1 files changed, 111 insertions, 0 deletions
diff --git a/Runtime/Audio/AudioLowPassFilter.cpp b/Runtime/Audio/AudioLowPassFilter.cpp
new file mode 100644
index 0000000..091405f
--- /dev/null
+++ b/Runtime/Audio/AudioLowPassFilter.cpp
@@ -0,0 +1,111 @@
+#include "UnityPrefix.h"
+#include "AudioLowPassFilter.h"
+#include "Runtime/Utilities/Utility.h"
+
+#if ENABLE_AUDIO_FMOD
+
+AudioLowPassFilter::AudioLowPassFilter (MemLabelId label, ObjectCreationMode mode) :
+Super(label, mode),
+m_CutoffFrequency(5000.0f),
+m_LowpassResonanceQ(1.0f),
+m_NeedToNormalizeCurve(false)
+{
+	m_Type = FMOD_DSP_TYPE_LOWPASS;
+}
+
+AudioLowPassFilter::~AudioLowPassFilter()
+{}
+
+void AudioLowPassFilter::AwakeFromLoad (AwakeFromLoadMode awakeMode)
+{
+	Super::AwakeFromLoad (awakeMode);
+	
+	if (m_NeedToNormalizeCurve)
+	{
+		AudioSource* source = QueryComponent(AudioSource);
+		if (source)
+			ScaleCurveTime(m_LowpassLevelCustomCurve, 1 / source->GetMaxDistance());
+	}
+}
+
+void AudioLowPassFilter::Reset()
+{
+	Super::Reset();
+	
+	m_CutoffFrequency = 5000.0f;
+	m_LowpassResonanceQ = 1.0f;
+	m_NeedToNormalizeCurve = false;
+	
+	// Curve initial values will be handled in CheckConsistency
+	m_LowpassLevelCustomCurve.ResizeUninitialized (0);
+	CheckConsistency ();
+}
+
+void AudioLowPassFilter::AddToManager()
+{
+	Super::AddToManager();
+}
+
+void AudioLowPassFilter::CheckConsistency()
+{
+	Super::CheckConsistency();
+	// @TODO get output freq from audiomanager
+	m_CutoffFrequency = clamp(m_CutoffFrequency, 10.0f, 22000.0f);
+	m_LowpassResonanceQ = clamp(m_LowpassResonanceQ, 1.0f, 10.0f);
+	
+	if (m_LowpassLevelCustomCurve.GetKeyCount() < 1)
+		m_LowpassLevelCustomCurve.AddKey(AnimationCurve::Keyframe(0.0f, 1 - m_CutoffFrequency / 22000.0f));
+}
+
+void AudioLowPassFilter::Update()
+{
+	if (m_DSP)
+	{
+		m_DSP->setParameter(FMOD_DSP_LOWPASS_CUTOFF, m_CutoffFrequency);
+		m_DSP->setParameter(FMOD_DSP_LOWPASS_RESONANCE, m_LowpassResonanceQ);
+	}
+}
+/// Set/Get spread curve
+AnimationCurve& AudioLowPassFilter::GetCustomLowpassLevelCurve ()
+{
+	return m_LowpassLevelCustomCurve;
+}
+
+
+const AnimationCurve& AudioLowPassFilter::GetCustomLowpassLevelCurve () const
+{
+	return m_LowpassLevelCustomCurve;
+}
+
+void AudioLowPassFilter::SetCustomLowpassLevelCurve(const AnimationCurve& curve)
+{
+	m_LowpassLevelCustomCurve = curve;
+	SetDirty();
+}
+
+
+template<class TransferFunc>
+void AudioLowPassFilter::Transfer (TransferFunc& transfer)
+{
+	Super::Transfer (transfer);
+	
+	// 3.5  3: Normalized curve values
+	// <3.5	2: Non-Normalized curves
+	transfer.SetVersion (3);
+	
+	TRANSFER(m_CutoffFrequency);
+	TRANSFER(m_LowpassResonanceQ);
+	
+	transfer.Transfer(m_LowpassLevelCustomCurve, "lowpassLevelCustomCurve");
+	
+	if (transfer.IsVersionSmallerOrEqual(2))
+	{
+		m_NeedToNormalizeCurve = true;
+	}	
+}
+
+
+IMPLEMENT_CLASS (AudioLowPassFilter)
+IMPLEMENT_OBJECT_SERIALIZE (AudioLowPassFilter)
+
+#endif //ENABLE_AUDIO
+\ No newline at end of file