From 3c5b52c742a86dfb86238bad3bfc375bf12fc518 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 23 Aug 2026 17:53:46 -0700
Subject: profiling, tweaks

---
 src/sim/sim_manager/mod.rs   | 21 ++++++++++++++++++++-
 src/sim/sim_manager/utils.rs | 30 ++++++++++++++++++------------
 2 files changed, 38 insertions(+), 13 deletions(-)

(limited to 'src/sim/sim_manager')

diff --git a/src/sim/sim_manager/mod.rs b/src/sim/sim_manager/mod.rs
index 89ae528..8fab9cf 100644
--- a/src/sim/sim_manager/mod.rs
+++ b/src/sim/sim_manager/mod.rs
@@ -5,9 +5,10 @@ use fxhash::FxHashMap;
 use crate::{
     Config, InputManager,
     config::{PHYSICS_DELTA_TIME, PHYSICS_FPS, SIM_FPS},
+    input::Input,
     sim::{
         cell_manager::manager::CellManager,
-        entity::{Entity, EntityDef, EntityId, EntityUpdateResult},
+        entity::{Entity, EntityDef, EntityId},
         particle_manager::ParticleManager,
         rb_manager::RbManager,
         sim_manager::utils::{
@@ -163,6 +164,24 @@ impl SimManager {
     }
 
     pub fn update(&mut self, config: &Config, input_manager: &InputManager, delta_time: f32) {
+        // handle sim controls
+        if input_manager.pressed(Input::Pause) {
+            self.paused = !self.paused;
+        }
+        if input_manager.pressed(Input::Step) {
+            self.ignore_pause_next_tick = true;
+        }
+        if input_manager.pressed(Input::ClearGrid) {
+            self.cell_manager = CellManager::from_default_size();
+        }
+        if input_manager.pressed(Input::ClearEntities) {
+            let entities: Vec<EntityId> = self.entities.drain().map(|(id, _)| id).collect();
+            entities.iter().for_each(|&id| self.destroy_entity(id));
+        }
+        if input_manager.pressed(Input::ClearParticles) {
+            self.particle_manager.particles = Vec::new();
+        }
+
         let now = Instant::now();
         let secs_since_last_cell_update = (now - self.last_cell_update).as_secs_f32();
         let expected_secs_since_last_cell_update = 1.0 / SIM_FPS as f32;
diff --git a/src/sim/sim_manager/utils.rs b/src/sim/sim_manager/utils.rs
index e77f30a..f30e9a0 100644
--- a/src/sim/sim_manager/utils.rs
+++ b/src/sim/sim_manager/utils.rs
@@ -68,6 +68,7 @@ pub fn write_entities_to_world(
     sim: &mut SimManager,
     // (entity_x, entity_y, cell_x, cell_y)
 ) -> Vec<(EntityId, Vec<(u8, u8, i32, i32)>)> {
+    puffin::profile_function!();
     // TODO optimize
     let entity_ids: Vec<EntityId> = sim.entities.keys().copied().collect();
     let mut cells_written_by_entity: Vec<(EntityId, Vec<(u8, u8, i32, i32)>)> = Vec::new();
@@ -85,6 +86,7 @@ pub fn read_back_entities_from_world(
     sim: &mut SimManager,
     cells_written_by_entity: Vec<(EntityId, Vec<(u8, u8, i32, i32)>)>,
 ) {
+    puffin::profile_function!();
     for (entity_id, cells_written) in cells_written_by_entity {
         let mut entity = sim.entities.get_mut(&entity_id);
         let mut should_update_entity = false;
@@ -115,19 +117,23 @@ pub fn read_back_entities_from_world(
         if let Some(entity) = &mut entity
             && should_update_entity
         {
+            puffin::profile_scope!("Recompute collider");
             if let Some(new_collider) = entity.compute_collider() {
-                sim.rb_manager
-                    .physics_manager
-                    .world
-                    .remove_collider(entity.data.collider_h.unwrap());
-
-                let new_handle = sim
-                    .rb_manager
-                    .physics_manager
-                    .world
-                    .insert_collider(new_collider, Some(entity.data.rb_h.unwrap()));
-
-                entity.data.collider_h = Some(new_handle);
+                {
+                    puffin::profile_scope!("Upsert collider");
+                    sim.rb_manager
+                        .physics_manager
+                        .world
+                        .remove_collider(entity.data.collider_h.unwrap());
+
+                    let new_handle = sim
+                        .rb_manager
+                        .physics_manager
+                        .world
+                        .insert_collider(new_collider, Some(entity.data.rb_h.unwrap()));
+
+                    entity.data.collider_h = Some(new_handle);
+                }
             }
         }
     }
-- 
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