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Bart van Strien
2011-10-12 21:49:04 +02:00
parent cb6bde5ad7
commit bc2dd6f75b
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src/modules/physics/box2d/Source/Common/b2Settings.h
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/*
* Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
*
* 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 <assert.h>
#include <common/Exception.h>
#include <cmath>
#define B2_NOT_USED(x) x
//#define b2Assert(A) assert(A)
#define b2Assert(A) {if(!(A)) throw love::Exception(1, #A);}
// need to include NDS jtypes.h instead of
// usual typedefs because NDS jtypes defines
// them slightly differently, oh well.
#ifdef TARGET_IS_NDS
#include "jtypes.h"
#else
typedef signed char int8;
typedef signed short int16;
typedef signed int int32;
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint32;
#endif
#ifdef TARGET_FLOAT32_IS_FIXED
#include "Fixed.h"
typedef Fixed float32;
#define B2_FLT_MAX FIXED_MAX
#define B2_FLT_EPSILON FIXED_EPSILON
#define B2FORCE_SCALE(x) ((x)<<7)
#define B2FORCE_INV_SCALE(x) ((x)>>7)
#else
typedef float float32;
#define B2_FLT_MAX FLT_MAX
#define B2_FLT_EPSILON FLT_EPSILON
#define B2FORCE_SCALE(x) (x)
#define B2FORCE_INV_SCALE(x) (x)
#endif
const float32 b2_pi = 3.14159265359f;
/// @file
/// Global tuning constants based on meters-kilograms-seconds (MKS) units.
///
// Collision
const int32 b2_maxManifoldPoints = 2;
const int32 b2_maxPolygonVertices = 8;
const int32 b2_maxProxies = 2048; // this must be a power of two
const int32 b2_maxPairs = 8 * b2_maxProxies; // this must be a power of two
// Dynamics
/// A small length used as a collision and constraint tolerance. Usually it is
/// chosen to be numerically significant, but visually insignificant.
const float32 b2_linearSlop = 0.005f; // 0.5 cm
/// A small angle used as a collision and constraint tolerance. Usually it is
/// chosen to be numerically significant, but visually insignificant.
const float32 b2_angularSlop = 2.0f / 180.0f * b2_pi; // 2 degrees
/// Continuous collision detection (CCD) works with core, shrunken shapes. This is the
/// amount by which shapes are automatically shrunk to work with CCD. This must be
/// larger than b2_linearSlop.
const float32 b2_toiSlop = 8.0f * b2_linearSlop;
/// Maximum number of contacts to be handled to solve a TOI island.
const int32 b2_maxTOIContactsPerIsland = 32;
/// A velocity threshold for elastic collisions. Any collision with a relative linear
/// velocity below this threshold will be treated as inelastic.
const float32 b2_velocityThreshold = 1.0f; // 1 m/s
/// The maximum linear position correction used when solving constraints. This helps to
/// prevent overshoot.
const float32 b2_maxLinearCorrection = 0.2f; // 20 cm
/// The maximum angular position correction used when solving constraints. This helps to
/// prevent overshoot.
const float32 b2_maxAngularCorrection = 8.0f / 180.0f * b2_pi; // 8 degrees
/// 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.
#ifdef TARGET_FLOAT32_IS_FIXED
const float32 b2_maxLinearVelocity = 100.0f;
#else
const float32 b2_maxLinearVelocity = 200.0f;
const float32 b2_maxLinearVelocitySquared = b2_maxLinearVelocity * b2_maxLinearVelocity;
#endif
/// 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.
const float32 b2_maxAngularVelocity = 250.0f;
#ifndef TARGET_FLOAT32_IS_FIXED
const float32 b2_maxAngularVelocitySquared = b2_maxAngularVelocity * b2_maxAngularVelocity;
#endif
/// 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.
const float32 b2_contactBaumgarte = 0.2f;
// Sleep
/// The time that a body must be still before it will go to sleep.
const float32 b2_timeToSleep = 0.5f; // half a second
/// A body cannot sleep if its linear velocity is above this tolerance.
const float32 b2_linearSleepTolerance = 0.01f; // 1 cm/s
/// A body cannot sleep if its angular velocity is above this tolerance.
const float32 b2_angularSleepTolerance = 2.0f / 180.0f; // 2 degrees/s
// Memory Allocation
/// The current number of bytes allocated through b2Alloc.
extern int32 b2_byteCount;
/// 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);
/// 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;
/// Friction mixing law. Feel free to customize this.
inline float32 b2MixFriction(float32 friction1, float32 friction2)
{
return sqrtf(friction1 * friction2);
}
/// Restitution mixing law. Feel free to customize this.
inline float32 b2MixRestitution(float32 restitution1, float32 restitution2)
{
return restitution1 > restitution2 ? restitution1 : restitution2;
}
#endif