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| 1 <!-- |
| 2 Copyright 2010, Google Inc. |
| 3 All rights reserved. |
| 4 |
| 5 Redistribution and use in source and binary forms, with or without |
| 6 modification, are permitted provided that the following conditions are |
| 7 met: |
| 8 |
| 9 * Redistributions of source code must retain the above copyright |
| 10 notice, this list of conditions and the following disclaimer. |
| 11 * Redistributions in binary form must reproduce the above |
| 12 copyright notice, this list of conditions and the following disclaimer |
| 13 in the documentation and/or other materials provided with the |
| 14 distribution. |
| 15 * Neither the name of Google Inc. nor the names of its |
| 16 contributors may be used to endorse or promote products derived from |
| 17 this software without specific prior written permission. |
| 18 |
| 19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 23 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 24 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 25 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 26 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 27 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 --> |
| 31 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" |
| 32 "http://www.w3.org/TR/html4/loose.dtd"> |
| 33 <html> |
| 34 <head> |
| 35 <meta http-equiv="content-type" content="text/html; charset=UTF-8"> |
| 36 <title> |
| 37 Picking and IndexBuffers |
| 38 </title> |
| 39 <script type="text/javascript" src="../o3d-webgl/base.js"></script> |
| 40 <script type="text/javascript" src="../o3djs/base.js"></script> |
| 41 <script type="text/javascript" id="o3dscript"> |
| 42 o3djs.base.o3d = o3d; |
| 43 o3djs.require('o3djs.webgl'); |
| 44 o3djs.require('o3djs.math'); |
| 45 o3djs.require('o3djs.rendergraph'); |
| 46 o3djs.require('o3djs.primitives'); |
| 47 o3djs.require('o3djs.material'); |
| 48 o3djs.require('o3djs.picking'); |
| 49 |
| 50 // global variables |
| 51 var g_o3dElement; |
| 52 var g_client; |
| 53 var g_o3d; |
| 54 var g_math; |
| 55 var g_pack; |
| 56 var g_viewInfo; |
| 57 var g_eyePosition = [0, 0, 10]; |
| 58 var g_dataroot; |
| 59 var g_pickManager; |
| 60 |
| 61 /** |
| 62 * Creates the client area. |
| 63 */ |
| 64 function initClient() { |
| 65 window.g_finished = false; // for selenium testing. |
| 66 o3djs.webgl.makeClients(main); |
| 67 } |
| 68 |
| 69 /** |
| 70 * Updates the span with the name of the shape that was picked, if anything. |
| 71 * @param {event} e |
| 72 */ |
| 73 function pick(e) { |
| 74 var worldRay = o3djs.picking.clientPositionToWorldRay( |
| 75 e.x, |
| 76 e.y, |
| 77 g_viewInfo.drawContext, |
| 78 g_client.width, |
| 79 g_client.height); |
| 80 var pickInfo = g_pickManager.pick(worldRay); |
| 81 var picked = 'nothing'; |
| 82 if (pickInfo) { |
| 83 picked = pickInfo.shapeInfo.shape.name; |
| 84 } |
| 85 document.getElementById('picked').innerHTML = picked; |
| 86 } |
| 87 |
| 88 /** |
| 89 * Rotates the scene if key is one of 'wasd'. |
| 90 * @param {event} event |
| 91 */ |
| 92 function rotateScene(event) { |
| 93 // Ignore accelerator key messages. |
| 94 if (event.metaKey) |
| 95 return; |
| 96 |
| 97 var keyChar = String.fromCharCode(o3djs.event.getEventKeyChar(event)); |
| 98 // Just in case they have capslock on. |
