#ifndef HANDMADE_MATH_H
#define HANDMADE_MATH_H

/* TODO: Make these static. */
struct v2 {
    float x, y;
    float e[2];
};

struct v2 v2(float x, float y)
{
    struct v2 result;

    result.x = x;
    result.y = y;

    return result;
}

struct v2 v2_multiply(float a, struct v2 b)
{
    struct v2 result;

    result.x = a * b.x;
    result.y = a * b.y;

    return result;
}

struct v2 v2_unary(struct v2 a)
{
    struct v2 result;

    result.x = -a.x;
    result.y = -a.y;

    return result;
}

struct v2 v2_add(struct v2 a, struct v2 b)
{
    struct v2 result;

    result.x = a.x + b.x;
    result.y = a.y + b.y;

    return result;
}

struct v2 v2_subtract(struct v2 a, struct v2 b)
{
    struct v2 result;

    result.x = a.x - b.x;
    result.y = a.y - b.y;

    return result;
}

float square(float a)
{
    float result;

    result = a * a;

    return result;
}

float inner_product(struct v2 a, struct v2 b)
{
    float result = a.x*b.x + a.y*b.y;
    return result;
}

float length_sq(struct v2 a)
{
    float result = inner_product(a, a);
    return result;
}

#endif