src/game.rs

@@ -2,23 +2,19 @@ use servicepoint::{Grid, Value, ValueGrid};
 
 use crate::rules::Rules;
 
-pub(crate) struct Game<TState, TKernel, const KERNEL_SIZE: usize>
-where
-    TState: Value + PartialEq,
-    TKernel: Value,
+pub(crate) struct Game<T: Value>
 {
-    pub field: ValueGrid<TState>,
-    pub rules: Rules<TState, TKernel, KERNEL_SIZE>,
+    pub field: ValueGrid<T>,
+    pub rules: Rules<T>,
 }
 
-impl<TState: Value + PartialEq, TKernel: Value, const KERNEL_SIZE: usize>
-    Game<TState, TKernel, KERNEL_SIZE>
+impl<T: Value> Game<T>
 {
     pub fn step(&mut self) {
         self.field = self.field_iteration();
     }
 
-    fn field_iteration(&self) -> ValueGrid<TState> {
+    fn field_iteration(&self) -> ValueGrid<T> {
         let mut next = ValueGrid::new(self.field.width(), self.field.height());
         for x in 0..self.field.width() {
             for y in 0..self.field.height() {
@@ -37,14 +33,12 @@ impl<TState: Value + PartialEq, TKernel: Value, const KERNEL_SIZE: usize>
         let mut count = 0;
 
         let kernel = &self.rules.kernel;
-        assert_eq!(KERNEL_SIZE % 2, 1);
-        let offset = KERNEL_SIZE as i32 / 2;
 
         for (kernel_y, kernel_row) in kernel.iter().enumerate() {
-            let offset_y = kernel_y as i32 - offset;
+            let offset_y = kernel_y as i32 - 1;
 
             for (kernel_x, kernel_value) in kernel_row.iter().enumerate() {
-                let offset_x = kernel_x as i32 - offset;
+                let offset_x = kernel_x as i32 - 1;
                 let neighbor_x = x + offset_x;
                 let neighbor_y = y + offset_y;
 

src/rules.rs

@@ -1,28 +1,27 @@
 use rand::rngs::ThreadRng;
 use rand::{thread_rng, Rng};
-
+use servicepoint::Value;
 use crate::print::println_info;
 
-pub struct Rules<TState, TKernel, const KERNEL_SIZE: usize>
-where
-    TState: Copy + PartialEq,
-    TKernel: Copy,
+pub struct Rules<T: Value>
 {
-    pub kernel: [[TKernel; KERNEL_SIZE]; KERNEL_SIZE],
-    pub count_neighbor: Box<dyn Fn(TState, TKernel) -> i32>,
-    pub next_state: Box<dyn Fn(TState, i32) -> TState>,
+    pub kernel: Kernel3x3,
+    pub count_neighbor: Box<dyn Fn(T, bool) -> i32>,
+    pub next_state: Box<dyn Fn(T, i32) -> T>,
 }
 
-pub const MOORE_NEIGHBORHOOD: [[bool; 3]; 3] =
+type Kernel3x3 = [[bool; 3]; 3];
+
+pub const MOORE_NEIGHBORHOOD: Kernel3x3 =
     [[true, true, true], [true, false, true], [true, true, true]];
 
-pub const NEUMANN_NEIGHBORHOOD: [[bool; 3]; 3] = [
+pub const NEUMANN_NEIGHBORHOOD: Kernel3x3 = [
     [false, true, false],
     [true, false, true],
     [false, true, false],
 ];
 
-pub const DIAGONALS_NEIGHBORHOOD: [[bool; 3]; 3] = [
+pub const DIAGONALS_NEIGHBORHOOD: Kernel3x3 = [
     [true, false, true],
     [false, false, false],
     [true, false, true],
@@ -37,16 +36,11 @@ pub fn count_true_neighbor(neighbor_state: bool, kernel_value: bool) -> i32 {
 }
 
 #[must_use]
-pub fn generate_bb3() -> Rules<bool, bool, 3> {
+pub fn generate_bb3() -> Rules<bool> {
     let mut rng = thread_rng();
 
