<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">

<script type="text/javascript" src="webgl-utils.js"></script>
<script type="text/javascript">
/* Hanging Framebuffer Test
 *
 * Clear the canvas to green, but create and bind a new framebuffer
 * before returning. This will fail if we blindly read from the bound
 * framebuffer, instead of binding to the screen and reading from that.
 *
 * How failure looks isn't well defined, since this is an empty framebuffer,
 * thus is incomplete, and should cause errors if it's read from.
 */

"use strict";

function renderGL(gl) {
  gl.clearColor(0.0, 1.0, 0.0, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);

  var fb = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

  gl.finish();
}

function renderFailure(canvas) {
  // This will also trigger RAF for us.
  var context = canvas.getContext("2d");
  context.fillText('WebGL failed.', 64, 64);
}

function runTest() {
  var canvas = document.getElementById("canvas");
  var gl = initGL(canvas);

  if (gl)
    renderGL(gl);
  else
    renderFailure(canvas);

  waitForComposite(testComplete);
}

function testComplete() {
  document.documentElement.removeAttribute("class");
}
</script>
</head>

<body onload="rAF(runTest);">
  <canvas id="canvas" width="256" height="256"></canvas>
</body>

</html>
