resizable game window

Cargo.toml

@@ -5,3 +5,8 @@ edition = "2021"
 
 [dependencies]
 rand = "0.9.0"
+rodio = "0.20.1"
+
+[dependencies.sdl2]
+version = "0.37.0"
+features = ["ttf"]

src/actions.rs

@@ -1,7 +1,7 @@
 use std::collections::HashMap;
 
 #[derive(Hash, PartialEq, Eq)]
-pub enum Controls {
+pub enum Action {
     Left,
     Right,
     SoftDrop,
@@ -11,17 +11,20 @@ pub enum Controls {
     RotateCcw,
 }
 
-pub struct ControlsHeld(HashMap<Controls, usize>);
+pub struct ActionsHeld(HashMap<Action, usize>);
 
-impl ControlsHeld {
-    pub fn just_pressed(&self, ticks: usize, control: &Controls) -> bool {
+impl ActionsHeld {
+    pub fn new() -> Self {
+        Self(HashMap::new())
+    }
+    pub fn just_pressed(&self, ticks: usize, control: &Action) -> bool {
         self.held_for(ticks, control, |held_for| held_for == 0)
     }
 
     pub fn held_for<F: Fn(usize) -> bool>(
         &self,
         ticks: usize,
-        control: &Controls,
+        control: &Action,
         functor: F,
     ) -> bool {
         self.get(control)
@@ -30,15 +33,15 @@ impl ControlsHeld {
     }
 }
 
-impl std::ops::Deref for ControlsHeld {
-    type Target = HashMap<Controls, usize>;
+impl std::ops::Deref for ActionsHeld {
+    type Target = HashMap<Action, usize>;
 
     fn deref(&self) -> &Self::Target {
         &self.0
     }
 }
 
-impl std::ops::DerefMut for ControlsHeld {
+impl std::ops::DerefMut for ActionsHeld {
     fn deref_mut(&mut self) -> &mut Self::Target {
         &mut self.0
     }

src/board.rs

@@ -1,6 +1,6 @@
 use std::ops::{Deref, DerefMut};
 
-use crate::{CurrentTetromino, Tetromino};
+use crate::{game::CurrentTetromino, Tetromino};
 
 #[derive(PartialEq)]
 pub struct Board([[Option<Tetromino>; Self::WIDTH]; Self::HEIGHT]);
@@ -28,26 +28,35 @@ impl Board {
         Board(board)
     }
 
-    pub fn colliding(
+    pub fn lowest_y(
         &self,
         CurrentTetromino {
             tetromino,
             direction,
-            x: cur_x,
-            y: cur_y,
+            x,
+            y,
         }: &CurrentTetromino,
-    ) -> bool {
+    ) -> i8 {
         let pattern = tetromino.direction_pattern(direction);
+        let mut y = *y;
+        loop {
+            if self.pattern_and_position_colliding(pattern, *x, y) {
+                break y - 1;
+            }
+            y += 1;
+        }
+    }
 
-        for (y, row) in pattern.iter().enumerate() {
-            for x in row
+    fn pattern_and_position_colliding(&self, pattern: [[bool; 4]; 4], x: i8, y: i8) -> bool {
+        for (y_offset, row) in pattern.iter().enumerate() {
+            for x_offset in row
                 .iter()
                 .enumerate()
                 .filter(|(_, exists)| **exists)
                 .map(|(x, _)| x)
             {
-                let x = x as i8 + cur_x;
-                let y = y as i8 + cur_y;
+                let x = x_offset as i8 + x;
+                let y = y_offset as i8 + y;
 
                 if y < 0 {
                     continue;
@@ -70,6 +79,19 @@ impl Board {
         false
     }
 
+    pub fn colliding(
+        &self,
+        CurrentTetromino {
+            tetromino,
+            direction,
+            x,
+            y,
+        }: &CurrentTetromino,
+    ) -> bool {
+        let pattern = tetromino.direction_pattern(direction);
+        self.pattern_and_position_colliding(pattern, *x, *y)
+    }
+
     pub fn lines_cleared(&mut self) -> usize {
         let line_clears: Vec<_> = self
             .iter()

