Working up to start of menu loading

GpApp/SoundSync_Win32.cpp

@@ -0,0 +1,31 @@
+#include "SoundSync.h"
+#include <Windows.h>
+
+#include <string.h>
+
+static volatile uint64_t gs_prioritiesBlob = 0;
+
+SoundSyncState SoundSync_ReadAll()
+{
+	const uint16_t priorities = gs_prioritiesBlob;
+
+	SoundSyncState state;
+	state.priority0 = static_cast<uint16_t>((priorities >> 0) & 0xffff);
+	state.priority1 = static_cast<uint16_t>((priorities >> 16) & 0xffff);
+	state.priority2 = static_cast<uint16_t>((priorities >> 32) & 0xffff);
+	state.priority3 = static_cast<uint16_t>((priorities >> 48) & 0xffff);
+
+	return state;
+}
+
+void SoundSync_ClearPriority(int index)
+{
+	const uint64_t clearMask = ~(static_cast<int64_t>(0xffff) << (index * 16));
+	InterlockedAnd(&gs_prioritiesBlob, clearMask);
+}
+
+void SoundSync_PutPriority(int index, int16_t priority)
+{
+	const uint64_t insertMask = static_cast<int64_t>(priority) << (index * 16);
+	InterlockedOr(&gs_prioritiesBlob, insertMask);
+}