utils.h

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// Software Rendering Pipeline (SRP) library
// Licensed under GNU GPLv3
 
#pragma once
 
#define _USE_MATH_DEFINES
#include <math.h>
 
#ifndef M_PI
    #define M_PI 3.14159265358979323846
#endif
 
#define MIN(a, b) ( (a) > (b) ? (b) : (a) )
#define MAX(a, b) ( (a) > (b) ? (a) : (b) )
 
#define CLAMP(min, max, value) \
    ( \
        (value < min) ? \
            (min) : \
            (value > max) ? \
                (max) : \
                (value) \
    )
 
#define FRACTIONAL(x) ( (x) - floor(x) )
 
#define EPSILON 1e-9
#define ROUGHLY_EQUAL(a, b) (fabs((a) - (b)) <= EPSILON)
#define ROUGHLY_ZERO(x) (fabs(x) <= EPSILON)
 
#define ROUGHLY_LESS_OR_EQUAL(a, b) ((a) <= (b) + EPSILON)
#define ROUGHLY_GREATER_OR_EQUAL(a, b) ((a) >= (b) - EPSILON)