From ca51244e9d462c661d29dc60ce5bf6f9056c569b Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Wed, 10 Apr 2024 20:37:53 +0200
Subject: chore(ecs): make shared singletons not components

---
 ecs/src/component/single.rs | 98 ---------------------------------------------
 1 file changed, 98 deletions(-)
 delete mode 100644 ecs/src/component/single.rs

(limited to 'ecs/src/component/single.rs')

diff --git a/ecs/src/component/single.rs b/ecs/src/component/single.rs
deleted file mode 100644
index a63dbe3..0000000
--- a/ecs/src/component/single.rs
+++ /dev/null
@@ -1,98 +0,0 @@
-use std::any::{type_name, Any, TypeId};
-use std::ops::{Deref, DerefMut};
-
-use crate::component::Component;
-use crate::system::{ComponentRefMut, NoInitParamFlag, Param as SystemParam, System};
-use crate::tuple::FilterExclude as TupleFilterExclude;
-use crate::WorldData;
-
-/// Holds a component which has a single instance and is shared globally.
-#[derive(Debug)]
-pub struct Single<'world, SingleComponent: Component>
-{
-    single_component: ComponentRefMut<'world, SingleComponent>,
-}
-
-unsafe impl<'world, SingleComponent> SystemParam<'world>
-    for Single<'world, SingleComponent>
-where
-    SingleComponent: Component,
-{
-    type Flags = NoInitParamFlag;
-    type Input = TupleFilterExclude;
-
-    fn initialize<SystemImpl>(
-        _system: &mut impl System<'world, SystemImpl>,
-        _input: Self::Input,
-    )
-    {
-    }
-
-    fn new<SystemImpl>(
-        _system: &'world impl System<'world, SystemImpl>,
-        world_data: &'world WorldData,
-    ) -> Self
-    {
-        let single_component = world_data
-            .single_component_storage
-            .get::<SingleComponent>()
-            .expect("Single component was not found in world")
-            .write_nonblock()
-            .unwrap_or_else(|_| {
-                panic!(
-                    "Failed to aquire read-write lock to single component {}",
-                    type_name::<SingleComponent>()
-                )
-            });
-
-        Self {
-            single_component: ComponentRefMut::new(single_component),
-        }
-    }
-
-    fn is_compatible<Other: SystemParam<'world>>() -> bool
-    {
-        let other_comparable = Other::get_comparable();
-
-        let Some(comparable) = other_comparable.downcast_ref::<Comparable>() else {
-            // The other system param is not Single
-            return true;
-        };
-
-        TypeId::of::<SingleComponent>() != comparable.single_component_type_id
-    }
-
-    fn get_comparable() -> Box<dyn Any>
-    {
-        Box::new(Comparable {
-            single_component_type_id: TypeId::of::<SingleComponent>(),
-        })
-    }
-}
-
-impl<'world, SingleComponent> Deref for Single<'world, SingleComponent>
-where
-    SingleComponent: Component,
-{
-    type Target = SingleComponent;
-
-    fn deref(&self) -> &Self::Target
-    {
-        &self.single_component
-    }
-}
-
-impl<'world, SingleComponent> DerefMut for Single<'world, SingleComponent>
-where
-    SingleComponent: Component,
-{
-    fn deref_mut(&mut self) -> &mut Self::Target
-    {
-        &mut self.single_component
-    }
-}
-
-struct Comparable
-{
-    single_component_type_id: TypeId,
-}
-- 
cgit v1.2.3-18-g5258