Loads a floating-point scalar value into an XMVECTOR.
XMVECTOR XM_CALLCONV XMLoadFloat( const float *pSource );
Address of the scalar data to load. The data pointed to by this parameter must be 4-byte aligned and reside in cached memory.
Returns an XMVECTOR whose x member is loaded with the data from the pSource parameter. The other components of the returned vector will be initialized to 0.