encode_area seems to work, ~4.6ns/pixel

Justfile

@@ -26,6 +26,10 @@ build_ext:
     cd ewext && cargo build --release --target=i686-pc-windows-gnu
     cp ewext/target/i686-pc-windows-gnu/release/ewext.dll quant.ew/ewext.dll
 
+build_ext_debug:
+    cd ewext && cargo build --target=i686-pc-windows-gnu
+    cp ewext/target/i686-pc-windows-gnu/debug/ewext.dll quant.ew/ewext.dll
+
 ##
 
 run-rel: add_dylib_release

ewext/src/lib.rs

@@ -5,7 +5,7 @@ use std::{
 };
 
 use lua_bindings::{lua_State, Lua51};
-use noita::ParticleWorldState;
+use noita::{NoitaPixelRun, ParticleWorldState};
 
 mod lua_bindings;
 
@@ -31,13 +31,15 @@ extern "C" fn init_particle_world_state(lua: *mut lua_State) -> c_int {
     println!("\nInitializing particle world state");
     let world_pointer = unsafe { LUA.lua_tointeger(lua, 1) };
     let chunk_map_pointer = unsafe { LUA.lua_tointeger(lua, 2) };
+    let material_list_pointer = unsafe { LUA.lua_tointeger(lua, 3) };
     println!("pws stuff: {world_pointer:?} {chunk_map_pointer:?}");
 
     STATE.with(|state| {
-        state.borrow_mut().particle_world_state = Some(ParticleWorldState::new(
-            world_pointer as *mut c_void,
-            chunk_map_pointer as *mut c_void,
-        ));
+        state.borrow_mut().particle_world_state = Some(ParticleWorldState {
+            world_ptr: world_pointer as *mut c_void,
+            chunk_map_ptr: chunk_map_pointer as *mut c_void,
+            material_list_ptr: material_list_pointer as _,
+        });
     });
     0
 }
@@ -49,8 +51,24 @@ extern "C" fn get_pixel_pointer(lua: *mut lua_State) -> c_int {
     STATE.with(|state| {
         let state = state.borrow_mut();
         let pws = state.particle_world_state.as_ref().unwrap();
-        let pixel_pointer = unsafe { pws.get_cell(x, y) };
-        unsafe { LUA.lua_pushinteger(lua, pixel_pointer as isize) };
+        // let pixel_pointer = pws.get_cell_raw(x, y);
+        // unsafe { LUA.lua_pushinteger(lua, pixel_pointer as isize) };
+    });
+    1
+}
+
+extern "C" fn encode_area(lua: *mut lua_State) -> c_int {
+    let start_x = unsafe { LUA.lua_tointeger(lua, 1) } as i32;
+    let start_y = unsafe { LUA.lua_tointeger(lua, 2) } as i32;
+    let end_x = unsafe { LUA.lua_tointeger(lua, 3) } as i32;
+    let end_y = unsafe { LUA.lua_tointeger(lua, 4) } as i32;
+    let encoded_buffer = unsafe { LUA.lua_tointeger(lua, 5) } as *mut NoitaPixelRun;
+
+    STATE.with(|state| {
+        let state = state.borrow_mut();
+        let pws = state.particle_world_state.as_ref().unwrap();
+        let runs = unsafe { pws.encode_area(start_x, start_y, end_x, end_y, encoded_buffer) };
+        unsafe { LUA.lua_pushinteger(lua, runs as isize) };
     });
     1
 }
@@ -63,8 +81,10 @@ pub extern "C" fn luaopen_ewext(lua: *mut lua_State) -> c_int {
 
