More work. Audio driver works enough to play music now.

GpD3D/GpMutex_Win32.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "HostMutex.h"
+
+#include "GpWindows.h"
+
+class GpMutex_Win32 final : public PortabilityLayer::HostMutex
+{
+public:
+	void Destroy() override;
+	void Lock() override;
+	void Unlock() override;
+
+	static GpMutex_Win32 *Create();
+
+private:
+	const GpMutex_Win32();
+	~GpMutex_Win32();
+
+	CRITICAL_SECTION m_critSection;
+};