#ifndef __UTIL_H__
# define __UTIL_H__

#include <num/num.h>
#include <num/vec.h>
using namespace libnum;

/* A platform rectangle, aligned with the camera's view */
struct prect
{
    vec3 nl, nr; /* Near left and near right points */
    vec3 fl, fr; /* Far left and far right points */
};

/* Approximations of the sine and cosine of an angle in radians. */
num num_cos(num a);
num num_sin(num a);

/* Clamp a num between two bounds. */
num num_clamp(num t, num lower_bound, num upper_bound);

/* Random num between 0 and 1. */
num num_rand(void);

/* String representation of various objects (static strings rotating; can use
   up to 8 of them at once). */
char const *str(num x);
char const *str(vec2 u);
char const *str(vec3 u);

/* Rotate v by θ around z, when rotator=(cos(θ), sin(θ)) */
vec3 vec_rotate_around_z(vec3 v, vec2 rotator);

#define RGB24(hex) \
    (((hex & 0xf80000) >> 8) | \
     ((hex & 0x00fc00) >> 5) | \
     ((hex & 0x0000f8) >> 3))

#endif /* __UTIL_H__ */