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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
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/* $Id: fixed.h,v 1.2 1996/10/01 03:31:04 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 2.0
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* Copyright (C) 1995-1996 Brian Paul
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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*
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* Revision 1.1 1996/09/13 01:38:16 brianp
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* Initial revision
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*
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*/
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#ifndef FIXED_H
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#define FIXED_H
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typedef int GLfixed;
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#define FIXED_ONE 0x00000800
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#define FIXED_HALF 0x00000400
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#define FIXED_FRAC_MASK 0x000007FF
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#define FIXED_INT_MASK (~FIXED_FRAC_MASK)
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#define FIXED_EPSILON 1
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#define FIXED_SCALE 2048.0f
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#define FIXED_SHIFT 11
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#define FloatToFixed(X) ((GLfixed) ((X) * FIXED_SCALE))
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#define IntToFixed(I) ((I) << FIXED_SHIFT)
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#define FixedToInt(X) ((X) >> FIXED_SHIFT)
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#define FixedToUns(X) (((unsigned int)(X)) >> 11)
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#define FixedCeil(X) (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)
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#define FixedFloor(X) ((X) & FIXED_INT_MASK)
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/* 0.00048828125 = 1/FIXED_SCALE */
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#define FixedToFloat(X) ((X) * 0.00048828125f)
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#define PosFloatToFixed(X) FloatToFixed(X)
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#define SignedFloatToFixed(X) FloatToFixed(X)
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#endif
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