package gl

import "math"

const deg = math.Pi / 180

// The type Mat4 represents a double precision 4x4 matrix.

type Mat4 [4][4]float64

// An identity matrix

var Identity Mat4 = [4][4]float64{[4]float64{1, 0, 0, 0}, [4]float64{0, 1, 0, 0}, [4]float64{0, 0, 1, 0}, [4]float64{0, 0, 0, 1}}

func mul4(a, b Mat4) Mat4 {

}

// Mul4 multiplies an arbitrary number of Mat4 matrices.

func Mul4(a ...Mat4) Mat4 {

}

// Apply4 applies the matrix to a 4-element vector

func (m Mat4) Apply4 (v [4]float64) [4]float64 {

}

// Apply3 applies the matrix to a 3-element vector

func (m Mat4) Apply3 (v [3]float64) [3]float64 {

}

// RotZ returns a rotation matrix rotating r degrees around the z axis.

func RotZ(r float64) Mat4 {

}

// RotX returns a rotation matrix rotating r degrees around the x axis.

func RotX(r float64) Mat4 {

}

// RotY returns a rotation matrix rotating r degrees around the y axis.

func RotY(r float64) Mat4 {

}

// Translate returns a translation matrix

func Translate(x, y, z float64) Mat4 {

}

// Frustum returns a projection matrix similar to gluPerspective. The arguments are field of view angle in degrees, aspect ratio and near and far z clipping plane distance.

func Frustum(fov, aspect, zNear, zFar float64) Mat4 {

}

// Scale returns a scale matrix

func Scale(x, y, z float64) Mat4 {

}

//calculate the inverse Mat4 of original Mat4

func (m Mat4) Inverse() Mat4 {

}

//calculate the transpose Mat4 of original Mat4

func (m Mat4) Transpose() Mat4 {

}