Support cuts through world in world sync. Closes #192.

noita-proxy/src/net.rs

@@ -556,6 +556,19 @@ impl NetManager {
                 }
             }
             Some("reset_world") => state.world.reset(),
+            Some("cut_through_world") => {
+                let x: Option<i32> = msg.next().and_then(|s| s.parse().ok());
+                let y_min: Option<i32> = msg.next().and_then(|s| s.parse().ok());
+                let y_max: Option<i32> = msg.next().and_then(|s| s.parse().ok());
+                let radius: Option<i32> = msg.next().and_then(|s| s.parse().ok());
+                let (Some(x), Some(y_min), Some(y_max), Some(radius)) = (x, y_min, y_max, radius)
+                else {
+                    error!("Missing arguments in cut_through_world message");
+                    return;
+                };
+
+                state.world.cut_through_world(x, y_min, y_max, radius);
+            }
             Some("flush") => self.peer.flush(),
             key => {
                 error!("Unknown msg from mod: {:?}", key)

noita-proxy/src/net/world.rs

@@ -1,10 +1,13 @@
-use std::{env, mem};
+use std::{env, f32::consts::PI, mem, time::Instant};
 
 use bitcode::{Decode, Encode};
 use rustc_hash::{FxHashMap, FxHashSet};
 use serde::{Deserialize, Serialize};
 use tracing::{debug, info, warn};
-use world_model::{ChunkCoord, ChunkData, ChunkDelta, WorldModel};
+use world_model::{
+    chunk::{Chunk, Pixel},
+    ChunkCoord, ChunkData, ChunkDelta, WorldModel, CHUNK_SIZE,
+};
 
 pub use world_model::encoding::NoitaWorldUpdate;
 
