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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. */ /* * $Log: fixed.h,v $ * Revision 1.2 1996/10/01 03:31:04 brianp * added FixedToDepth() macro * * 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) #if DEPTH_BITS==16 /* use fixed-point interpolation */ #define FixedToDepth(I) ((I) >> FIXED_SHIFT) #else /* don't really use fixed-point */ #define FixedToDepth(I) (I) #endif #endif
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.