chipmunk_types.h

/* Copyright (c) 2013 Scott Lembcke and Howling Moon Software
 * 
 * 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 CHIPMUNK_TYPES_H
#define CHIPMUNK_TYPES_H

#include <stdint.h>
#include <float.h>
#include <math.h>

#ifdef __APPLE__
   #include "TargetConditionals.h"
#endif

// Use CGTypes by default on iOS and Mac.
// Also enables usage of doubles on 64 bit.
// Performance is usually very comparable when the CPU cache is well utilised.
#if (TARGET_OS_IPHONE || TARGET_OS_MAC) && (!defined CP_USE_CGTYPES)
	#define CP_USE_CGTYPES 1
#endif

#if CP_USE_CGTYPES
	#if TARGET_OS_IPHONE
		#include <CoreGraphics/CGGeometry.h>
		#include <CoreGraphics/CGAffineTransform.h>
	#elif TARGET_OS_MAC
		#include <ApplicationServices/ApplicationServices.h>
	#endif
	
	#if defined(__LP64__) && __LP64__
		#define CP_USE_DOUBLES 1
	#else
		#define CP_USE_DOUBLES 0
	#endif
#endif

#ifndef CP_USE_DOUBLES
	// Use doubles by default for higher precision.
	#define CP_USE_DOUBLES 1
#endif

/// @defgroup basicTypes Basic Types
/// Most of these types can be configured at compile time.
/// @{

#if CP_USE_DOUBLES
/// Chipmunk's floating point type.
/// Can be reconfigured at compile time.
	typedef double cpFloat;
	#define cpfsqrt sqrt
	#define cpfsin sin
	#define cpfcos cos
	#define cpfacos acos
	#define cpfatan2 atan2
	#define cpfmod fmod
	#define cpfexp exp
	#define cpfpow pow
	#define cpffloor floor
	#define cpfceil ceil
	#define CPFLOAT_MIN DBL_MIN
#else
	typedef float cpFloat;
	#define cpfsqrt sqrtf
	#define cpfsin sinf
	#define cpfcos cosf
	#define cpfacos acosf
	#define cpfatan2 atan2f
	#define cpfmod fmodf
	#define cpfexp expf
	#define cpfpow powf
	#define cpffloor floorf
	#define cpfceil ceilf
	#define CPFLOAT_MIN FLT_MIN
#endif

#ifndef INFINITY
	#ifdef _MSC_VER
		union MSVC_EVIL_FLOAT_HACK
		{
			unsigned __int8 Bytes[4];
			float Value;
		};
		static union MSVC_EVIL_FLOAT_HACK INFINITY_HACK = {{0x00, 0x00, 0x80, 0x7F}};
		#define INFINITY (INFINITY_HACK.Value)
	#endif
	
	#ifdef __GNUC__
		#define INFINITY (__builtin_inf())
	#endif
	
	#ifndef INFINITY
		#define INFINITY (1e1000)
	#endif
#endif


#define CP_PI ((cpFloat)3.14159265358979323846264338327950288)


/// Return the max of two cpFloats.
static inline cpFloat cpfmax(cpFloat a, cpFloat b)
{
	return (a > b) ? a : b;
}

/// Return the min of two cpFloats.
static inline cpFloat cpfmin(cpFloat a, cpFloat b)
{
	return (a < b) ? a : b;
}

/// Return the absolute value of a cpFloat.
static inline cpFloat cpfabs(cpFloat f)
{
	return (f < 0) ? -f : f;
}

/// Clamp @c f to be between @c min and @c max.
static inline cpFloat cpfclamp(cpFloat f, cpFloat min, cpFloat max)
{
	return cpfmin(cpfmax(f, min), max);
}

/// Clamp @c f to be between 0 and 1.
static inline cpFloat cpfclamp01(cpFloat f)
{
	return cpfmax(0.0f, cpfmin(f, 1.0f));
}



/// Linearly interpolate (or extrapolate) between @c f1 and @c f2 by @c t percent.
static inline cpFloat cpflerp(cpFloat f1, cpFloat f2, cpFloat t)
{
	return f1*(1.0f - t) + f2*t;
}

/// Linearly interpolate from @c f1 to @c f2 by no more than @c d.
static inline cpFloat cpflerpconst(cpFloat f1, cpFloat f2, cpFloat d)
{
	return f1 + cpfclamp(f2 - f1, -d, d);
}

/// Hash value type.
#ifdef CP_HASH_VALUE_TYPE
	typedef CP_HASH_VALUE_TYPE cpHashValue;
#else
	typedef uintptr_t cpHashValue;
#endif

/// Type used internally to cache colliding object info for cpCollideShapes().
/// Should be at least 32 bits.
typedef uint32_t cpCollisionID;

// Oh C, how we love to define our own boolean types to get compiler compatibility
/// Chipmunk's boolean type.
#ifdef CP_BOOL_TYPE
	typedef CP_BOOL_TYPE cpBool;
#else
	typedef unsigned char cpBool;
#endif

#ifndef cpTrue
/// true value.
	#define cpTrue 1
#endif

#ifndef cpFalse
/// false value.
	#define cpFalse 0
#endif

#ifdef CP_DATA_POINTER_TYPE
	typedef CP_DATA_POINTER_TYPE cpDataPointer;
#else
/// Type used for user data pointers.
	typedef void * cpDataPointer;
#endif

#ifdef CP_COLLISION_TYPE_TYPE
	typedef CP_COLLISION_TYPE_TYPE cpCollisionType;
#else
/// Type used for cpSpace.collision_type.
	typedef uintptr_t cpCollisionType;
#endif

#ifdef CP_GROUP_TYPE
	typedef CP_GROUP_TYPE cpGroup;
#else
/// Type used for cpShape.group.
	typedef uintptr_t cpGroup;
#endif

#ifdef CP_BITMASK_TYPE
	typedef CP_BITMASK_TYPE cpBitmask;
#else
/// Type used for cpShapeFilter category and mask.
	typedef unsigned int cpBitmask;
#endif

#ifdef CP_TIMESTAMP_TYPE
	typedef CP_TIMESTAMP_TYPE cpTimestamp;
#else
/// Type used for various timestamps in Chipmunk.
	typedef unsigned int cpTimestamp;
#endif

#ifndef CP_NO_GROUP
/// Value for cpShape.group signifying that a shape is in no group.
	#define CP_NO_GROUP ((cpGroup)0)
#endif

#ifndef CP_ALL_CATEGORIES
/// Value for cpShape.layers signifying that a shape is in every layer.
	#define CP_ALL_CATEGORIES (~(cpBitmask)0)
#endif

#ifndef CP_WILDCARD_COLLISION_TYPE
/// cpCollisionType value internally reserved for hashing wildcard handlers.
	#define CP_WILDCARD_COLLISION_TYPE (~(cpCollisionType)0)
#endif

/// @}

// CGPoints are structurally the same, and allow
// easy interoperability with other Cocoa libraries
#if CP_USE_CGTYPES
	typedef CGPoint cpVect;
#else
/// Chipmunk's 2D vector type.
/// @addtogroup cpVect
	typedef struct cpVect{cpFloat x,y;} cpVect;
#endif

#if CP_USE_CGTYPES
	typedef CGAffineTransform cpTransform;
#else
	/// Column major affine transform.
	typedef struct cpTransform {
		cpFloat a, b, c, d, tx, ty;
	} cpTransform;
#endif

// NUKE
typedef struct cpMat2x2 {
	// Row major [[a, b][c d]]
	cpFloat a, b, c, d;
} cpMat2x2;

#endif