@@ -334,7 +337,13 @@ impl WorldManager {
     }
 
     pub(crate) fn update(&mut self) {
-        fn should_kill(my_pos: (i32, i32), cam_pos: (i32, i32), chx: i32, chy: i32, is_notplayer: bool) -> bool {
+        fn should_kill(
+            my_pos: (i32, i32),
+            cam_pos: (i32, i32),
+            chx: i32,
+            chy: i32,
+            is_notplayer: bool,
+        ) -> bool {
             let (x, y) = my_pos;
             let (cx, cy) = cam_pos;
             if (x - cx).abs() > 2 || (y - cy).abs() > 2 {
@@ -370,12 +379,24 @@ impl WorldManager {
                 }
                 // This state doesn't have much to do.
                 ChunkState::WaitingForAuthority => {
-                    if should_kill(self.my_pos, self.cam_pos, chunk.0, chunk.1, self.is_notplayer) {
+                    if should_kill(
+                        self.my_pos,
+                        self.cam_pos,
+                        chunk.0,
+                        chunk.1,
+                        self.is_notplayer,
+                    ) {
                         *state = ChunkState::UnloadPending;
                     }
                 }
                 ChunkState::Listening { authority, .. } => {
-                    if should_kill(self.my_pos, self.cam_pos, chunk.0, chunk.1, self.is_notplayer) {
+                    if should_kill(
+                        self.my_pos,
+                        self.cam_pos,
+                        chunk.0,
+                        chunk.1,
+                        self.is_notplayer,
+                    ) {
                         debug!("Unloading [listening] chunk {chunk:?}");
                         emit_queue.push((
                             Destination::Peer(*authority),
@@ -385,7 +406,13 @@ impl WorldManager {
                     }
                 }
                 ChunkState::Authority { new_authority, .. } => {
-                    if should_kill(self.my_pos, self.cam_pos, chunk.0, chunk.1, self.is_notplayer) {
+                    if should_kill(
+                        self.my_pos,
+                        self.cam_pos,
+                        chunk.0,
+                        chunk.1,
+                        self.is_notplayer,
+                    ) {
                         if let Some(new) = new_authority {
                             emit_queue.push((
                                 Destination::Peer(new.0),
@@ -407,7 +434,13 @@ impl WorldManager {
                     }
                 }
                 ChunkState::WantToGetAuth { .. } => {
-                    if should_kill(self.my_pos, self.cam_pos, chunk.0, chunk.1, self.is_notplayer) {
+                    if should_kill(
+                        self.my_pos,
+                        self.cam_pos,
+                        chunk.0,
+                        chunk.1,
+                        self.is_notplayer,
+                    ) {
                         debug!("Unloading [want to get auth] chunk {chunk:?}");
                         *state = ChunkState::UnloadPending;
                     }
@@ -766,18 +799,17 @@ impl WorldManager {
                 } else {
                     self.emit_msg(
                         Destination::Host,
-                        WorldNetMessage::RelinquishAuthority { chunk, chunk_data: None },
+                        WorldNetMessage::RelinquishAuthority {
+                            chunk,
+                            chunk_data: None,
+                        },
                     );
                 }
             }
             WorldNetMessage::RequestAuthorityTransfer { chunk } => {
                 info!("Got a request for authority transfer");
                 let state = self.chunk_state.get(&chunk);
-                if let Some(ChunkState::Authority {
-                    listeners,
-                    ..
-                }) = state
-                {
+                if let Some(ChunkState::Authority { listeners, .. }) = state {
                     let chunk_data = self.outbound_model.get_chunk_data(chunk);
                     self.emit_msg(
                         Destination::Peer(source),
@@ -899,6 +931,62 @@ impl WorldManager {
             })
             .collect()
     }
+
+    pub(crate) fn cut_through_world(&mut self, x: i32, y_min: i32, y_max: i32, radius: i32) {
+        let start = Instant::now();
+        info!("Started cut_through_world");
+
+        let max_wiggle = 5;
+        let interval = 300.0;
+
+        let cut_x_clip_range =
+            (x - radius - max_wiggle - CHUNK_SIZE as i32)..(x + radius + max_wiggle);
+        let cut_x_range = x - radius..x + radius;
+
+        for (chunk_coord, chunk_encoded) in self.chunk_storage.iter_mut() {
+            // Check if this chunk is anywhere close to the cut. Skip if it isn't.
+            let chunk_start_x = chunk_coord.0 * CHUNK_SIZE as i32;
+            let chunk_start_y = chunk_coord.1 * CHUNK_SIZE as i32;
+            if !cut_x_clip_range.contains(&chunk_start_x) {
+                continue;
+            }
+
+            let mut chunk = Chunk::default();
+            chunk_encoded.apply_to_chunk(&mut chunk);
+
+            for in_chunk_y in 0..(CHUNK_SIZE as i32) {
+                let global_y = in_chunk_y + chunk_start_y;
+                // Skip if higher/lower than the cut.
+                if global_y < y_min || global_y > y_max {
+                    continue;
+                }
+
+                let wiggle = -f32::cos((global_y as f32) / interval * PI * 2.0) * max_wiggle as f32;
+                let wiggle = wiggle as i32; // TODO find a more accurate way to compute wiggle.
+
+                let in_chunk_x_range = cut_x_range.start - chunk_start_x + wiggle
+                    ..cut_x_range.end - chunk_start_x + wiggle;
+                let in_chunk_x_range = in_chunk_x_range.start.clamp(0, CHUNK_SIZE as i32 - 1)
+                    ..in_chunk_x_range.end.clamp(0, CHUNK_SIZE as i32);
+
+                for in_chunk_x in in_chunk_x_range {
+                    let air_pixel = Pixel {
+                        flags: world_model::chunk::PixelFlags::Normal,
+                        material: 0,
+                    };
+                    chunk.set_pixel(
+                        (in_chunk_y as usize) * CHUNK_SIZE + (in_chunk_x as usize),
+                        air_pixel,
+                    );
+                }
+            }
+
+            *chunk_encoded = chunk.to_chunk_data();
+        }
+
+        let elapsed = start.elapsed();
+        info!("Cut through world took {} ms", elapsed.as_millis());
+    }
 }
 
 impl Drop for WorldManager {
@@ -912,4 +1000,4 @@ impl Drop for WorldManager {
 
 impl SaveStateEntry for FxHashMap<ChunkCoord, ChunkData> {
     const FILENAME: &'static str = "world_chunks";
-}
+}

noita-proxy/src/net/world/world_model.rs

@@ -6,10 +6,10 @@ use encoding::{NoitaWorldUpdate, PixelRun, PixelRunner};
 use rustc_hash::{FxHashMap, FxHashSet};
 use tracing::info;
 
-mod chunk;
+pub(crate) mod chunk;
 pub mod encoding;
 
