wip data

.gitignore

@@ -13,3 +13,5 @@ target/
 _src
 
 _visualizer.json
+
+*.kubi

Cargo.lock

@@ -1033,11 +1033,13 @@ dependencies = [
  "glam",
  "hashbrown 0.14.0",
  "nohash-hasher",
+ "num_enum 0.7.1",
  "postcard",
  "rand",
  "rand_xoshiro",
  "serde",
  "shipyard",
+ "static_assertions",
  "strum",
 ]
 
@@ -1223,7 +1225,7 @@ dependencies = [
  "bitflags 1.3.2",
  "jni-sys",
  "ndk-sys",
- "num_enum",
+ "num_enum 0.5.11",
  "raw-window-handle 0.5.2",
  "thiserror",
 ]
@@ -1371,7 +1373,16 @@ version = "0.5.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f646caf906c20226733ed5b1374287eb97e3c2a5c227ce668c1f2ce20ae57c9"
 dependencies = [
- "num_enum_derive",
+ "num_enum_derive 0.5.11",
+]
+
+[[package]]
+name = "num_enum"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683751d591e6d81200c39fb0d1032608b77724f34114db54f571ff1317b337c0"
+dependencies = [
+ "num_enum_derive 0.7.1",
 ]
 
 [[package]]
@@ -1386,6 +1397,18 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "num_enum_derive"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c11e44798ad209ccdd91fc192f0526a369a01234f7373e1b141c96d7cee4f0e"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.23",
+]
+
 [[package]]
 name = "objc"
 version = "0.2.7"

kubi-shared/Cargo.toml

@@ -8,6 +8,7 @@ publish = false
 glam = { version = "0.24", features = ["debug-glam-assert", "fast-math", "serde"] }
 shipyard = { git = "https://github.com/leudz/shipyard", rev = "0934b426eb9a8", default-features = false, features = ["std"] }
 strum = { version = "0.25", features = ["derive"] }
+num_enum = "0.7"
 postcard = { version = "1.0", features = ["alloc"] }
 serde = { version = "1.0", default-features = false, features = ["alloc", "derive"] }
 bincode = "1.3"
@@ -17,9 +18,8 @@ rand = { version = "0.8", default_features = false, features = ["std", "min_cons
 rand_xoshiro = "0.6"
 hashbrown = { version = "0.14", features = ["serde"] }
 nohash-hasher = "0.2"
-
 #bytemuck = { version = "1.14", features = ["derive"] }
-#static_assertions = "1.1"
+static_assertions = "1.1"
 
 [features]
 default = []

kubi-shared/src/block.rs

@@ -1,5 +1,6 @@
 use serde::{Serialize, Deserialize};
 use strum::EnumIter;
+use num_enum::TryFromPrimitive;
 
 #[derive(Serialize, Deserialize, Clone, Copy, Debug, EnumIter)]
 #[repr(u8)]
@@ -22,7 +23,7 @@ pub enum BlockTexture {
   WaterSolid,
 }
 
-#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, EnumIter)]
+#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, EnumIter, TryFromPrimitive)]
 #[repr(u8)]
 pub enum Block {
   Air,

kubi-shared/src/data.rs

@@ -2,13 +2,20 @@ use std::{
   fs::File,
   mem::size_of,
   io::{Read, Seek, SeekFrom, Write},
-  borrow::Cow
+  borrow::Cow,
+  sync::{Arc, RwLock}
 };
+use num_enum::TryFromPrimitive;
 use serde::{Serialize, Deserialize};
-use glam::IVec2;
+use glam::IVec3;
 use hashbrown::HashMap;
 use anyhow::Result;
-use crate::{block::Block, chunk::{CHUNK_SIZE, BlockDataRef}};
+use shipyard::Unique;
+use static_assertions::const_assert_eq;
+use crate::{
+  block::Block,
+  chunk::{CHUNK_SIZE, BlockDataRef, BlockData}
+};
 
 const SECTOR_SIZE: usize = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE * size_of::<Block>();
 const RESERVED_SIZE: usize = 1048576; //~1mb (16 sectors assuming 32x32x32 world of 1byte blocks)
@@ -20,13 +27,13 @@ const HEADER_MAGIC_STR: [u8; 4] = *b"KUBI";
 const HEADER_MAGIC_IDENTITY: u32 = 1;
 
 // #[repr(transparent)]
-// struct IVec2Hash(IVec2);
+// struct IVec3Hash(IVec3);
 #[derive(Serialize, Deserialize)]
-struct WorldSaveDataHeader {
+pub struct WorldSaveDataHeader {
   pub name: Cow<'static, str>,
   pub seed: u64,
   sector_count: u32,
-  chunk_map: HashMap<IVec2, u32>,
+  chunk_map: HashMap<IVec3, u32>,
 }
 
 impl Default for WorldSaveDataHeader {
@@ -40,11 +47,14 @@ impl Default for WorldSaveDataHeader {
   }
 }
 
