15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2010 Google Inc. All rights reserved. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * are met: 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 1. Redistributions of source code must retain the above copyright 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer. 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 2. Redistributions in binary form must reproduce the above copyright 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer in the 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * documentation and/or other materials provided with the distribution. 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * its contributors may be used to endorse or promote products derived 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * from this software without specific prior written permission. 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#include "config.h" 305c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#if ENABLE(WEB_AUDIO) 325c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 331e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/audio/Cone.h" 347757ec2eadfa2dd8ac2aeed0a4399e9b07ec38cbBen Murdoch#include "wtf/MathExtras.h" 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 36c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)namespace blink { 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)ConeEffect::ConeEffect() 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) : m_innerAngle(360.0) 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_outerAngle(360.0) 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) , m_outerGain(0.0) 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)double ConeEffect::gain(FloatPoint3D sourcePosition, FloatPoint3D sourceOrientation, FloatPoint3D listenerPosition) 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles){ 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (sourceOrientation.isZero() || ((m_innerAngle == 360.0) && (m_outerAngle == 360.0))) 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return 1.0; // no cone specified - unity gain 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 505c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Normalized source-listener vector 515c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) FloatPoint3D sourceToListener = listenerPosition - sourcePosition; 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) sourceToListener.normalize(); 535c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 545c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) FloatPoint3D normalizedSourceOrientation = sourceOrientation; 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) normalizedSourceOrientation.normalize(); 565c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 575c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Angle between the source orientation vector and the source-listener vector 585c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double dotProduct = sourceToListener.dot(normalizedSourceOrientation); 595c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double angle = 180.0 * acos(dotProduct) / piDouble; 605c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double absAngle = fabs(angle); 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Divide by 2.0 here since API is entire angle (not half-angle) 635c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double absInnerAngle = fabs(m_innerAngle) / 2.0; 645c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double absOuterAngle = fabs(m_outerAngle) / 2.0; 655c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double gain = 1.0; 665c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 675c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) if (absAngle <= absInnerAngle) 685c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // No attenuation 695c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) gain = 1.0; 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else if (absAngle >= absOuterAngle) 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Max attenuation 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) gain = m_outerGain; 735c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) else { 745c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // Between inner and outer cones 755c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) // inner -> outer, x goes from 0 -> 1 765c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) double x = (absAngle - absInnerAngle) / (absOuterAngle - absInnerAngle); 775c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) gain = (1.0 - x) + m_outerGain * x; 785c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) } 795c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 805c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) return gain; 815c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 825c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 83c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles)} // namespace blink 845c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 855c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif // ENABLE(WEB_AUDIO) 86