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73 lines
2.1 KiB
73 lines
2.1 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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LOGICAL FUNCTION MPWIND(LEFT,RIGHT,BOTTOM,TOP,NEAR,FAR)
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COMMON /MAP/MODEL(4,4),VIEW(4,4),PROJ(4,4),CPNEAR,CPFAR,VWPORT(4),
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* MVP(4,4),VP(4,4),CPLINE(2,2,10),CPPLAN(2,3,10),PEYE(3),
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* PLOOK(3),ETWIST,NCPLIN,NCPLAN,TMAT1(4,4),TMAT2(4,4),
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* TMAT3(4,4),TVEC1(4),TVEC2(4),TVEC3(4),TVEC4(4),TARR1(32),
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* TARR2(32),TARR3(32),TARR4(32),TARR5(32),TARR6(32),
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* TARR7(32),TARR8(32)
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REAL MODEL,MVP
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REAL LEFT,NEAR
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CHARACTER*6 SUBNAM
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PARAMETER (SUBNAM='MPWIND')
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MPWIND = .FALSE.
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IF (NEAR.LT.0.) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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* 'You cannot specify the near clipping plane less than 0.'
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* ,2)
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RETURN
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END IF
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IF (NEAR.GE.FAR) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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*'You cannot specify the near clipping plane >= to the far clipping
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* plane',2)
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RETURN
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END IF
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IF (RIGHT.EQ.LEFT) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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*'You cannot specify the right and left edges of the viewing frustr
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*um as equal',2)
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RETURN
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END IF
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IF (TOP.EQ.BOTTOM) THEN
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CALL PLTFLU
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CALL SIORPT(SUBNAM,
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*'You cannot specify the top and bottom edges of the viewing frustr
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*um as equal',2)
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RETURN
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END IF
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MPWIND = .TRUE.
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CALL MXZERO(4,PROJ)
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PROJ(1,1) = 2.*NEAR/ (RIGHT-LEFT)
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PROJ(2,2) = 2.*NEAR/ (TOP-BOTTOM)
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PROJ(3,1) = (RIGHT+LEFT)/ (RIGHT-LEFT)
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PROJ(3,2) = (TOP+BOTTOM)/ (TOP-BOTTOM)
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PROJ(3,3) = - (FAR+NEAR)/ (FAR-NEAR)
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PROJ(3,4) = -1.
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PROJ(4,3) = - (2.*FAR*NEAR)/ (FAR-NEAR)
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CPNEAR = NEAR
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CPFAR = FAR
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CALL MXMULT(4,VIEW,PROJ,VP)
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CALL MXMULT(4,MODEL,VP,MVP)
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RETURN
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END
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