1 #ifndef GIM_MATH_H_INCLUDED
2 #define GIM_MATH_H_INCLUDED
4 \author Francisco Leon Najera
7 -----------------------------------------------------------------------------
8 This source file is part of GIMPACT Library.
10 For the latest info, see http://gimpact.sourceforge.net/
12 Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
13 email: projectileman@yahoo.com
15 This library is free software; you can redistribute it and/or
16 modify it under the terms of EITHER:
17 (1) The GNU Lesser General Public License as published by the Free
18 Software Foundation; either version 2.1 of the License, or (at
19 your option) any later version. The text of the GNU Lesser
20 General Public License is included with this library in the
21 file GIMPACT-LICENSE-LGPL.TXT.
22 (2) The BSD-style license that is included with this library in
23 the file GIMPACT-LICENSE-BSD.TXT.
24 (3) The zlib/libpng license that is included with this library in
25 the file GIMPACT-LICENSE-ZLIB.TXT.
27 This library is distributed in the hope that it will be useful,
28 but WITHOUT ANY WARRANTY; without even the implied warranty of
29 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files
30 GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.
32 -----------------------------------------------------------------------------
35 #include "LinearMath/btScalar.h"
37 #define GREAL btScalar
40 #define GUINT unsigned int
42 #define GUSHORT unsigned short
43 #define GINT64 long long
44 #define GUINT64 unsigned long long
46 #define G_PI 3.14159265358979f
47 #define G_HALF_PI 1.5707963f
49 #define G_TWO_PI 6.28318530f
51 #define G_ROOT3 1.73205f
52 #define G_ROOT2 1.41421f
53 #define G_UINT_INFINITY 0xffffffff //!< A very very high value
54 #define G_REAL_INFINITY FLT_MAX
55 #define G_SIGN_BITMASK 0x80000000
56 #define G_EPSILON SIMD_EPSILON
70 #define G_DEGTORAD(X) ((X)*3.1415926f / 180.0f)
71 #define G_RADTODEG(X) ((X)*180.0f / 3.1415926f)
73 //! Integer representation of a floating-point value.
74 #define GIM_IR(x) ((GUINT&)(x))
76 //! Signed integer representation of a floating-point value.
77 #define GIM_SIR(x) ((GINT&)(x))
79 //! Absolute integer representation of a floating-point value
80 #define GIM_AIR(x) (GIM_IR(x) & 0x7fffffff)
82 //! Floating-point representation of an integer value.
83 #define GIM_FR(x) ((GREAL&)(x))
85 #define GIM_MAX(a, b) (a < b ? b : a)
86 #define GIM_MIN(a, b) (a > b ? b : a)
88 #define GIM_MAX3(a, b, c) GIM_MAX(a, GIM_MAX(b, c))
89 #define GIM_MIN3(a, b, c) GIM_MIN(a, GIM_MIN(b, c))
91 #define GIM_IS_ZERO(value) (value < G_EPSILON && value > -G_EPSILON)
93 #define GIM_IS_NEGATIVE(value) (value <= -G_EPSILON)
95 #define GIM_IS_POSISITVE(value) (value >= G_EPSILON)
97 #define GIM_NEAR_EQUAL(v1, v2) GIM_IS_ZERO((v1 - v2))
99 ///returns a clamped number
100 #define GIM_CLAMP(number, minval, maxval) (number < minval ? minval : (number > maxval ? maxval : number))
102 #define GIM_GREATER(x, y) btFabs(x) > (y)
105 #define GIM_SWAP_NUMBERS(a, b) \
112 #define GIM_INV_SQRT(va, isva) \
114 if (va <= 0.0000001f) \
116 isva = G_REAL_INFINITY; \
120 GREAL _x = va * 0.5f; \
121 GUINT _y = 0x5f3759df - (GIM_IR(va) >> 1); \
123 isva = isva * (1.5f - (_x * isva * isva)); \
127 #define GIM_SQRT(va, sva) \
129 GIM_INV_SQRT(va, sva); \
133 //! Computes 1.0f / sqrtf(x). Comes from Quake3. See http://www.magic-software.com/3DGEDInvSqrt.html
134 inline GREAL gim_inv_sqrt(GREAL f)
141 inline GREAL gim_sqrt(GREAL f)
148 #endif // GIM_MATH_H_INCLUDED