src/cell.rs

@@ -1,20 +0,0 @@
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub enum CellType {
-    Empty = 0,
-    Sand,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub enum MovementType {
-    None = 0b0000_0000,
-    Down = 0b0000_0001,
-    Side = 0b0000_0010,
-    DownSide = 0b0000_0011,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub struct Cell {
-    pub cell_type: CellType,
-    pub movement_type: MovementType,
-    pub color: u32,
-}

src/engine.rs

@@ -5,15 +5,13 @@ use minifb::{Key, Window, WindowOptions};
 const WIDTH: usize = 800;
 const HEIGHT: usize = 600;
 
-use crate::{materials::*, rand::Random, world::World};
+use crate::{materials::*, rand::Random};
 
 pub struct Engine {
     pub window: Window,
-    pub front_buffer: Vec<u32>,
+    pub buffer: Vec<u32>,
     pub brush_size: usize,
     pub random: Random,
-
-    pub world: World,
 }
 
 impl Engine {
@@ -28,10 +26,9 @@ impl Engine {
             .unwrap_or_else(|e| {
                 panic!("{}", e);
             }),
-            front_buffer: vec![0; WIDTH * HEIGHT],
+            buffer: vec![0; WIDTH * HEIGHT],
             brush_size: 1,
             random: Random::new(0),
-            world: World::new(),
         }
     }
 
@@ -86,13 +83,19 @@ impl Engine {
             for x in 0..WIDTH {
                 for y in 0..HEIGHT {
                     let index = xy_to_i(x, y);
-                    let cell = self.front_buffer[index];
+                    let cell = self.buffer[index];
 
                     if cell == SAND {
                         let down = self.is_empty(x, y + 1);
-                        let random = self.random.random_bool();
+                        let mut left = self.is_empty(x - 1, y + 1);
-                        let left = self.is_empty(x - 1, y + 1) && random;
+                        let mut right = self.is_empty(x + 1, y + 1);
-                        let right = self.is_empty(x + 1, y + 1) ^ left;
+
+                        if left && right {
+                            // TODO: handle left/right randomization here
+                            let rand = self.random.random_bool();
+                            left = rand;
+                            right = !rand;
+                        }
 
                         if down {
                             self.set_cell(x, y + 1, SAND)
@@ -110,7 +113,7 @@ impl Engine {
             }
             // TODO Handle this.
             self.window
-                .update_with_buffer(&self.front_buffer, WIDTH, HEIGHT)
+                .update_with_buffer(&self.buffer, WIDTH, HEIGHT)
                 .unwrap();
         }
     }
@@ -119,18 +122,18 @@ impl Engine {
 impl Engine {
     fn is_empty(&mut self, x: usize, y: usize) -> bool {
         let index = xy_to_i(x, y);
-        if index >= self.front_buffer.len() {
+        if index >= self.buffer.len() {
             false
         } else {
-            self.front_buffer[index] == EMPTY
+            self.buffer[index] == EMPTY
         }
     }
 
     fn set_cell(&mut self, x: usize, y: usize, mat: u32) {
         let index = xy_to_i(x, y);
-        if index >= self.front_buffer.len() {
+        if index >= self.buffer.len() {
         } else {
-            self.front_buffer[index] = mat;
+            self.buffer[index] = mat;
         }
     }
 
@@ -138,7 +141,7 @@ impl Engine {
         for x in 0..WIDTH {
             for y in 0..HEIGHT {
                 let index = xy_to_i(x, y);
-                self.front_buffer[index] = EMPTY;
+                self.buffer[index] = EMPTY;
             }
         }
     }

src/main.rs

@@ -1,8 +1,6 @@
-mod cell;
 mod engine;
 mod materials;
 mod rand;
-mod world;
 
 fn main() {
     let mut engine = engine::Engine::new();

src/world.rs

@@ -1,79 +0,0 @@
-use crate::cell::{Cell, MovementType};
-
-use crate::cell::CellType::Empty;
-use crate::engine::xy_to_i;
-use crate::materials::EMPTY;
-
-const WIDTH: usize = 800;
-const HEIGHT: usize = 600;
-pub struct Change {
-    x_from: usize,
-    x_to: usize,
-    y_from: usize,
-    y_to: usize,
-}
-
-pub struct World {
-    pub width: usize,
-    pub height: usize,
-    pub cells: Vec<Cell>,
-    changes: Vec<Change>,
-}
-impl World {
-    pub fn new() -> Self {
-        Self {
-            width: WIDTH,
-            height: HEIGHT,
-            cells: vec![
-                Cell {
-                    cell_type: Empty,
-                    movement_type: MovementType::None,
-                    color: 0
-                };
-                WIDTH * HEIGHT
-            ],
-            changes: vec![],
-        }
-    }
-}
-
-impl World {
-    pub fn get_xy(&mut self, x: usize, y: usize) -> Cell {
-        let index = x + self.width * y;
-
-        self.cells[index]
-    }
-
-    pub fn get_i(&mut self, index: usize) -> Cell {
-        self.cells[index]
-    }
-
-    pub fn is_empty(&mut self, x: usize, y: usize) -> bool {
-        in_bounds(x, y) && self.get_xy(x, y).cell_type == Empty
-    }
-
-    pub fn set_xy(&mut self, x: usize, y: usize, cell: Cell) {
-        self.cells[xy_to_i(x, y)] = cell
-    }
-
-    // Collect all the changes to the world and push them into a changes vec
-    pub fn move_cell(&mut self, x: usize, y: usize, xto: usize, yto: usize) {
-        let change = Change {
-            x_from: x,
-            x_to: xto,
-            y_from: y,
-            y_to: yto,
-        };
-
-        self.changes.push(change);
-    }
-    // Takes the changes to the world and applies them.
-    pub fn commit_cells() {}
-}
-
-pub fn in_bounds(x: usize, y: usize) -> bool {
-    let x_in_bounds = x < WIDTH;
-    let y_in_bounds = y < HEIGHT;
-
-    x_in_bounds && y_in_bounds
-}