From 8e128d3ca24fa10dc7d871f7daf6c43eaddc385c Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 30 Aug 2026 20:10:07 -0700
Subject: wip biome abstraction

---
 src/proc_gen/herringbone.rs | 46 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 37 insertions(+), 9 deletions(-)

(limited to 'src/proc_gen/herringbone.rs')

diff --git a/src/proc_gen/herringbone.rs b/src/proc_gen/herringbone.rs
index 5e930ec..271b7a1 100644
--- a/src/proc_gen/herringbone.rs
+++ b/src/proc_gen/herringbone.rs
@@ -3,12 +3,10 @@ use glam::IVec2;
 
 use crate::{
     config::TILESET_SCALING,
-    content::materials::MaterialId,
     proc_gen::tileset_loader::{Tile, TileOrientation, Tileset, TilesetPixelType},
-    sim::cell::Cell,
 };
 
-fn split_position(world: IVec2, tileset: &Tileset) -> (IVec2, IVec2, TileOrientation) {
+pub fn split_position(world: IVec2, tileset: &Tileset) -> (IVec2, IVec2, TileOrientation) {
     let s = tileset.dimensions.short as i32;
     let tx = world.x.div_euclid(s);
     let ty = world.y.div_euclid(s);
@@ -74,10 +72,40 @@ fn get_pixel_at_position(world: IVec2, tileset: &Tileset) -> TilesetPixelType {
     tile.pixels[(local.x + local.y * width) as usize]
 }
 
-pub fn get_cell_at_position(world: IVec2, tileset: &Tileset) -> Cell {
-    let pixel = get_pixel_at_position(world, tileset);
-    match pixel {
-        TilesetPixelType::Void => Cell::void(),
-        TilesetPixelType::Terrain => Cell::from_material(MaterialId::Dirt),
-    }
+pub fn tiles_overlapping(
+    a: IVec2,
+    b: IVec2,
+    tileset: &Tileset,
+) -> impl Iterator<Item = (IVec2, &Tile, TileOrientation)> {
+    let s = IVec2::new(
+        tileset.dimensions.short as i32,
+        tileset.dimensions.short as i32,
+    );
+
+    let ta = a.div_euclid(s) - 1;
+    let tb = (b - 1).div_euclid(s);
+
+    (ta.y..=tb.y)
+        .flat_map(move |ty| (ta.x..=tb.x).map(move |tx| (tx, ty)))
+        .filter_map(move |(tx, ty)| match (tx - ty).rem_euclid(4) {
+            0 => Some((
+                IVec2::new(tx, ty),
+                pick_variant(IVec2::new(tx, ty), TileOrientation::Horizontal, tileset),
+                TileOrientation::Horizontal,
+            )),
+            3 => Some((
+                IVec2::new(tx, ty),
+                pick_variant(IVec2::new(tx, ty), TileOrientation::Vertical, tileset),
+                TileOrientation::Vertical,
+            )),
+            _ => None,
+        })
 }
+
+// pub fn get_cell_at_position(world: IVec2, tileset: &Tileset) -> Cell {
+//     let pixel = get_pixel_at_position(world, tileset);
+//     match pixel {
+//         TilesetPixelType::Void => Cell::void(),
+//         TilesetPixelType::Terrain => Cell::from_material(MaterialId::Dirt),
+//     }
+// }
-- 
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