From 03ac816e83dded357d9f72be969b1cee64e97dfe Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Sun, 26 Feb 2017 14:04:30 +0100
Subject: [PATCH] - added a gme_stereodepth CVAR.

---
 src/sound/i_music.cpp   |  4 ++++
 src/sound/i_music.h     |  1 +
 src/sound/music_gme.cpp | 22 ++++++++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/src/sound/i_music.cpp b/src/sound/i_music.cpp
index 1cbca0863..a896aeee7 100644
--- a/src/sound/i_music.cpp
+++ b/src/sound/i_music.cpp
@@ -279,6 +279,10 @@ void MusInfo::TimidityVolumeChanged()
 {
 }
 
+void MusInfo::GMEDepthChanged(float val)
+{
+}
+
 void MusInfo::FluidSettingInt(const char *, int)
 {
 }
diff --git a/src/sound/i_music.h b/src/sound/i_music.h
index aaa00b020..069d2f142 100644
--- a/src/sound/i_music.h
+++ b/src/sound/i_music.h
@@ -84,6 +84,7 @@ public:
 	virtual void FluidSettingNum(const char *setting, double value);		// "
 	virtual void FluidSettingStr(const char *setting, const char *value);	// "
 	virtual void WildMidiSetOption(int opt, int set);
+	virtual void GMEDepthChanged(float val);
 
 	void Start(bool loop, float rel_vol = -1.f, int subsong = 0);
 
diff --git a/src/sound/music_gme.cpp b/src/sound/music_gme.cpp
index 6038f2349..d00728ec6 100644
--- a/src/sound/music_gme.cpp
+++ b/src/sound/music_gme.cpp
@@ -43,6 +43,7 @@
 #include <gme/gme.h>
 #include "v_text.h"
 #include "files.h"
+#include "templates.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -67,6 +68,7 @@ protected:
 	bool StartTrack(int track, bool getcritsec=true);
 	bool GetTrackInfo();
 	int CalcSongLength();
+	void GMEDepthChanged(float val);
 
 	static bool Read(SoundStream *stream, void *buff, int len, void *userdata);
 };
@@ -84,6 +86,12 @@ protected:
 // Currently not used.
 CVAR (Float, spc_amp, 1.875f, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 
+CUSTOM_CVAR(Float, gme_stereodepth, 0.f, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
+{
+	if (currSong != nullptr)
+		currSong->GMEDepthChanged(self);
+}
+
 // PRIVATE DATA DEFINITIONS ------------------------------------------------
 
 // CODE --------------------------------------------------------------------
@@ -146,6 +154,7 @@ MusInfo *GME_OpenSong(FileReader &reader, const char *fmt)
         reader.Seek(fpos, SEEK_SET);
 		return NULL;
 	}
+	gme_set_stereo_depth(emu, clamp(*gme_stereodepth, 0.f, 1.f));
 	return new GMESong(emu, sample_rate);
 }
 
@@ -189,6 +198,19 @@ GMESong::~GMESong()
 }
 
 
+//==========================================================================
+//
+// GMESong :: GMEDepthChanged
+//
+//==========================================================================
+
+void GMESong::GMEDepthChanged(float val)
+{
+	if (Emu != nullptr)
+		gme_set_stereo_depth(Emu, clamp(val, 0.f, 1.f));
+}
+
+
 //==========================================================================
 //
 // GMESong :: Play