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#ifndef _UTILS_H
#define _UTILS_H
#include "main.h"
#include <gfx/mat4.h>
#include <deque>
#include <vector>
#include <utility>
#define SIGN(x) ((x >= 0) ? 1 : -1)
#define MAX3(x, y, z) ( (x>y) ? ((x>z) ? x : z) : y )
#define MIN3(x, y, z) ( (x<y) ? ((x<z) ? x : z) : y )
typedef Vec4f rgbColor;
typedef Vec4f hsvColor;
// clamp vector's components each to +/- magnitude
void clamp_vec(Vec3f& vec, double max);
// return a random number between lo and hi inclusive
inline int rand_int(int lo, int hi)
{ return lo + (int)((hi-lo+1)*((double)rand()/(double)(RAND_MAX+1.0))); }
inline double rand_real(double lo, double hi)
{ return lo + (hi-lo)*((double)rand()/(double)(RAND_MAX+1.0)); }
inline Vec3f rand_vec3(double lo, double hi)
{ return Vec3f(rand_real(lo, hi), rand_real(lo, hi), rand_real(lo, hi)); }
// return a random int other than 'other'
int rand_other(int lo, int hi, int other);
// return the unit vector in the direction of v
inline Vec3f unit_vec(const Vec3f& v)
{ double n = norm(v); return (n == 0) ? v : v/n; }
// color space conversion
hsvColor rgb_to_hsv(const rgbColor& rgb);
rgbColor hsv_to_rgb(const hsvColor& hsv);
// a set of events and the time for them to occur
class Timer {
public:
typedef pair<int, double> Event;
deque<Event> events;
Timer() {}
// add an event that needs to be done at time 'when'
void add(int what, double when);
// checks if an event is ready, ie the current time (now) is past one
// of the times for an event.
bool is_ready(double now);
// clears all events
void clear();
// return the earliest-to-occur event. note: this (obviously) does not
// check that the current time is past the event's time.
int pop();
};
// a random variable which takes on a given value with a given probability
class RandVar {
public:
typedef pair<int, double> Event;
vector<Event> events;
double max_prob; // the sum of probabilities of all events
RandVar() : max_prob(0.0) {}
// add a value and it's probability weight to the set
void add(int val, double prob);
// change a value's probability weight. if val is not in the set,
// it is added.
void change(int val, double newprob);
// clear all events
void clear();
// return one of the values based on the weighted probability of each
// value. for example, if value '0' has probability 0.9, it will be
// returned 90% of the time.
int rand();
};
#endif // _UTILS_H
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