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comparison: content/canvas/test/webgl-mochitest/webgl-util.js
content/canvas/test/webgl-mochitest/webgl-util.js
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:209187b19014 |
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| 1 WebGLUtil = (function() { | |
| 2 // --------------------------------------------------------------------------- | |
| 3 // Error handling (for obvious failures, such as invalid element ids) | |
| 4 | |
| 5 function defaultErrorFunc(str) { | |
| 6 console.log('Error: ' + str); | |
| 7 } | |
| 8 | |
| 9 var gErrorFunc = defaultErrorFunc; | |
| 10 function setErrorFunc(func) { | |
| 11 gErrorFunc = func; | |
| 12 } | |
| 13 | |
| 14 function error(str) { | |
| 15 gErrorFunc(str); | |
| 16 } | |
| 17 | |
| 18 // --------------------------------------------------------------------------- | |
| 19 // Warning handling (for failures that may be intentional) | |
| 20 | |
| 21 function defaultWarningFunc(str) { | |
| 22 console.log('Warning: ' + str); | |
| 23 } | |
| 24 | |
| 25 var gWarningFunc = defaultWarningFunc; | |
| 26 function setWarningFunc(func) { | |
| 27 gWarningFunc = func; | |
| 28 } | |
| 29 | |
| 30 function warning(str) { | |
| 31 gWarningFunc(str); | |
| 32 } | |
| 33 | |
| 34 // --------------------------------------------------------------------------- | |
| 35 // WebGL helpers | |
| 36 | |
| 37 function getWebGL(canvasId, requireConformant) { | |
| 38 // `requireConformant` will default to falsey if it is not supplied. | |
| 39 | |
| 40 var canvas = document.getElementById(canvasId); | |
| 41 | |
| 42 var gl = null; | |
| 43 try { | |
| 44 gl = canvas.getContext('webgl'); | |
| 45 } catch(e) {} | |
| 46 | |
| 47 if (!gl && !requireConformant) { | |
| 48 try { | |
| 49 gl = canvas.getContext('experimental-webgl'); | |
| 50 } catch(e) {} | |
| 51 } | |
| 52 | |
| 53 if (!gl) { | |
| 54 error('WebGL context could not be retrieved from \'' + canvasId + '\'.'); | |
| 55 return null; | |
| 56 } | |
| 57 | |
| 58 return gl; | |
| 59 } | |
| 60 | |
| 61 function getContentFromElem(elem) { | |
| 62 var str = ""; | |
| 63 var k = elem.firstChild; | |
| 64 while (k) { | |
| 65 if (k.nodeType == 3) | |
| 66 str += k.textContent; | |
| 67 | |
| 68 k = k.nextSibling; | |
| 69 } | |
| 70 | |
| 71 return str; | |
| 72 } | |
| 73 | |
| 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 } | |
| 81 | |
| 82 var src = getContentFromElem(elem); | |
| 83 | |
| 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 } | |
| 93 | |
| 94 gl.shaderSource(shader, src); | |
| 95 gl.compileShader(shader); | |
| 96 | |
| 97 return shader; | |
| 98 } | |
| 99 | |
| 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; | |
| 105 | |
| 106 var prog = gl.createProgram(); | |
| 107 gl.attachShader(prog, vs); | |
| 108 gl.attachShader(prog, fs); | |
| 109 gl.linkProgram(prog); | |
| 110 | |
| 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 } | |
| 119 | |
| 120 return prog; | |
| 121 } | |
| 122 | |
| 123 return { | |
| 124 setErrorFunc: setErrorFunc, | |
| 125 setWarningFunc: setWarningFunc, | |
| 126 | |
| 127 getWebGL: getWebGL, | |
| 128 createShaderById: createShaderById, | |
| 129 createProgramByIds: createProgramByIds, | |
| 130 }; | |
| 131 })(); |
