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

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <meta charset=utf-8>
   5 <script src='/tests/SimpleTest/SimpleTest.js'></script>
   6 </head>
   7 <body>
   8 <pre id=e_out></pre>
   9 <script>
  10 ok = window.ok || function(e, s) {
  11   e_out.textContent += `\n${!e ? 'FAIL' : 'pass'}: ${s}`;
  12 };
  13
  14 // -
  15
  16 const canvas = document.createElement('canvas')
  17 document.documentElement.appendChild(canvas)
  18 const gl = canvas.getContext('webgl2')
  19 gl.bindBuffer(gl.PIXEL_PACK_BUFFER, gl.createBuffer())
  20 gl.readPixels(0, 0, 0, 0, gl.getParameter(gl.IMPLEMENTATION_COLOR_READ_FORMAT), 0, 0);
  21 const err = gl.getError();
  22 ok(err == gl.INVALID_ENUM, `err: ${err}`);
  23
  24 ok(true, 'done');
  25 </script>
  26 </body>
  27 </html>