120ca87015
git-svn-id: https://free-cad.svn.sourceforge.net/svnroot/free-cad/trunk@5000 e8eeb9e2-ec13-0410-a4a9-efa5cf37419d
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
// Wild Magic Source Code
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// David Eberly
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// http://www.geometrictools.com
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// Copyright (c) 1998-2007
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or (at
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// your option) any later version. The license is available for reading at
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// either of the locations:
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// http://www.gnu.org/copyleft/lgpl.html
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// http://www.geometrictools.com/License/WildMagicLicense.pdf
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// The license applies to versions 0 through 4 of Wild Magic.
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//
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// Version: 4.0.0 (2006/06/28)
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#ifndef WM4MATHMCR_H
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#define WM4MATHMCR_H
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//----------------------------------------------------------------------------
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// Fast conversion from a IEEE 32-bit floating point number F in [0,1] to a
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// a 32-bit integer I in [0,2^L-1].
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//
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// fFloat = F
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// iLog = L
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// iInt = I
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#define WM4_SCALED_FLOAT_TO_INT(fFloat,iLog,iInt)\
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{ \
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int iShift = 150 - iLog - ((*(int*)(&fFloat) >> 23) & 0xFF); \
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if ( iShift < 24 ) \
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{ \
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iInt = ((*(int*)(&fFloat) & 0x007FFFFF) | \
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0x00800000) >> iShift; \
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if ( iInt == (1 << iLog) ) \
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{ \
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iInt--; \
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} \
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} \
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else \
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{ \
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iInt = 0; \
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} \
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}
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//----------------------------------------------------------------------------
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#endif
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