| 99 keyChar = keyChar.toLowerCase(); |
| 100 |
| 101 var actionTaken = false; |
| 102 var delta = 0.1; |
| 103 switch(keyChar) { |
| 104 case 'a': |
| 105 g_dataroot.localMatrix = |
| 106 g_math.matrix4.mul(g_dataroot.localMatrix, |
| 107 g_math.matrix4.rotationY(-delta)); |
| 108 actionTaken = true; |
| 109 break; |
| 110 case 'd': |
| 111 g_dataroot.localMatrix = |
| 112 g_math.matrix4.mul(g_dataroot.localMatrix, |
| 113 g_math.matrix4.rotationY(delta)); |
| 114 actionTaken = true; |
| 115 break; |
| 116 case 'w': |
| 117 g_dataroot.localMatrix = |
| 118 g_math.matrix4.mul(g_dataroot.localMatrix, |
| 119 g_math.matrix4.rotationX(-delta)); |
| 120 actionTaken = true; |
| 121 break; |
| 122 case 's': |
| 123 g_dataroot.localMatrix = |
| 124 g_math.matrix4.mul(g_dataroot.localMatrix, |
| 125 g_math.matrix4.rotationX(delta)); |
| 126 actionTaken = true; |
| 127 break; |
| 128 } |
| 129 if (actionTaken) { |
| 130 g_pickManager.update(); |
| 131 } |
| 132 } |
| 133 |
| 134 /** |
| 135 * Initializes global variables, positions camera, draws shapes. |
| 136 * @param {Array} clientElements Array of o3d object elements. |
| 137 */ |
| 138 function main(clientElements) { |
| 139 // Init global variables. |
| 140 initGlobals(clientElements); |
| 141 |
| 142 // Set up the view and projection transformations. |
| 143 initContext(); |
| 144 |
| 145 // Add the shapes to the transform heirarchy. |
| 146 createShapes(); |
| 147 |
| 148 o3djs.event.addEventListener(g_o3dElement, 'mousedown', pick); |
| 149 o3djs.event.addEventListener(g_o3dElement, 'keypress', rotateScene); |
| 150 |
| 151 // Create the pick manager. |
| 152 g_pickManager = o3djs.picking.createPickManager(g_client.root); |
| 153 g_pickManager.update(); |
| 154 |
| 155 window.g_finished = true; // for selenium testing. |
| 156 } |
| 157 |
| 158 /** |
| 159 * Initializes global variables and libraries. |
| 160 */ |
| 161 function initGlobals(clientElements) { |
| 162 g_o3dElement = clientElements[0]; |
| 163 window.g_client = g_client = g_o3dElement.client; |
| 164 g_o3d = g_o3dElement.o3d; |
| 165 g_math = o3djs.math; |
| 166 |
| 167 // Create a pack to manage the objects created. |
| 168 g_pack = g_client.createPack(); |
| 169 |
| 170 // Creates a transform to put our data on. |
| 171 g_dataroot = g_pack.createObject('Transform'); |
| 172 g_dataroot.parent = g_client.root; |
| 173 g_dataroot.rotateY(-0.3); |
| 174 |
| 175 // Create the render graph for a view. |
| 176 g_viewInfo = o3djs.rendergraph.createBasicView( |
| 177 g_pack, |
| 178 g_client.root, |
| 179 g_client.renderGraphRoot); |
| 180 } |
| 181 /** |
| 182 * Sets up reasonable view and projection matrices. |
| 183 */ |
| 184 function initContext() { |
| 185 // Set up a perspective transformation for the projection. |
| 186 g_viewInfo.drawContext.projection = g_math.matrix4.perspective( |
| 187 g_math.degToRad(30), // 30 degree frustum. |
| 188 g_o3dElement.clientWidth / g_o3dElement.clientHeight, // Aspect ratio. |
| 189 1, // Near plane. |
| 190 5000); // Far plane. |
| 191 |
| 192 // Set up our view transformation to look towards the world origin where the |
| 193 // primitives are located. |
| 194 g_viewInfo.drawContext.view = g_math.matrix4.lookAt( |
| 195 g_eyePosition, // eye |
| 196 [0, 0, 0], // target |
| 197 [0, 1, 0]); // up |
