Function g3_ClipPolygon

renderer/HardwareClipper.cpp:344–370

Clips a polygon Parameters: pointlist - pointer to a list of pointers to points nv - the number of points in the polygon cc - the clip codes for this polygon Returns: a pointer to a list of pointer of points in the clipped polygon NOTE: You MUST call g3_FreeTempPoints() when you're done with the clipped polygon

// Returns:	a pointer to a list of pointer of points in the clipped polygon
// NOTE: You MUST call g3_FreeTempPoints() when you're done with the clipped polygon
g3Point **g3_ClipPolygon(g3Point **pointlist, int *nv, g3Codes *cc) {
  int plane_flag;
  g3Point **dest;

  dest = Vbuf0;

  //&	ASSERT(free_point_num == 0);	//DAJ UTB CMO
  if (free_point_num != 0) {
    mprintf(1, "clipper: leftover temp point\n");
    free_point_num = 0;
    Int3();
  }

  for (plane_flag = 1; plane_flag <= 32; plane_flag <<= 1) {
    if (cc->cc_or & plane_flag) {

      *nv = ClipPlane(plane_flag, pointlist, dest, nv, cc);

      if (cc->cc_and) // clipped away
        return dest;

      pointlist = dest;
      dest = (pointlist == Vbuf0) ? Vbuf1 : Vbuf0;
    }
  }
  return pointlist; // we swapped after we copied
}

// sets the z distance of the far clipping plane
void g3_SetFarClipZ(float z) { Far_clip_z = z; }