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<!--
O3D ZSorting.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
  "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
ZSorting.
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="o3djs/base.js"></script>

<!-- Our javascript code -->
<script type="text/javascript" id="o3dscript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.material');

// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;

// global variables
var g_timeMult = 1.0;
var g_framesRendered = 0;
var g_o3d;
var g_math;
var g_client;
var g_viewInfo;
var g_pack;
var g_clock = 0;
var g_finished = false;  // for selenium testing
var g_groupTransforms = [];
var GROUPS_ACROSS = 2;
var UNITS_ACROSS_GROUP = 2;
var TOTAL_ACROSS = GROUPS_ACROSS * UNITS_ACROSS_GROUP;
var HALF_WIDTH = TOTAL_ACROSS * 0.0;
var UNIT_SPACING = 100;

/**
 * Make a grid of transforms and put a teapot instance on each one
 * @param {!o3d.Pack} pack Pack to create transforms in.
 * @param {!o3d.Shape} shape Shape to instance.
 */
function createInstances(pack, shape) {
  for (var g = 0; g < GROUPS_ACROSS; g++) {
    for (var h = 0; h < GROUPS_ACROSS; h++) {
      for (var i = 0; i < GROUPS_ACROSS; i++) {
        var groupTransform = pack.createObject('Transform');
        g_groupTransforms[g_groupTransforms.length] = groupTransform;
        groupTransform.parent = g_client.root;
        groupTransform.translate(
            (g * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING,
            (h * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING,
            (i * UNITS_ACROSS_GROUP - HALF_WIDTH) * UNIT_SPACING);
        for (var x = 0; x < UNITS_ACROSS_GROUP; x++) {
          for (var y = 0; y < UNITS_ACROSS_GROUP; y++) {
            for (var z = 0; z < UNITS_ACROSS_GROUP; z++) {
              var transform = pack.createObject('Transform');
              transform.parent = groupTransform;
              transform.addShape(shape);
              transform.translate(
                  (x - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING,
                  (y - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING,
                  (z - UNITS_ACROSS_GROUP * 0.5) * UNIT_SPACING);
              transform.createParam('diffuse', 'ParamFloat4').value = [
                  (g * UNITS_ACROSS_GROUP + x) * (1 / TOTAL_ACROSS),
                  (h * UNITS_ACROSS_GROUP + y) * (1 / TOTAL_ACROSS),
                  (i * UNITS_ACROSS_GROUP + z) * (1 / TOTAL_ACROSS),
                  0.5];
            }
          }
        }
      }
    }
  }
}

/**
 * Creates the client area.
 */
function init() {
  o3djs.util.makeClients(initStep2);
}

/**
 * Initializes O3D and creates one shape.
 * @param {Array} clientElements Array of o3d object elements.
 */
function initStep2(clientElements) {
  // Initialize global variables and libraries.
  var o3dElement = clientElements[0];
  g_o3d = o3dElement.o3d;
  g_math = o3djs.math;
  g_client = o3dElement.client;

  // Creates a pack to manage our resources/assets
  g_pack = g_client.createPack();

  g_viewInfo = o3djs.rendergraph.createBasicView(
      g_pack,
      g_client.root,
      g_client.renderGraphRoot);

  // Create our projection matrix, with a vertical field of view of 45
  // degrees a near clipping plane of 0.1 and far clipping plane of 10000.
  g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
      g_math.degToRad(45),
      g_client.width / g_client.height,
      0.1,
      10000);

  // Create a Material.
  var material = o3djs.material.createBasicMaterial(
      g_pack, g_viewInfo, [1, 1, 1, 1], true);

  // Create a sphere.
  var shape = o3djs.primitives.createSphere(g_pack, material, 30, 20, 20);

  createInstances(g_pack, shape);

  // Setup an onrender callback for animation.
  g_client.setRenderCallback(onrender);

  g_finished = true;  // for selenium testing.
}

// spin the camera.
function onrender(renderEvent) {
  g_framesRendered++;
  // Get the number of seconds since the last render.
  var elapsedTime = renderEvent.elapsedTime;
  g_clock += elapsedTime * g_timeMult;

  var x = Math.sin(g_clock * 0.1) * 400;
  var z = Math.cos(g_clock * 0.1) * 400;
  var y = Math.sin(g_clock * 0.2) * 400;

  g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
      [x, y, z],  // eye
      [0, 0, 0],  // target
      [0, 1, 0]); // up
}

/**
 * Removes any callbacks so they don't get called after the page has unloaded.
 */
function unload() {
  if (g_client) {
    g_client.cleanup();
  }
}
</script>
</head>
<body>
<h1>ZSorting</h1>
Objects get zsorted for transparency.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 800px; height: 600px"></div>
<!-- End of O3D plugin -->
</body>
</html>