| 198 } |
| 199 |
| 200 /** |
| 201 * Creates shapes using the primitives utility library, and adds them to the |
| 202 * transform graph at the root node. |
| 203 */ |
| 204 function createShapes() { |
| 205 var triangleFan = createShape(g_o3d.Primitive.TRIANGLEFAN); |
| 206 triangleFan.name = 'triangle-fan'; |
| 207 var triangleStrip = createShape(g_o3d.Primitive.TRIANGLESTRIP); |
| 208 triangleStrip.name = 'triangle-strip'; |
| 209 var triangleList = createShape(g_o3d.Primitive.TRIANGLELIST); |
| 210 triangleList.name = 'triangle-list'; |
| 211 var noIndexBuffer = createShape(-1); |
| 212 noIndexBuffer.name = 'bufferless'; |
| 213 |
| 214 // Add the shapes to the transforms. |
| 215 var transformTable = [ |
| 216 {shape: noIndexBuffer, translation: [-0.5, 1.25, 0]}, |
| 217 {shape: triangleFan, translation: [-1.0, -1.0, 0]}, |
| 218 {shape: triangleStrip, translation: [1.0, -1.0, 0]}, |
| 219 {shape: triangleList, translation: [0, 0, 0]} |
| 220 ]; |
| 221 |
| 222 for (var tt = 0; tt < transformTable.length; ++tt) { |
| 223 var transform = g_pack.createObject('Transform'); |
| 224 transform.addShape(transformTable[tt].shape); |
| 225 transform.translate(transformTable[tt].translation); |
| 226 transform.parent = g_dataroot; |
| 227 } |
| 228 } |
| 229 |
| 230 /** |
| 231 * Creates a shape that uses the requested indexing type. |
| 232 * @param {o3d.Primitive.Type} indexType |
| 233 */ |
| 234 function createShape(indexType) { |
| 235 var material = g_pack.createObject('Material'); |
| 236 var effect = g_pack.createObject('Effect'); |
| 237 var shaderString = document.getElementById('shader').value; |
| 238 effect.loadFromFXString(shaderString); |
| 239 material.effect = effect; |
| 240 material.drawList = g_viewInfo.performanceDrawList; |
| 241 effect.createUniformParameters(material); |
| 242 |
| 243 var shape = g_pack.createObject('Shape'); |
| 244 var primitive = g_pack.createObject('Primitive'); |
| 245 var streamBank = g_pack.createObject('StreamBank'); |
| 246 |
| 247 primitive.material = material; |
| 248 primitive.owner = shape; |
| 249 primitive.streamBank = streamBank; |
| 250 primitive.primitiveType = indexType; |
| 251 primitive.createDrawElement(g_pack, null); |
| 252 |
| 253 var positionArray = []; |
| 254 |
| 255 switch (indexType) { |
| 256 case g_o3d.Primitive.TRIANGLEFAN: |
| 257 positionArray = [ |
| 258 0.5, 0.0, 0.5, // 0 |
| 259 0.5, 0.0, -0.5, // 1 |
| 260 -0.5, 0.0, -0.5, // 2 |
| 261 -0.5, 0.0, 0.5, // 3 |
| 262 0.0, -1.0, 0.0 // 4 |
| 263 ]; |
| 264 indices = [4, 3, 2, 1, 0, 3]; // Square pyramid w/o the bottom. |
| 265 primitive.numberPrimitives = 4; |
| 266 primitive.numberVertices = 5; |
| 267 break; |
| 268 case g_o3d.Primitive.TRIANGLESTRIP: |
| 269 positionArray = [ |
| 270 0.0, 0.0, 0.0, // 0 |
| 271 1.0, 0.0, 0.0, // 1 |
| 272 0.5, 0.0, -0.866, // 2 |
| 273 0.5, 0.866, -0.433 // 3 |
| 274 ]; |
| 275 indices = [0, 1, 3, 2, 0, 1]; // Triangular pyramid sort of shape. |
| 276 primitive.numberPrimitives = 4; |
| 277 primitive.numberVertices = 4; |
| 278 break; |
| 279 case g_o3d.Primitive.TRIANGLELIST: |
| 280 positionArray = [ |
| 281 -0.5, -0.5, 0.5, // vertex 0 |
| 282 0.5, -0.5, 0.5, // vertex 1 |
| 283 -0.5, 0.5, 0.5, // vertex 2 |
| 284 0.5, 0.5, 0.5, // vertex 3 |
| 285 -0.5, 0.5, -0.5, // vertex 4 |
| 286 0.5, 0.5, -0.5, // vertex 5 |
