subroutine hpf_fill_in_data(target, w, h, ccr, cci, cstep, nmin, nmax) integer, intent(in) :: w, h byte, intent(out) :: target(w,h) real*8, intent(in) :: ccr, cci, cstep integer, intent(in) :: nmin, nmax !hpf$ distribute target(*, cyclic) integer :: cx, cy cx = w/2 cy = h/2 forall(ix = 1:w, iy = 1:h) & target(ix,iy) = mandel_val(CMPLX(ccr + ((ix-cx)*cstep), & cci + ((iy-cx)*cstep), & KIND=KIND(0.0D0)), & nmin, nmax) contains pure byte function mandel_val(x, nmin, nmax) complex(KIND=KIND(0.0D0)), intent(in) :: x integer, intent(in) :: nmin, nmax integer :: n real(kind=KIND(0.0D0)) :: xorgr, xorgi, xr, xi, xr2, xi2, rad2 logical :: keepgoing n = -1 xorgr = REAL(x) xorgi = AIMAG(x) xr = xorgr xi = xorgi do n = n + 1 xr2 = xr*xr xi2 = xi*xi xi = 2*(xr*xi) + xorgi keepgoing = n < nmax rad2 = xr2 + xi2 xr = xr2 - xi2 + xorgr if (keepgoing .AND. (rad2 <= 4.0)) cycle exit end do if (n >= nmax) then mandel_val = nmax-nmin else mandel_val = MOD(n, nmax-nmin) end if end function mandel_val end subroutine hpf_fill_in_data