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use core::slice;
use std::ops::Deref;
use glam::Vec2;
use slotmap::{secondary::Iter, SecondaryMap};
use smallvec::SmallVec;
use crate::{util::face_intersect, BSPTree, Face, NodeIndex, Portal, PortalRef, Side, TOLERANCE};
#[derive(Copy, Debug, Clone, PartialEq)]
#[doc(hidden)]
pub struct ClippedFace {
face: Face,
pub(crate) sides: [Side; 2],
pub src: NodeIndex,
pub dst: NodeIndex,
}
impl ClippedFace {
pub fn new(vertices: [Vec2; 2], sides: [Side; 2], src: NodeIndex, dst: NodeIndex) -> Self {
Self {
face: Face::new(vertices),
sides,
src,
dst,
}
}
pub(crate) fn split_nondestructive(&self, p: Vec2, normal: Vec2) -> [Self; 2] {
let intersection = face_intersect(self.into_tuple(), p, normal);
let a = (self.vertices[0] - p).dot(normal);
if a >= -TOLERANCE {
[
Self::new(
[self.vertices[0], intersection.point],
[Side::Front, Side::Front],
self.src,
self.dst,
),
Self::new(
[intersection.point, self.vertices[1]],
[Side::Front, Side::Front],
self.src,
self.dst,
),
]
} else {
[
Self::new(
[intersection.point, self.vertices[1]],
[Side::Front, Side::Front],
self.src,
self.dst,
),
Self::new(
[self.vertices[0], intersection.point],
[Side::Front, Side::Front],
self.src,
self.dst,
),
]
}
}
pub(crate) fn split(&self, p: Vec2, normal: Vec2, double_planar: bool) -> [Self; 2] {
let intersection = face_intersect(self.into_tuple(), p, normal);
let a = (self.vertices[0] - p).dot(normal);
let front = if double_planar {
Side::Back
} else {
Side::Front
};
if a >= -TOLERANCE {
[
Self::new(
[self.vertices[0], intersection.point],
[self.sides[0], front],
self.src,
self.dst,
),
Self::new(
[intersection.point, self.vertices[1]],
[Side::Back, self.sides[1]],
self.src,
self.dst,
),
]
} else {
[
Self::new(
[intersection.point, self.vertices[1]],
[front, self.sides[1]],
self.src,
self.dst,
),
Self::new(
[self.vertices[0], intersection.point],
[self.sides[0], Side::Back],
self.src,
self.dst,
),
]
}
}
pub fn src(&self) -> NodeIndex {
self.src
}
pub fn dst(&self) -> NodeIndex {
self.dst
}
pub fn sides(&self) -> [Side; 2] {
self.sides
}
pub fn face(&self) -> Face {
self.face
}
}
impl Deref for ClippedFace {
type Target = Face;
fn deref(&self) -> &Self::Target {
&self.face
}
}
type NodePortals = SmallVec<[PortalRef; 4]>;
#[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
pub struct Portals {
inner: SecondaryMap<NodeIndex, NodePortals>,
faces: Vec<Face>,
}
impl Portals {
pub fn new() -> Self {
Self {
inner: SecondaryMap::new(),
faces: Vec::new(),
}
}
pub fn generate(&mut self, tree: &BSPTree) {
self.extend(tree.generate_portals())
}
pub fn push(&mut self, portal: ClippedFace) {
let face = self.faces.len();
self.faces.push(portal.face);
assert_ne!(portal.src, portal.dst);
self.inner
.entry(portal.src)
.expect("Node was removed")
.or_default()
.push(PortalRef {
dst: portal.dst,
src: portal.src,
normal: -portal.normal(),
face,
});
self.inner
.entry(portal.dst)
.expect("Node was removed")
.or_default()
.push(PortalRef {
dst: portal.src,
src: portal.dst,
normal: portal.normal(),
face,
});
}
pub fn get(&self, index: NodeIndex) -> PortalIter {
PortalIter {
faces: &self.faces,
iter: self
.inner
.get(index)
.map(|val| val.as_ref())
.unwrap_or_default()
.iter(),
}
}
pub fn iter(&self) -> PortalsIter {
PortalsIter {
faces: &self.faces,
inner: self.inner.iter(),
}
}
pub fn from_ref(&self, portal: PortalRef) -> Portal {
Portal {
face: &self.faces[portal.face],
portal_ref: portal,
}
}
}
#[doc(hidden)]
pub struct PortalIter<'a> {
faces: &'a [Face],
iter: slice::Iter<'a, PortalRef>,
}
impl<'a> Iterator for PortalIter<'a> {
type Item = Portal<'a>;
fn next(&mut self) -> Option<Self::Item> {
let portal = self.iter.next()?;
Some(Portal {
face: &self.faces[portal.face],
portal_ref: *portal,
})
}
}
impl<'a> IntoIterator for &'a Portals {
type Item = PortalIter<'a>;
type IntoIter = PortalsIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
#[doc(hidden)]
pub struct PortalsIter<'a> {
faces: &'a [Face],
inner: Iter<'a, NodeIndex, NodePortals>,
}
impl<'a> Iterator for PortalsIter<'a> {
type Item = PortalIter<'a>;
fn next(&mut self) -> Option<Self::Item> {
let (_, portals) = self.inner.next()?;
Some(PortalIter {
faces: self.faces,
iter: portals.iter(),
})
}
}
impl Default for Portals {
fn default() -> Self {
Self::new()
}
}
impl Extend<ClippedFace> for Portals {
fn extend<T: IntoIterator<Item = ClippedFace>>(&mut self, iter: T) {
let iter = iter.into_iter();
let cap = self.inner.len() + iter.size_hint().0;
self.inner.set_capacity(cap);
iter.for_each(|val| self.push(val))
}
}