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Massively reduced 'popping' of LoD terrain sprites

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This commit is contained in:
Joshua Barretto 2020-04-24 16:08:51 +01:00
parent e498d78b6c
commit 1d75f4815b
1 changed files with 9 additions and 7 deletions
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16
common/src/volumes/scaled.rs
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@ -16,12 +16,14 @@ impl<'a, V: ReadVol> ReadVol for Scaled<'a, V> {
fn get(&self, pos: Vec3<i32>) -> Result<&Self::Vox, Self::Error> {
let pos = pos.map2(self.scale, |e, scale| (e as f32 / scale).trunc() as i32);
let search_size = (Vec3::one() / self.scale).map(|e: f32| e.ceil() as i32);
let range_iter = |x| std::iter::successors(Some(0), |x| Some(if *x < 0 { -*x } else { -(*x + 1) })).take(x as usize * 2 + 1);
let range_iter = |x| {
std::iter::successors(Some(0), |x| Some(if *x < 0 { -*x } else { -(*x + 1) }))
.take((x as usize * 2).max(1) - 1)
};
range_iter(search_size.x / 2)
.map(|i| {
range_iter(search_size.y / 2).map(move |j| {
range_iter(search_size.z / 2).map(move |k| Vec3::new(i, j, k))
})
range_iter(search_size.y / 2)
.map(move |j| range_iter(search_size.z / 2).map(move |k| Vec3::new(i, j, k)))
})
.flatten()
.flatten()
@ -41,8 +43,8 @@ impl<'a, V: SizedVol> SizedVol for Scaled<'a, V> {
#[inline(always)]
fn upper_bound(&self) -> Vec3<i32> {
self.inner.upper_bound().map2(self.scale, |e, scale| {
(e as f32 * scale).ceil() as i32 + 1
})
self.inner
.upper_bound()
.map2(self.scale, |e, scale| (e as f32 * scale).ceil() as i32 + 1)
}
}