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authorgspencer@google.com <gspencer@google.com@0039d316-1c4b-4281-b951-d872f2087c98>2009-05-27 23:15:42 +0000
committergspencer@google.com <gspencer@google.com@0039d316-1c4b-4281-b951-d872f2087c98>2009-05-27 23:15:42 +0000
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parent5cdc8bdb4c847cefe7f4542bd10c9880c2c557a0 (diff)
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This is the O3D source tree's initial commit to the Chromium tree. It
is not built or referenced at all by the chrome build yet, and doesn't yet build in it's new home. We'll change that shortly. git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17035 0039d316-1c4b-4281-b951-d872f2087c98
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+<!--
+Copyright 2009, Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+ * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+ * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-->
+
+<!--
+O3D Tutorial
+
+In this tutorial, we load and display a scene in O3D and then
+apply a procedural texture 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>
+Applying a Procedural Texture to a scene
+</title>
+<!-- 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.camera');
+o3djs.require('o3djs.scene');
+
+// Events
+// init() once the page has finished loading.
+window.onload = init;
+
+// global variables
+var g_o3d;
+var g_client;
+var g_viewInfo;
+var g_pack;
+var g_finished = false; // for selenium testing
+
+/**
+ * Loads a scene into the transform graph.
+ * @param {!o3d.Pack} pack Pack to load scene into.
+ * @param {string} fileName filename of the scene.
+ * @param {!o3d.Transform} parent parent node in the transform graph to
+ * which to load the scene into.
+ */
+function loadScene(pack, fileName, parent) {
+ // Get our full path to the scene
+ var scenePath = o3djs.util.getCurrentURI() + fileName;
+
+ // Load the file given the full path, and call the callback function
+ // when its done loading.
+ o3djs.scene.loadScene(g_client, pack, parent, scenePath, callback);
+
+ /**
+ * Our callback is called once the scene has been loaded into memory
+ * from the web or locally.
+ * @param {!o3d.Pack} pack The pack that was passed in above.
+ * @param {!o3d.Transform} parent The parent that was passed in above.
+ * @param {*} exception null if loading succeeded.
+ */
+ function callback(pack, parent, exception) {
+ if (exception) {
+ alert('Could not load: ' + fileName + '\n' + exception);
+ return;
+ }
+ // Get a CameraInfo (an object with a view and projection matrix)
+ // using our javascript library function
+ var cameraInfo = o3djs.camera.getViewAndProjectionFromCameras(
+ parent,
+ g_client.width,
+ g_client.height);
+
+ // Copy the view and projection to the draw context.
+ g_viewInfo.drawContext.view = cameraInfo.view;
+ g_viewInfo.drawContext.projection = cameraInfo.projection;
+
+ // Add our checker pattern
+ createCheckerBoard(pack, 'Material__26');
+
+ // Generate draw elements and setup material draw lists.
+ o3djs.pack.preparePack(pack, g_viewInfo);
+
+ g_finished = true; // for selenium testing.
+ }
+}
+
+/**
+ * In order to apply the texture you must know the material name which you wish
+ * to change. The bulk of the calculation takes place in the shader itself.
+ * Alternatively, you could change the first or all the materials if you don't
+ * know the material name.
+ * @param {!o3d.Pack} pack The pack the scene was loaded into.
+ * @param {string} materialName Name of material you wish to turn into checkers.
+ */
+function createCheckerBoard(pack, materialName) {
+ var effectString = document.getElementById('checkerShader').value;
+ var effect = g_pack.createObject('Effect');
+ effect.loadFromFXString(effectString);
+ var materials = pack.getObjects(materialName, 'o3d.Material');
+ for (var m = 0; m < materials.length; m++) {
+ var material = materials[m];
+ // Set the material to use the checker effect.
+ material.effect = effect;
+ // Create any parameters the effect needs on the material.
+ effect.createUniformParameters(material);
+ }
+}
+
+/**
+ * Creates the client area.
+ */
+function init() {
+ o3djs.util.makeClients(initStep2);
+}
+
+/**
+ * Initializes O3D and loads the scene into the transform graph.
+ * @param {Array} clientElements Array of o3d object elements.
+ */
+function initStep2(clientElements) {
+ // Initializes global variables and libraries.
+ var o3dElement = clientElements[0];
+ g_o3d = o3dElement.o3d;
+ g_client = o3dElement.client;
+
+ // 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.
+ var myDataRoot = g_pack.createObject('Transform');
+
+ // Connects our root to the client's root.
+ myDataRoot.parent = g_client.root;
+
+ // Load the scene into the transform graph as a child myDataRoot
+ loadScene(g_pack, 'assets/teapot.o3dtgz', myDataRoot);
+}
+</script>
+</head>
+<body>
+<h1>Applying a Procedural Texture to a scene</h1>
+This tutorial shows how to apply a procedural texture to a scene.
+<br/>
+<!-- Start of O3D plugin -->
+<div id="o3d" style="width: 600px; height: 600px;"></div>
+<!-- End of O3D plugin -->
+<!-- Don't render the textarea -->
+<div style="display:none">
+<textarea id="checkerShader" name="checkerShader" cols="80" rows="20">
+ // The 4x4 world view projection matrix.
+ float4x4 worldViewProjection : WORLDVIEWPROJECTION;
+
+ // input parameters for our vertex shader
+ struct a2v {
+ float4 position : POSITION;
+ float3 normal : NORMAL;
+ float2 texcoord : TEXCOORD0;
+ };
+
+ // input parameters for our pixel shader
+ struct v2f {
+ float4 position : POSITION;
+ float4 col : COLOR;
+ float2 texcoord : TEXCOORD0;
+ };
+
+ // function for getting the checker pattern
+ float4 checker(float2 uv) {
+ float checkSize = 4;
+ float fmodResult = fmod(floor(checkSize * uv.x) + floor(checkSize * uv.y),
+ 2.0);
+ if (fmodResult < 1) {
+ return float4(0, 1, 1, 1);
+ } else {
+ return float4(1, 0, 1, 1);
+ }
+ }
+
+ /**
+ * Our vertex shader. In the vertex shader, we calculate the lighting.
+ * Then we'll combine it with our checker pattern in the pixel shader.
+ */
+ v2f vertexShaderFunction(a2v input) {
+ v2f output;
+ output.position = mul(input.position, worldViewProjection);
+ /**
+ * lightVector - light vector
+ * normal - normal vector
+ * We put the light such that it illuminates our model.
+ */
+
+ float4 diffuseColor = float4(1, 1, 1, 1);
+ float3 lightPos = float3(1000, -1000, 1000);
+
+ float3 lightVector = normalize(lightPos - input.position.xyz);
+ float3 normal = normalize(input.normal);
+ float4 diffuse = dot(normal, lightVector) * diffuseColor;
+
+ output.col = diffuse;
+ output.texcoord = input.texcoord;
+ return output;
+ }
+
+ /**
+ * Our pixel shader. We take the lighting color we got from the vertex sahder
+ * and combine it with our checker pattern.
+ */
+ float4 pixelShaderFunction(v2f input): COLOR {
+ float4 check = checker(input.texcoord);
+ float4 color = input.col * check;
+ return color;
+ }
+
+ // Here we tell our effect file *which* functions are
+ // our vertex and pixel shaders.
+
+ // #o3d VertexShaderEntryPoint vertexShaderFunction
+ // #o3d PixelShaderEntryPoint pixelShaderFunction
+ // #o3d MatrixLoadOrder RowMajor
+</textarea>
+</div>
+</body>
+</html>
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