Default MIDI device is now created by sound backend

OpenAL backend now plays music by default
It uses WinMM device on Windows and OPL on other platforms

src/sound/fmodsound.cpp

@@ -64,6 +64,7 @@ extern HWND Window;
 #include "cmdlib.h"
 #include "s_sound.h"
 #include "files.h"
+#include "i_musicinterns.h"
 
 #if FMOD_VERSION > 0x42899 && FMOD_VERSION < 0x43400
 #error You are trying to compile with an unsupported version of FMOD.
@@ -3478,6 +3479,11 @@ FMOD_RESULT FMODSoundRenderer::SetSystemReverbProperties(const REVERB_PROPERTIES
 #endif
 }
 
+MIDIDevice* FMODSoundRenderer::CreateMIDIDevice() const
+{
+	return new SndSysMIDIDevice;
+}
+
 #endif // NO_FMOD
 
 

src/sound/fmodsound.h

@@ -68,6 +68,8 @@ public:
 
 	void DrawWaveDebug(int mode);
 
+	virtual MIDIDevice* CreateMIDIDevice() const override;
+
 private:
 	DWORD ActiveFMODVersion;
 	int SFXPaused;

src/sound/i_sound.cpp

@@ -250,6 +250,11 @@ public:
 	{
 		return "Null sound module has no stats.";
 	}
+
+	virtual MIDIDevice* CreateMIDIDevice() const override
+	{
+		return nullptr;
+	}
 };
 
 void I_InitSound ()

src/sound/i_sound.h

@@ -85,6 +85,7 @@ public:
 typedef bool (*SoundStreamCallback)(SoundStream *stream, void *buff, int len, void *userdata);
 
 struct SoundDecoder;
+class MIDIDevice;
 
 class SoundRenderer
 {
@@ -157,6 +158,8 @@ public:
 
 	virtual void DrawWaveDebug(int mode);
 
+	virtual MIDIDevice* CreateMIDIDevice() const = 0;
+
 protected:
     virtual SoundDecoder *CreateDecoder(FileReader *reader);
 };

src/sound/music_midistream.cpp

@@ -273,7 +273,7 @@ MIDIDevice *MIDIStreamer::CreateMIDIDevice(EMidiDevice devtype) const
 #endif
 
 	case MDEV_SNDSYS:
-		return new SndSysMIDIDevice;
+		return GSnd->CreateMIDIDevice();
 
 	case MDEV_GUS:
 		return new TimidityMIDIDevice(Args);

src/sound/oalsound.cpp

@@ -2052,6 +2052,16 @@ void OpenALSoundRenderer::PrintDriversList()
 	}
 }
 
+MIDIDevice* OpenALSoundRenderer::CreateMIDIDevice() const
+{
+#ifdef _WIN32
+	extern UINT mididevice;
+	return new WinMIDIDevice(mididevice);
+#else
+	return new OPLMIDIDevice(nullptr);
+#endif
+}
+
 void OpenALSoundRenderer::PurgeStoppedSources()
 {
 	// Release channels that are stopped

src/sound/oalsound.h

@@ -131,6 +131,8 @@ public:
 	virtual void PrintDriversList();
 	virtual FString GatherStats();
 
+	virtual MIDIDevice* CreateMIDIDevice() const override;
+
 private:
     struct {
         bool EXT_EFX;