Wm4MathMCR.h

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00001 // Wild Magic Source Code
00002 // David Eberly
00003 // http://www.geometrictools.com
00004 // Copyright (c) 1998-2008
00005 //
00006 // This library is free software; you can redistribute it and/or modify it
00007 // under the terms of the GNU Lesser General Public License as published by
00008 // the Free Software Foundation; either version 2.1 of the License, or (at
00009 // your option) any later version.  The license is available for reading at
00010 // either of the locations:
00011 //     http://www.gnu.org/copyleft/lgpl.html
00012 //     http://www.geometrictools.com/License/WildMagicLicense.pdf
00013 //
00014 // Version: 4.0.0 (2006/06/28)
00015 
00016 #ifndef WM4MATHMCR_H
00017 #define WM4MATHMCR_H
00018 
00019 //----------------------------------------------------------------------------
00020 
00021 // Fast conversion from a IEEE 32-bit floating point number F in [0,1] to a
00022 // a 32-bit integer I in [0,2^L-1].
00023 //
00024 //   fFloat = F
00025 //   iLog = L
00026 //   iInt = I
00027 
00028 #define WM4_SCALED_FLOAT_TO_INT(fFloat,iLog,iInt)\
00029 { \
00030     int iShift = 150 - iLog - ((*(int*)(&fFloat) >> 23) & 0xFF); \
00031     if ( iShift < 24 ) \
00032     { \
00033         iInt = ((*(int*)(&fFloat) & 0x007FFFFF) | \
00034             0x00800000) >> iShift; \
00035         if ( iInt == (1 << iLog) ) \
00036         { \
00037             iInt--; \
00038         } \
00039     } \
00040     else \
00041     { \
00042         iInt = 0; \
00043     } \
00044 }
00045 
00046 //----------------------------------------------------------------------------
00047 
00048 #endif

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