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diff --git a/utils/studiomdl/hardwarematrixstate.h b/utils/studiomdl/hardwarematrixstate.h
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+++ b/utils/studiomdl/hardwarematrixstate.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef HARDWAREMATRIXSTATE_H
+#define HARDWAREMATRIXSTATE_H
+#pragma once
+
+// This emulates the hardware matrix palette and keeps up with 
+// matrix usage, LRU's matrices, etc.
+class CHardwareMatrixState
+{
+public:
+	CHardwareMatrixState();
+
+	void Init( int numHardwareMatrices );
+	
+	// return false if there is no slot for this matrix.
+	bool AllocateMatrix( int globalMatrixID );
+
+	// deallocate the least recently used matrix
+	void DeallocateLRU( void );
+	void DeallocateLRU( int n );
+
+	// return true if a matrix is allocate.
+	bool IsMatrixAllocated( int globalMatrixID ) const;
+	
+	// flush usage flags - signifies that none of the matrices are being used in the current strip
+	// do this when starting a new strip.
+	void SetAllUnused();
+
+	void DeallocateAll();
+
+	// save the complete state of the hardware matrices
+	void SaveState();
+
+	// restore the complete state of the hardware matrices
+	void RestoreState();
+
+	// Returns the number of free + unsed matrices
+	int AllocatedMatrixCount() const;
+	int	FreeMatrixCount() const;
+
+	int GetNthBoneGlobalID( int n ) const;
+
+	void DumpState( void );
+
+private:
+	int FindHardwareMatrix( int globalMatrixID );
+	int FindLocalLRUIndex( void );
+
+	// Increment and return LRU counter.
+	struct MatrixState_t
+	{
+		bool allocated;
+		int lastUsageID;
+		int globalMatrixID;
+	};
+
+	int m_LRUCounter;
+	int m_NumMatrices;
+	int m_AllocatedMatrices;
+
+	MatrixState_t *m_matrixState;
+	MatrixState_t *m_savedMatrixState;
+};
+
+#endif // HARDWAREMATRIXSTATE_H