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Fix table reserve logic (#1698)

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Fixes #1692
Alternative to #1696

This ensures that the capacity actually grows in increments of grow_amount, and also ensures that Table capacity is always <= column and entity vec capacity.

Debug logs that describe the new logic (running the example in #1692)
[out.txt](https://github.com/bevyengine/bevy/files/6173808/out.txt)
This commit is contained in:
Carter Anderson 2021-03-19 23:32:31 +00:00
parent c78b76bba8
commit b6be8a5314
1 changed files with 7 additions and 2 deletions
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9
crates/bevy_ecs/src/storage/table.rs
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@ -327,12 +327,17 @@ impl Table {
pub fn reserve(&mut self, amount: usize) {
let available_space = self.capacity - self.len();
if available_space < amount {
let reserve_amount = (amount - available_space).max(self.grow_amount);
let min_capacity = self.len() + amount;
// normally we would check if min_capacity is 0 for the below calculation, but amount > available_space and
// available_space > 0, so min_capacity > 1
let new_capacity =
((min_capacity + self.grow_amount - 1) / self.grow_amount) * self.grow_amount;
let reserve_amount = new_capacity - self.len();
for column in self.columns.values_mut() {
column.reserve(reserve_amount);
}
self.entities.reserve(reserve_amount);
self.capacity += reserve_amount;
self.capacity = new_capacity;
}
}