaultWarningFunc;
    1.29 +  function setWarningFunc(func) {
    1.30 +    gWarningFunc = func;
    1.31 +  }
    1.32 +
    1.33 +  function warning(str) {
    1.34 +    gWarningFunc(str);
    1.35 +  }
    1.36 +
    1.37 +  // ---------------------------------------------------------------------------
    1.38 +  // WebGL helpers
    1.39 +
    1.40 +  function getWebGL(canvasId, requireConformant) {
    1.41 +    // `requireConformant` will default to falsey if it is not supplied.
    1.42 +
    1.43 +    var canvas = document.getElementById(canvasId);
    1.44 +
    1.45 +    var gl = null;
    1.46 +    try {
    1.47 +      gl = canvas.getContext('webgl');
    1.48 +    } catch(e) {}
    1.49 +
    1.50 +    if (!gl && !requireConformant) {
    1.51 +      try {
    1.52 +        gl = canvas.getContext('experimental-webgl');
    1.53 +      } catch(e) {}
    1.54 +    }
    1.55 +
    1.56 +    if (!gl) {
    1.57 +      error('WebGL context could not be retrieved from \'' + canvasId + '\'.');
    1.58 +      return null;
    1.59 +    }
    1.60 +
    1.61 +    return gl;
    1.62 +  }
    1.63 +
    1.64 +  function getContentFromElem(elem) {
    1.65 +    var str = "";
    1.66 +    var k = elem.firstChild;
    1.67 +    while (k) {
    1.68 +      if (k.nodeType == 3)
    1.69 +        str += k.textContent;
    1.70 +
    1.71 +      k = k.nextSibling;
    1.72 +    }
    1.73 +
    1.74 +    return str;
    1.75 +  }
    1.76 +
    1.77 +  // Returns a valid shader, or null on errors.
    1.78 +  function createShaderById(gl, id) {
    1.79 +    var elem = document.getElementById(id);
    1.80 +    if (!elem) {
    1.81 +      error('Failed to create shader from non-existent id \'' + id + '\'.');
    1.82 +      return null;
    1.83 +    }
    1.84 +
    1.85 +    var src = getContentFromElem(elem);
    1.86 +
    1.87 +    var shader;
    1.88 +    if (elem.type == "x-shader/x-fragment") {
    1.89 +      shader = gl.createShader(gl.FRAGMENT_SHADER);
    1.90 +    } else if (elem.type == "x-shader/x-vertex") {
    1.91 +      shader = gl.createShader(gl.VERTEX_SHADER);
    1.92 +    } else {
    1.93 +      error('Bad MIME type for shader \'' + id + '\': ' + elem.type + '.');
    1.94 +      return null;
    1.95 +    }
    1.96 +
    1.97 +    gl.shaderSource(shader, src);
    1.98 +    gl.compileShader(shader);
    1.99 +
   1.100 +    return shader;
   1.101 +  }
   1.102 +
   1.103 +  function createProgramByIds(gl, vsId, fsId) {
   1.104 +    var vs = createShaderById(gl, vsId);
   1.105 +    var fs = createShaderById(gl, fsId);
   1.106 +    if (!vs || !fs)
   1.107 +      return null;
   1.108 +
   1.109 +    var prog = gl.createProgram();
   1.110 +    gl.attachShader(prog, vs);
   1.111 +    gl.attachShader(prog, fs);
   1.112 +    gl.linkProgram(prog);
   1.113 +
   1.114 +    if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
   1.115 +      var str = "Shader program linking failed:";
   1.116 +      str += "\nShader program info log:\n" + gl.getProgramInfoLog(prog);
   1.117 +      str += "\n\nVert shader log:\n" + gl.getShaderInfoLog(vs);
   1.118 +      str += "\n\nFrag shader log:\n" + gl.getShaderInfoLog(fs);
   1.119 +      warning(str);
   1.120 +      return null;
   1.121 +    }
   1.122 +
   1.123 +    return prog;
   1.124 +  }
   1.125 +
   1.126 +  return {
   1.127 +    setErrorFunc: setErrorFunc,
   1.128 +    setWarningFunc: setWarningFunc,
   1.129 +
   1.130 +    getWebGL: getWebGL,
   1.131 +    createShaderById: createShaderById,
   1.132 +    createProgramByIds: createProgramByIds,
   1.133 +  };
   1.134 +})();