reactos/dll/opengl/mesa/fixed.h

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