Source/System/NodeCores/Drawables/Nurbs/Internal/OSGrounding.h

   1 /* GTS - Library for the manipulation of triangulated surfaces
   2  * Copyright (C) 1999 Stéphane Popinet
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19 #ifdef __sgi
  20 #pragma once
  21 #endif
  22
  23 #include "OSGSystemDef.h"
  24 #include "OSGConfig.h"
  25
  26 OSG_BEGIN_NAMESPACE
  27
  28 // This is only necessary for Intel CPUs, to make sure they
  29 // don't use a higher precision internally
  30
  31 #if defined(WIN32) || defined(__linux)
  32
  33 #ifndef WIN32
  34 #define OSG_HAVE_FPU_CONTROL_H  1
  35 #endif /* WIN32 */
  36
  37 #ifdef OSG_HAVE_FPU_CONTROL_H
  38 #  include <fpu_control.h>
  39 #  ifdef _FPU_EXTENDED
  40 static fpu_control_t fpu_round_double =
  41     (_FPU_DEFAULT & ~_FPU_EXTENDED) | _FPU_DOUBLE;
  42 static fpu_control_t fpu_init;
  43 #    define OSG_FPU_ROUND_DOUBLE  { _FPU_GETCW(fpu_init); \
  44                                     _FPU_SETCW(fpu_round_double); }
  45 #    define OSG_FPU_RESTORE       {_FPU_SETCW(fpu_init);}
  46 #  else /* not FPU_EXTENDED */
  47 #    define OSG_FPU_ROUND_DOUBLE
  48 #    define OSG_FPU_RESTORE
  49 #  endif /* not FPU_EXTENDED */
  50 #else /* not OSG_HAVE_FPU_CONTROL_H */
  51 #  ifdef OSG_HAVE_FLOATINGPOINT_H
  52 #    include <floatingpoint.h>
  53 #    define OSG_FPU_ROUND_DOUBLE  (fpsetprec(FP_PD))
  54 #    define OSG_FPU_RESTORE       (fpsetprec(FP_PE))
  55 #  else /* not OSG_HAVE_FLOATINGPOINT_H */
  56 #    if defined(WIN32) && !defined(_WIN64)
  57 #      ifdef _MSC_VER
  58 #        include <float.h>
  59 static unsigned int fpu_init;
  60 #        define OSG_FPU_ROUND_DOUBLE (fpu_init = _controlfp(0, 0), \
  61                                       _controlfp(_PC_53, _MCW_PC))
  62 #        define OSG_FPU_RESTORE      (_controlfp(fpu_init, 0xfffff))
  63 #      else /* not _MSC_VER */
  64 #        error "You need the Microsoft C compiler for the Win32 version"
  65 #      endif /*  not _MSC_VER */
  66 #    elif defined(_WIN64)
  67 #      pragma message("Windows x64 environment does not support rounding mode control")
  68 #      define OSG_FPU_ROUND_DOUBLE
  69 #      define OSG_FPU_RESTORE
  70 #    else
  71 #      error "Unknown CPU: assuming default double precision rounding"
  72 #      define OSG_FPU_ROUND_DOUBLE
  73 #      define OSG_FPU_RESTORE
  74 #    endif
  75 #  endif /* not OSG_HAVE_FLOATINGPOINT_H */
  76 #endif /* not OSG_HAVE_FPU_CONTROL_H */
  77
  78 #else // Other systems: not needed, define empty
  79
  80 #define OSG_FPU_ROUND_DOUBLE
  81 #define OSG_FPU_RESTORE
  82
  83 #endif
  84
  85 OSG_END_NAMESPACE