         LUA.lua_pushcclosure(lua, Some(init_particle_world_state), 0);
         LUA.lua_setfield(lua, -2, c"init_particle_world_state".as_ptr());
-        LUA.lua_pushcclosure(lua, Some(get_pixel_pointer), 0);
-        LUA.lua_setfield(lua, -2, c"get_pixel_pointer".as_ptr());
+        // LUA.lua_pushcclosure(lua, Some(get_pixel_pointer), 0);
+        // LUA.lua_setfield(lua, -2, c"get_pixel_pointer".as_ptr());
+        LUA.lua_pushcclosure(lua, Some(encode_area), 0);
+        LUA.lua_setfield(lua, -2, c"encode_area".as_ptr());
     }
     println!("Initializing ewext - Ok");
     1

ewext/src/noita.rs

@@ -1,33 +1,167 @@
-use std::{ffi::c_void, ptr::null};
+use std::{ffi::c_void, mem, ptr::null};
+
+mod ntypes;
+
+#[repr(packed)]
+pub(crate) struct NoitaPixelRun {
+    length: u16,
+    material: u16,
+    flags: u8,
+}
+
+/// Copied from proxy.
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+pub(crate) struct RawPixel {
+    pub material: u16,
+    pub flags: u8,
+}
+
+/// Copied from proxy.
+/// Stores a run of pixels.
+/// Not specific to Noita side - length is an actual length
+#[derive(Debug)]
+struct PixelRun<Pixel> {
+    pub length: u32,
+    pub data: Pixel,
+}
+
+/// Copied from proxy.
+/// Converts a normal sequence of pixels to a run-length-encoded one.
+struct PixelRunner<Pixel> {
+    current_pixel: Option<Pixel>,
+    current_run_len: u32,
+    runs: Vec<PixelRun<Pixel>>,
+}
+
+impl<Pixel: Eq + Copy> Default for PixelRunner<Pixel> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<Pixel: Eq + Copy> PixelRunner<Pixel> {
+    fn new() -> Self {
+        Self {
+            current_pixel: None,
+            current_run_len: 0,
+            runs: Vec::new(),
+        }
+    }
+    fn put_pixel(&mut self, pixel: Pixel) {
+        if let Some(current) = self.current_pixel {
+            if pixel != current {
+                self.runs.push(PixelRun {
+                    length: self.current_run_len,
+                    data: current,
+                });
+                self.current_pixel = Some(pixel);
+                self.current_run_len = 1;
+            } else {
+                self.current_run_len += 1;
+            }
+        } else {
+            self.current_pixel = Some(pixel);
+            self.current_run_len = 1;
+        }
+    }
+    fn build(mut self) -> Vec<PixelRun<Pixel>> {
+        if self.current_run_len > 0 {
+            self.runs.push(PixelRun {
+                length: self.current_run_len,
+                data: self.current_pixel.expect("has current pixel"),
+            });
+        }
+        self.runs
+    }
+}
 
 pub(crate) struct ParticleWorldState {
-    world_pointer: *mut c_void,
-    chunk_map_this: *mut c_void,
+    pub(crate) world_ptr: *mut c_void,
+    pub(crate) chunk_map_ptr: *mut c_void,
+    pub(crate) material_list_ptr: *const c_void,
 }
 
 impl ParticleWorldState {
-    pub(crate) unsafe fn get_cell(&self, x: i32, y: i32) -> *const c_void {
+    fn get_cell_raw(&self, x: i32, y: i32) -> Option<&ntypes::Cell> {
         let x = x as isize;
         let y = y as isize;
         let chunk_index = (((((y) >> 9) - 256) & 511) * 512 + ((((x) >> 9) - 256) & 511)) * 4;
         // Deref 1/3
-        let chunk_arr = self.chunk_map_this.offset(8).cast::<*const c_void>().read();
+        let chunk_arr = unsafe { self.chunk_map_ptr.offset(8).cast::<*const c_void>().read() };
         // Deref 2/3
-        let chunk = chunk_arr.offset(chunk_index).cast::<*const c_void>().read();
+        let chunk = unsafe { chunk_arr.offset(chunk_index).cast::<*const c_void>().read() };
         if chunk.is_null() {
-            // TODO this normally returns air material
-            return null();
+            return None;
         }
         // Deref 3/3
-        let pixel_array = chunk.cast::<*const c_void>().read();
-        let pixel = pixel_array.offset(((y & 511) << 9 | x & 511) * 4);
-        pixel
+        let pixel_array = unsafe { chunk.cast::<*const c_void>().read() };
+        let pixel = unsafe { pixel_array.offset(((y & 511) << 9 | x & 511) * 4) };
+        if pixel.is_null() {
+            return None;
+        }
+
+        unsafe { pixel.cast::<*const ntypes::Cell>().read().as_ref() }
     }
 
