Add conversion functions between square matrices.

This commit is contained in:
sebcrozet 2018-09-22 20:16:16 +02:00 committed by Sébastien Crozet
parent f2bad264ef
commit 130885d83a
1 changed files with 63 additions and 0 deletions

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@ -65,6 +65,69 @@ pub fn make_mat4x4<N: Scalar>(ptr: &[N]) -> Mat<N, U4, U4> {
Matrix4::from_column_slice(ptr) Matrix4::from_column_slice(ptr)
} }
/// Converts a 2x2 matrix to a 3x3 matrix.
pub fn mat2_to_mat3<N: Number>(m: &Mat<N, U2, U2>) -> Mat<N, U3, U3> {
let _0 = N::zero();
let _1 = N::one();
Matrix3::new(
m.m11, m.m12, _0,
m.m21, m.m22, _0,
_0, _0, _1
)
}
/// Converts a 3x3 matrix to a 2x2 matrix.
pub fn mat3_to_mat2<N: Scalar>(m: &Mat<N, U3, U3>) -> Mat<N, U2, U2> {
Matrix2::new(
m.m11, m.m12,
m.m21, m.m22
)
}
/// Converts a 3x3 matrix to a 4x4 matrix.
pub fn mat3_to_mat4<N: Number>(m: &Mat<N, U3, U3>) -> Mat<N, U4, U4> {
let _0 = N::zero();
let _1 = N::one();
Matrix4::new(
m.m11, m.m12, m.m13, _0,
m.m21, m.m22, m.m23, _0,
m.m31, m.m32, m.m33, _0,
_0, _0, _0, _1,
)
}
/// Converts a 4x4 matrix to a 3x3 matrix.
pub fn mat4_to_mat3<N: Scalar>(m: &Mat<N, U4, U4>) -> Mat<N, U3, U3> {
Matrix3::new(
m.m11, m.m12, m.m13,
m.m21, m.m22, m.m23,
m.m31, m.m32, m.m33,
)
}
/// Converts a 2x2 matrix to a 4x4 matrix.
pub fn mat2_to_mat4<N: Number>(m: &Mat<N, U2, U2>) -> Mat<N, U4, U4> {
let _0 = N::zero();
let _1 = N::one();
Matrix4::new(
m.m11, m.m12, _0, _0,
m.m21, m.m22, _0, _0,
_0, _0, _1, _0,
_0, _0, _0, _1,
)
}
/// Converts a 4x4 matrix to a 2x2 matrix.
pub fn mat4_to_mat2<N: Scalar>(m: &Mat<N, U4, U4>) -> Mat<N, U2, U2> {
Matrix2::new(
m.m11, m.m12,
m.m21, m.m22,
)
}
/// Creates a quaternion from a slice arranged as `[x, y, z, w]`. /// Creates a quaternion from a slice arranged as `[x, y, z, w]`.
pub fn make_quat<N: Real>(ptr: &[N]) -> Qua<N> { pub fn make_quat<N: Real>(ptr: &[N]) -> Qua<N> {
Quaternion::from_vector(Vector4::from_column_slice(ptr)) Quaternion::from_vector(Vector4::from_column_slice(ptr))