dumb iterator implemented ith faster hashmap

Cargo.lock

@@ -954,6 +954,12 @@ version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "adad44e29e4c806119491a7f06f03de4d1af22c3a680dd47f1e6e179439d1f56"
 
+[[package]]
+name = "rustc-hash"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "583034fd73374156e66797ed8e5b0d5690409c9226b22d87cb7f19821c05d152"
+
 [[package]]
 name = "rustix"
 version = "0.38.32"
@@ -1218,6 +1224,7 @@ dependencies = [
  "png",
  "pretty_env_logger",
  "rand",
+ "rustc-hash",
  "serde",
  "thiserror",
  "tobj",

Cargo.toml

@@ -16,4 +16,5 @@ tobj = { version = "3", features = ["log"] }
 vulkanalia = { version = "=0.23.0", features = ["libloading", "provisional", "window"] }
 winit = "0.29"
 serde = { version = "1.0", features = ["derive"] }
-rand = "0.8"
+rand = "0.8"
+rustc-hash = "*"

src/scene.rs

@@ -4,6 +4,7 @@ use anyhow::Result;
 use cgmath::{vec2, vec3};
 
 use std::collections::HashMap;
+use rustc_hash::FxHashMap;
 
 use crate::app_data::AppData;
 use crate::buffer;
@@ -13,7 +14,7 @@ use crate::primitives::cube::Cube;
 extern crate rand;
 use rand::Rng;
 
-const CHUNK_SIZE: usize = 100;
+const CHUNK_SIZE: usize = 500;
 
 #[derive(Clone, Debug, Default)]
 pub struct Scene {
@@ -80,12 +81,12 @@ impl Scene {
 #[derive(Clone, Debug)]
 struct Chunk {
     //todo change to hashmap?
-    blocks: HashMap<cgmath::Vector3<u32>, Cube>,
+    blocks: HashMap<cgmath::Vector3<u32>, Cube, rustc_hash::FxBuildHasher>,
 }
 
 impl Chunk {
     pub fn create() -> Result<Self> {
-        let mut map = HashMap::new();
+        let mut map: HashMap<cgmath::Vector3<u32>, Cube, rustc_hash::FxBuildHasher> = FxHashMap::default();
         Ok(Self {
             blocks: map
         })