get_cell impl in ewext (maybe)

.vscode/c_cpp_properties.json

@@ -0,0 +1,15 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "linux-clang-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -9,5 +9,6 @@
     "Lua.diagnostics.globals": [
         "wait",
         "async"
-    ]
+    ],
+    "C_Cpp.default.compilerPath": "/usr/bin/clang++"
 }

ewext/src/lib.rs

@@ -4,6 +4,8 @@ use lua_bindings::{lua_State, Lua51};
 
 mod lua_bindings;
 
+mod noita;
+
 static LUA: LazyLock<Lua51> = LazyLock::new(|| unsafe {
     let lib = libloading::Library::new("./lua51.dll").expect("library to exist");
     Lua51::from_library(lib).expect("library to be lua")

ewext/src/noita.rs

@@ -0,0 +1,16 @@
+use std::ffi::c_void;
+
+pub(crate) struct ChunkMap {
+    this: *mut c_void,
+}
+
+impl ChunkMap {
+    unsafe fn get_cell(&self, x: u32, y: u32) {
+        let x = x as isize;
+        let y = y as isize;
+        let index = ((((y) >> 9) - 256 & 511) * 512 + (((x) >> 9) - 256 & 511)) * 4;
+        let chunk_arr = self.this.offset(8).cast::<*const c_void>().read();
+        let chunk = chunk_arr.offset(index).cast::<*const c_void>().read();
+        let pixel = chunk.offset(((y & 511) << 9 | x & 511) * 4);
+    }
+}