-    pub(crate) fn new(world_pointer: *mut c_void, chunk_map_pointer: *mut c_void) -> Self {
-        Self {
-            world_pointer,
-            chunk_map_this: chunk_map_pointer,
+    fn get_cell_material_id(&self, cell: &ntypes::Cell) -> u16 {
+        let mat_ptr = cell.material_ptr();
+        let offset = unsafe { mat_ptr.cast::<c_void>().offset_from(self.material_list_ptr) };
+        let mat_id = (offset / ntypes::CELLDATA_SIZE) as u16;
+        mat_id
+    }
+
+    fn get_cell_type(&self, cell: &ntypes::Cell) -> ntypes::CellType {
+        unsafe { cell.material_ptr().as_ref().unwrap().cell_type }
+    }
+
+    pub(crate) unsafe fn encode_area(
+        &self,
+        start_x: i32,
+        start_y: i32,
+        end_x: i32,
+        end_y: i32,
+        pixel_runs: *mut NoitaPixelRun,
+    ) -> usize {
+        let mut runner = PixelRunner::default();
+        for y in start_y..end_y {
+            for x in start_x..end_x {
+                let mut raw_pixel = RawPixel {
+                    material: 0,
+                    flags: 0,
+                };
+                let cell = self.get_cell_raw(x, y);
+                if let Some(cell) = cell {
+                    let cell_type = self.get_cell_type(cell);
+                    match cell_type {
+                        ntypes::CellType::None => {}
+                        // Nobody knows how box2d pixels work.
+                        ntypes::CellType::Solid => {}
+                        ntypes::CellType::Liquid => {
+                            raw_pixel.material = self.get_cell_material_id(cell);
+                            let cell: &ntypes::LiquidCell = unsafe { mem::transmute(cell) };
+                            raw_pixel.flags = cell.is_static as u8;
+                        }
+                        ntypes::CellType::Gas | ntypes::CellType::Fire => {
+                            raw_pixel.material = self.get_cell_material_id(cell);
+                        }
+                        // ???
+                        ntypes::CellType::Invalid => {}
+                    }
+                }
+                runner.put_pixel(raw_pixel);
+            }
         }
+
+        let mut pixel_runs = pixel_runs;
+        let built_runner = runner.build();
+        let runs = built_runner.len();
+        for run in built_runner {
+            let noita_pixel_run = pixel_runs.as_mut().unwrap();
+            noita_pixel_run.length = (run.length - 1) as u16;
+            noita_pixel_run.material = run.data.material;
+            noita_pixel_run.flags = run.data.flags;
+            pixel_runs = pixel_runs.offset(1);
+        }
+        runs
     }
 }

ewext/src/noita/ntypes.rs

@@ -0,0 +1,66 @@
+// Type defs borrowed from NoitaPatcher.
+
+use std::ffi::{c_char, c_void};
+
+pub(crate) const CELLDATA_SIZE: isize = 0x290;
+
+#[repr(C)]
+#[derive(Debug)]
+pub(crate) struct StdString {
+    buffer: *const i8,
+    sso_buffer: [i8; 12],
+    size: usize,
+    capacity: usize,
+}
+
+#[repr(u32)]
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub(crate) enum CellType {
+    None = 0,
+    Liquid = 1,
+    Gas = 2,
+    Solid = 3,
+    Fire = 4,
+    Invalid = 4294967295,
+}
+
+#[repr(C)]
+pub(crate) struct CellData {
+    name: StdString,
+    ui_name: StdString,
+    material_type: i32,
+    id_2: i32,
+    pub(crate) cell_type: CellType,
+    // Has a bunch of other fields that aren't that relevant.
+}
+
+#[repr(C)]
+pub(crate) struct CellVTable {}
+
+#[repr(C)]
+pub(crate) struct Cell {
+    pub(crate) vtable: *const CellVTable,
+
+    hp: i32,
+    unknown1: [u8; 8],
+    is_burning: bool,
+    unknown2: [u8; 3],
+    material_ptr: *const CellData,
+}
+
+#[repr(C)]
+pub(crate) struct LiquidCell {
+    cell: Cell,
+    x: i32,
+    y: i32,
+    unknown1: c_char,
+    unknown2: c_char,
+    pub(crate) is_static: bool,
+    // Has a bunch of other fields that aren't that relevant.
+}
+
+impl Cell {
+    pub(crate) fn material_ptr(&self) -> *const CellData {
+        self.material_ptr
+    }
+}

