}
#ifdef IPOL_Z
line.z[0] += slopeZ;
#endif
#ifdef IPOL_W
line.w[0] += slopeW;
#ifdef IPOL_C0
line.c[0][0] += slopeC[0];
#ifdef IPOL_C1
line.c[1][0] += slopeC[1];
#ifdef IPOL_T0
line.t[0][0] += slopeT[0];
#ifdef IPOL_T1
line.t[1][0] += slopeT[1];