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<head>
<meta charset="utf-8">
<title>Test if GenerateMipmap on immutable texture with large BASE_LEVEL triggers a crash</title>
<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
<script src="../../../js/js-test-pre.js"></script>
<script src="../../../js/webgl-test-utils.js"></script>
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<body>
<canvas id="example" width="24" height="24"></canvas>
<div id="description"></div>
<div id="console"></div>
<script>
"use strict";
description("This is a regression test for crbug.com/913301");
debug("");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("example", null, 2);
gl.clearColor(0, 1, 0, 1);

var targets = [gl.TEXTURE_2D, gl.TEXTURE_3D];
for (var ii = 0; ii < targets.length; ++ii) {
  gl.clear(gl.COLOR_BUFFER_BIT);
  var target = targets[ii];
  var tex = gl.createTexture();
  gl.bindTexture(target, tex);
  gl.texParameteri(target, gl.TEXTURE_BASE_LEVEL, 1416354905);
  gl.texParameteri(target, gl.TEXTURE_MAX_LEVEL, 5);
  gl.texParameteri(target, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
  gl.texParameteri(target, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
  if (target == gl.TEXTURE_2D)
    gl.texStorage2D(target, 5, gl.R8, 32, 32);
  else
    gl.texStorage3D(target, 5, gl.R8, 32, 32, 32);
  // Should not crash calling generateMipmap.
  gl.generateMipmap(target);
  gl.deleteTexture(tex);
  // If crashed, readPixels() won't be able to work correctly.
  wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green", 5);
  wtu.glErrorShouldBe(gl, gl.NO_ERROR);
}

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