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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL Behavior After Alert and Read Pixels Test</title>
<link rel="stylesheet" href="../resources/js-test-style.css"/>
<script src="../resources/desktop-gl-constants.js" type="text/javascript"></script>
<script src="../../debug/webgl-debug.js"></script>
<script src="../resources/js-test-pre.js"></script>
<script src="../conformance/resources/webgl-test.js"></script>
<script src="../conformance/resources/webgl-test-utils.js"></script>
</head>
<body>
<canvas id="canvas" width="100" height="100"> </canvas>
<div id="description">Verify WebGL behavior after an alert and then a readPixels()</div>
<div id="console"></div>
<script>
"use strict";
window.onload = init;

function checkPixels(buf, width, height, thresh) {
  for (var yy = 0; yy < height; ++yy) {
    for (var xx = 0; xx < width; ++xx) {
      var offset = (yy * width + xx) * 4;
      if (Math.abs(buf[offset] - 255) > thresh ||
          Math.abs(buf[offset + 1] - 0) > thresh ||
          Math.abs(buf[offset + 2] - 0) > thresh) {
        testFailed("Checking pixels");
        return false;
      }
    }
  }
  testPassed("Checking pixels");
  return true;
}

function init() {
  var wtu = WebGLTestUtils;
  var gl = wtu.create3DContext("canvas");
  gl.clearColor(1, 0, 0, 1);
  gl.clear(gl.COLOR_BUFFER_BIT);
  glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");

  wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);

  alert("Click me to continue");

  glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");
  wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);

  alert("Click me to continue");

  gl.clearColor(1, 0, 0, 1);
  gl.clear(gl.COLOR_BUFFER_BIT);
  wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
}

debug("");
var successfullyParsed = true;
</script>
<script>
"use strict";
</script>

</body>
</html>