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render-mode.html
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render-mode.html
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<!--
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All rights reserved.
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notice, this list of conditions and the following disclaimer.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>
Render Mode Example.
</title>
<style type="text/css">
html, body {
height: 100%;
margin: 0;
padding: 0;
border: none;
}
</style>
</head>
<body onload="init();" onunload="uninit();">
<script type="text/javascript" src="../o3d-webgl/base.js"></script>
<script type="text/javascript" src="../o3djs/base.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.base.o3d = o3d;
o3djs.require('o3djs.webgl');
o3djs.require('o3djs.math');
o3djs.require('o3djs.quaternions');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.pack');
o3djs.require('o3djs.arcball');
o3djs.require('o3djs.event');
o3djs.require('o3djs.scene');
var g_root;
var g_o3d;
var g_o3dElement
var g_math;
var g_quaternions;
var g_client;
var g_aball;
var g_thisRot;
var g_lastRot;
var g_pack;
var g_viewInfo;
var g_o3dWidth = -1;
var g_o3dHeight = -1;
var g_framesRendered = 0;
var g_camera = {
eye: [0, 0, 5],
target: [0, 0, 0]
};
var g_dragging = false;
function startDragging(e) {
g_lastRot = g_thisRot;
g_aball.click([e.x, e.y]);
g_dragging = true;
}
function drag(e) {
if (g_dragging) {
var rotationQuat = g_aball.drag([e.x, e.y]);
var rot_mat = g_quaternions.quaternionToRotation(rotationQuat);
g_thisRot = g_math.matrix4.mul(g_lastRot, rot_mat);
var m = g_root.localMatrix;
g_math.matrix4.setUpper3x3(m, g_thisRot);
g_root.localMatrix = m;
updateClient();
}
}
function stopDragging(e) {
g_dragging = false;
}
function updateClient() {
// If we are in RENDERMODE_ON_DEMAND mode then set the render mode again
// which will cause the client re-render the display.
if (g_client.renderMode == g_o3d.Client.RENDERMODE_ON_DEMAND) {
g_client.render();
}
}
function scrollMe(e) {
if (e.deltaY) {
g_camera.eye =
g_math.mulScalarVector((e.deltaY < 0 ? 11 : 13) / 12, g_camera.eye);
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(g_camera.eye,
g_camera.target,
[0, 1, 0]);
updateClient();
}
}
function loadFile(path) {
function callback(pack, parent, exception) {
if (exception) {
alert('Could not load: ' + path + '\n' + exception);
return;
}
// Generate draw elements and setup material draw lists.
o3djs.pack.preparePack(pack, g_viewInfo);
}
// Create a new transform for the loaded file
var parent = g_pack.createObject('Transform');
parent.parent = g_client.root;
if (path != null) {
o3djs.scene.loadScene(g_client, g_pack, parent, path, callback);
}
return parent;
}
function setClientSize() {
var newWidth = g_client.width;
var newHeight = g_client.height;
if (newWidth != g_o3dWidth || newHeight != g_o3dHeight) {
g_o3dWidth = newWidth;
g_o3dHeight = newHeight;
// Set the perspective projection matrix
g_viewInfo.drawContext.projection = g_math.matrix4.perspective(
g_math.degToRad(45), g_o3dWidth / g_o3dHeight, 0.1, 100);
// Sets a new area size for arcball.
g_aball.setAreaSize(g_o3dWidth, g_o3dHeight);
//o3djs.dump.dump("areaWidth: " + g_o3dWidth + "\n");
//o3djs.dump.dump("areaHeight: " + g_o3dHeight + "\n");
}
}
function resize() {
setClientSize();
}
function setRenderMode(event) {
var mode = (event) ? event.target.value : window.event.srcElement.value;
switch (mode) {
case 'continuous':
g_client.renderMode = g_o3d.Client.RENDERMODE_CONTINUOUS;
break;
case 'ondemand':
g_client.renderMode = g_o3d.Client.RENDERMODE_ON_DEMAND;
break;
}
}
function onRender() {
g_framesRendered++;
g_viewInfo.clearBuffer.clearColor = [
1 / 38 * (g_framesRendered % 38),
1 / 39 * (g_framesRendered % 39),
1 / 41 * (g_framesRendered % 41),
1];
resize();
}
/**
* Creates the client area.
*/
function init() {
o3djs.webgl.makeClients(initStep2);
}
/**
* Initializes O3D and loads the scene into the transform graph.
* @param {Array} clientElements Array of o3d object elements.
*/
function initStep2(clientElements) {
var path = window.location.href;
var index = path.lastIndexOf('/');
path = path.substring(0, index + 1) + '../assets/teapot/scene.json';
g_o3dElement = clientElements[0];
g_o3d = g_o3dElement.o3d;
g_math = o3djs.math;
g_quaternions = o3djs.quaternions;
g_client = g_o3dElement.client;
g_pack = g_client.createPack();
g_lastRot = g_math.matrix4.identity();
g_thisRot = g_math.matrix4.identity();
// Create the render graph for a view.
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_client.root,
g_client.renderGraphRoot);
var root = g_client.root;
var target = [0, 0, 0];
var eye = [0, 0, 5];
var up = [0, 1, 0];
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(eye, target, up);
g_aball = o3djs.arcball.create(100, 100);
setClientSize();
g_root = loadFile(path);
o3djs.event.addEventListener(g_o3dElement, 'mousedown', startDragging);
o3djs.event.addEventListener(g_o3dElement, 'mousemove', drag);
o3djs.event.addEventListener(g_o3dElement, 'mouseup', stopDragging);
o3djs.event.addEventListener(g_o3dElement, 'wheel', scrollMe);
document.getElementById('rendermode0').onclick = setRenderMode;
document.getElementById('rendermode1').onclick = setRenderMode;
g_client.setRenderCallback(onRender);
window.onresize = updateClient;
}
/**
* Removes any callbacks so they don't get called after the page has unloaded.
*/
function uninit() {
if (g_client) {
g_client.cleanup();
}
}
</script>
<table width="100%" style="height:100%;">
<tr width="100%" style="height:100%;"><td valign="middle" align="center">
<h1>
Render Mode Example.
</h1>
<p>The point of this demo is to show that for certain kinds of 3d applications
that don't have animation, for example a map viewer, you can set the client's
render mode to RENDERMODE_ON_DEMAND which will render the 3d one time and then
stop rendering. This has the advantage of not wasting CPU cycles rendering
something that does not change over and over.</p>
<p>The background changes color each time the scene is rendered. The sample
should start with the scene being constantly rendered but click
RENDERMODE_ON_DEMAND and you'll see it rendered only when it needs to be
as determined by the sample. </p>
<table id="container" width="90%" height="60%" border="2">
<tr height="100%"><td>
<div id="o3d" style="width: 100%; height: 100%;"></div>
</td></tr>
</table>
<input type="radio" id="rendermode0" name="rendermode" value="continuous" checked="true"><label for="rendermode0">RENDERMODE_CONTINUOUS (draw as often as possible)</label><br/>
<input type="radio" id="rendermode1" name="rendermode" value="ondemand"><label for="rendermode1">RENDERMODE_ON_DEMAND (draw once then as the OS requests it like when a window is uncovered)</label><br/>
<p>
Drag The Mouse To Rotate<br/>
Scrollwheel To Zoom<br/>
Resize The Window To Resize The View
</p>
</td></tr></table>
</body>
</html>