dom/canvas/test/webgl-mochitest/test_backbuffer_channels.html

   1 <!DOCTYPE HTML>
   2 <title>WebGL test: bug 958723</title>
   3 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   4 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   5 <script src="driver-info.js"></script>
   6 <script src="webgl-util.js"></script>
   7 <body>
   8 <script>
   9
  10 function TestAttribs(attribs) {
  11   ok(true, 'Testing attribs: ' + JSON.stringify(attribs));
  12   var canvas = document.createElement('canvas');
  13   var gl = canvas.getContext('experimental-webgl', attribs);
  14   ok(gl, 'No tested attribs should result in failure to create a context');
  15   if (!gl)
  16     return;
  17
  18   var actual = gl.getContextAttributes();
  19
  20   ok(actual.alpha == attribs.alpha,
  21      'Resulting `alpha` should match request.');
  22   ok(actual.premultipliedAlpha == attribs.premultipliedAlpha,
  23      'Resulting `premultipliedAlpha` should match request.');
  24   ok(actual.preserveDrawingBuffer == attribs.preserveDrawingBuffer,
  25      'Resulting `preserveDrawingBuffer` should match request.');
  26
  27   // "The depth, stencil and antialias attributes, when set to true, are
  28   // requests, not requirements."
  29   if (!attribs.antialias) {
  30     ok(!actual.antialias, 'No `antialias` if not requested.');
  31   }
  32   if (!attribs.depth) {
  33     ok(!actual.depth, 'No `depth` if not requested.');
  34   }
  35   if (!attribs.stencil) {
  36     ok(!actual.stencil, 'No `stencil` if not requested.');
  37   }
  38
  39   var hasAlpha = !!gl.getParameter(gl.ALPHA_BITS);
  40   var hasDepth = !!gl.getParameter(gl.DEPTH_BITS);
  41   var hasStencil = !!gl.getParameter(gl.STENCIL_BITS);
  42   var hasAntialias = !!gl.getParameter(gl.SAMPLES);
  43
  44   ok(hasAlpha == actual.alpha, 'Bits should match `alpha` attrib.');
  45   ok(hasAntialias == actual.antialias, 'Bits should match `antialias` attrib.');
  46   ok(hasDepth == actual.depth, 'Bits should match `depth` attrib.');
  47   ok(hasStencil == actual.stencil, 'Bits should match `stencil` attrib.');
  48 }
  49
  50 function CloneAttribs(attribs) {
  51   return {
  52     alpha: attribs.alpha,
  53     antialias: attribs.antialias,
  54     depth: attribs.depth,
  55     premultipliedAlpha: attribs.premultipliedAlpha,
  56     preserveDrawingBuffer: attribs.preserveDrawingBuffer,
  57     stencil: attribs.stencil,
  58   };
  59 }
  60
  61 function SplitForAttrib(list, attrib) {
  62   var ret = [];
  63
  64   for (var i in list) {
  65     var cur = list[i];
  66     if (cur[attrib])
  67       throw 'Attrib is already true.';
  68
  69     var clone = CloneAttribs(cur);
  70     clone[attrib] = true;
  71
  72     ret.push(cur);
  73     ret.push(clone);
  74   }
  75
  76   return ret;
  77 }
  78
  79 function GenAttribList() {
  80   var base = {
  81     alpha: false,
  82     antialias: false,
  83     depth: false,
  84     premultipliedAlpha: false,
  85     preserveDrawingBuffer: false,
  86     stencil: false,
  87   };
  88   var list = [base];
  89   list = SplitForAttrib(list, 'alpha');
  90   list = SplitForAttrib(list, 'antialias');
  91   list = SplitForAttrib(list, 'depth');
  92   list = SplitForAttrib(list, 'premultipliedAlpha');
  93   list = SplitForAttrib(list, 'preserveDrawingBuffer');
  94   list = SplitForAttrib(list, 'stencil');
  95
  96   if (list.length != 1<<6)
  97     throw 'Attribs list length wrong: ' + list.length;
  98
  99   return list;
 100 }
 101
 102 var list = GenAttribList();
 103 for (var i in list) {
 104   var attribs = list[i];
 105   TestAttribs(attribs);
 106 }
 107
 108 ok(true, 'Test complete.');
 109
 110 </script>
 111