From 7fe4f1e60c84f9da020fd1236ff2a98f87231245 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Tue, 16 Dec 2008 11:24:05 +0000
Subject: [PATCH] experimental support for note panning in SF2 player (I'm not
 sure what m_maxChannels should be or how to find it out. I just picked what
 worked for my setup.)

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1941 0778d3d1-df1d-0410-868b-ea421aaaa00d
---
 include/note_play_handle.h        | 16 ++++++++++++++--
 plugins/sf2_player/sf2_player.cpp | 24 ++++++++++++++++++++----
 plugins/sf2_player/sf2_player.h   |  2 ++
 src/core/note_play_handle.cpp     |  1 +
 4 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/include/note_play_handle.h b/include/note_play_handle.h
index 903e409fd..e6560256c 100644
--- a/include/note_play_handle.h
+++ b/include/note_play_handle.h
@@ -56,7 +56,7 @@ public:
 	virtual ~notePlayHandle();
 
 	virtual void setVolume( const volume _volume = DefaultVolume );
-
+	
 	int getMidiVelocity( void ) const;
 
 	const float & frequency( void ) const
@@ -250,6 +250,15 @@ public:
 		m_patternIndex = _i;
 	}
 #endif
+	inline int channel( void ) const
+	{
+		return m_channel;
+	}
+	inline void setChannel( int _channel )
+	{
+		m_channel = _channel;
+	}
+
 
 
 private:
@@ -274,7 +283,7 @@ private:
 		float m_value;
 
 	} ;
-
+	
 
 	instrumentTrack * m_instrumentTrack;	// needed for calling
 					// instrumentTrack::playNote
@@ -300,6 +309,9 @@ private:
 #ifdef LMMS_SINGERBOT_SUPPORT
 	int m_patternIndex;		// position among relevant notes
 #endif
+	// which channel this note was played on
+	// needed for some plugins like SF2
+	int m_channel;
 
 	// tempo reaction
 	bpm_t m_origTempo;		// original tempo
diff --git a/plugins/sf2_player/sf2_player.cpp b/plugins/sf2_player/sf2_player.cpp
index 1589d24ab..2a34c2ce6 100644
--- a/plugins/sf2_player/sf2_player.cpp
+++ b/plugins/sf2_player/sf2_player.cpp
@@ -41,6 +41,7 @@
 #include "patches_dialog.h"
 #include "tooltip.h"
 #include "lcd_spinbox.h"
+#include "panning.h"
 
 #undef SINGLE_SOURCE_COMPILE
 #include "embed.cpp"
@@ -79,6 +80,8 @@ sf2Instrument::sf2Instrument( instrumentTrack * _instrument_track ) :
 	m_fontId( 0 ),
 	m_filename( "" ),
 	m_lastMidiPitch( 8192 ),
+	m_channel( 1 ),
+	m_maxChannels( 5 ),
 	m_bankNum( 0, 0, 999, this, tr("Bank") ),
 	m_patchNum( 0, 0, 127, this, tr("Patch") ),
 	m_gain( 1.0f, 0.0f, 5.0f, 0.01f, this, tr( "Gain" ) ),
@@ -387,7 +390,7 @@ void sf2Instrument::updatePatch( void )
 {
 	if( m_bankNum.value() >= 0 && m_patchNum.value() >= 0 )
 	{
-		fluid_synth_program_select( m_synth, 1, m_fontId,
+		fluid_synth_program_select( m_synth, m_channel, m_fontId,
 				m_bankNum.value(), m_patchNum.value() );
 	}
 }
@@ -573,8 +576,21 @@ void sf2Instrument::playNote( notePlayHandle * _n, sampleFrame * )
 		_n->m_pluginData = new int( midiNote );
 
 		m_synthMutex.lock();
-		fluid_synth_noteon( m_synth, 1, midiNote,
+		
+		short ctrl = 0x0A; // PAN_MSB
+		int pan = 0 + 
+			  ( (float)( _n->getPanning() - PanningLeft ) ) / 
+			  ( (float)( PanningRight - PanningLeft ) ) *
+			  ( (float)( 127 - 0 ) );
+		fluid_synth_cc( m_synth, m_channel, ctrl, pan );
+		fluid_synth_noteon( m_synth, m_channel, midiNote,
 							_n->getMidiVelocity() );
+		_n->setChannel( m_channel );
+		if( ++m_channel > m_maxChannels )
+		{
+			m_channel = 1;
+		}
+		
 		m_synthMutex.unlock();
 
 		m_notesRunningMutex.lock();
@@ -594,7 +610,7 @@ void sf2Instrument::play( sampleFrame * _working_buffer )
 	if( m_lastMidiPitch != getInstrumentTrack()->midiPitch() )
 	{
 		m_lastMidiPitch = getInstrumentTrack()->midiPitch();
-		fluid_synth_pitch_bend( m_synth, 1, m_lastMidiPitch );
+		fluid_synth_pitch_bend( m_synth, m_channel, m_lastMidiPitch );
 	}
 
 	if( m_internalSampleRate < engine::getMixer()->processingSampleRate() &&
@@ -648,7 +664,7 @@ void sf2Instrument::deleteNotePluginData( notePlayHandle * _n )
 	if( n <= 0 )
 	{
 		m_synthMutex.lock();
-		fluid_synth_noteoff( m_synth, 1, *midiNote );
+		fluid_synth_noteoff( m_synth, _n->channel(), *midiNote );
 		m_synthMutex.unlock();
 	}
 
diff --git a/plugins/sf2_player/sf2_player.h b/plugins/sf2_player/sf2_player.h
index fa53cbbbb..1a277e377 100644
--- a/plugins/sf2_player/sf2_player.h
+++ b/plugins/sf2_player/sf2_player.h
@@ -127,6 +127,8 @@ private:
 	int m_notesRunning[128];
 	sample_rate_t m_internalSampleRate;
 	int m_lastMidiPitch;
+	int m_channel;
+	int m_maxChannels;
 
 	lcdSpinBoxModel m_bankNum;
 	lcdSpinBoxModel m_patchNum;
diff --git a/src/core/note_play_handle.cpp b/src/core/note_play_handle.cpp
index b29ce78d4..76cac6fc5 100644
--- a/src/core/note_play_handle.cpp
+++ b/src/core/note_play_handle.cpp
@@ -73,6 +73,7 @@ notePlayHandle::notePlayHandle( instrumentTrack * _it,
 #ifdef LMMS_SINGERBOT_SUPPORT
 	m_patternIndex( 0 ),
 #endif
+	m_channel( 1 ),
 	m_origTempo( engine::getSong()->getTempo() )
 {
 	if( m_baseNote )