typedef struct Matrix Matrix;
struct Matrix {
	union {
		float e[16];
		float cr[4][4];
	};
};

typedef struct Vector4 Vector4;
struct Vector4 {
	union {
		float e[4];
		struct { float x, y, z, w; };
		struct { float r, g, b, a; };
	};
};

typedef struct Vector2 Vector2;
struct Vector2 {
	union {
		float e[2];
		struct { float x, y; };
		struct { float s, t; };
	};
};

Matrix identity(void);
Matrix frustum(float l, float r, float b, float t, float n, float f);
Matrix perspective(float fov, float aspect, float n, float f);
Matrix mulmat(Matrix a, Matrix b);
Vector4 mulmatvec(Matrix m, Vector4 v);
Matrix translation(float x, float y, float z);
Matrix rotationX(float a);
Matrix rotationY(float a);
Matrix rotationZ(float a);