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+/** 
+ * @file llmatrix3a.h
+ * @brief LLMatrix3a class header file - memory aligned and vectorized 3x3 matrix
+ *
+ * $LicenseInfo:firstyear=2010&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	LL_LLMATRIX3A_H
+#define	LL_LLMATRIX3A_H
+
+/////////////////////////////
+// LLMatrix3a, LLRotation
+/////////////////////////////
+// This class stores a 3x3 (technically 4x3) matrix in column-major order
+/////////////////////////////
+/////////////////////////////
+// These classes are intentionally minimal right now. If you need additional
+// functionality, please contact someone with SSE experience (e.g., Falcon or
+// Huseby).
+/////////////////////////////
+
+// LLMatrix3a is the base class for LLRotation, which should be used instead any time you're dealing with a 
+// rotation matrix.
+class LLMatrix3a
+{
+public:
+
+	// Utility function for quickly transforming an array of LLVector4a's
+	// For transforming a single LLVector4a, see LLVector4a::setRotated
+	static void batchTransform( const LLMatrix3a& xform, const LLVector4a* src, int numVectors, LLVector4a* dst );
+
+	// Utility function to obtain the identity matrix
+	static inline const LLMatrix3a& getIdentity();
+
+	//////////////////////////
+	// Ctors
+	//////////////////////////
+	
+	// Ctor
+	LLMatrix3a() {}
+
+	// Ctor for setting by columns
+	inline LLMatrix3a( const LLVector4a& c0, const LLVector4a& c1, const LLVector4a& c2 );
+
+	//////////////////////////
+	// Get/Set
+	//////////////////////////
+
+	// Loads from an LLMatrix3
+	inline void loadu(const LLMatrix3& src);
+	
+	// Set rows
+	inline void setRows(const LLVector4a& r0, const LLVector4a& r1, const LLVector4a& r2);
+	
+	// Set columns
+	inline void setColumns(const LLVector4a& c0, const LLVector4a& c1, const LLVector4a& c2);
+
+	// Get the read-only access to a specified column. Valid columns are 0-2, but the 
+	// function is unchecked. You've been warned.
+	inline const LLVector4a& getColumn(const U32 column) const;
+
+	/////////////////////////
+	// Matrix modification
+	/////////////////////////
+	
+	// Set this matrix to the product of lhs and rhs ( this = lhs * rhs )
+	void setMul( const LLMatrix3a& lhs, const LLMatrix3a& rhs );
+
+	// Set this matrix to the transpose of src
+	inline void setTranspose(const LLMatrix3a& src);
+
+	// Set this matrix to a*w + b*(1-w)
+	inline void setLerp(const LLMatrix3a& a, const LLMatrix3a& b, F32 w);
+
+	/////////////////////////
+	// Matrix inspection
+	/////////////////////////
+
+	// Sets all 4 elements in 'dest' to the determinant of this matrix.
+	// If you will be using the determinant in subsequent ops with LLVector4a, use this version
+	inline void getDeterminant( LLVector4a& dest ) const;
+
+	// Returns the determinant as an LLSimdScalar. Use this if you will be using the determinant
+	// primary for scalar operations.
+	inline LLSimdScalar getDeterminant() const;
+
+	// Returns nonzero if rows 0-2 and colums 0-2 contain no NaN or INF values. Row 3 is ignored
+	inline LLBool32 isFinite() const;
+
+	// Returns true if this matrix is equal to 'rhs' up to 'tolerance'
+	inline bool isApproximatelyEqual( const LLMatrix3a& rhs, F32 tolerance = F_APPROXIMATELY_ZERO ) const;
+
+protected:
+
+	LLVector4a mColumns[3];
+
+};
+
+class LLRotation : public LLMatrix3a
+{
+public:
+	
+	LLRotation() {}
+	
+	// Returns true if this rotation is orthonormal with det ~= 1
+	inline bool isOkRotation() const;		
+};
+
+#endif