Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

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
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+/*
+ * 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)