From 9e0ec02fcbb3b82a2a73d2713c41af5a6c4523f9 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Mon, 31 Aug 2026 19:43:16 -0700
Subject: remove ms, use noise + lerp

---
 src/content/world/mines.rs | 126 ++++++---------------------------------------
 1 file changed, 15 insertions(+), 111 deletions(-)

(limited to 'src/content')

diff --git a/src/content/world/mines.rs b/src/content/world/mines.rs
index c9c0aad..d7e23bc 100644
--- a/src/content/world/mines.rs
+++ b/src/content/world/mines.rs
@@ -1,129 +1,33 @@
-use glam::{IVec2, Vec2};
+use fastnoise_lite::{FastNoiseLite, FractalType};
+use glam::IVec2;
 
-use crate::{
-    config::TILESET_SCALING,
-    content::materials::MaterialId,
-    proc_gen::{
-        Biome, TileCells,
-        tileset_loader::{Tile, TilesetPixelType},
-    },
-    sim::{cell::Cell, lib::marching_squares::compute_types},
-};
+use crate::{content::materials::MaterialId, proc_gen::Biome, sim::cell::Cell};
 
-const FULL: [bool; (TILESET_SCALING * TILESET_SCALING) as usize] =
-    [true; (TILESET_SCALING * TILESET_SCALING) as usize];
-
-const EMPTY: [bool; (TILESET_SCALING * TILESET_SCALING) as usize] =
-    [false; (TILESET_SCALING * TILESET_SCALING) as usize];
+const ROUGHNESS: f32 = 0.375;
 
 pub struct MinesBiome {
-    pixel_expansion_by_type: [[bool; (TILESET_SCALING * TILESET_SCALING) as usize]; 16],
-}
-
-fn circular_pixel_expansion(
-    c: Vec2,
-    r: f32,
-) -> [bool; (TILESET_SCALING * TILESET_SCALING) as usize] {
-    let rs = r.powi(2);
-    let mut ret = [false; (TILESET_SCALING * TILESET_SCALING) as usize];
-
-    for y in 0..TILESET_SCALING {
-        for x in 0..TILESET_SCALING {
-            // definitely can be optimized a lot
-            let dist = Vec2::new(x as f32, y as f32).distance_squared(c);
-            if dist <= rs {
-                ret[(x + y * TILESET_SCALING) as usize] = true;
-            }
-        }
-    }
-
-    ret
+    pub edge_roughness: FastNoiseLite,
 }
 
 impl MinesBiome {
     pub fn new() -> Self {
-        MinesBiome {
-            pixel_expansion_by_type: [
-                // empty
-                EMPTY,
-                // BL
-                circular_pixel_expansion(
-                    Vec2::new(0.0, TILESET_SCALING as f32 - 1.0),
-                    TILESET_SCALING as f32,
-                ),
-                // BR
-                circular_pixel_expansion(
-                    Vec2::new(TILESET_SCALING as f32 - 1.0, TILESET_SCALING as f32 - 1.0),
-                    TILESET_SCALING as f32,
-                ),
-                // BL BR
-                FULL,
-                // TR
-                circular_pixel_expansion(
-                    Vec2::new(TILESET_SCALING as f32 - 1.0, 0.0),
-                    TILESET_SCALING as f32,
-                ),
-                // TR BL
-                FULL,
-                // TR BR
-                FULL,
-                // TR BR BL
-                FULL,
-                // TL
-                circular_pixel_expansion(Vec2::new(0.0, 0.0), TILESET_SCALING as f32),
-                // TL BL
-                FULL,
-                // TL BR
-                FULL,
-                // TL BR BL
-                FULL,
-                // TL TR
-                FULL,
-                // TL TR BL
-                FULL,
-                // TL TR BR
-                FULL,
-                // surrounded
-                FULL,
-            ],
-        }
+        let mut edge_roughness = FastNoiseLite::new();
+        edge_roughness.octaves = 2;
+        edge_roughness.fractal_type = FractalType::Ridged;
+        MinesBiome { edge_roughness }
     }
 }
 
 impl Biome for MinesBiome {
-    fn derive_world_from_tile(&self, tile: &Tile) -> TileCells {
-        let pixels = tile.size();
-        let marched_pixels = compute_types(tile);
-        let size = pixels * TILESET_SCALING;
-        let mut cells = vec![Cell::void(); (size.x * size.y) as usize];
-
-        for py in 0..pixels.y {
-            for px in 0..pixels.x {
-                let variant = marched_pixels[(px + py * (pixels.x + 1)) as usize];
-
-                let expansion = self.pixel_expansion_by_type[variant as usize];
-                // TODO optimize
-                let expansion_cells = expansion.map(|c| {
-                    if c {
-                        Cell::from_material(MaterialId::Dirt)
-                    } else {
-                        Cell::void()
-                    }
-                });
+    fn cell(&self, solidity: f32, world: IVec2) -> Cell {
+        let world = world.as_vec2();
 
-                let origin = IVec2::new(px, py) * TILESET_SCALING;
-                for i in 0..TILESET_SCALING {
-                    let dst_y = i + origin.y;
-                    let dst_row = (dst_y * size.x + origin.x) as usize;
-                    let src_row = (i * TILESET_SCALING) as usize;
+        let displacement = ROUGHNESS * self.edge_roughness.get_noise_2d(world.x, world.y);
 
-                    cells[dst_row..dst_row + TILESET_SCALING as usize].copy_from_slice(
-                        &expansion_cells[src_row..src_row + TILESET_SCALING as usize],
-                    );
-                }
-            }
+        if solidity + displacement <= 0.0 {
+            return Cell::void();
         }
 
-        TileCells { size, cells }
+        Cell::from_material(MaterialId::Dirt)
     }
 }
-- 
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