Method MultiplyMatrices

math32/matrix4.go:278–335

MultiplyMatrices computes a * b, storing the result in this matrix. Returns pointer to this updated matrix.

(a, b *Matrix4)

// MultiplyMatrices computes a * b, storing the result in this matrix.
// Returns pointer to this updated matrix.
func (m *Matrix4) MultiplyMatrices(a, b *Matrix4) *Matrix4 {

	a11 := a[0]
	a12 := a[4]
	a13 := a[8]
	a14 := a[12]
	a21 := a[1]
	a22 := a[5]
	a23 := a[9]
	a24 := a[13]
	a31 := a[2]
	a32 := a[6]
	a33 := a[10]
	a34 := a[14]
	a41 := a[3]
	a42 := a[7]
	a43 := a[11]
	a44 := a[15]

	b11 := b[0]
	b12 := b[4]
	b13 := b[8]
	b14 := b[12]
	b21 := b[1]
	b22 := b[5]
	b23 := b[9]
	b24 := b[13]
	b31 := b[2]
	b32 := b[6]
	b33 := b[10]
	b34 := b[14]
	b41 := b[3]
	b42 := b[7]
	b43 := b[11]
	b44 := b[15]

	m[0] = a11*b11 + a12*b21 + a13*b31 + a14*b41
	m[4] = a11*b12 + a12*b22 + a13*b32 + a14*b42
	m[8] = a11*b13 + a12*b23 + a13*b33 + a14*b43
	m[12] = a11*b14 + a12*b24 + a13*b34 + a14*b44

	m[1] = a21*b11 + a22*b21 + a23*b31 + a24*b41
	m[5] = a21*b12 + a22*b22 + a23*b32 + a24*b42
	m[9] = a21*b13 + a22*b23 + a23*b33 + a24*b43
	m[13] = a21*b14 + a22*b24 + a23*b34 + a24*b44

	m[2] = a31*b11 + a32*b21 + a33*b31 + a34*b41
	m[6] = a31*b12 + a32*b22 + a33*b32 + a34*b42
	m[10] = a31*b13 + a32*b23 + a33*b33 + a34*b43
	m[14] = a31*b14 + a32*b24 + a33*b34 + a34*b44

	m[3] = a41*b11 + a42*b21 + a43*b31 + a44*b41
	m[7] = a41*b12 + a42*b22 + a43*b32 + a44*b42
	m[11] = a41*b13 + a42*b23 + a43*b33 + a44*b43
	m[15] = a41*b14 + a42*b24 + a43*b34 + a44*b44

	return m
}