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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/platform/audio/Cone.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/platform/audio/Cone.cpp')
-rw-r--r-- | Source/WebCore/platform/audio/Cone.cpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Source/WebCore/platform/audio/Cone.cpp b/Source/WebCore/platform/audio/Cone.cpp new file mode 100644 index 0000000..f514cde --- /dev/null +++ b/Source/WebCore/platform/audio/Cone.cpp @@ -0,0 +1,85 @@ +/* + * 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 "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) |