139 lines
3.3 KiB
Rust
139 lines
3.3 KiB
Rust
use na::{U2, U3};
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use traits::Number;
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use aliases::{TVec2, TVec3, TMat3, TMat4};
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/// Build planar projection matrix along normal axis and right-multiply it to `m`.
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pub fn proj2d<N: Number>(m: &TMat3<N>, normal: &TVec2<N>) -> TMat3<N> {
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let mut res = TMat3::identity();
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{
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let mut part = res.fixed_slice_mut::<U2, U2>(0, 0);
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part -= normal * normal.transpose();
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}
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m * res
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}
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/// Build planar projection matrix along normal axis, and right-multiply it to `m`.
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pub fn proj<N: Number>(m: &TMat4<N>, normal: &TVec3<N>) -> TMat4<N> {
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let mut res = TMat4::identity();
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{
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let mut part = res.fixed_slice_mut::<U3, U3>(0, 0);
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part -= normal * normal.transpose();
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}
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m * res
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}
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/// Builds a reflection matrix and right-multiply it to `m`.
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pub fn reflect2d<N: Number>(m: &TMat3<N>, normal: &TVec2<N>) -> TMat3<N> {
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let mut res = TMat3::identity();
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{
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let mut part = res.fixed_slice_mut::<U2, U2>(0, 0);
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part -= (normal * N::from_f64(2.0).unwrap()) * normal.transpose();
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}
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m * res
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}
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/// Builds a reflection matrix, and right-multiply it to `m`.
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pub fn reflect<N: Number>(m: &TMat4<N>, normal: &TVec3<N>) -> TMat4<N> {
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let mut res = TMat4::identity();
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{
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let mut part = res.fixed_slice_mut::<U3, U3>(0, 0);
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part -= (normal * N::from_f64(2.0).unwrap()) * normal.transpose();
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}
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m * res
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}
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/// Builds a scale-bias matrix.
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pub fn scale_bias_matrix<N: Number>(scale: N, bias: N) -> TMat4<N> {
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let _0 = N::zero();
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let _1 = N::one();
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TMat4::new(
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scale, _0, _0, bias,
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_0, scale, _0, bias,
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_0, _0, scale, bias,
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_0, _0, _0, _1,
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)
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}
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/// Builds a scale-bias matrix, and right-multiply it to `m`.
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pub fn scale_bias<N: Number>(m: &TMat4<N>, scale: N, bias: N) -> TMat4<N> {
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m * scale_bias_matrix(scale, bias)
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}
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/// Transforms a matrix with a shearing on X axis.
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pub fn shear2d_x<N: Number>(m: &TMat3<N>, y: N) -> TMat3<N> {
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let _0 = N::zero();
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let _1 = N::one();
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let shear = TMat3::new(
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_1, y, _0,
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_0, _1, _0,
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_0, _0, _1
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);
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m * shear
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}
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/// Transforms a matrix with a shearing on Y axis.
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pub fn shear_x<N: Number>(m: &TMat4<N>, y: N, z: N) -> TMat4<N> {
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let _0 = N::zero();
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let _1 = N::one();
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let shear = TMat4::new(
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_1, _0, _0, _0,
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y, _1, _0, _0,
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z, _0, _1, _0,
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_0, _0, _0, _1,
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);
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m * shear
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}
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/// Transforms a matrix with a shearing on Y axis.
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pub fn shear2d_y<N: Number>(m: &TMat3<N>, x: N) -> TMat3<N> {
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let _0 = N::zero();
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let _1 = N::one();
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let shear = TMat3::new(
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_1, _0, _0,
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x, _1, _0,
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_0, _0, _1
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);
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m * shear
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}
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/// Transforms a matrix with a shearing on Y axis.
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pub fn shear_y<N: Number>(m: &TMat4<N>, x: N, z: N) -> TMat4<N> {
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let _0 = N::zero();
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let _1 = N::one();
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let shear = TMat4::new(
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_1, x, _0, _0,
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_0, _1, _0, _0,
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_0, z, _1, _0,
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_0, _0, _0, _1,
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);
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m * shear
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}
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/// Transforms a matrix with a shearing on Z axis.
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pub fn shear_z<N: Number>(m: &TMat4<N>, x: N, y: N) -> TMat4<N> {
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let _0 = N::zero();
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let _1 = N::one();
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let shear = TMat4::new(
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_1, _0, x, _0,
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_0, _1, y, _0,
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_0, _0, _1, _0,
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_0, _0, _0, _1,
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);
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m * shear
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}
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