1 files changed, 209 insertions, 0 deletions

diff --git a/src/audio/oal/channel.cpp b/src/audio/oal/channel.cpp
new file mode 100644
index 00000000..d8b50161
--- /dev/null
+++ b/src/audio/oal/channel.cpp
@@ -0,0 +1,209 @@
+#include "channel.h"
+
+#ifdef AUDIO_OAL
+#include "sampman.h"
+
+extern bool IsFXSupported();
+
+CChannel::CChannel()
+{
+	alChannel = AL_NONE;
+	alFilter  = AL_FILTER_NULL;
+	SetDefault();
+}
+
+void CChannel::SetDefault()
+{
+	Buffer = AL_NONE;
+
+	Pitch = 1.0f;
+	Gain = 1.0f;
+	Mix = 0.0f;
+		
+	Position[0] = 0.0f; Position[1] = 0.0f; Position[2] = 0.0f;
+	Distances[0] = 0.0f; Distances[1] = FLT_MAX;
+	LoopCount  = 1;
+	LoopPoints[0] = 0; LoopPoints[1] = -1;
+	
+	Frequency = MAX_FREQ;
+}
+
+void CChannel::Reset()
+{
+	ClearBuffer();
+	SetDefault();
+}
+
+void CChannel::Init(bool Is2D)
+{
+	ASSERT(!HasSource());
+	alGenSources(1, &alChannel);
+	if ( HasSource() )
+	{
+		alSourcei(alChannel, AL_SOURCE_RELATIVE, AL_TRUE);
+		if ( IsFXSupported() )
+			alSource3i(alChannel, AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, AL_FILTER_NULL);
+		
+		if ( Is2D )
+		{
+			alSource3f(alChannel, AL_POSITION, 0.0f, 0.0f, 0.0f);
+			alSourcef (alChannel, AL_GAIN, 1.0f);
+		}
+		else
+		{
+			if ( IsFXSupported() )
+				alGenFilters(1,&alFilter);
+		}
+	}
+}
+
+void CChannel::Term()
+{
+	Stop();
+	if ( HasSource() )
+	{
+		if ( IsFXSupported() )
+		{
+			alSource3i(alChannel, AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, AL_FILTER_NULL);
+			
+			if(alFilter != AL_FILTER_NULL)
+				alDeleteFilters(1,&alFilter);
+		}
+
+		alDeleteSources(1, &alChannel);
+	}
+	alChannel = AL_NONE;
+	alFilter = AL_FILTER_NULL;
+}
+
+void CChannel::Start()
+{
+	if ( !HasSource() ) return;
+	
+	if ( LoopPoints[0] != 0 && LoopPoints[0] != -1 )
+		alBufferiv(Buffer, AL_LOOP_POINTS_SOFT, LoopPoints);
+	alSourcei   (alChannel, AL_BUFFER, Buffer);
+	alSourcePlay(alChannel);
+}
+
+void CChannel::Stop()
+{
+	if ( HasSource() )
+		alSourceStop(alChannel);
+	
+	Reset();
+}
+
+bool CChannel::HasSource()
+{
+	return alChannel != AL_NONE;
+}
+	
+bool CChannel::IsUsed()
+{
+	if ( HasSource() )
+	{
+		ALint sourceState;
+		alGetSourcei(alChannel, AL_SOURCE_STATE, &sourceState);
+		return sourceState == AL_PLAYING;
+	}
+	return false;
+}
+
+void CChannel::SetPitch(float pitch)
+{
+	if ( !HasSource() ) return;
+	alSourcef(alChannel, AL_PITCH, pitch);
+}
+
+void CChannel::SetGain(float gain)
+{
+	if ( !HasSource() ) return;
+	alSourcef(alChannel, AL_GAIN, gain);
+}
+	
+void CChannel::SetVolume(int32 vol)
+{
+	SetGain(ALfloat(vol) / MAX_VOLUME);
+}
+	
+void CChannel::SetSampleID(uint32 nSfx)
+{
+	Sample = nSfx;
+}
+	
+void CChannel::SetFreq(int32 freq)
+{
+	Frequency = freq;
+}
+	
+void CChannel::SetCurrentFreq(uint32 freq)
+{
+	SetPitch(ALfloat(freq) / Frequency);
+}
+
+void CChannel::SetLoopCount(int32 loopCount) // fake. TODO:
+{
+	if ( !HasSource() ) return;
+	alSourcei(alChannel, AL_LOOPING, loopCount == 1 ? AL_FALSE : AL_TRUE);
+}
+
+void CChannel::SetLoopPoints(ALint start, ALint end)
+{
+	LoopPoints[0] = start;
+	LoopPoints[1] = end;
+}
+	
+void CChannel::SetPosition(float x, float y, float z)
+{
+	if ( !HasSource() ) return;
+	alSource3f(alChannel, AL_POSITION, x, y, z);
+}
+	
+void CChannel::SetDistances(float max, float min)
+{
+	if ( !HasSource() ) return;
+	alSourcef   (alChannel, AL_MAX_DISTANCE,       max);
+	alSourcef   (alChannel, AL_REFERENCE_DISTANCE, min);
+	alSourcef   (alChannel, AL_MAX_GAIN, 1.0f);
+	alSourcef   (alChannel, AL_ROLLOFF_FACTOR, 1.0f);
+}
+	
+void CChannel::SetPan(uint32 pan)
+{
+	SetPosition((pan-63)/64.0f, 0.0f, sqrtf(1.0f-SQR((pan-63)/64.0f)));
+}
+
+void CChannel::SetBuffer(ALuint buffer)
+{
+	Buffer = buffer;
+}
+
+void CChannel::ClearBuffer()
+{
+	if ( !HasSource() ) return;
+	SetBuffer(AL_NONE);
+	alSourcei(alChannel, AL_BUFFER, AL_NONE);
+}
+
+void CChannel::SetReverbMix(ALuint slot, float mix)
+{
+	if ( !IsFXSupported() ) return;
+	if ( !HasSource() ) return;
+	if ( alFilter == AL_FILTER_NULL ) return;
+	
+	Mix = mix;
+	EAX3_SetReverbMix(alFilter, mix);
+	alSource3i(alChannel, AL_AUXILIARY_SEND_FILTER, slot, 0, alFilter);
+}
+
+void CChannel::UpdateReverb(ALuint slot)
+{
+	if ( !IsFXSupported() ) return;
+	if ( !HasSource() ) return;
+	if ( alFilter == AL_FILTER_NULL ) return;
+	EAX3_SetReverbMix(alFilter, Mix);
+	alSource3i(alChannel, AL_AUXILIARY_SEND_FILTER, slot, 0, alFilter);
+}
+
+#endif
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