b2_common.h

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// MIT License
 
// Copyright (c) 2019 Erin Catto
 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#ifndef B2_COMMON_H
#define B2_COMMON_H
 
#include "b2_settings.h"
 
#include <stddef.h>
#include <assert.h>
#include <float.h>
 
#if !defined(NDEBUG)
    #define b2DEBUG
#endif
 
#define B2_NOT_USED(x) ((void)(x))
#define b2Assert(A) assert(A)
 
#define b2_maxFloat     FLT_MAX
#define b2_epsilon      FLT_EPSILON
#define b2_pi           3.14159265359f
 
 
// Collision
 
#define b2_maxManifoldPoints    2
 
#define b2_aabbExtension        (0.1f * b2_lengthUnitsPerMeter)
 
#define b2_aabbMultiplier       4.0f
 
#define b2_linearSlop           (0.005f * b2_lengthUnitsPerMeter)
 
#define b2_angularSlop          (2.0f / 180.0f * b2_pi)
 
#define b2_polygonRadius        (2.0f * b2_linearSlop)
 
#define b2_maxSubSteps          8
 
 
// Dynamics
 
#define b2_maxTOIContacts           32
 
#define b2_maxLinearCorrection      (0.2f * b2_lengthUnitsPerMeter)
 
#define b2_maxAngularCorrection     (8.0f / 180.0f * b2_pi)
 
#define b2_maxTranslation           (2.0f * b2_lengthUnitsPerMeter)
#define b2_maxTranslationSquared    (b2_maxTranslation * b2_maxTranslation)
 
#define b2_maxRotation              (0.5f * b2_pi)
#define b2_maxRotationSquared       (b2_maxRotation * b2_maxRotation)
 
#define b2_baumgarte                0.2f
#define b2_toiBaumgarte             0.75f
 
 
// Sleep
 
#define b2_timeToSleep              0.5f
 
#define b2_linearSleepTolerance     (0.01f * b2_lengthUnitsPerMeter)
 
#define b2_angularSleepTolerance    (2.0f / 180.0f * b2_pi)
 
void b2OpenDump(const char* fileName);
void b2Dump(const char* string, ...);
void b2CloseDump();
 
struct b2Version
{
    int32 major;        
    int32 minor;        
    int32 revision;     
};
 
extern B2_API b2Version b2_version;
 
#endif