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graphic-o3d-samples-shader-test.htm / htm
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<!--
O3D Tutorial
In this tutorial, we load a scene file and then apply various shaders to it.
-->
<!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>
Shader Test
</title>
<style type="text/css">
html, body {
height: 100%;
margin: 0;
padding: 0;
border: none;
}
</style>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="o3djs/base.js"></script>
<!-- Our javascript code -->
<script type="text/javascript">
o3djs.require('o3djs.util');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.pack');
o3djs.require('o3djs.math');
o3djs.require('o3djs.camera');
o3djs.require('o3djs.effect');
o3djs.require('o3djs.loader');
// Events
// init() once the page has finished loading.
// unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;
// global variables
var g_o3d;
var g_client;
var g_viewInfo;
var g_o3dElement;
var g_pack;
var g_root;
var g_math;
var g_timeMult = 1;
var g_finished = false; // for selenium testing
var g_currentTimeParam;
var g_clock = 0;
var g_shaderSelection = 0;
var g_rotateOn = true;
var g_o3dWidth; // width of our client area
var g_o3dHeight; // height of our client area
var g_shaders = ['diffuse',
'checker',
'bump',
'bump',
'texture-only',
'texture-colormult',
'tangent',
'binormal',
'normal',
'solid-color',
'vertex-color',
'phong-with-colormult'];
var g_effects = [];
var g_bumpTextureSampler;
var g_bumpBumpsSampler;
// Our view and projection matrices
// The view matrix transforms objects from world space to view space.
var g_viewMatrix;
// The projection matrix projects objects from view space to the screen.
var g_projMatrix;
Returns the path of where the file is located
with the trailing slash
function getCurrentPath() {
var path = window.location.href;
var index = path.lastIndexOf('/');
return path.substring(0, index + 1);
}
Turn rotation on.
function turnRotateOn() {
g_rotateOn = true;
}
Turn rotation off.
function turnRotateOff() {
g_rotateOn = false;
}
This is the code to animate the rotation.
parameter: {o3d.RenderEvent} render_event The render event.
function onrender(render_event) {
var elapsedTime = render_event.elapsedTime * g_timeMult;
var newWidth = g_client.width;
var newHeight = g_client.height;
if (newWidth != g_o3dWidth || newHeight != g_o3dHeight) {
g_o3dWidth = newWidth;
g_o3dHeight = newHeight;
setupCamera(g_pack, g_root);
}
g_clock += elapsedTime * (g_rotateOn ? 1 : 0);
g_root.identity();
g_root.rotateY(g_clock);
g_currentTimeParam.value = g_clock;
}
Sets the camera based on the imported file.
parameter: {!o3d.Pack} pack Pack to create context in.
parameter: {!o3d.Transform} root Root of tree to search for camera info.
function setupCamera(pack, root) {
// Get a CameraInfo (an object with a view and projection matrix)
// using our javascript library function
var cameraInfo = o3djs.camera.getViewAndProjectionFromCameras(root,
g_o3dWidth,
g_o3dHeight);
// Copy the view and projection to the draw context.
g_viewInfo.drawContext.view = cameraInfo.view;
g_viewInfo.drawContext.projection = cameraInfo.projection;
}
Our callback is called once the scene has been loaded into memory
from the web or locally.
parameter: {!o3d.Pack} pack Variable referring to the scene's pack.
parameter: {!o3d.Transform} parent Transform parent.
parameter: {*} exception null if loading succeeded.
function sceneCallback(pack, parent, exception) {
if (exception) {
alert('Could not load scene\n' + exception);
return;
}
setupCamera(pack, parent);
// Start with diffuse as default
applyShader(pack, 0);
// Add some vertex colors because the teapot does not have any
// and yet the vertex color shader requires them.
var streamBanks = pack.getObjectsByClassName('o3d.StreamBank');
for (var ss = 0; ss < streamBanks.length; ++ss) {
var streamBank = streamBanks[ss];
if (!streamBank.getVertexStream(g_o3d.Stream.COLOR, 0)) {
var positionField = streamBank.getVertexStream(g_o3d.Stream.POSITION,
0).field;
var buffer = positionField.buffer;
var numElements = buffer.numElements;
var colorField = buffer.createField('FloatField', 4);
var colors = [];
for (var nn = 0; nn < numElements; ++nn) {
colors.push((nn * 40 / numElements) % 1,
(nn * 61 / numElements) % 1,
(nn * 83 / numElements) % 1,
1);
}
colorField.setAt(0, colors);
streamBank.setVertexStream(g_o3d.Stream.COLOR, 0, colorField, 0);
}
}
// Generate draw elements and setup material draw lists.
o3djs.pack.preparePack(pack, g_viewInfo);
}
Looks up a Param and if it exists sets its value.
parameter: {!o3d.ParamObject} object object to look for param on.
parameter: {string} name name of Param to look up.
parameter: {*} value Value to set param.
function setParam(object, paramName, value) {
var param = object.getParam(paramName);
if (param) {
param.value = value;
}
}
Apply the desired shader to our scene.
parameter: {!o3d.Pack} pack Variable referring to the scene's pack.
parameter: {number} shaderNumber Index into g_effects of which shader to use.
function applyShader(pack, shaderNumber) {
var materials = pack.getObjectsByClassName('o3d.Material');
// Make the change to each material. For our teapot, there is only one
// material.
