| /* |
| * Copyright (C) 2010 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: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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. |
| */ |
| |
| #include "config.h" |
| |
| #if ENABLE(WEB_AUDIO) |
| |
| #include "platform/audio/Cone.h" |
| #include "wtf/MathExtras.h" |
| |
| namespace WebCore { |
| |
| ConeEffect::ConeEffect() |
| : m_innerAngle(360.0) |
| , m_outerAngle(360.0) |
| , m_outerGain(0.0) |
| { |
| } |
| |
| double ConeEffect::gain(FloatPoint3D sourcePosition, FloatPoint3D sourceOrientation, FloatPoint3D listenerPosition) |
| { |
| if (sourceOrientation.isZero() || ((m_innerAngle == 360.0) && (m_outerAngle == 360.0))) |
| return 1.0; // no cone specified - unity gain |
| |
| // Normalized source-listener vector |
| FloatPoint3D sourceToListener = listenerPosition - sourcePosition; |
| sourceToListener.normalize(); |
| |
| FloatPoint3D normalizedSourceOrientation = sourceOrientation; |
| normalizedSourceOrientation.normalize(); |
| |
| // Angle between the source orientation vector and the source-listener vector |
| double dotProduct = sourceToListener.dot(normalizedSourceOrientation); |
| double angle = 180.0 * acos(dotProduct) / piDouble; |
| double absAngle = fabs(angle); |
| |
| // Divide by 2.0 here since API is entire angle (not half-angle) |
| double absInnerAngle = fabs(m_innerAngle) / 2.0; |
| double absOuterAngle = fabs(m_outerAngle) / 2.0; |
| double gain = 1.0; |
| |
| if (absAngle <= absInnerAngle) |
| // No attenuation |
| gain = 1.0; |
| else if (absAngle >= absOuterAngle) |
| // Max attenuation |
| gain = m_outerGain; |
| else { |
| // Between inner and outer cones |
| // inner -> outer, x goes from 0 -> 1 |
| double x = (absAngle - absInnerAngle) / (absOuterAngle - absInnerAngle); |
| gain = (1.0 - x) + m_outerGain * x; |
| } |
| |
| return gain; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |