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

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4   <meta http-equiv='content-type' content='text/html; charset=utf-8'/>
   5
   6   <title>Test contents of uninitialized buffers</title>
   7
   8   <script src='/tests/SimpleTest/SimpleTest.js'></script>
   9   <link rel='stylesheet' href='/tests/SimpleTest/test.css'>
  10   <script src='webgl-util.js'></script>
  11 </head>
  12
  13 <body>
  14 <script>
  15 'use strict';
  16
  17 function TestFB(gl) {
  18   var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
  19   ok(status == gl.FRAMEBUFFER_COMPLETE, 'FB should be complete.');
  20
  21   var pixel = new Uint8Array(4);
  22   gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixel);
  23
  24   ok(!pixel[0], 'R channel should be 0, was ' + pixel[0] + '.');
  25   ok(!pixel[1], 'G channel should be 0, was ' + pixel[1] + '.');
  26   ok(!pixel[2], 'B channel should be 0, was ' + pixel[2] + '.');
  27   ok(!pixel[3], 'A channel should be 0, was ' + pixel[3] + '.');
  28 }
  29
  30 function Test(contextAttribs) {
  31   ok(true, '===============================');
  32   ok(true, 'Testing ' + JSON.stringify(contextAttribs));
  33
  34   var c = document.createElement('canvas');
  35   var gl = c.getContext('webgl', contextAttribs);
  36   if (!gl) {
  37     todo(false, 'WebGL is unavailable.');
  38     return;
  39   }
  40
  41   var rb = gl.createRenderbuffer();
  42   gl.bindRenderbuffer(gl.RENDERBUFFER, rb);
  43
  44   var tex = gl.createTexture();
  45   gl.bindTexture(gl.TEXTURE_2D, tex);
  46
  47   var err = gl.getError();
  48   ok(!err, 'Error should be 0x0, was 0x' + err.toString(16));
  49   if (err)
  50     return;
  51
  52   var fb = gl.createFramebuffer();
  53   gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  54
  55   ok(true, 'Backed with RB');
  56   gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rb);
  57   gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA4, 1, 1);
  58   TestFB(gl);
  59
  60   ok(true, 'Backed with texture');
  61   gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
  62   gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
  63   TestFB(gl);
  64
  65   err = gl.getError();
  66   ok(!err, 'Error should be 0x0, was 0x' + err.toString(16));
  67 }
  68
  69 // Give ourselves a scope to return early from:
  70 (function() {
  71   // We test multiple configurations because we've had bugs regarding faking RGBX on
  72   // ANGLE: With alpha:false, uninitialized buffers were being filled with (0,0,0,1)
  73   // instead of (0,0,0,0).
  74   Test({alpha: false, antialias: false});
  75   Test({alpha: true, antialias: false});
  76   Test({alpha: false, antialias: true});
  77   Test({alpha: true, antialias: true});
  78
  79   ok(true, 'Test complete.');
  80 })();
  81
  82 </script>
  83 </body>
  84 </html>