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<!--
This sample attempts to show what the error texture is, how to set it and
how turning it off will generate helpful error information.
-->
<html>
<head>
<title>Error Texture</title>
<script type="text/javascript" src="o3djs/base.js"></script>
<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.effect');
// Events
// Run the init() once the page has finished loading.
// and unload() when the page is unloaded.
window.onload = init;
window.onunload = unload;
// global variables
var g_o3d;
var g_math;
var g_client;
var g_pack;
var g_viewInfo;
var g_texture;
var g_errorMsgElement;
/**
* Creates the client area.
*/
function init() {
o3djs.util.makeClients(initStep2);
}
/**
* Initializes O3D, loads the effect, and sets up some quads.
* @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;
g_errorMsgElement =
document.getElementById('errorMsg');
// Turn of the error callback that o3djs.base.init setup.
g_client.clearErrorCallback();
// Let us render on demand.
g_client.renderMode = g_o3d.Client.RENDERMODE_ON_DEMAND;
// Create 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);
var clientWidth = g_client.width;
var clientHeight = g_client.height;
g_viewInfo.drawContext.projection = g_math.matrix4.orthographic(
-clientWidth * 0.5,
clientWidth * 0.5,
-clientHeight * 0.5,
clientHeight * 0.5,
0.001,
1000);
g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
[0, 500, 0], // eye
[0, 0, 0], // target
[0, 0, -1]); // up
// Create and load the effect.
var effect = g_pack.createObject('Effect');
o3djs.effect.loadEffect(effect, 'shaders/texture-only.shader');
// Create a Material for the effect.
var myMaterial = g_pack.createObject('Material');
// Set the material's drawList
myMaterial.drawList = g_viewInfo.zOrderedDrawList;
// Apply our effect to this material.
myMaterial.effect = effect;
// Creates a quad using the effect.
var shape = o3djs.primitives.createPlane(g_pack,
myMaterial,
1,
1,
1,
1);
var pixels = [];
for (var y = 0; y < 32; ++y) {
for (var x = 0; x < 32; ++x) {
var offset = (y * 32 + x) * 3; // rgb
var u = x / 32 * Math.PI * 0.5;
var v = y / 32 * Math.PI * 0.5;
pixels[offset + 0] = 0; // red
pixels[offset + 1] = Math.floor(y / 8) % 2; // green
pixels[offset + 2] = Math.floor(x / 8) % 2; // blue
}
}
var texture = g_pack.createTexture2D(32, 32, g_o3d.Texture.XRGB8, 1, false);
texture.set(0, pixels);
// display the quad 4 times with situations
// by overriding the sampler on each instance.
for (var s = 0; s < 4; ++s) {
// create a transform for an instance
var transform = g_pack.createObject('Transform');
transform.translate((s - 1.5) * 140, 0, 0);
transform.scale(128, 1, 128),
transform.parent = g_client.root;
transform.addShape(shape);
// case 0: Correct Texture.
// case 1: ParamSampler and Sampler but no Texture
// case 2: ParamSampler but no Sampler,
// case 3: No ParamSampler.
if (s <= 2) {
// Create a ParamSampler on the transform with the same name as in
// the effect so this param will be used instead of the one on the
// material.
var samplerParam = transform.createParam('texSampler0', 'ParamSampler');
if (s <= 1) {
var sampler = g_pack.createObject('Sampler');
sampler.name = "s2d";
samplerParam.value = sampler;
sampler.addressModeU = g_o3d.Sampler.CLAMP;
sampler.addressModeV = g_o3d.Sampler.CLAMP;
if (s == 0) {
sampler.texture = texture;
}
}
}
}
g_client.setPostRenderCallback(onRender);
// Render once now that things are setup.
render();
}
function setToUserTexture() {
var pixels = [];
for (var y = 0; y < 32; ++y) {
for (var x = 0; x < 32; ++x) {
var offset = (y * 32 + x) * 3; // rgb
var u = x / 32 * Math.PI * 0.5;
var v = y / 32 * Math.PI * 0.5;
pixels[offset + 0] = Math.cos(u); // red
pixels[offset + 1] = Math.sin(v); // green
pixels[offset + 2] = Math.sin(u); // blue
}
}
var texture = g_pack.createTexture2D(32, 32, g_o3d.Texture.XRGB8, 1, false);
texture.set(0, pixels);
g_client.setErrorTexture(texture);
// Render once now that things are setup.
render();
}
function setToNoTexture() {
g_client.setErrorTexture(null);
render();
}
function hide0() {
var child = g_client.root.children[1];
child.visible = !child.visible;
render();
}
function hide1() {
var child = g_client.root.children[2];
child.visible = !child.visible;
render();
}
function reportError(msg) {
g_errorMsgElement.innerHTML = g_client.lastError;
g_client.clearLastError();
g_client.clearErrorCallback();
}
function render() {
// Render once now that things are setup.
g_client.setErrorCallback(reportError);
g_client.render();
}
function onRender() {
}
/**
* Removes any callbacks so they don't get called after the page has unloaded.
*/
function unload() {
g_client.cleanup();
}
</script>
</head>
<body>
<h1>Error Texture.</h1>
<br/>
Demonstrates how missing textures are handled.
<div>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 800px; height: 600px;"></div>
<!-- End of O3D plugin -->
</div>
<br/>
<input type="button" value="User Texture" onClick="setToUserTexture()"/>
<input type="button" value="No Texture" onClick="setToNoTexture()"/>
<input type="button" value="hide 0" onClick="hide0()"/>
<input type="button" value="hide 1" onClick="hide1()"/>
<table><tr><td>Error: </td><td id="errorMsg">-</td></tr></table>
</html>