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use crate::geometry::Ray;
use crate::math::{Point, Vector, DIM, SIMD_WIDTH};
use crate::utils;
use ncollide::bounding_volume::AABB;
use num::{One, Zero};
use {
crate::math::{SimdBool, SimdFloat},
simba::simd::{SimdPartialOrd, SimdValue},
};
#[derive(Debug, Copy, Clone)]
pub(crate) struct WRay {
pub origin: Point<SimdFloat>,
pub dir: Vector<SimdFloat>,
}
impl WRay {
pub fn splat(ray: Ray) -> Self {
Self {
origin: Point::splat(ray.origin),
dir: Vector::splat(ray.dir),
}
}
}
#[derive(Debug, Copy, Clone)]
pub(crate) struct WAABB {
pub mins: Point<SimdFloat>,
pub maxs: Point<SimdFloat>,
}
#[cfg(feature = "serde-serialize")]
impl serde::Serialize for WAABB {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
use serde::ser::SerializeStruct;
let mins: Point<[f32; SIMD_WIDTH]> = Point::from(
self.mins
.coords
.map(|e| array![|ii| e.extract(ii); SIMD_WIDTH]),
);
let maxs: Point<[f32; SIMD_WIDTH]> = Point::from(
self.maxs
.coords
.map(|e| array![|ii| e.extract(ii); SIMD_WIDTH]),
);
let mut waabb = serializer.serialize_struct("WAABB", 2)?;
waabb.serialize_field("mins", &mins)?;
waabb.serialize_field("maxs", &maxs)?;
waabb.end()
}
}
#[cfg(feature = "serde-serialize")]
impl<'de> serde::Deserialize<'de> for WAABB {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
struct Visitor {};
impl<'de> serde::de::Visitor<'de> for Visitor {
type Value = WAABB;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(
formatter,
"two arrays containing at least {} floats",
SIMD_WIDTH * DIM * 2
)
}
fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
where
A: serde::de::SeqAccess<'de>,
{
let mins: Point<[f32; SIMD_WIDTH]> = seq
.next_element()?
.ok_or_else(|| serde::de::Error::invalid_length(0, &self))?;
let maxs: Point<[f32; SIMD_WIDTH]> = seq
.next_element()?
.ok_or_else(|| serde::de::Error::invalid_length(1, &self))?;
let mins = Point::from(mins.coords.map(|e| SimdFloat::from(e)));
let maxs = Point::from(maxs.coords.map(|e| SimdFloat::from(e)));
Ok(WAABB { mins, maxs })
}
}
deserializer.deserialize_struct("WAABB", &["mins", "maxs"], Visitor {})
}
}
impl WAABB {
pub fn new_invalid() -> Self {
Self::splat(AABB::new_invalid())
}
pub fn splat(aabb: AABB<f32>) -> Self {
Self {
mins: Point::splat(aabb.mins),
maxs: Point::splat(aabb.maxs),
}
}
pub fn dilate_by_factor(&mut self, factor: SimdFloat) {
let dilation = (self.maxs - self.mins) * factor;
self.mins -= dilation;
self.maxs += dilation;
}
pub fn replace(&mut self, i: usize, aabb: AABB<f32>) {
self.mins.replace(i, aabb.mins);
self.maxs.replace(i, aabb.maxs);
}
pub fn intersects_ray(&self, ray: &WRay, max_toi: SimdFloat) -> SimdBool {
let _0 = SimdFloat::zero();
let _1 = SimdFloat::one();
let _infinity = SimdFloat::splat(f32::MAX);
let mut hit = SimdBool::splat(true);
let mut tmin = SimdFloat::zero();
let mut tmax = max_toi;
for i in 0usize..DIM {
let is_not_zero = ray.dir[i].simd_ne(_0);
let is_zero_test =
ray.origin[i].simd_ge(self.mins[i]) & ray.origin[i].simd_le(self.maxs[i]);
let is_not_zero_test = {
let denom = _1 / ray.dir[i];
let mut inter_with_near_plane =
((self.mins[i] - ray.origin[i]) * denom).select(is_not_zero, -_infinity);
let mut inter_with_far_plane =
((self.maxs[i] - ray.origin[i]) * denom).select(is_not_zero, _infinity);
let gt = inter_with_near_plane.simd_gt(inter_with_far_plane);
utils::simd_swap(gt, &mut inter_with_near_plane, &mut inter_with_far_plane);
tmin = tmin.simd_max(inter_with_near_plane);
tmax = tmax.simd_min(inter_with_far_plane);
tmin.simd_le(tmax)
};
hit = hit & is_not_zero_test.select(is_not_zero, is_zero_test);
}
hit
}
#[cfg(feature = "dim2")]
pub fn contains(&self, other: &WAABB) -> SimdBool {
self.mins.x.simd_le(other.mins.x)
& self.mins.y.simd_le(other.mins.y)
& self.maxs.x.simd_ge(other.maxs.x)
& self.maxs.y.simd_ge(other.maxs.y)
}
#[cfg(feature = "dim3")]
pub fn contains(&self, other: &WAABB) -> SimdBool {
self.mins.x.simd_le(other.mins.x)
& self.mins.y.simd_le(other.mins.y)
& self.mins.z.simd_le(other.mins.z)
& self.maxs.x.simd_ge(other.maxs.x)
& self.maxs.y.simd_ge(other.maxs.y)
& self.maxs.z.simd_ge(other.maxs.z)
}
#[cfg(feature = "dim2")]
pub fn intersects(&self, other: &WAABB) -> SimdBool {
self.mins.x.simd_le(other.maxs.x)
& other.mins.x.simd_le(self.maxs.x)
& self.mins.y.simd_le(other.maxs.y)
& other.mins.y.simd_le(self.maxs.y)
}
#[cfg(feature = "dim3")]
pub fn intersects(&self, other: &WAABB) -> SimdBool {
self.mins.x.simd_le(other.maxs.x)
& other.mins.x.simd_le(self.maxs.x)
& self.mins.y.simd_le(other.maxs.y)
& other.mins.y.simd_le(self.maxs.y)
& self.mins.z.simd_le(other.maxs.z)
& other.mins.z.simd_le(self.maxs.z)
}
pub fn to_merged_aabb(&self) -> AABB<f32> {
AABB::new(
self.mins.coords.map(|e| e.simd_horizontal_min()).into(),
self.maxs.coords.map(|e| e.simd_horizontal_max()).into(),
)
}
}
impl From<[AABB<f32>; SIMD_WIDTH]> for WAABB {
fn from(aabbs: [AABB<f32>; SIMD_WIDTH]) -> Self {
let mins = array![|ii| aabbs[ii].mins; SIMD_WIDTH];
let maxs = array![|ii| aabbs[ii].maxs; SIMD_WIDTH];
WAABB {
mins: Point::from(mins),
maxs: Point::from(maxs),
}
}
}