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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL gl.getParameter Strings Conformance Tests</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../resources/js-test-pre.js"></script>
<script src="../resources/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";
description("This test checks getParameter returns strings in the correct format");

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

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

  debug("");
  checkPrefix("WebGL 1.0", "VERSION");
  checkPrefix("WebGL GLSL ES 1.0", "SHADING_LANGUAGE_VERSION");
  shouldBeNonNull("gl.getParameter(gl.VENDOR)");
  shouldBeNonNull("gl.getParameter(gl.RENDERER)");
  shouldBe("gl.getError()", "gl.NO_ERROR");
}

function checkPrefix(expected, enum_val) {
  var s = gl.getParameter(gl[enum_val]);
  if (s != null &&
      s.length >= expected.length &&
      s.substring(0, expected.length) == expected) {
    testPassed("getParameter(gl." + enum_val + ") correctly started with " + expected);
  } else {
    testFailed("getParameter(gl." + enum_val + ") did not start with " + expected);
  }
}

debug("");
var successfullyParsed = true;

</script>
<script src="../../resources/js-test-post.js"></script>

</body>
</html>
