156 lines
		
	
	
		
			5.2 KiB
		
	
	
	
		
			C
		
	
	
	
			
		
		
	
	
			156 lines
		
	
	
		
			5.2 KiB
		
	
	
	
		
			C
		
	
	
	
| /*
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| * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
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| *
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| * This software is provided 'as-is', without any express or implied
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| * warranty.  In no event will the authors be held liable for any damages
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| * arising from the use of this software.
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| * Permission is granted to anyone to use this software for any purpose,
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| * including commercial applications, and to alter it and redistribute it
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| * freely, subject to the following restrictions:
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| * 1. The origin of this software must not be misrepresented; you must not
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| * claim that you wrote the original software. If you use this software
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| * in a product, an acknowledgment in the product documentation would be
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| * appreciated but is not required.
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| * 2. Altered source versions must be plainly marked as such, and must not be
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| * misrepresented as being the original software.
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| * 3. This notice may not be removed or altered from any source distribution.
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| */
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| 
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| #ifndef B2_SETTINGS_H
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| #define B2_SETTINGS_H
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| 
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| #include <stddef.h>
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| #include <assert.h>
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| #include <float.h>
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| 
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| #if !defined(NDEBUG)
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| 	#define b2DEBUG
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| #endif
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| 
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| #define B2_NOT_USED(x) ((void)(x))
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| #define b2Assert(A) assert(A)
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| 
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| typedef signed char	int8;
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| typedef signed short int16;
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| typedef signed int int32;
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| typedef unsigned char uint8;
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| typedef unsigned short uint16;
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| typedef unsigned int uint32;
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| typedef float float32;
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| typedef double float64;
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| 
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| #define	b2_maxFloat		FLT_MAX
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| #define	b2_epsilon		FLT_EPSILON
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| #define b2_pi			3.14159265359f
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| 
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| /// @file
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| /// Global tuning constants based on meters-kilograms-seconds (MKS) units.
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| ///
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| 
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| // Collision
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| 
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| /// The maximum number of contact points between two convex shapes. Do
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| /// not change this value.
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| #define b2_maxManifoldPoints	2
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| 
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| /// The maximum number of vertices on a convex polygon. You cannot increase
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| /// this too much because b2BlockAllocator has a maximum object size.
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| #define b2_maxPolygonVertices	8
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| 
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| /// This is used to fatten AABBs in the dynamic tree. This allows proxies
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| /// to move by a small amount without triggering a tree adjustment.
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| /// This is in meters.
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| #define b2_aabbExtension		0.1f
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| 
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| /// This is used to fatten AABBs in the dynamic tree. This is used to predict
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| /// the future position based on the current displacement.
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| /// This is a dimensionless multiplier.
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| #define b2_aabbMultiplier		2.0f
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| 
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| /// A small length used as a collision and constraint tolerance. Usually it is
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| /// chosen to be numerically significant, but visually insignificant.
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| #define b2_linearSlop			0.005f
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| 
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| /// A small angle used as a collision and constraint tolerance. Usually it is
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| /// chosen to be numerically significant, but visually insignificant.
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| #define b2_angularSlop			(2.0f / 180.0f * b2_pi)
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| 
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| /// The radius of the polygon/edge shape skin. This should not be modified. Making
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| /// this smaller means polygons will have an insufficient buffer for continuous collision.
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| /// Making it larger may create artifacts for vertex collision.
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| #define b2_polygonRadius		(2.0f * b2_linearSlop)
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| 
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| /// Maximum number of sub-steps per contact in continuous physics simulation.
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| #define b2_maxSubSteps			8
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| 
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| 
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| // Dynamics
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| 
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| /// Maximum number of contacts to be handled to solve a TOI impact.
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| #define b2_maxTOIContacts			32
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| 
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| /// A velocity threshold for elastic collisions. Any collision with a relative linear
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| /// velocity below this threshold will be treated as inelastic.
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| #define b2_velocityThreshold		1.0f
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| 
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| /// The maximum linear position correction used when solving constraints. This helps to
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| /// prevent overshoot.
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| #define b2_maxLinearCorrection		0.2f
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| 
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| /// The maximum angular position correction used when solving constraints. This helps to
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| /// prevent overshoot.
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| #define b2_maxAngularCorrection		(8.0f / 180.0f * b2_pi)
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| 
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| /// The maximum linear velocity of a body. This limit is very large and is used
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| /// to prevent numerical problems. You shouldn't need to adjust this.
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| #define b2_maxTranslation			2.0f
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| #define b2_maxTranslationSquared	(b2_maxTranslation * b2_maxTranslation)
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| 
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| /// The maximum angular velocity of a body. This limit is very large and is used
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| /// to prevent numerical problems. You shouldn't need to adjust this.
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| #define b2_maxRotation				(0.5f * b2_pi)
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| #define b2_maxRotationSquared		(b2_maxRotation * b2_maxRotation)
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| 
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| /// This scale factor controls how fast overlap is resolved. Ideally this would be 1 so
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| /// that overlap is removed in one time step. However using values close to 1 often lead
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| /// to overshoot.
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| #define b2_baumgarte				0.2f
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| #define b2_toiBaugarte				0.75f
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| 
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| 
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| // Sleep
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| 
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| /// The time that a body must be still before it will go to sleep.
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| #define b2_timeToSleep				0.5f
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| 
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| /// A body cannot sleep if its linear velocity is above this tolerance.
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| #define b2_linearSleepTolerance		0.01f
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| 
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| /// A body cannot sleep if its angular velocity is above this tolerance.
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| #define b2_angularSleepTolerance	(2.0f / 180.0f * b2_pi)
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| 
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| // Memory Allocation
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| 
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| /// Implement this function to use your own memory allocator.
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| void* b2Alloc(int32 size);
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| 
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| /// If you implement b2Alloc, you should also implement this function.
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| void b2Free(void* mem);
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| 
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| /// Logging function.
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| void b2Log(const char* string, ...);
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| 
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| /// Version numbering scheme.
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| /// See http://en.wikipedia.org/wiki/Software_versioning
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| struct b2Version
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| {
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| 	int32 major;		///< significant changes
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| 	int32 minor;		///< incremental changes
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| 	int32 revision;		///< bug fixes
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| };
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| 
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| /// Current version.
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| extern b2Version b2_version;
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| 
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| #endif
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