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

   1 <!DOCTYPE HTML>
   2 <html>
   3 <head>
   4 <title>WebGL test: Check for error on ReadPixels from a depth-only FB.</title>
   5 <script src="/tests/SimpleTest/SimpleTest.js"></script>
   6 <link rel="stylesheet" href="/tests/SimpleTest/test.css">
   7 <script src="webgl-util.js"></script>
   8 <script src="driver-info.js"></script>
   9 </head>
  10 <body>
  11 <canvas id="c"></canvas>
  12 <script>
  13 "use strict";
  14
  15 (function() {
  16   var gl = c.getContext('webgl');
  17   if (!gl) {
  18     todo(gl, 'Get GL working here first.');
  19     return;
  20   }
  21
  22   var rb = gl.createRenderbuffer();
  23   gl.bindRenderbuffer(gl.RENDERBUFFER, rb);
  24   gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, 4, 4);
  25
  26   var fb = gl.createFramebuffer();
  27   gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  28   gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT,
  29                              gl.RENDERBUFFER, rb);
  30
  31   if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
  32     todo(false, 'Depth-only FB incomplete. This is valid.');
  33     return;
  34   }
  35
  36   ok(!gl.getError(), 'Should have no errors after constructing FB.');
  37
  38   var pixels = new Uint8Array([1, 2, 3, 4]);
  39   gl.readPixels(0, 0, // x,y
  40                 1, 1, // w,h
  41                 gl.RGBA, gl.UNSIGNED_BYTE, pixels);
  42
  43   ok(gl.getError() == gl.INVALID_OPERATION,
  44      '1x1 color read from a depth FB should generated INVALID_OP.');
  45   console.log('Data after 1x1 color-from-depth readpixels:');
  46   console.log(pixels);
  47
  48   gl.readPixels(0, 0, // x,y
  49                 0, 0, // w,h
  50                 gl.RGBA, gl.UNSIGNED_BYTE, pixels);
  51
  52   ok(gl.getError() == gl.INVALID_OPERATION,
  53      '0x0 color read from a depth FB should generated INVALID_OP.');
  54 })();
  55
  56 ok(true, 'Test complete.');
  57
  58 </script>
  59 </body>
  60 </html>