<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL Out Of Memory Test</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>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="2" height="2"> </canvas>
<script>
"use strict";
debug("This tests WebGL running out of memory.");

debug("");
debug("Canvas.getContext");

var wtu = WebGLTestUtils;
var gl = wtu.create3DContext("canvas");
if (!gl) {
  testFailed("context does not exist");
} else {
  testPassed("context exists");

  debug("");
  debug("Allocating shaders.");

  function makeBigShader() {
    var lines = [];
    var line = "// ";
    for (var ii = 0; ii < 1024; ++ii) {
      line += String.fromCharCode(48 + ii % 10);
    }
    for (var ii = 0; ii < 1024; ++ii) {
      lines[ii] = line;
    }
    var oneMB = lines.join();
    for (var ii = 0; ii < 64; ++ii) {
      lines[ii] = oneMB;
    }
    return lines.join("\n");
  }

  var shaderSource = makeBigShader();
  debug("created " + Math.floor(shaderSource.length / 1024 / 1024) + "MB shader");

  var intervalId;
  var count = 0;

  function makeShader() {
    ++count;
    debug ("creating shader #" + count + " mem = " + Math.floor(shaderSource.length * count / 1024 / 1024) + "MB");
    var shader = gl.createShader(gl.VERTEX_SHADER);
    if (shader == null) {
      window.clearInterval(intervalId);
      testPassed("createShader returns null");  // not sure this is a passing
      finishTest();
    } else {
      gl.shaderSource(shader, shaderSource);
      var err = gl.getError();
      if (err != gl.NO_ERROR) {
        window.clearInterval(intervalId);
        assertMsg(err == gl.OUT_OF_MEMORY, "shaderSource returns OUT_OF_MEMORY");
        finishTest();
      }
    }
  }

  intervalId = window.setInterval(makeShader, 1000/15);
}
</script>
<script src="../js/js-test-post.js"></script>

</body>
</html>
