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authorchai <chaifix@163.com>2019-03-19 23:06:27 +0800
committerchai <chaifix@163.com>2019-03-19 23:06:27 +0800
commit1497dccd63a84b7ee2b229b1ad9c5c02718f2a78 (patch)
treef8d1bff50da13e126d08c7345653e002e293202d /Source/3rdParty/Box2D/Common/b2Settings.h
parent5e2a973516e0729b225da9de0b03015dc5854ac4 (diff)
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-/*
-* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
-*
-* This software is provided 'as-is', without any express or implied
-* warranty. In no event will the authors be held liable for any damages
-* arising from the use of this software.
-* Permission is granted to anyone to use this software for any purpose,
-* including commercial applications, and to alter it and redistribute it
-* freely, subject to the following restrictions:
-* 1. The origin of this software must not be misrepresented; you must not
-* claim that you wrote the original software. If you use this software
-* in a product, an acknowledgment in the product documentation would be
-* appreciated but is not required.
-* 2. Altered source versions must be plainly marked as such, and must not be
-* misrepresented as being the original software.
-* 3. This notice may not be removed or altered from any source distribution.
-*/
-
-#ifndef B2_SETTINGS_H
-#define 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)
-
-typedef signed char int8;
-typedef signed short int16;
-typedef signed int int32;
-typedef unsigned char uint8;
-typedef unsigned short uint16;
-typedef unsigned int uint32;
-typedef float float32;
-typedef double float64;
-
-#define b2_maxFloat FLT_MAX
-#define b2_epsilon FLT_EPSILON
-#define b2_pi 3.14159265359f
-
-/// @file
-/// Global tuning constants based on meters-kilograms-seconds (MKS) units.
-///
-
-// Collision
-
-/// The maximum number of contact points between two convex shapes. Do
-/// not change this value.
-#define b2_maxManifoldPoints 2
-
-/// The maximum number of vertices on a convex polygon. You cannot increase
-/// this too much because b2BlockAllocator has a maximum object size.
-#define b2_maxPolygonVertices 8
-
-/// This is used to fatten AABBs in the dynamic tree. This allows proxies
-/// to move by a small amount without triggering a tree adjustment.
-/// This is in meters.
-#define b2_aabbExtension 0.1f
-
-/// This is used to fatten AABBs in the dynamic tree. This is used to predict
-/// the future position based on the current displacement.
-/// This is a dimensionless multiplier.
-#define b2_aabbMultiplier 2.0f
-
-/// A small length used as a collision and constraint tolerance. Usually it is
-/// chosen to be numerically significant, but visually insignificant.
-#define b2_linearSlop 0.005f
-
-/// A small angle used as a collision and constraint tolerance. Usually it is
-/// chosen to be numerically significant, but visually insignificant.
-#define b2_angularSlop (2.0f / 180.0f * b2_pi)
-
-/// The radius of the polygon/edge shape skin. This should not be modified. Making
-/// this smaller means polygons will have an insufficient buffer for continuous collision.
-/// Making it larger may create artifacts for vertex collision.
-#define b2_polygonRadius (2.0f * b2_linearSlop)
-
-/// Maximum number of sub-steps per contact in continuous physics simulation.
-#define b2_maxSubSteps 8
-
-
-// Dynamics
-
-/// Maximum number of contacts to be handled to solve a TOI impact.
-#define b2_maxTOIContacts 32
-
-/// A velocity threshold for elastic collisions. Any collision with a relative linear
-/// velocity below this threshold will be treated as inelastic.
-#define b2_velocityThreshold 1.0f
-
-/// The maximum linear position correction used when solving constraints. This helps to
-/// prevent overshoot.
-#define b2_maxLinearCorrection 0.2f
-
-/// The maximum angular position correction used when solving constraints. This helps to
-/// prevent overshoot.
-#define b2_maxAngularCorrection (8.0f / 180.0f * b2_pi)
-
-/// The maximum linear velocity of a body. This limit is very large and is used
-/// to prevent numerical problems. You shouldn't need to adjust this.
-#define b2_maxTranslation 2.0f
-#define b2_maxTranslationSquared (b2_maxTranslation * b2_maxTranslation)
-
-/// The maximum angular velocity of a body. This limit is very large and is used
-/// to prevent numerical problems. You shouldn't need to adjust this.
-#define b2_maxRotation (0.5f * b2_pi)
-#define b2_maxRotationSquared (b2_maxRotation * b2_maxRotation)
-
-/// This scale factor controls how fast overlap is resolved. Ideally this would be 1 so
-/// that overlap is removed in one time step. However using values close to 1 often lead
-/// to overshoot.
-#define b2_baumgarte 0.2f
-#define b2_toiBaugarte 0.75f
-
-
-// Sleep
-
-/// The time that a body must be still before it will go to sleep.
-#define b2_timeToSleep 0.5f
-
-/// A body cannot sleep if its linear velocity is above this tolerance.
-#define b2_linearSleepTolerance 0.01f
-
-/// A body cannot sleep if its angular velocity is above this tolerance.
-#define b2_angularSleepTolerance (2.0f / 180.0f * b2_pi)
-
-// Memory Allocation
-
-/// Implement this function to use your own memory allocator.
-void* b2Alloc(int32 size);
-
-/// If you implement b2Alloc, you should also implement this function.
-void b2Free(void* mem);
-
-/// Logging function.
-void b2Log(const char* string, ...);
-
-/// Version numbering scheme.
-/// See http://en.wikipedia.org/wiki/Software_versioning
-struct b2Version
-{
- int32 major; ///< significant changes
- int32 minor; ///< incremental changes
- int32 revision; ///< bug fixes
-};
-
-/// Current version.
-extern b2Version b2_version;
-
-#endif