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Prevent event from getting registered twice (#4258)

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# Objective

As described in  #4257, registering an Event twice would cause some systems to miss events on some starts, since the event buffer is cleared + swapped multiple times.

Fixes #4257

## Solution

A simple check whether the event is already registered is added, making adding an Event a second time a no-op.
This commit is contained in:
Mathis 2022-03-20 21:54:10 +00:00
parent b0ddce36bd
commit cd694c0d08
1 changed files with 5 additions and 2 deletions
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7
crates/bevy_app/src/app.rs
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@ -622,8 +622,11 @@ impl App {
where
T: Resource,
{
self.init_resource::<Events<T>>()
.add_system_to_stage(CoreStage::First, Events::<T>::update_system)
if !self.world.contains_resource::<Events<T>>() {
self.init_resource::<Events<T>>()
.add_system_to_stage(CoreStage::First, Events::<T>::update_system);
}
self
}
/// Inserts a resource to the current [App] and overwrites any resource previously added of the same type.