src/game.rs

@@ -0,0 +1,317 @@
+use crate::actions::{Action, ActionsHeld};
+use crate::board::Board;
+use crate::tetromino::{Direction, DirectionDiff, Tetromino};
+
+pub struct CurrentTetromino {
+    pub tetromino: Tetromino,
+    pub direction: Direction,
+    pub x: i8,
+    pub y: i8,
+}
+
+impl CurrentTetromino {
+    fn new(tetromino: Tetromino) -> Self {
+        const PIECE_WIDTH: i8 = 2;
+        Self {
+            tetromino,
+            direction: Direction::Up,
+            x: (Board::WIDTH as i8 - PIECE_WIDTH) / 2,
+            y: -1,
+        }
+    }
+}
+
+pub struct Game {
+    pub game_over: bool,
+    pub board: Board,
+    pub next_tetrominos: [Tetromino; 3],
+    pub current_tetromino: CurrentTetromino,
+    pub held_tetromino: Option<Tetromino>,
+    has_swapped_held: bool,
+    pub score: Score,
+    pub ticks: usize,
+}
+
+pub enum SoundEffect {
+    HardDrop,
+    LineClear(usize),
+    Move,
+    Rotation,
+}
+
+pub struct Score {
+    pub level: usize,
+    pub points: usize,
+    pub lines: usize,
+    pub combo: usize,
+    back_to_back: bool,
+}
+
+impl Score {
+    const fn new() -> Self {
+        Self {
+            level: 0,
+            points: 0,
+            lines: 0,
+            combo: 0,
+            back_to_back: false,
+        }
+    }
+
+    fn level_up(&mut self, lines_cleared: usize) {
+        self.lines += lines_cleared;
+        if self.lines > self.level * 5 {
+            self.level += 1;
+            self.lines = 0;
+        }
+    }
+
+    fn point_multiplier_from_lines_cleared(lines_cleared: usize) -> f32 {
+        match lines_cleared {
+            0 => 0.0,
+            1 => 100.0,
+            2 => 300.0,
+            3 => 500.0,
+            4 => 800.0,
+            _ => unreachable!("we cannot clear more than 4 lines"),
+        }
+    }
+
+    fn combos(&self, lines_cleared: usize) -> usize {
+        if lines_cleared > 0 {
+            self.combo * 50 * self.level
+        } else {
+            0
+        }
+    }
+}
+
+impl Game {
+    pub fn new() -> Self {
+        Self {
+            game_over: false,
+            board: Board::new(),
+            next_tetrominos: std::array::from_fn(|_| Tetromino::random()),
+            current_tetromino: CurrentTetromino::new(Tetromino::random()),
+            held_tetromino: None,
+            has_swapped_held: false,
+            score: Score::new(),
+            ticks: 0,
+        }
+    }
+    fn take_next_in_bag(&mut self, mut last: Tetromino) -> Tetromino {
+        for value in self.next_tetrominos.iter_mut().rev() {
+            std::mem::swap(value, &mut last)
+        }
+        last
+    }
+
+    fn try_hard_drop(&mut self, actions: &ActionsHeld, effects: &mut Vec<SoundEffect>) {
+        if !actions.just_pressed(self.ticks, &Action::HardDrop) {
+            return;
+        }
+        let start_y = self.current_tetromino.y;
+        loop {
+            self.current_tetromino.y += 1;
+            if !self.board.colliding(&self.current_tetromino) {
+                continue;
+            }
+            self.current_tetromino.y -= 1;
+            self.score.points += (self.current_tetromino.y - start_y) as usize * 2;
+            self.place_current_tetromino();
+            self.check_line_clears(effects);
+            break;
+        }
+    }
+
+    fn soft_drop(&mut self, actions: &ActionsHeld, effects: &mut Vec<SoundEffect>) {
+        let mut delay = 32 - self.score.level * 2;
+        if actions.contains_key(&Action::SoftDrop) {
+            delay /= 10;
+        }
+
+        if self.ticks % delay != 0 {
+            return;
+        }
+
+        self.current_tetromino.y += 1;
+        if self.board.colliding(&self.current_tetromino) {
+            self.current_tetromino.y -= 1;
+            self.place_current_tetromino();
+            self.check_line_clears(effects);
+        } else if actions.contains_key(&Action::SoftDrop) {
+            self.score.points += 1;
+        }
+    }
+
+    fn try_move_horizontally(&mut self, actions: &ActionsHeld, effects: &mut Vec<SoundEffect>) {
+        for key in [Action::Left, Action::Right] {
+            let just_pressed = actions.just_pressed(self.ticks, &key);
+            let long_press = actions.held_for(self.ticks, &key, |held_for| held_for > 15);
+            if !just_pressed && !long_press {
+                continue;
+            }
+            let offset = match key {
+                Action::Left => -1,
+                Action::Right => 1,
+                _ => unreachable!(),
+            };
+            self.current_tetromino.x += offset;
+            if self.board.colliding(&self.current_tetromino) {
+                self.current_tetromino.x -= offset;
+            } else {
+                effects.push(SoundEffect::Move);
+            }
+        }
+    }
+
+    fn check_line_clears(&mut self, effects: &mut Vec<SoundEffect>) {
+        let lines_cleared = self.board.lines_cleared();
+
+        self.score.level_up(lines_cleared);
