ReactOS  0.4.14-dev-599-g2d4d3f5
fixed.h
Go to the documentation of this file.
1 /* $Id: fixed.h,v 1.2 1996/10/01 03:31:04 brianp Exp $ */
2 
3 /*
4  * Mesa 3-D graphics library
5  * Version: 2.0
6  * Copyright (C) 1995-1996 Brian Paul
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public
19  * License along with this library; if not, write to the Free
20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  */
22 
23 
24 /*
25  *
26  * Revision 1.1 1996/09/13 01:38:16 brianp
27  * Initial revision
28  *
29  */
30 
31 
32 #ifndef FIXED_H
33 #define FIXED_H
34 
35 
36 typedef int GLfixed;
37 
38 #define FIXED_ONE 0x00000800
39 #define FIXED_HALF 0x00000400
40 #define FIXED_FRAC_MASK 0x000007FF
41 #define FIXED_INT_MASK (~FIXED_FRAC_MASK)
42 #define FIXED_EPSILON 1
43 #define FIXED_SCALE 2048.0f
44 #define FIXED_SHIFT 11
45 #define FloatToFixed(X) ((GLfixed) ((X) * FIXED_SCALE))
46 #define IntToFixed(I) ((I) << FIXED_SHIFT)
47 #define FixedToInt(X) ((X) >> FIXED_SHIFT)
48 #define FixedToUns(X) (((unsigned int)(X)) >> 11)
49 #define FixedCeil(X) (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK)
50 #define FixedFloor(X) ((X) & FIXED_INT_MASK)
51 /* 0.00048828125 = 1/FIXED_SCALE */
52 #define FixedToFloat(X) ((X) * 0.00048828125f)
53 #define PosFloatToFixed(X) FloatToFixed(X)
54 #define SignedFloatToFixed(X) FloatToFixed(X)
55 
56 
57 #endif
int GLfixed
Definition: fixed.h:36