Add some more methods to 3D vectors, and a `gluLookAt()` workalike

This commit is contained in:
Patrick Walton 2019-12-18 15:19:42 -08:00
parent 8dabd0a7ea
commit 9124d9856a
3 changed files with 465 additions and 1 deletions

417
Cargo.lock generated
View File

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@ -2514,8 +2922,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -2572,6 +2982,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -2584,8 +2995,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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View File

@ -10,7 +10,7 @@
//! 3D transforms that can be applied to paths.
use crate::vector::{Vector2F, Vector2I, Vector4F};
use crate::vector::{Vector2F, Vector2I, Vector3F, Vector4F};
use crate::rect::RectF;
use crate::transform2d::Matrix2x2F;
use pathfinder_simd::default::F32x4;
@ -201,6 +201,25 @@ impl Transform4F {
)
}
/// Just like `gluLookAt()`.
#[inline]
pub fn looking_at(eye: Vector3F, center: Vector3F, mut up: Vector3F) -> Transform4F {
let f = (center - eye).normalize();
up = up.normalize();
let s = f.cross(up);
let u = s.normalize().cross(f);
let minus_f = -f;
// TODO(pcwalton): Use SIMD. This needs a matrix transpose:
// https://fgiesen.wordpress.com/2013/07/09/simd-transposes-1/
let transform = Transform4F::row_major(s.x(), s.y(), s.z(), 0.0,
u.x(), u.y(), u.z(), 0.0,
minus_f.x(), minus_f.y(), minus_f.z(), 0.0,
0.0, 0.0, 0.0, 1.0) *
Transform4F::from_translation((-eye).to_4d());
transform
}
// +- -+
// | A B |
// | C D |

View File

@ -318,6 +318,26 @@ impl Vector3F {
pub fn normalize(self) -> Vector3F {
Vector3F(self.0 * F32x4::splat(1.0 / self.length()))
}
#[inline]
pub fn x(self) -> f32 {
self.0[0]
}
#[inline]
pub fn y(self) -> f32 {
self.0[1]
}
#[inline]
pub fn z(self) -> f32 {
self.0[2]
}
#[inline]
pub fn scale(self, factor: f32) -> Vector3F {
Vector3F(self.0 * F32x4::splat(factor))
}
}
impl Add<Vector3F> for Vector3F {
@ -335,6 +355,14 @@ impl AddAssign for Vector3F {
}
}
impl Neg for Vector3F {
type Output = Vector3F;
#[inline]
fn neg(self) -> Vector3F {
Vector3F(self.0 * F32x4::new(-1.0, -1.0, -1.0, 0.0))
}
}
impl Sub<Vector3F> for Vector3F {
type Output = Vector3F;
#[inline]