1 files changed, 40 insertions, 6 deletions

diff --git a/src/main.rs b/src/main.rs
index e7f2084..08bc61c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ mod renderer;
 mod sim;
 
 use futures::executor;
+use glam::Vec2;
 use rand::random_range;
 use std::{collections::VecDeque, sync::Arc, time::Instant};
 use winit::{
@@ -24,6 +25,7 @@ use crate::{
     sim::{
         cell::{cell::Cell, materials::MaterialId},
         cell_sim::{sim::sim_tick, world::World},
+        particle_sim::{ParticleManager, particle::Particle},
         rb_sim::{DebugRenderMode, RbSimManager, debug_ops::DebugOperator},
         write_rb_entity_to_world,
     },
@@ -51,6 +53,7 @@ struct Input {
     is_rmb_pressed: bool,
     trigger_test_1: bool,
     trigger_test_2: bool,
+    trigger_test_3: bool,
 
     // keybindings
     is_up_pressed: bool,
@@ -77,6 +80,7 @@ struct App {
 
     // physics
     rb_sim_manager: Option<RbSimManager>,
+    particle_manager: Option<ParticleManager>,
 
     // sim state
     // the last/current (not yet completed) seqno
@@ -122,6 +126,24 @@ impl App {
             rbsm.test_spawn_ball(lm.0, lm.1, self.config.dropper_material);
         }
 
+        if self.input.trigger_test_3
+            && let Some(lm) = self.input.last_mouse_world_pos
+            && let Some(pm) = &mut self.particle_manager
+        {
+            self.input.trigger_test_3 = false;
+            for i in 0..100 {
+                pm.particles.push(Particle {
+                    position: Vec2::new(
+                        lm.0 + random_range(-25.0..25.0),
+                        lm.1 + random_range(-25.0..25.0),
+                    ),
+                    velocity: Vec2::ZERO,
+                    material: MaterialId::Sand,
+                    life: 2.0,
+                })
+            }
+        }
+
         // --TEST DRAWING--
         if (self.input.is_lmb_pressed || self.input.is_rmb_pressed)
             && let Some(lm) = self.input.last_mouse_world_pos
@@ -227,6 +249,12 @@ impl App {
             }
             physics_manager.rb_tick(physics_delta_time);
         }
+        // move the particles
+        if let Some(particle_manager) = &mut self.particle_manager
+            && let Some(world) = &mut self.world
+        {
+            particle_manager.particle_tick(world, physics_delta_time);
+        }
     }
 }
 
@@ -244,6 +272,7 @@ impl Default for App {
 
                 trigger_test_1: false,
                 trigger_test_2: false,
+                trigger_test_3: false,
                 is_lmb_pressed: false,
                 is_rmb_pressed: false,
                 is_up_pressed: false,
@@ -257,6 +286,7 @@ impl Default for App {
             world: Some(World::from_default_size()),
 
             rb_sim_manager: Some(RbSimManager::new()),
+            particle_manager: Some(ParticleManager::new()),
 
             sim_seqno: 0,
             sim_paused: false,
@@ -341,6 +371,11 @@ impl ApplicationHandler for App {
                     KeyCode::KeyS => self.input.is_down_pressed = pressed,
                     KeyCode::KeyD => self.input.is_right_pressed = pressed,
                     KeyCode::KeyC => self.world = Some(World::from_default_size()),
+                    KeyCode::KeyP => {
+                        self.particle_manager
+                            .as_mut()
+                            .map(|pm| pm.particles = Vec::new());
+                    }
                     KeyCode::KeyV => {
                         if let Some(rbsm) = self.rb_sim_manager.as_mut() {
                             let entity_ids: Vec<u32> = rbsm.rb_entities.keys().copied().collect();
@@ -370,6 +405,7 @@ impl ApplicationHandler for App {
                     KeyCode::KeyX if pressed => self.ignore_pause_next_tick = true,
                     KeyCode::Digit1 if pressed && !repeat => self.input.trigger_test_1 = true,
                     KeyCode::Digit2 if pressed && !repeat => self.input.trigger_test_2 = true,
+                    KeyCode::Digit3 if pressed && !repeat => self.input.trigger_test_3 = true,
                     _ => {}
                 }
             }
@@ -412,14 +448,10 @@ impl ApplicationHandler for App {
                 puffin::profile_scope!("redraw_requested");
                 // compute FPS diagnostics
                 let now = Instant::now();
-                let secs_since_last_frame = (now - self.last_render).as_secs_f32();
+                let delta_time = (now - self.last_render).as_secs_f32();
                 self.last_render = now;
 
-                let delta_time = secs_since_last_frame / (1.0 / 60.0);
-
-                self.diagnostics
-                    .frame_times
-                    .push_back(secs_since_last_frame);
+                self.diagnostics.frame_times.push_back(delta_time);
 
                 if self.diagnostics.frame_times.len() > 30 {
                     self.diagnostics.frame_times.pop_front();
@@ -475,11 +507,13 @@ impl ApplicationHandler for App {
                 if let Some(renderer_state) = &mut self.renderer_state
                     && let Some(world) = &mut self.world
                     && let Some(rb_sim_manager) = &mut self.rb_sim_manager
+                    && let Some(particle_manager) = &mut self.particle_manager
                     && let Some(camera) = &mut self.camera
                 {
                     renderer_state.render(
                         world,
                         rb_sim_manager,
+                        particle_manager,
                         camera,
                         &mut self.config,
                         &self.diagnostics,