From 5b0817b3187d14c8c7931823d848a0ede4f3b040 Mon Sep 17 00:00:00 2001
From: griffi-gh <prasol258@gmail.com>
Date: Sat, 21 Jan 2023 03:40:23 +0100
Subject: [PATCH] WIP Chunk loading

---
 src/main.rs          |  2 ++
 src/player.rs        |  6 +++++
 src/settings.rs      |  2 +-
 src/world/loading.rs | 61 ++++++++++++++++++++++++++++++++++++--------
 4 files changed, 59 insertions(+), 12 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 235edde..b27a5c0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,6 +25,7 @@ use rendering::{Rederer, RenderTarget, BackgroundColor, clear_background};
 use player::spawn_player;
 use world::{GameWorld, loading::load_world_around_player};
 use prefabs::load_prefabs;
+use settings::GameSettings;
 
 #[derive(Unique)]
 pub(crate) struct DeltaTime(Duration);
@@ -64,6 +65,7 @@ fn main() {
   );
   world.add_unique(BackgroundColor(vec3(0.5, 0.5, 1.)));
   world.add_unique(DeltaTime(Duration::default()));
+  world.add_unique(GameSettings::default());
 
   //Register workloads
   world.add_workload(startup);
diff --git a/src/player.rs b/src/player.rs
index 5052205..9990f65 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -3,22 +3,28 @@ use shipyard::{Component, EntitiesViewMut, ViewMut};
 
 use crate::transform::Transform;
 
+#[derive(Component)]
+pub struct LocalPlayer;
+
 #[derive(Component)]
 pub struct Player;
 
 pub fn spawn_player (
   mut entities: EntitiesViewMut,
   mut vm_player: ViewMut<Player>,
+  mut vm_local_player: ViewMut<LocalPlayer>,
   mut vm_transform: ViewMut<Transform>
 ) {
   log::info!("spawning player");
   entities.add_entity(
     (
       &mut vm_player,
+      &mut vm_local_player,
       &mut vm_transform
     ),
     (
       Player,
+      LocalPlayer,
       Transform(Mat4::default())
     )
   );
diff --git a/src/settings.rs b/src/settings.rs
index 9b52fd2..df9cd49 100644
--- a/src/settings.rs
+++ b/src/settings.rs
@@ -3,7 +3,7 @@ use shipyard::Unique;
 #[derive(Unique)]
 pub struct GameSettings {
   //there's a 1 chunk border of loaded but invisible around this
-  pub render_distance: usize,
+  pub render_distance: u8,
 }
 impl Default for GameSettings {
   fn default() -> Self {
diff --git a/src/world/loading.rs b/src/world/loading.rs
index 551cfd1..bb42a57 100644
--- a/src/world/loading.rs
+++ b/src/world/loading.rs
@@ -1,13 +1,52 @@
-use shipyard::{View, UniqueViewMut, NonSendSync, IntoIter};
-use crate::{player::Player, transform::Transform};
-use super::GameWorld;
+use glam::ivec3;
+use shipyard::{View, UniqueView, UniqueViewMut, NonSendSync, IntoIter, Workload, IntoWorkload};
+use crate::{player::LocalPlayer, transform::Transform, settings::GameSettings};
+use super::{GameWorld, chunk::{ChunkState, CHUNK_SIZE}};
 
-pub fn load_world_around_player(
-  v_player: View<Player>,
-  v_transform: View<Transform>,
-  vm_world: NonSendSync<UniqueViewMut<GameWorld>>,
-) {
-  for (player, transform) in (&v_player, v_transform.inserted_or_modified()).iter() {
-
-  }
+pub fn load_world_around_player() -> Workload {
+  (
+    mark_chunks,
+  ).into_workload()
+}
+
+pub fn mark_chunks(
+  v_settings: UniqueView<GameSettings>,
+  v_local_player: View<LocalPlayer>,
+  v_transform: View<Transform>,
+  mut vm_world: NonSendSync<UniqueViewMut<GameWorld>>,
+) {
+  //Read game settings
+  let load_distance = (v_settings.render_distance + 1) as i32;
+  
+  //Check if a player moved
+  let Some((_, transform)) = (&v_local_player, v_transform.inserted_or_modified()).iter().next() else {
+    return
+  };
+
+  //If it did, get it's position and current chunk
+  let position = transform.0.to_scale_rotation_translation().2;
+  let at_chunk = position.as_ivec3() / CHUNK_SIZE as i32;
+
+  //Then, mark *ALL* chunks with ToUnload
+  for (_, chunk) in &mut vm_world.chunks {
+    chunk.desired_state = ChunkState::ToUnload;
+  }
+
+  //Then mark chunks that are near to the player
+  for x in -load_distance..=load_distance {
+    for y in -load_distance..=load_distance {
+      for z in -load_distance..=load_distance {
+        let chunk_pos_offset = ivec3(x, y, z);
+        let is_border = chunk_pos_offset.to_array()
+          .iter().any(|x| x.abs() == load_distance);
+        let desired = match is_border {
+          true  => ChunkState::Loaded,
+          false => ChunkState::Rendered,
+        };
+      }
+    }
+  }
+
+  //TODO
+  todo!()
 }