content/canvas/test/webgl-mochitest/webgl-util.js@6474c204b198
content/canvas/test/webgl-mochitest/webgl-util.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 WebGLUtil = (function() {
2 // ---------------------------------------------------------------------------
3 // Error handling (for obvious failures, such as invalid element ids)
5 function defaultErrorFunc(str) {
6 console.log('Error: ' + str);
7 }
9 var gErrorFunc = defaultErrorFunc;
10 function setErrorFunc(func) {
11 gErrorFunc = func;
12 }
14 function error(str) {
15 gErrorFunc(str);
16 }
18 // ---------------------------------------------------------------------------
19 // Warning handling (for failures that may be intentional)
21 function defaultWarningFunc(str) {
22 console.log('Warning: ' + str);
23 }
25 var gWarningFunc = defaultWarningFunc;
26 function setWarningFunc(func) {
27 gWarningFunc = func;
28 }
30 function warning(str) {
31 gWarningFunc(str);
32 }
34 // ---------------------------------------------------------------------------
35 // WebGL helpers
37 function getWebGL(canvasId, requireConformant) {
38 // `requireConformant` will default to falsey if it is not supplied.
40 var canvas = document.getElementById(canvasId);
42 var gl = null;
43 try {
44 gl = canvas.getContext('webgl');
45 } catch(e) {}
47 if (!gl && !requireConformant) {
48 try {
49 gl = canvas.getContext('experimental-webgl');
50 } catch(e) {}
51 }
53 if (!gl) {
54 error('WebGL context could not be retrieved from \'' + canvasId + '\'.');
55 return null;
56 }
58 return gl;
59 }
61 function getContentFromElem(elem) {
62 var str = "";
63 var k = elem.firstChild;
64 while (k) {
65 if (k.nodeType == 3)
66 str += k.textContent;
68 k = k.nextSibling;
69 }
71 return str;
72 }
74 // Returns a valid shader, or null on errors.
75 function createShaderById(gl, id) {
76 var elem = document.getElementById(id);
77 if (!elem) {
78 error('Failed to create shader from non-existent id \'' + id + '\'.');
79 return null;
80 }
82 var src = getContentFromElem(elem);
84 var shader;
85 if (elem.type == "x-shader/x-fragment") {
86 shader = gl.createShader(gl.FRAGMENT_SHADER);
87 } else if (elem.type == "x-shader/x-vertex") {
88 shader = gl.createShader(gl.VERTEX_SHADER);
89 } else {
90 error('Bad MIME type for shader \'' + id + '\': ' + elem.type + '.');
91 return null;
92 }
94 gl.shaderSource(shader, src);
95 gl.compileShader(shader);
97 return shader;
98 }
100 function createProgramByIds(gl, vsId, fsId) {
101 var vs = createShaderById(gl, vsId);
102 var fs = createShaderById(gl, fsId);
103 if (!vs || !fs)
104 return null;
106 var prog = gl.createProgram();
107 gl.attachShader(prog, vs);
108 gl.attachShader(prog, fs);
109 gl.linkProgram(prog);
111 if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
112 var str = "Shader program linking failed:";
113 str += "\nShader program info log:\n" + gl.getProgramInfoLog(prog);
114 str += "\n\nVert shader log:\n" + gl.getShaderInfoLog(vs);
115 str += "\n\nFrag shader log:\n" + gl.getShaderInfoLog(fs);
116 warning(str);
117 return null;
118 }
120 return prog;
121 }
123 return {
124 setErrorFunc: setErrorFunc,
125 setWarningFunc: setWarningFunc,
127 getWebGL: getWebGL,
128 createShaderById: createShaderById,
129 createProgramByIds: createProgramByIds,
130 };
131 })();
