GPGPU Programming for Games and Science

332 GPGPU Programming for Games and Science

// Multiplication of transforms. M0 is ’ this ’, M1 is ’transform ’,

// and the function returns M0∗M1 .

Transform<Real> operator∗ ( Transform<Real> const& transform ) const ;

private :

// Compute th e b a s e −c la s s Matrix4x4<Real> from the channels .

void UpdateMatrix () ;

Quaternion<Real> mQuaternion ;

Real mTranslation [3 ] , mScale ;

} ;

LISTING 6.41:TheTransform class in GTEngine.

The

Transform class stores the individual channels for rotation, translation,

and uniform scale. Each

Set* operation invokes the private UpdateMatrix that

computes the actual 4 × 4 affine representation and stores it in the

Matrix4x4 ...