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

@@ -25,6 +25,10 @@ pub(crate) struct RawPixel {
     pub flags: u8,
 }
 
+struct ByteParser<'a> {
+    data: &'a [u8],
+}
+
 /// Stores a run of pixels.
 /// Not specific to Noita side - length is an actual length
 #[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Encode, Decode)]
@@ -33,10 +37,6 @@ pub struct PixelRun<Pixel> {
     pub data: Pixel,
 }
 
-struct ByteParser<'a> {
-    data: &'a [u8],
-}
-
 /// Converts a normal sequence of pixels to a run-length-encoded one.
 pub struct PixelRunner<Pixel> {
     current_pixel: Option<Pixel>,

quant.ew/files/system/ewext_init/ewext_init.lua

@@ -8,21 +8,12 @@ function module.on_world_initialized()
     local chunk_map = grid_world.vtable.get_chunk_map(grid_world)
     grid_world = tonumber(ffi.cast("intptr_t", grid_world))
     chunk_map = tonumber(ffi.cast("intptr_t", chunk_map))
-    ewext.init_particle_world_state(grid_world, chunk_map)
+    local material_list = tonumber(ffi.cast("intptr_t", world_ffi.get_material_ptr(0)))
+    ewext.init_particle_world_state(grid_world, chunk_map, material_list)
 end
 
 function module.on_local_player_spawn()
-    local grid_world = world_ffi.get_grid_world()
-    local chunk_map = grid_world.vtable.get_chunk_map(grid_world)
-    local pix_p = ewext.get_pixel_pointer(0, 0)
-    
-    local ppixel = world_ffi.get_cell(chunk_map, 0, 0)
-    -- assert(pix_p ~= 0)
-    print(tonumber(ffi.cast("intptr_t", ppixel)))
-    print(pix_p)
-
-    assert(tonumber(ffi.cast("intptr_t", ppixel)) == pix_p)
-    
+       
 end
 
 return module

quant.ew/files/system/world_sync/world.lua

@@ -68,11 +68,11 @@ end
 -- @tparam EncodedArea encoded_area memory to use, if nil this function allocates its own memory
 -- @return returns an EncodedArea or nil if the area could not be encoded
 -- @see decode
-function world.encode_area(chunk_map, start_x, start_y, end_x, end_y, encoded_area)
-    start_x = ffi.cast('int32_t', start_x)
-    start_y = ffi.cast('int32_t', start_y)
-    end_x = ffi.cast('int32_t', end_x)
-    end_y = ffi.cast('int32_t', end_y)
+function world.encode_area(chunk_map, start_x_ini, start_y_ini, end_x_ini, end_y_ini, encoded_area)
+    start_x = ffi.cast('int32_t', start_x_ini)
+    start_y = ffi.cast('int32_t', start_y_ini)
+    end_x = ffi.cast('int32_t', end_x_ini)
+    end_y = ffi.cast('int32_t', end_y_ini)
 
     encoded_area = encoded_area or world.EncodedArea()
 
@@ -94,6 +94,11 @@ function world.encode_area(chunk_map, start_x, start_y, end_x, end_y, encoded_ar
     encoded_area.header.width = width - 1
     encoded_area.header.height = height - 1
 
+    encoded_area.header.pixel_run_count = ewext.encode_area(start_x_ini, start_y_ini, end_x_ini, end_y_ini, tonumber(ffi.cast("intptr_t", encoded_area.pixel_runs)))
+    if true then
+        return encoded_area
+    end
+
     local run_count = 1
 
     local current_run = encoded_area.pixel_runs[0]

quant.ew/files/system/world_sync/world_sync.lua

@@ -51,6 +51,7 @@ function world_sync.on_world_initialized()
     c = c - 1
     print("Last material id: "..c)
     world.last_material_id = c
+    do_benchmark()
 end
 
 local function send_chunks(cx, cy, chunk_map)