multiplyMatrices method

Matrix4 multiplyMatrices(Matrix4 a, Matrix4 b)

Multiplies two given matrices and stores the result in this matrix.

Implementation

Matrix4 multiplyMatrices(Matrix4 a, Matrix4 b ) {
	final ae = a.elements;
	final be = b.elements;
	final e = elements;

	final a11 = ae[ 0 ], a12 = ae[ 4 ], a13 = ae[ 8 ], a14 = ae[ 12 ];
	final a21 = ae[ 1 ], a22 = ae[ 5 ], a23 = ae[ 9 ], a24 = ae[ 13 ];
	final a31 = ae[ 2 ], a32 = ae[ 6 ], a33 = ae[ 10 ], a34 = ae[ 14 ];
	final a41 = ae[ 3 ], a42 = ae[ 7 ], a43 = ae[ 11 ], a44 = ae[ 15 ];

	final b11 = be[ 0 ], b12 = be[ 4 ], b13 = be[ 8 ], b14 = be[ 12 ];
	final b21 = be[ 1 ], b22 = be[ 5 ], b23 = be[ 9 ], b24 = be[ 13 ];
	final b31 = be[ 2 ], b32 = be[ 6 ], b33 = be[ 10 ], b34 = be[ 14 ];
	final b41 = be[ 3 ], b42 = be[ 7 ], b43 = be[ 11 ], b44 = be[ 15 ];

	e[ 0 ] = ( a11 * b11 ) + ( a12 * b21 ) + ( a13 * b31 ) + ( a14 * b41 );
	e[ 4 ] = ( a11 * b12 ) + ( a12 * b22 ) + ( a13 * b32 ) + ( a14 * b42 );
	e[ 8 ] = ( a11 * b13 ) + ( a12 * b23 ) + ( a13 * b33 ) + ( a14 * b43 );
	e[ 12 ] = ( a11 * b14 ) + ( a12 * b24 ) + ( a13 * b34 ) + ( a14 * b44 );

	e[ 1 ] = ( a21 * b11 ) + ( a22 * b21 ) + ( a23 * b31 ) + ( a24 * b41 );
	e[ 5 ] = ( a21 * b12 ) + ( a22 * b22 ) + ( a23 * b32 ) + ( a24 * b42 );
	e[ 9 ] = ( a21 * b13 ) + ( a22 * b23 ) + ( a23 * b33 ) + ( a24 * b43 );
	e[ 13 ] = ( a21 * b14 ) + ( a22 * b24 ) + ( a23 * b34 ) + ( a24 * b44 );

	e[ 2 ] = ( a31 * b11 ) + ( a32 * b21 ) + ( a33 * b31 ) + ( a34 * b41 );
	e[ 6 ] = ( a31 * b12 ) + ( a32 * b22 ) + ( a33 * b32 ) + ( a34 * b42 );
	e[ 10 ] = ( a31 * b13 ) + ( a32 * b23 ) + ( a33 * b33 ) + ( a34 * b43 );
	e[ 14 ] = ( a31 * b14 ) + ( a32 * b24 ) + ( a33 * b34 ) + ( a34 * b44 );

	e[ 3 ] = ( a41 * b11 ) + ( a42 * b21 ) + ( a43 * b31 ) + ( a44 * b41 );
	e[ 7 ] = ( a41 * b12 ) + ( a42 * b22 ) + ( a43 * b32 ) + ( a44 * b42 );
	e[ 11 ] = ( a41 * b13 ) + ( a42 * b23 ) + ( a43 * b33 ) + ( a44 * b43 );
	e[ 15 ] = ( a41 * b14 ) + ( a42 * b24 ) + ( a43 * b34 ) + ( a44 * b44 );

	return this;
}