1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef Distance_h 30 #define Distance_h 31 32 namespace WebCore { 33 34 // Distance models are defined according to the OpenAL specification 35 36 class DistanceEffect { 37 public: 38 enum ModelType { 39 ModelLinear = 0, 40 ModelInverse = 1, 41 ModelExponential = 2 42 }; 43 44 DistanceEffect(); 45 46 // Returns scalar gain for the given distance the current distance model is used 47 double gain(double distance); 48 model()49 ModelType model() { return m_model; } 50 setModel(ModelType model,bool clamped)51 void setModel(ModelType model, bool clamped) 52 { 53 m_model = model; 54 m_isClamped = clamped; 55 } 56 57 // Distance params setRefDistance(double refDistance)58 void setRefDistance(double refDistance) { m_refDistance = refDistance; } setMaxDistance(double maxDistance)59 void setMaxDistance(double maxDistance) { m_maxDistance = maxDistance; } setRolloffFactor(double rolloffFactor)60 void setRolloffFactor(double rolloffFactor) { m_rolloffFactor = rolloffFactor; } 61 refDistance()62 double refDistance() const { return m_refDistance; } maxDistance()63 double maxDistance() const { return m_maxDistance; } rolloffFactor()64 double rolloffFactor() const { return m_rolloffFactor; } 65 66 protected: 67 double linearGain(double distance); 68 double inverseGain(double distance); 69 double exponentialGain(double distance); 70 71 ModelType m_model; 72 bool m_isClamped; 73 double m_refDistance; 74 double m_maxDistance; 75 double m_rolloffFactor; 76 }; 77 78 } // namespace WebCore 79 80 #endif // Distance_h 81