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Fix ABA problem in incremental query pipeline update

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This commit is contained in:
Sébastien Crozet
2022-11-27 12:13:08 +01:00
parent 683baf6bf7
commit 7e95cba09d
1 changed files with 11 additions and 4 deletions
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15
src/pipeline/query_pipeline.rs
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@@ -330,14 +330,21 @@ impl QueryPipeline {
removed_colliders: &[ColliderHandle],
refit_and_rebalance: bool,
) {
for modified in modified_colliders {
self.qbvh.pre_update_or_insert(*modified);
}
// We remove first. This is needed to avoid the ABA problem: if a collider was removed
// and another added right after with the same handle index, we can remove first, and
// then update the new one (but only if its actually exists, to address the case where
// a collider was added/modified and then removed during the same frame).
for removed in removed_colliders {
self.qbvh.remove(*removed);
}
for modified in modified_colliders {
// Check that the collider still exists as it may have been removed.
if colliders.contains(*modified) {
self.qbvh.pre_update_or_insert(*modified);
}
}
if refit_and_rebalance {
let _ = self.qbvh.refit(0.0, &mut self.workspace, |handle| {
colliders[*handle].compute_aabb()