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Massively reduced 'popping' of LoD terrain sprites
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parent
e498d78b6c
commit
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@ -16,12 +16,14 @@ impl<'a, V: ReadVol> ReadVol for Scaled<'a, V> {
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fn get(&self, pos: Vec3<i32>) -> Result<&Self::Vox, Self::Error> {
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let pos = pos.map2(self.scale, |e, scale| (e as f32 / scale).trunc() as i32);
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let search_size = (Vec3::one() / self.scale).map(|e: f32| e.ceil() as i32);
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let range_iter = |x| std::iter::successors(Some(0), |x| Some(if *x < 0 { -*x } else { -(*x + 1) })).take(x as usize * 2 + 1);
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let range_iter = |x| {
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std::iter::successors(Some(0), |x| Some(if *x < 0 { -*x } else { -(*x + 1) }))
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.take((x as usize * 2).max(1) - 1)
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};
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range_iter(search_size.x / 2)
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.map(|i| {
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range_iter(search_size.y / 2).map(move |j| {
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range_iter(search_size.z / 2).map(move |k| Vec3::new(i, j, k))
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})
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range_iter(search_size.y / 2)
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.map(move |j| range_iter(search_size.z / 2).map(move |k| Vec3::new(i, j, k)))
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})
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.flatten()
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.flatten()
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@ -41,8 +43,8 @@ impl<'a, V: SizedVol> SizedVol for Scaled<'a, V> {
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#[inline(always)]
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fn upper_bound(&self) -> Vec3<i32> {
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self.inner.upper_bound().map2(self.scale, |e, scale| {
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(e as f32 * scale).ceil() as i32 + 1
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})
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self.inner
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.upper_bound()
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.map2(self.scale, |e, scale| (e as f32 * scale).ceil() as i32 + 1)
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}
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}
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