-struct WorldSaveFile {
+#[derive(Unique)]
+pub struct WorldSaveFile {
   pub file: File,
   pub header: WorldSaveDataHeader,
 }
 
+pub type SharedSaveFile = Arc<RwLock<WorldSaveFile>>;
+
 impl WorldSaveFile {
   pub fn new(file: File) -> Self {
     WorldSaveFile {
@@ -82,13 +92,23 @@ impl WorldSaveFile {
     Ok(())
   }
 
+  pub fn initialize(&mut self) -> Result<()> {
+    self.write_header()?;
+    Ok(())
+  }
+
+  pub fn load_data(&mut self) -> Result<()> {
+    self.read_header()?;
+    Ok(())
+  }
+
   fn allocate_sector(&mut self) -> u32 {
     let value = self.header.sector_count + 1;
     self.header.sector_count += 1;
     value
   }
 
-  pub fn save_chunk(&mut self, position: IVec2, data: &BlockDataRef) -> Result<()> {
+  pub fn save_chunk(&mut self, position: IVec3, data: &BlockDataRef) -> Result<()> {
     let mut header_modified = false;
     let sector = self.header.chunk_map.get(&position).copied().unwrap_or_else(|| {
       header_modified = true;
@@ -96,7 +116,8 @@ impl WorldSaveFile {
     });
 
     let offset = sector as u64 * SECTOR_SIZE as u64;
-    //SAFETY: *nuzzles* t-t-twust me pwease OwO
+
+    const_assert_eq!(size_of::<Block>(), 1);
     let data: &[u8; SECTOR_SIZE] = unsafe { std::mem::transmute(data) };
 
     self.file.seek(SeekFrom::Start(offset))?;
@@ -108,4 +129,41 @@ impl WorldSaveFile {
     self.file.sync_data()?;
     Ok(())
   }
+
+  ///TODO partial chunk commit (No need to write whole 32kb for a single block change!)
+  pub fn chunk_set_block() {
+    todo!()
+  }
+
+  pub fn chunk_exists(&self, position: IVec3) -> bool {
+    self.header.chunk_map.contains_key(&position)
+  }
+
+  pub fn load_chunk(&mut self, position: IVec3) -> Result<Option<BlockData>> {
+    let Some(&sector) = self.header.chunk_map.get(&position) else {
+      return Ok(None);
+    };
+
+    let mut buffer = Box::new([0u8; CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE * size_of::<Block>()]);
+    let offset = sector as u64 * SECTOR_SIZE as u64;
+
+    self.file.seek(SeekFrom::Start(offset))?;
+    self.file.read_exact(&mut buffer[..])?;
+
+    //should be safe under these conditions:
+    //Block is a single byte
+    //All block data bytes are in valid range
+    const_assert_eq!(size_of::<Block>(), 1);
+    for &byte in &buffer[..] {
+      let block = Block::try_from_primitive(byte);
+      match block {
+        //Sanity check, not actually required: (should NEVER happen)
+        Ok(block) => debug_assert_eq!(byte, block as u8),
+        Err(_) => anyhow::bail!("invalid block data"),
+      }
+    }
+    let data: BlockData = unsafe { std::mem::transmute(buffer) };
+
+    Ok(Some(data))
+  }
 }

kubi/src/init.rs

@@ -1,9 +1,26 @@
 use shipyard::{AllStoragesView, UniqueViewMut};
-use std::{env, net::SocketAddr};
+use std::{env, net::SocketAddr, fs::OpenOptions, path::{Path, PathBuf}, str::FromStr, sync::{Arc, RwLock}};
+use anyhow::Result;
 use crate::{
   networking::{GameType, ServerAddress},
   state::{GameState, NextState}
 };
+use kubi_shared::data::{WorldSaveFile, SharedSaveFile};
+
+fn open_local_save_file(path: &Path) -> Result<WorldSaveFile> {
+  let mut save_file = WorldSaveFile::new({
+    OpenOptions::new()
+      .read(true)
+      .write(true)
+      .open("world.kbi")?
+  });
+  if save_file.file.metadata().unwrap().len() == 0 {
+    save_file.initialize()?;
+  } else {
+    save_file.load_data()?;
+  }
+  Ok(save_file)
+}
 
 pub fn initialize_from_args(
   all_storages: AllStoragesView,

kubi/src/lib.rs

@@ -6,11 +6,9 @@ use shipyard::{
   NonSendSync, WorkloadModificator,
   SystemModificator
 };
-use glium::{
-  glutin::{
+use glium::glutin::{
   event_loop::{EventLoop, ControlFlow},
   event::{Event, WindowEvent}
-  }
 };
 use glam::vec3;
 use std::time::Instant;