-    let is_moore = rng.gen_bool(1.0 / 2.0);
-    let kernel = if is_moore {
-        MOORE_NEIGHBORHOOD
-    } else {
-        NEUMANN_NEIGHBORHOOD
-    };
-    let max_neighbors = if is_moore { 8 } else { 4 };
+    let kernel = choose_neighborhood(&mut rng);
+    let max_neighbors = count_max_neighbors(kernel);
 
     let birth = generate_neighbor_counts(rng.gen_range(1..=max_neighbors), &mut rng, &[0]);
     let survive = generate_neighbor_counts(rng.gen_range(1..=max_neighbors), &mut rng, &[]);
@@ -76,16 +70,10 @@ fn generate_neighbor_counts(count: u8, rng: &mut ThreadRng, exclude: &[i32]) ->
 }
 
 #[must_use]
-pub fn generate_u8b3() -> Rules<u8, bool, 3> {
+pub fn generate_u8b3() -> Rules<u8> {
     let mut rng = thread_rng();
 
-    let kernel = match rng.gen_range(0..3) {
-        0 => MOORE_NEIGHBORHOOD,
-        1 => NEUMANN_NEIGHBORHOOD,
-        2 => DIAGONALS_NEIGHBORHOOD,
-        _ => panic!(),
-    };
-
+    let kernel = choose_neighborhood(&mut rng);
     let alive_threshold = u8::max(1, rng.gen());
 
     let birth = generate_neighbor_counts(rng.gen_range(1..=9), &mut rng, &[0]);
@@ -113,3 +101,24 @@ pub fn generate_u8b3() -> Rules<u8, bool, 3> {
         }),
     }
 }
+
+fn choose_neighborhood(rng: &mut ThreadRng) -> Kernel3x3 {
+    match rng.gen_range(0..3) {
+        0 => MOORE_NEIGHBORHOOD,
+        1 => NEUMANN_NEIGHBORHOOD,
+        2 => DIAGONALS_NEIGHBORHOOD,
+        _ => unreachable!(),
+    }
+}
+
+fn count_max_neighbors<const SIZE: usize>(kernel: [[bool; SIZE]; SIZE]) -> u8 {
+    let mut result = 0;
+    for row in kernel {
+        for cell in row {
+            if cell {
+                result += 1;
+            }
+        }
+    }
+    result
+}

src/simulation.rs

@@ -11,10 +11,10 @@ use servicepoint::{
 use std::num::Wrapping;
 
 pub(crate) struct Simulation {
-    pub(crate) left_pixels: Game<bool, bool, 3>,
-    pub(crate) right_pixels: Game<bool, bool, 3>,
-    pub(crate) left_luma: Game<u8, bool, 3>,
-    pub(crate) right_luma: Game<u8, bool, 3>,
+    pub(crate) left_pixels: Game<bool>,
+    pub(crate) right_pixels: Game<bool>,
+    pub(crate) left_luma: Game<u8>,
+    pub(crate) right_luma: Game<u8>,
     split_pixel: usize,
     pub(crate) split_speed: i32,
     iteration: Wrapping<u8>,
@@ -64,7 +64,7 @@ impl Simulation {
         std::mem::swap(&mut self.left_pixels, &mut self.right_pixels);
     }
 
-    fn regenerate(pixels: &mut Game<bool, bool, 3>, luma: &mut Game<u8, bool, 3>) {
+    fn regenerate(pixels: &mut Game<bool>, luma: &mut Game<u8>) {
         randomize(&mut pixels.field);
         randomize(&mut luma.field);
         pixels.rules = generate_bb3();
@@ -120,8 +120,8 @@ impl Simulation {
                 &self.right_luma.field
             };
             for y in 0..luma.height() {
-                let set: u8 = left_or_right.get(x, y) / u8::MAX * u8::from(Brightness::MAX);
-                let set = Brightness::try_from(set).unwrap();
+                let set = left_or_right.get(x, y) as f32 / u8::MAX as f32 * u8::from(Brightness::MAX) as f32;
+                let set = Brightness::try_from(set as u8).unwrap();
                 luma.set(x, y, set);
             }
         }
@@ -161,9 +161,9 @@ fn make_randomized<T: Value>(width: usize, height: usize) -> ValueGrid<T>
 where
     Standard: Distribution<T>,
 {
-    let mut pixels = ValueGrid::new(width, height);
-    randomize(&mut pixels);
-    pixels
+    let mut grid = ValueGrid::new(width, height);
+    randomize(&mut grid);
+    grid
 }
 
 fn randomize<T: Value>(field: &mut ValueGrid<T>)