Audio: Implement support for ALC_EXT_thread_local_context

include/Nazara/Audio/OpenALDevice.hpp

@@ -27,6 +27,7 @@ namespace Nz
 	enum class OpenALExtension
 	{
 		SourceLatency,
+		ThreadLocalContext,
 
 		Max = SourceLatency
 	};
@@ -82,6 +83,8 @@ namespace Nz
 			OpenALDevice& operator=(const OpenALDevice&) = delete;
 			OpenALDevice& operator=(OpenALDevice&&) = delete;
 
+			static const OpenALDevice* GetCurrentDevice();
+
 			// We give each device its own set of function pointer, even though regular OpenAL extensions are always the same (for a set library).
 			// This makes it easier to wrap them (for error handling), and extension pointers are device-local anyway.
 #define NAZARA_AUDIO_AL_ALC_FUNCTION(name) decltype(&::name) name;