mirror of https://github.com/axmolengine/axmol.git
149 lines
4.3 KiB
C
149 lines
4.3 KiB
C
#ifndef GIM_MATH_H_INCLUDED
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#define GIM_MATH_H_INCLUDED
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/*! \file gim_math.h
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\author Francisco Leon Najera
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*/
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/*
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-----------------------------------------------------------------------------
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This source file is part of GIMPACT Library.
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For the latest info, see http://gimpact.sourceforge.net/
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Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
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email: projectileman@yahoo.com
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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 EITHER:
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(1) The GNU Lesser General Public License as published by the Free
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Software Foundation; either version 2.1 of the License, or (at
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your option) any later version. The text of the GNU Lesser
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General Public License is included with this library in the
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file GIMPACT-LICENSE-LGPL.TXT.
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(2) The BSD-style license that is included with this library in
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the file GIMPACT-LICENSE-BSD.TXT.
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(3) The zlib/libpng license that is included with this library in
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the file GIMPACT-LICENSE-ZLIB.TXT.
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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 files
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GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.
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-----------------------------------------------------------------------------
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*/
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#include "LinearMath/btScalar.h"
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#define GREAL btScalar
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#define GREAL2 double
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#define GINT int
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#define GUINT unsigned int
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#define GSHORT short
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#define GUSHORT unsigned short
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#define GINT64 long long
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#define GUINT64 unsigned long long
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#define G_PI 3.14159265358979f
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#define G_HALF_PI 1.5707963f
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//267948966
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#define G_TWO_PI 6.28318530f
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//71795864
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#define G_ROOT3 1.73205f
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#define G_ROOT2 1.41421f
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#define G_UINT_INFINITY 0xffffffff //!< A very very high value
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#define G_REAL_INFINITY FLT_MAX
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#define G_SIGN_BITMASK 0x80000000
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#define G_EPSILON SIMD_EPSILON
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enum GIM_SCALAR_TYPES
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{
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G_STYPE_REAL = 0,
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G_STYPE_REAL2,
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G_STYPE_SHORT,
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G_STYPE_USHORT,
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G_STYPE_INT,
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G_STYPE_UINT,
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G_STYPE_INT64,
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G_STYPE_UINT64
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};
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#define G_DEGTORAD(X) ((X)*3.1415926f / 180.0f)
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#define G_RADTODEG(X) ((X)*180.0f / 3.1415926f)
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//! Integer representation of a floating-point value.
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#define GIM_IR(x) ((GUINT&)(x))
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//! Signed integer representation of a floating-point value.
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#define GIM_SIR(x) ((GINT&)(x))
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//! Absolute integer representation of a floating-point value
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#define GIM_AIR(x) (GIM_IR(x) & 0x7fffffff)
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//! Floating-point representation of an integer value.
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#define GIM_FR(x) ((GREAL&)(x))
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#define GIM_MAX(a, b) (a < b ? b : a)
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#define GIM_MIN(a, b) (a > b ? b : a)
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#define GIM_MAX3(a, b, c) GIM_MAX(a, GIM_MAX(b, c))
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#define GIM_MIN3(a, b, c) GIM_MIN(a, GIM_MIN(b, c))
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#define GIM_IS_ZERO(value) (value < G_EPSILON && value > -G_EPSILON)
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#define GIM_IS_NEGATIVE(value) (value <= -G_EPSILON)
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#define GIM_IS_POSISITVE(value) (value >= G_EPSILON)
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#define GIM_NEAR_EQUAL(v1, v2) GIM_IS_ZERO((v1 - v2))
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///returns a clamped number
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#define GIM_CLAMP(number, minval, maxval) (number < minval ? minval : (number > maxval ? maxval : number))
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#define GIM_GREATER(x, y) btFabs(x) > (y)
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///Swap numbers
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#define GIM_SWAP_NUMBERS(a, b) \
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{ \
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a = a + b; \
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b = a - b; \
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a = a - b; \
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}
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#define GIM_INV_SQRT(va, isva) \
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{ \
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if (va <= 0.0000001f) \
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{ \
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isva = G_REAL_INFINITY; \
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} \
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else \
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{ \
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GREAL _x = va * 0.5f; \
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GUINT _y = 0x5f3759df - (GIM_IR(va) >> 1); \
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isva = GIM_FR(_y); \
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isva = isva * (1.5f - (_x * isva * isva)); \
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} \
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}
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#define GIM_SQRT(va, sva) \
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{ \
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GIM_INV_SQRT(va, sva); \
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sva = 1.0f / sva; \
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}
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//! Computes 1.0f / sqrtf(x). Comes from Quake3. See http://www.magic-software.com/3DGEDInvSqrt.html
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inline GREAL gim_inv_sqrt(GREAL f)
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{
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GREAL r;
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GIM_INV_SQRT(f, r);
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return r;
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}
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inline GREAL gim_sqrt(GREAL f)
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{
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GREAL r;
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GIM_SQRT(f, r);
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return r;
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}
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#endif // GIM_MATH_H_INCLUDED
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