From ca161f6e31223526b89a264693bccc1e4560690f Mon Sep 17 00:00:00 2001
From: Iliyas Jorio <iliyas@jor.io>
Date: Sat, 21 Nov 2020 14:22:58 +0100
Subject: [PATCH] Implement volumeCmd

---
 src/Sound/SoundManager.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/Sound/SoundManager.cpp b/src/Sound/SoundManager.cpp
index 777ee60..89d5525 100644
--- a/src/Sound/SoundManager.cpp
+++ b/src/Sound/SoundManager.cpp
@@ -493,10 +493,22 @@ OSErr SndDoImmediate(SndChannelPtr chan, const SndCommand* cmd)
 		break;
 
 	case ampCmd:
-		impl.source.SetGain(cmd->param1 / 255.0);
-		LOG << "ampCmd " << impl.source.gain << "\n";
+		impl.source.SetGain(cmd->param1 / 256.0);
 		break;
 
+	case volumeCmd:
+	{
+		uint16_t lvol = (cmd->param2      ) & 0xFFFF;
+		uint16_t rvol = (cmd->param2 >> 16) & 0xFFFF;
+
+		double pan = (double)rvol / (rvol + lvol);
+		pan = (pan - 0.5) * 2.0;  // Transpose pan from [0...1] to [-1...+1]
+
+		impl.source.SetPan(pan);
+		impl.source.SetGain(std::max(lvol, rvol) / 256.0);
+		break;
+	}
+
 	case freqCmd:
 		LOG << "freqCmd " << cmd->param2 << " " << GetMidiNoteName(cmd->param2) << " " << midiNoteFrequencies[cmd->param2] << "\n";
 		impl.playbackNote = Byte(cmd->param2);