Added /explosion command

common/src/event.rs

@@ -4,6 +4,7 @@ use vek::*;
 
 pub enum Event {
     LandOnGround { entity: EcsEntity, vel: Vec3<f32> },
+    Explosion { pos: Vec3<f32>, radius: f32 },
 }
 
 #[derive(Default)]
@@ -19,6 +20,10 @@ impl EventBus {
         }
     }
 
+    pub fn emit(&self, event: Event) {
+        self.queue.lock().unwrap().push_front(event);
+    }
+
     pub fn recv_all(&self) -> impl ExactSizeIterator<Item = Event> {
         std::mem::replace(self.queue.lock().unwrap().deref_mut(), VecDeque::new()).into_iter()
     }

common/src/ray.rs

@@ -2,32 +2,47 @@ use crate::vol::{ReadVol, Vox};
 use vek::*;
 
 pub trait RayUntil<V: Vox> = FnMut(&V) -> bool;
+pub trait RayForEach = FnMut(Vec3<i32>);
 
-pub struct Ray<'a, V: ReadVol, F: RayUntil<V::Vox>> {
+pub struct Ray<'a, V: ReadVol, F: RayUntil<V::Vox>, G: RayForEach> {
     vol: &'a V,
     from: Vec3<f32>,
     to: Vec3<f32>,
     until: F,
+    for_each: Option<G>,
     max_iter: usize,
     ignore_error: bool,
 }
 
-impl<'a, V: ReadVol, F: RayUntil<V::Vox>> Ray<'a, V, F> {
+impl<'a, V: ReadVol, F: RayUntil<V::Vox>, G: RayForEach> Ray<'a, V, F, G> {
     pub fn new(vol: &'a V, from: Vec3<f32>, to: Vec3<f32>, until: F) -> Self {
         Self {
             vol,
             from,
             to,
             until,
+            for_each: None,
             max_iter: 100,
             ignore_error: false,
         }
     }
 
-    pub fn until(self, f: F) -> Ray<'a, V, F> {
+    pub fn until(self, f: F) -> Ray<'a, V, F, G> {
         Ray { until: f, ..self }
     }
 
+    pub fn for_each<H: RayForEach>(self, f: H) -> Ray<'a, V, F, H> {
+        Ray {
+            for_each: Some(f),
+            vol: self.vol,
+            from: self.from,
+            to: self.to,
+            until: self.until,
+            max_iter: self.max_iter,
+            ignore_error: self.ignore_error,
+        }
+    }
+
     pub fn max_iter(mut self, max_iter: usize) -> Self {
         self.max_iter = max_iter;
         self
@@ -56,6 +71,11 @@ impl<'a, V: ReadVol, F: RayUntil<V::Vox>> Ray<'a, V, F> {
                 break;
             }
 
+            // for_each
+            if let Some(g) = &mut self.for_each {
+                g(ipos);
+            }
+
             match self.vol.get(ipos).map(|vox| (vox, (self.until)(vox))) {
                 Ok((vox, true)) => return (dist, Ok(Some(vox))),
                 Err(err) if !self.ignore_error => return (dist, Err(err)),

common/src/state.rs

@@ -315,16 +315,15 @@ impl State {
             .for_each(|(pos, block)| {
                 let _ = terrain.set(*pos, *block);
             });
-        std::mem::swap(
+        self.ecs.write_resource::<TerrainChanges>().modified_blocks = std::mem::replace(
             &mut self.ecs.write_resource::<BlockChange>().blocks,
-            &mut self.ecs.write_resource::<TerrainChanges>().modified_blocks,
+            Default::default(),
-        )
+        );
     }
 
     /// Clean up the state after a tick.
     pub fn cleanup(&mut self) {
         // Clean up data structures from the last tick.
         self.ecs.write_resource::<TerrainChanges>().clear();
-        self.ecs.write_resource::<BlockChange>().clear();
     }
 }

common/src/vol.rs

@@ -76,7 +76,11 @@ pub trait ReadVol: BaseVol {
         self.get(pos).unwrap()
     }
 