| 287 -0.5, -0.5, -0.5, // vertex 6 |
| 288 0.5, -0.5, -0.5 // vertex 7 |
| 289 ]; |
| 290 indices = [ |
| 291 0, 1, 2, // face 1 |
| 292 2, 1, 3, |
| 293 2, 3, 4, // face 2 |
| 294 4, 3, 5, |
| 295 4, 5, 6, // face 3 |
| 296 6, 5, 7, |
| 297 6, 7, 0, // face 4 |
| 298 0, 7, 1, |
| 299 1, 7, 3, // face 5 |
| 300 3, 7, 5, |
| 301 6, 0, 4, // face 6 |
| 302 4, 0, 2 |
| 303 ]; |
| 304 primitive.numberPrimitives = 12; |
| 305 primitive.numberVertices = 8; |
| 306 break; |
| 307 default: |
| 308 // No index buffer. Vertex data contains triples of triangles. |
| 309 positionArray = [ |
| 310 -0.5, -0.5, 0.5, |
| 311 0.5, -0.5, 0.5, |
| 312 -0.5, 0.5, 0.5, |
| 313 0.5, -0.5, 0.5, |
| 314 1.5, -0.5, 0.5, // vertex 1 |
| 315 1.5, 0.5, 0.5 // vertex 3 |
| 316 ]; |
| 317 indices = null; |
| 318 primitive.numberPrimitives = 2; |
| 319 primitive.numberVertices = 6; |
| 320 break; |
| 321 } |
| 322 |
| 323 // Create buffers containing the vertex data. |
| 324 var positionsBuffer = g_pack.createObject('VertexBuffer'); |
| 325 var positionsField = positionsBuffer.createField('FloatField', 3); |
| 326 positionsBuffer.set(positionArray); |
| 327 |
| 328 if (indices) { |
| 329 var indexBuffer = g_pack.createObject('IndexBuffer'); |
| 330 indexBuffer.set(indices); |
| 331 primitive.indexBuffer = indexBuffer; |
| 332 } |
| 333 |
| 334 // Associate the positions Buffer with the StreamBank. |
| 335 streamBank.setVertexStream( |
| 336 g_o3d.Stream.POSITION, // semantic: This stream stores vertex positions |
| 337 0, // semantic index: First (and only) position stream |
| 338 positionsField, // field: the field this stream uses. |
| 339 0); // start_index: How many elements to skip in the |
| 340 // field. |
| 341 return shape; |
| 342 } |
| 343 </script> |
| 344 </head> |
| 345 <body onload="initClient()"> |
| 346 <h1>More Picking</h1> |
| 347 <p>This example demonstrates picking with custom shapes that use a variety of |
| 348 index buffer formats. Back faces are culled (hidden) and cannot be picked.</p> |
| 349 <p> |
| 350 You picked: <span id="picked" style="color: red;">nothing</span> |
| 351 </p> |
| 352 <p>Rotate in the scene with WASD.</p> |
| 353 <br/> |
| 354 <!-- Start of O3D plugin --> |
| 355 <div id="o3d" style="width: 600px; height: 600px;"></div> |
| 356 <!-- End of O3D plugin --> |
| 357 |
| 358 <textarea id="shader" style="display: none;"> |
| 359 attribute vec4 position; |
| 360 uniform mat4 worldViewProjection; |
| 361 varying vec4 pos; |
| 362 |
| 363 /** |
| 364 * The vertex shader simply transforms the input vertices to screen space. |
| 365 */ |
| 366 void main() { |
| 367 // Multiply the vertex positions by the worldViewProjection matrix to |
| 368 // transform them to screen space. |
| 369 gl_Position = worldViewProjection * position; |
| 370 pos = position; |
| 371 } |
| 372 |
| 373 // #o3d SplitMarker |
| 374 varying vec4 pos; |
| 375 |
| 376 /** |
| 377 * The fragment shader derives color based on the position. |
| 378 */ |
| 379 void main() { |
| 380 gl_FragColor = vec4(pos.xyz, 1.0); |
| 381 } |
| 382 </textarea> |
| 383 </body> |
| 384 </html> |
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Chromium Code Reviews
Issue 2805101:
o3d-webgl: Adding support for triangle fan/strip in picking. (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/o3d/