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diff --git a/indra/newview/lldriverparam.h b/indra/newview/lldriverparam.h
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+++ b/indra/newview/lldriverparam.h
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+/** 
+ * @file lldriverparam.h
+ * @brief A visual parameter that drives (controls) other visual parameters.
+ *
+ * Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLDRIVERPARAM_H
+#define LL_LLDRIVERPARAM_H
+
+#include "llvoavatar.h"
+#include "llviewervisualparam.h"
+
+//-----------------------------------------------------------------------------
+
+struct LLDrivenEntryInfo
+{
+	LLDrivenEntryInfo( S32 id, F32 min1, F32 max1, F32 max2, F32 min2 )
+		: mDrivenID( id ), mMin1( min1 ), mMax1( max1 ), mMax2( max2 ), mMin2( min2 ) {}
+	S32					mDrivenID;
+	F32					mMin1;
+	F32					mMax1;
+	F32					mMax2;
+	F32					mMin2;
+};
+
+struct LLDrivenEntry
+{
+	LLDrivenEntry( LLViewerVisualParam* param, LLDrivenEntryInfo *info )
+		: mParam( param ), mInfo( info ) {}
+	LLViewerVisualParam* mParam;
+	LLDrivenEntryInfo*	 mInfo;
+};
+
+//-----------------------------------------------------------------------------
+
+class LLDriverParamInfo : public LLViewerVisualParamInfo
+{
+	friend class LLDriverParam;
+public:
+	LLDriverParamInfo();
+	/*virtual*/ ~LLDriverParamInfo() {};
+	
+	/*virtual*/ BOOL parseXml(LLXmlTreeNode* node);
+
+protected:
+	typedef std::deque<LLDrivenEntryInfo> entry_info_list_t;
+	entry_info_list_t mDrivenInfoList;
+};
+
+//-----------------------------------------------------------------------------
+
+class LLDriverParam : public LLViewerVisualParam
+{
+public:
+	LLDriverParam(LLVOAvatar *avatarp);
+	~LLDriverParam();
+
+	// Special: These functions are overridden by child classes
+	LLDriverParamInfo*		getInfo() const { return (LLDriverParamInfo*)mInfo; }
+	//   This sets mInfo and calls initialization functions
+	BOOL					setInfo(LLDriverParamInfo *info);
+
+	// LLVisualParam Virtual functions
+	///*virtual*/ BOOL				parseData(LLXmlTreeNode* node);
+	/*virtual*/ void				apply( ESex sex ) {} // apply is called separately for each driven param.
+	/*virtual*/ void				setWeight(F32 weight, BOOL set_by_user);
+	/*virtual*/ void				setAnimationTarget( F32 target_value, BOOL set_by_user );
+	/*virtual*/ void				stopAnimating(BOOL set_by_user);
+	
+	// LLViewerVisualParam Virtual functions
+	/*virtual*/ F32					getTotalDistortion();
+	/*virtual*/ const LLVector3&	getAvgDistortion();
+	/*virtual*/ F32					getMaxDistortion();
+	/*virtual*/ LLVector3			getVertexDistortion(S32 index, LLPolyMesh *poly_mesh);
+	/*virtual*/ const LLVector3*	getFirstDistortion(U32 *index, LLPolyMesh **poly_mesh);
+	/*virtual*/ const LLVector3*	getNextDistortion(U32 *index, LLPolyMesh **poly_mesh);
+protected:
+	F32 getDrivenWeight(const LLDrivenEntry* driven, F32 input_weight);
+
+
+	LLVector3	mDefaultVec; // temp holder
+	typedef std::vector<LLDrivenEntry> entry_list_t;
+	entry_list_t mDriven;
+	LLViewerVisualParam* mCurrentDistortionParam;
+	LLVOAvatar* mAvatarp;
+};
+
+#endif  // LL_LLDRIVERPARAM_H