chao
/
mini_cocopi


			
				
					
						
						
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							<!DOCTYPE html>
<html>
<!--
Copyright 2011 The Closure Library Authors. All Rights Reserved.

Use of this source code is governed by the Apache License, Version 2.0.
See the COPYING file for details.

Author: nicksantos@google.com (Nick Santos)
-->
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Closure Performance Tests - Vector math</title>
  <link rel="stylesheet" type="text/css"
        href="../testing/performancetable.css"/>
  <script src="../base.js"></script>
  <script>
    goog.require('goog.crypt');
    goog.require('goog.string');
    goog.require('goog.testing.PerformanceTable');
    goog.require('goog.testing.jsunit');
    goog.require('goog.vec.Vec4');
  </script>
</head>
<body>
  <h1>Closure Performance Tests - Vector Math</h1>
  <p>
    <strong>User-agent:</strong>
    <script>document.write(navigator.userAgent);</script>
  </p>
  <div id="perfTable"></div>
  <hr>

  <script>
    var table = new goog.testing.PerformanceTable(
        goog.dom.getElement('perfTable'));
    var createVec4FromValues = goog.vec.Vec4.createFromValues;
    var scaleVec4 = goog.vec.Vec4.scale;

    var negateVec4ByScaling = function(v, result) {
      return scaleVec4(v, -1, result);
    };

    var negateVec4ByNegation = function(v, result) {
      result[0] = -v[0];
      result[1] = -v[1];
      result[2] = -v[2];
      result[3] = -v[3];
      return result;
    };

    var negateVec4ByMultiplication = function(v, result) {
      result[0] = -1 * v[0];
      result[1] = -1 * v[1];
      result[2] = -1 * v[2];
      result[3] = -1 * v[3];
      return result;
    };

    function createRandomVec4() {
      return createVec4FromValues(
          Math.random(),
          Math.random(),
          Math.random(),
          Math.random());
    }

    function testNegateVec4ByScaling() {
      var v = createRandomVec4();
      for (var i = 0; i < 2000000; i++) {
        // Warm the trace tree to see if that makes a difference.
        scaleVec4(v, 1, v);
      }

      table.run(
          function() {
            for (var i = 0; i < 2000000; i++) {
              negateVec4ByScaling(v, v);
            }
          },
          'Negate vector by calling scale()');
    }

    function testNegateVec4ByNegation() {
      var v = createRandomVec4();
      for (var i = 0; i < 2000000; i++) {
        // Warm the trace tree to see if that makes a difference.
        scaleVec4(v, 1, v);
      }

      table.run(
          function() {
            for (var i = 0; i < 2000000; i++) {
              negateVec4ByNegation(v, v);
            }
          },
          'Negate vector by negating directly');
    }
  </script>
</body>
</html>