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love-svg / src / common / math.h

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/**
* Copyright (c) 2006-2011 LOVE Development Team
* 
* 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 LOVE_MATH_H
#define LOVE_MATH_H

#include <climits> // for CHAR_BIT

/* Definitions of useful mathematical constants
 * M_E        - e
 * M_LOG2E    - log2(e)
 * M_LOG10E   - log10(e)
 * M_LN2      - ln(2)
 * M_LN10     - ln(10)
 * M_PI       - pi
 * M_PI_2     - pi/2
 * M_PI_4     - pi/4
 * M_1_PI     - 1/pi
 * M_2_PI     - 2/pi
 * M_2_SQRTPI - 2/sqrt(pi)
 * M_SQRT2    - sqrt(2)
 * M_SQRT1_2  - 1/sqrt(2)
 */

#define LOVE_M_E        2.71828182845904523536
#define LOVE_M_LOG2E    1.44269504088896340736
#define LOVE_M_LOG10E   0.434294481903251827651
#define LOVE_M_LN2      0.693147180559945309417
#define LOVE_M_LN10     2.30258509299404568402
#define LOVE_M_PI       3.14159265358979323846
#define LOVE_M_PI_2     1.57079632679489661923
#define LOVE_M_PI_4     0.785398163397448309616
#define LOVE_M_1_PI     0.318309886183790671538
#define LOVE_M_2_PI     0.636619772367581343076
#define LOVE_M_2_SQRTPI 1.12837916709551257390
#define LOVE_M_SQRT2    1.41421356237309504880
#define LOVE_M_SQRT1_2  0.707106781186547524401
#define LOVE_M_TORAD	(float)(LOVE_M_PI/180.0)
#define LOVE_M_TODEG    (float)(180.0/LOVE_M_PI)
#define LOVE_TORAD(x)	(float)(x*LOVE_M_TORAD)
#define LOVE_TODEG(x)	(float)(x*LOVE_M_TODEG)

namespace love
{

struct vertex
{
	unsigned char r, g, b, a;
	float x, y;
	float s, t;
};

inline int next_p2(int x)
{
	x += (x == 0);
	x--;
	for (unsigned int i = 1; i < sizeof(int)*CHAR_BIT; i <<= 1) x |= x >> i;
	return ++x;
}

inline float next_p2(float x)
{
	return static_cast<float>(next_p2(static_cast<int>(x)));
}

} // love

#endif // LOVE_MATH_H