-    fn ray(&self, from: Vec3<f32>, to: Vec3<f32>) -> Ray<Self, fn(&Self::Vox) -> bool>
+    fn ray(
+        &self,
+        from: Vec3<f32>,
+        to: Vec3<f32>,
+    ) -> Ray<Self, fn(&Self::Vox) -> bool, fn(Vec3<i32>)>
     where
         Self: Sized,
     {

server/src/cmd.rs

@@ -6,6 +6,7 @@ use crate::Server;
 use chrono::{NaiveTime, Timelike};
 use common::{
     comp,
+    event::{Event as GameEvent, EventBus},
     msg::ServerMsg,
     npc::{get_npc_name, NpcKind},
     state::TimeOfDay,
@@ -147,10 +148,16 @@ lazy_static! {
         ),
         ChatCommand::new(
             "lantern",
-            "{} ",
+            "{}",
             "/lantern : adds/remove light near player",
             handle_lantern,
         ),
+        ChatCommand::new(
+            "explosion",
+            "{}",
+            "/explosion <radius> : Explodes the ground around you",
+            handle_explosion,
+        ),
     ];
 }
 
@@ -669,6 +676,22 @@ fn handle_lantern(server: &mut Server, entity: EcsEntity, args: String, action:
     }
 }
 
+fn handle_explosion(server: &mut Server, entity: EcsEntity, args: String, action: &ChatCommand) {
+    if let Ok(radius) = scan_fmt!(&args, action.arg_fmt, f32) {
+        match server.state.read_component_cloned::<comp::Pos>(entity) {
+            Some(pos) => server
+                .state
+                .ecs()
+                .read_resource::<EventBus>()
+                .emit(GameEvent::Explosion { pos: pos.0, radius }),
+            None => server.clients.notify(
+                entity,
+                ServerMsg::private(String::from("You have no position!")),
+            ),
+        }
+    }
+}
+
 fn handle_tell(server: &mut Server, entity: EcsEntity, args: String, action: &ChatCommand) {
     if let Ok(alias) = scan_fmt!(&args, action.arg_fmt, String) {
         let ecs = server.state.ecs();

server/src/lib.rs

@@ -18,7 +18,7 @@ use common::{
     event::{Event as GameEvent, EventBus},
     msg::{ClientMsg, ClientState, RequestStateError, ServerError, ServerInfo, ServerMsg},
     net::PostOffice,
-    state::{State, TimeOfDay, Uid},
+    state::{BlockChange, State, TimeOfDay, Uid},
     terrain::{block::Block, TerrainChunk, TerrainChunkSize, TerrainMap},
     vol::Vox,
     vol::{ReadVol, VolSize},
@@ -203,6 +203,8 @@ impl Server {
 
     /// Handle events coming through via the event bus
     fn handle_events(&mut self) {
+        let terrain = self.state.ecs().read_resource::<TerrainMap>();
+        let mut block_change = self.state.ecs().write_resource::<BlockChange>();
         let mut stats = self.state.ecs().write_storage::<comp::Stats>();
 
         for event in self.state.ecs().read_resource::<EventBus>().recv_all() {
@@ -215,6 +217,24 @@ impl Server {
                         }
                     }
                 }
+                GameEvent::Explosion { pos, radius } => {
+                    const RAYS: usize = 500;
+
+                    for _ in 0..RAYS {
+                        let dir = Vec3::new(
+                            rand::random::<f32>() - 0.5,
+                            rand::random::<f32>() - 0.5,
+                            rand::random::<f32>() - 0.5,
+                        )
+                        .normalized();
+
+                        let _ = terrain
+                            .ray(pos, pos + dir * radius)
+                            .until(|_| rand::random::<f32>() < 0.05)
+                            .for_each(|pos| block_change.set(pos, Block::empty()))
+                            .cast();
+                    }
+                }
             }
         }
     }
@@ -249,6 +269,9 @@ impl Server {
         frontend_events.append(&mut self.handle_new_connections()?);
         frontend_events.append(&mut self.handle_new_messages()?);
 
+        // Handle game events
+        self.handle_events();
+
         // 4) Tick the client's LocalState.
         self.state.tick(dt);
 
@@ -371,9 +394,6 @@ impl Server {
             self.state.remove_chunk(key);
         }
 
-        // Handle events
-        self.handle_events();
-
         // 6) Synchronise clients with the new state of the world.
         self.sync_clients();