C ++************************************************************************
C
C INTERP3                             USED ALLOCATE MAY 00 ARDEAN LEITH
C
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C
C     INTERP3(LUN1,LUN2,NSAM,NROW,NSLICE,NSAM1,NROW1,NSLICE1,MAXMEM)
C
C     PURPOSE:  3 D INTERPOLATION
C                                                                     *
C **********************************************************************

      SUBROUTINE INTERP3(LUN1,LUN2,NSAM,NROW,NSLICE,
     &                             NSAM1,NROW1,NSLICE1,MAXMEM)
 
      INCLUDE 'CMBLOCK.INC' 
      INCLUDE 'CMLIMIT.INC'
 
      COMMON       BAF(1)

      COMMON /IOBUF/ BUF(NBUFSIZ)

      REAL, ALLOCATABLE, DIMENSION(:) :: QPT
 
C     ALLOCATE MEMORY IF NEEDED
      MEMWANT = NSAM * NROW * NSLICE

      IF (MEMWANT .GT. MAXMEM) THEN
C        ALLOCATE MEMORY TO HOLD VOLUME
         ALLOCATE (QPT(MEMWANT), STAT=IRTFLG)
         IF (IRTFLG .NE. 0) THEN
            CALL ERRT(46,'INTERP3, QPT',NDUM)
            RETURN
         ENDIF
         WRITE(NOUT,*) 'ALLOCATED MEMORY FOR VOLUME:',MEMWANT

C        LOAD VOLUME
         CALL READV(LUN1,QPT,NSAM,NROW,NSAM,NROW,NSLICE)

C        CALL INTERPOLATION ROUTINE
         CALL IRP3(QPT,BUF,NSAM,NROW,NSLICE,
     &            NSAM1,NROW1,NSLICE1,LUN2)
 
         DEALLOCATE(QPT)

      ELSE
C        USE COMMON BLOCK TO HOLD VOLUME
         WRITE(NOUT,*) 'USED COMMON BLOCK FOR VOLUME'

C        LOAD VOLUME
         CALL READV(LUN1,BAF,NSAM,NROW,NSAM,NROW,NSLICE)

C        CALL INTERPOLATION ROUTINE
         CALL IRP3(BAF,BUF,NSAM,NROW,NSLICE,
     &            NSAM1,NROW1,NSLICE1,LUN2)

      ENDIF
 
      RETURN
      END