ddnet/src/base/math.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com. */
#ifndef BASE_MATH_H
#define BASE_MATH_H
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#include <stdlib.h>
template <typename T>
inline T clamp(T val, T min, T max)
{
if(val < min)
return min;
if(val > max)
return max;
return val;
}
inline float sign(float f)
{
return f<0.0f?-1.0f:1.0f;
}
inline int round(float f)
{
if(f > 0)
return (int)(f+0.5f);
return (int)(f-0.5f);
}
template<typename T, typename TB>
inline T mix(const T a, const T b, TB amount)
{
return a + (b-a)*amount;
}
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inline float frandom() { return rand()/(float)(RAND_MAX); }
// float to fixed
inline int f2fx(float v) { return (int)(v*(float)(1<<10)); }
inline float fx2f(int v) { return v*(1.0f/(1<<10)); }
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inline int gcd(int a, int b)
{
while(b != 0)
{
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int c = a % b;
a = b;
b = c;
}
return a;
}
class fxp
{
int value;
public:
void set(int v) { value = v; }
int get() const { return value; }
fxp &operator = (int v) { value = v<<10; return *this; }
fxp &operator = (float v) { value = (int)(v*(float)(1<<10)); return *this; }
operator float() const { return value/(float)(1<<10); }
};
const float pi = 3.1415926535897932384626433f;
template <typename T> inline T min(T a, T b) { return a<b?a:b; }
template <typename T> inline T max(T a, T b) { return a>b?a:b; }
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template <typename T> inline T absolute(T a) { return a<T(0)?-a:a; }
#endif // BASE_MATH_H