for (var m = 0; m < materials.length; m++) {
var material = materials[m];
g_effects[shaderNumber].createUniformParameters(material);
material.effect = g_effects[shaderNumber];
// Set our shader values
var colorParamValue = [0.8, 0.8, 0.8, 1];
var lightPosParamValue = [600, 600, 1000];
setParam(material, 'lightPos', lightPosParamValue);
setParam(material, 'lightWorldPos', lightPosParamValue);
setParam(material, 'cameraEye', [197.58, -63.5702, 0]);
setParam(material, 'color', colorParamValue);
setParam(material, 'colorMult', [.75, .75, 75., 1]);
// only use the texture input addition to bump mapping if on selection 3
setParam(material, 'useTexture', (g_shaderSelection == 3) ? 1 : 0);
setParam(material, 'lightIntensity', [0.8, 0.8, 0.8, 1]);
setParam(material, 'ambientIntensity', [0.2, 0.2, 0.2, 1]);
setParam(material, 'emissive', [0, 0, 0, 1]);
setParam(material, 'ambient', [1, 1, 1, 1]);
setParam(material, 'diffuse', colorParamValue);
setParam(material, 'specular', [0.5, 0.5, 0.5, 1]);
setParam(material, 'shininess', 50);
setParam(material, 'BumpSampler', g_bumpBumpsSampler);
setParam(material, 'AmbientSampler', g_bumpTextureSampler);
setParam(material, 'DiffuseSampler', g_bumpTextureSampler);
setParam(material, 'texSampler0', g_bumpTextureSampler);
var timeParam = material.getParam('inputTime');
if (timeParam) {
timeParam.bind(g_currentTimeParam);
}
}
}
Creates our client area by looking for <div>s with an id that starts with
"o3d".
function init() {
o3djs.util.makeClients(initStep2);
}
Initializes O3D and loads the scene into the transform graph.
function initStep2(clientElements) {
// Initialize global variables and libraries.
g_o3dElement = clientElements[0];
g_o3d = g_o3dElement.o3d;
g_math = o3djs.math;
g_client = g_o3dElement.client;
// Get the width and height of our client area. We will need this to create
// a projection matrix.
g_o3dWidth = g_client.width;
g_o3dHeight = g_client.height;
// Creates a pack to manage our resources/assets
g_pack = g_client.createPack();
// Create the render graph for a view.
g_viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_client.root,
g_client.renderGraphRoot);
// Creates a transform to put our data on.
g_root = g_pack.createObject('Transform');
// Connects our root to the client's root.
g_root.parent = g_client.root;
var paramObject = g_pack.createObject('ParamObject');
g_currentTimeParam = paramObject.createParam('timeParam','ParamFloat');
// Load effects
for(var s = 0; s < g_shaders.length; s++) {
g_effects[s] = g_pack.createObject('Effect');
var shaderString = 'shaders/' + g_shaders[s] + '.shader';
o3djs.effect.loadEffect(g_effects[s], shaderString);
}
var loader = o3djs.loader.createLoader(initStep3);
loader.loadTexture(g_pack, 'assets/normalmap.dds',
function(texture, exception) {
if (exception) {
alert(exception);
} else {
g_bumpBumpsSampler = g_pack.createObject('Sampler');
g_bumpBumpsSampler.texture = texture;
g_bumpBumpsSampler.mipFilter = g_o3d.Sampler.LINEAR;
}
});
loader.loadTexture(g_pack, 'assets/rock_texture.jpg',
function(texture, exception) {
if (exception) {
alert(exception);
} else {
g_bumpTextureSampler = g_pack.createObject('Sampler');
g_bumpTextureSampler.texture = texture;
g_bumpTextureSampler.mipFilter = g_o3d.Sampler.LINEAR;
}
});
var scenePath = getCurrentPath() + 'assets/teapot.tgz';
loader.loadScene(g_client, g_pack, g_root, scenePath, sceneCallback);
loader.finish();
}
function initStep3() {
o3djs.event.addEventListener(g_o3dElement, 'mousedown', turnRotateOff);
o3djs.event.addEventListener(g_o3dElement, 'mouseup', turnRotateOn);
g_rotateOn = true;
// Tell our example to rotate.
g_client.setRenderCallback(onrender);
g_finished = true; // for selenium testing.
}
Swaps which shader we are using and applies it.
function changeShader() {
var shaderNumber = document.getElementById("shaderSelect").value;
g_shaderSelection = parseFloat(shaderNumber);
applyShader(g_pack, g_shaderSelection);
}
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>Shader Test</h1>
This example is useful for testing a shader or checking a scene. Clicking on the scene will temporarily stop rotation.
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 100%; height: 80%;"></div>
<!-- End of O3D plugin -->
<p>
<select id='shaderSelect' name='shaderSelect' onChange='changeShader()'>
<option value='0' selected>Diffuse</option>
<option value='1'>Checker</option>
<option value='2'>Bump</option>
<option value='3'>Bump With Texture</option>
<option value='4'>Texture Only</option>
<option value='5'>Texture with Color Multiplier</option>
<option value='6'>Tangent</option>
<option value='7'>Binormal</option>
<option value='8'>Normal</option>
<option value='9'>Solid Color</option>
<option value='10'>Vertex Color</option>
<option value='11'>Blinn-Phong with Color Multiplier</option>
</select>
</body>
</html>
(C) Æliens
20/2/2008
You may not copy or print any of this material without explicit permission of the author or the publisher.
In case of other copyright issues, contact the author.
