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68: PR #4/5 Astolfo feature/builtin-quaternion r=Bromeon a=RealAstolfo Co-Authored-By: Thomas ten Cate <ttencate@gmail.com> Implemented Quaternion to the best of my current ability to resemble godot's, meant to be merged after #67 Co-authored-by: RealAstolfo <astolfo.gman@gmail.com> Co-authored-by: Jan Haller <bromeon@gmail.com>
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/* | ||
* This Source Code Form is subject to the terms of the Mozilla Public | ||
* License, v. 2.0. If a copy of the MPL was not distributed with this | ||
* file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
*/ | ||
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// TODO this is experimental -- do not refactor existing types to this yet | ||
// Need to see if ergonomics are worth the generic complexity. | ||
// | ||
// Nice: | ||
// self.glam2(&with, |a, b| a.dot(b)) | ||
// self.glam2(&with, glam::f32::Quat::dot) | ||
// | ||
// Alternative with only conversions: | ||
// self.glam().dot(b.glam()) | ||
// GlamType::dot(self.glam(), b.glam()) | ||
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pub(crate) trait GlamConv { | ||
type Glam: GlamType<Mapped = Self>; | ||
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fn to_glam(&self) -> Self::Glam { | ||
Self::Glam::from_front(self) | ||
} | ||
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fn glam<F, R>(&self, unary_fn: F) -> R::Mapped | ||
where | ||
R: GlamType, | ||
F: FnOnce(Self::Glam) -> R, | ||
{ | ||
let arg = Self::Glam::from_front(self); | ||
let result = unary_fn(arg); | ||
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result.to_front() | ||
} | ||
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fn glam2<F, P, R>(&self, rhs: &P, binary_fn: F) -> R::Mapped | ||
where | ||
P: GlamConv, | ||
R: GlamType, | ||
F: FnOnce(Self::Glam, P::Glam) -> R, | ||
{ | ||
let arg0 = Self::Glam::from_front(self); | ||
let arg1 = P::Glam::from_front(rhs); | ||
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let result = binary_fn(arg0, arg1); | ||
result.to_front() | ||
} | ||
} | ||
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pub(crate) trait GlamType { | ||
type Mapped; | ||
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fn to_front(&self) -> Self::Mapped; | ||
fn from_front(mapped: &Self::Mapped) -> Self; | ||
} | ||
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macro_rules! impl_glam_map_self { | ||
($T:ty) => { | ||
impl GlamType for $T { | ||
type Mapped = $T; | ||
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fn to_front(&self) -> $T { | ||
*self | ||
} | ||
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fn from_front(mapped: &$T) -> Self { | ||
*mapped | ||
} | ||
} | ||
}; | ||
} | ||
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impl_glam_map_self!(f32); | ||
impl_glam_map_self!((f32, f32, f32)); |
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