Vec2 :: struct {
    x, y: f32;

    zero :: () -> Vec2 { Vec2.{ x = 0.0, y = 0.0 } }

    add :: (self: Vec2, b: Vec2) -> Vec2 {
        Vec2.{ x = self.x + b.x, y = self.y + b.y }
    }

    sub :: (self: Vec2, b: Vec2) -> Vec2 {
        Vec2.{ x = self.x - b.x, y = self.y - b.y }
    }

    scale :: (self: Vec2, s: f32) -> Vec2 {
        Vec2.{ x = self.x * s, y = self.y * s }
    }

    dot :: (self: Vec2, b: Vec2) -> f32 {
        self.x * b.x + self.y * b.y
    }

    length :: (self: Vec2) -> f32 {
        sqrt(self.x * self.x + self.y * self.y)
    }

    normalize :: (self: Vec2) -> Vec2 {
        len := self.length();
        if len > 0.0 {
            return Vec2.{ x = self.x / len, y = self.y / len };
        }
        Vec2.zero()
    }

    lerp :: (self: Vec2, b: Vec2, t: f32) -> Vec2 {
        Vec2.{ x = self.x + (b.x - self.x) * t, y = self.y + (b.y - self.y) * t }
    }

    distance :: (self: Vec2, b: Vec2) -> f32 {
        self.sub(b).length()
    }

    negate :: (self: Vec2) -> Vec2 {
        Vec2.{ x = 0.0 - self.x, y = 0.0 - self.y }
    }

    equals :: (self: Vec2, b: Vec2) -> bool {
        self.x == b.x and self.y == b.y
    }
}