-const CHUNK_SIZE: usize = 128;
+pub(crate) const CHUNK_SIZE: usize = 128;
 
 #[derive(Debug, Encode, Decode, Clone, Copy, Hash, PartialEq, Eq)]
 pub(crate) struct ChunkCoord(pub i32, pub i32);
@@ -51,6 +51,17 @@ impl ChunkData {
         let runs = runner.build();
         ChunkData { runs }
     }
+
+    pub(crate) fn apply_to_chunk(&self, chunk: &mut Chunk) {
+        let mut offset = 0;
+        for run in &self.runs {
+            for _ in 0..run.length {
+                let pixel = run.data;
+                chunk.set_compact_pixel(offset, pixel);
+                offset += 1;
+            }
+        }
+    }
 }
 
 impl WorldModel {
@@ -188,24 +199,12 @@ impl WorldModel {
     pub(crate) fn apply_chunk_data(&mut self, chunk: ChunkCoord, chunk_data: &ChunkData) {
         self.updated_chunks.insert(chunk);
         let chunk = self.chunks.entry(chunk).or_default();
-        let mut offset = 0;
-        for run in &chunk_data.runs {
-            for _ in 0..run.length {
-                let pixel = run.data;
-                chunk.set_compact_pixel(offset, pixel);
-                offset += 1;
-            }
-        }
+        chunk_data.apply_to_chunk(chunk);
     }
 
     pub(crate) fn get_chunk_data(&mut self, chunk: ChunkCoord) -> Option<ChunkData> {
         let chunk = self.chunks.get(&chunk)?;
-        let mut runner = PixelRunner::new();
-        for i in 0..CHUNK_SIZE * CHUNK_SIZE {
-            runner.put_pixel(chunk.compact_pixel(i))
-        }
-        let runs = runner.build();
-        Some(ChunkData { runs })
+        Some(chunk.to_chunk_data())
     }
 
     pub(crate) fn forget_chunk(&mut self, chunk: ChunkCoord) {

noita-proxy/src/net/world/world_model/chunk.rs

@@ -3,10 +3,14 @@ use std::num::NonZeroU16;
 use bitcode::{Decode, Encode};
 use crossbeam::atomic::AtomicCell;
 
-use super::{encoding::RawPixel, CHUNK_SIZE};
+use super::{
+    encoding::{PixelRunner, RawPixel},
+    ChunkData, CHUNK_SIZE,
+};
 
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Encode, Decode)]
 pub enum PixelFlags {
+    /// Actual material isn't known yet.
     #[default]
     Unknown,
     Normal,
@@ -139,4 +143,13 @@ impl Chunk {
         self.changed = [false; CHUNK_SIZE * CHUNK_SIZE];
         self.any_changed = false;
     }
+
+    pub fn to_chunk_data(&self) -> ChunkData {
+        let mut runner = PixelRunner::new();
+        for i in 0..CHUNK_SIZE * CHUNK_SIZE {
+            runner.put_pixel(self.compact_pixel(i))
+        }
+        let runs = runner.build();
+        ChunkData { runs }
+    }
 }

quant.ew/files/system/world_sync_cuts/patch_cut_through_world.lua

@@ -0,0 +1,6 @@
+local old_GameCutThroughWorldVertical = GameCutThroughWorldVertical
+
+function GameCutThroughWorldVertical(...)
+    old_GameCutThroughWorldVertical(...)
+    CrossCall("ew_cut_through_world", ...)
+end

quant.ew/files/system/world_sync_cuts/world_sync_cuts.lua

@@ -0,0 +1,11 @@
+np.CrossCallAdd("ew_cut_through_world", function(x, min_y, max_y, radius, _radius2)
+    if ctx.is_host then
+        net.proxy_send("cut_through_world", x.." "..min_y.." "..max_y.." "..radius)
+    end
+end)
+
+ModLuaFileAppend("data/scripts/magic/beam_from_sky.lua", "mods/quant.ew/files/system/world_sync_cuts/patch_cut_through_world.lua")
+
+local module = {}
+
+return module

quant.ew/init.lua

@@ -121,6 +121,7 @@ local function load_modules()
     ctx.load_system("angry_ghost_memory")
     ctx.load_system("gate_boss")
     ctx.load_system("tapion")
+    ctx.load_system("world_sync_cuts")
 end
 
 local function load_extra_modules()