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diff --git a/game/shared/iplayeranimstate.h b/game/shared/iplayeranimstate.h
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+++ b/game/shared/iplayeranimstate.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef IPLAYERANIMSTATE_H
+#define IPLAYERANIMSTATE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+
+typedef enum
+{
+	LEGANIM_9WAY,		// Legs use a 9-way blend, with "move_x" and "move_y" pose parameters.
+	LEGANIM_8WAY,		// Legs use an 8-way blend with "move_yaw" pose param.
+	LEGANIM_GOLDSRC	// Legs always point in the direction he's running and the torso rotates.
+} LegAnimType_t;
+
+
+
+abstract_class IPlayerAnimState
+{
+public:
+	virtual void Release() = 0;
+
+	// Update() and DoAnimationEvent() together maintain the entire player's animation state.
+	//
+	// Update() maintains the the lower body animation (the player's m_nSequence)
+	// and the upper body overlay based on the player's velocity and look direction.
+	//
+	// It also modulates these based on events triggered by DoAnimationEvent.
+	virtual void Update( float eyeYaw, float eyePitch ) = 0;
+
+	// This is called by the client when a new player enters the PVS to clear any events
+	// the dormant version of the entity may have been playing.
+	virtual void ClearAnimationState() = 0;
+
+	// The client uses this to figure out what angles to render the entity with (since as the guy turns,
+	// it will change his body_yaw pose parameter before changing his rendered angle).
+	virtual const QAngle& GetRenderAngles() = 0;
+};
+
+
+#endif // IPLAYERANIMSTATE_H