+
+        let mut points =
+            self.score.level as f32 * Score::point_multiplier_from_lines_cleared(lines_cleared);
+
+        if self.score.back_to_back && lines_cleared == 4 {
+            points *= 1.5;
+        }
+        points += self.score.combos(lines_cleared) as f32;
+
+        self.score.points += points as usize;
+
+        if lines_cleared == 4 {
+            self.score.back_to_back = true;
+        } else if lines_cleared > 0 {
+            self.score.back_to_back = false;
+        }
+
+        if lines_cleared > 0 {
+            self.score.combo += 1;
+            effects.push(SoundEffect::LineClear(lines_cleared));
+        } else {
+            self.score.combo = 0;
+            effects.push(SoundEffect::HardDrop);
+        }
+    }
+
+    pub fn step(&mut self, actions: &ActionsHeld) -> Vec<SoundEffect> {
+        if self.game_over {
+            panic!("should check if game is over before stepping");
+        }
+        let mut effects = Vec::new();
+        self.try_hard_drop(actions, &mut effects);
+        self.soft_drop(actions, &mut effects);
+        self.try_move_horizontally(actions, &mut effects);
+
+        if actions.just_pressed(self.ticks, &Action::Swap) {
+            self.try_swap_tetromino(&mut effects);
+        }
+
+        for (control, direction) in [
+            (Action::RotateCw, DirectionDiff::Cw),
+            (Action::RotateCcw, DirectionDiff::Ccw),
+        ] {
+            if !actions.just_pressed(self.ticks, &control) {
+                continue;
+            }
+            self.try_rotate(direction, &mut effects);
+        }
+        self.ticks += 1;
+        effects
+    }
+
+    fn try_rotate(&mut self, diff: DirectionDiff, effects: &mut Vec<SoundEffect>) {
+        let rotated = self.current_tetromino.direction.rotate(&diff);
+        let old_direction = std::mem::replace(&mut self.current_tetromino.direction, rotated);
+        if !self.board.colliding(&self.current_tetromino) {
+            effects.push(SoundEffect::Rotation);
+            return;
+        }
+        let wall_kicks = self
+            .current_tetromino
+            .tetromino
+            .wall_kicks(&old_direction, &diff);
+
+        for (x, y) in wall_kicks {
+            self.current_tetromino.x += x;
+            self.current_tetromino.y += y;
+            if !(self.board.colliding(&self.current_tetromino)) {
+                effects.push(SoundEffect::Rotation);
+                return;
+            }
+            self.current_tetromino.x -= x;
+            self.current_tetromino.y -= y;
+        }
+
+        self.current_tetromino.direction = old_direction;
+    }
+
+    fn place_current_tetromino(&mut self) {
+        let next = CurrentTetromino::new(self.take_next_in_bag(Tetromino::random()));
+        let current = std::mem::replace(&mut self.current_tetromino, next);
+        let pattern = current.tetromino.direction_pattern(&current.direction);
+
+        if current.y <= 0 {
+            self.game_over = true;
+        }
+
+        for (y, row) in pattern.iter().enumerate() {
+            for x in row
+                .iter()
+                .enumerate()
+                .filter(|(_, exists)| **exists)
+                .map(|(x, _)| x)
+            {
+                let y = current.y + y as i8;
+                if y < 0 {
+                    continue;
+                }
+                let y = y as usize;
+                let x = (current.x + x as i8) as usize;
+                self.board[y][x] = Some(current.tetromino.clone());
+            }
+        }
+
+        self.has_swapped_held = false;
+    }
+
+    fn try_swap_tetromino(&mut self, effects: &mut Vec<SoundEffect>) {
+        if self.has_swapped_held {
+            return;
+        }
+        self.has_swapped_held = true;
+        let held_or_first_in_bag_tetromino = self
+            .held_tetromino
+            .take()
+            .unwrap_or_else(|| self.take_next_in_bag(Tetromino::random()));
+        let current_tetromino = CurrentTetromino::new(held_or_first_in_bag_tetromino);
+        let old_tetromino = std::mem::replace(&mut self.current_tetromino, current_tetromino);
+        self.held_tetromino.replace(old_tetromino.tetromino);
+        effects.push(SoundEffect::Rotation);
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::{Board, CurrentTetromino, Game, Score, Tetromino};
+
+    #[test]
+    fn advance_bag() {
+        let mut game = Game {
+            game_over: false,
+            board: Board::new(),
+            score: Score::new(),
+            next_tetrominos: [Tetromino::I, Tetromino::J, Tetromino::O],
+            current_tetromino: CurrentTetromino::new(Tetromino::J),
+            held_tetromino: None,
+            has_swapped_held: false,
+            ticks: 0,
+        };
+        assert_eq!(game.take_next_in_bag(Tetromino::S), Tetromino::I);
+        assert_eq!(
+            game.next_tetrominos,
+            [Tetromino::J, Tetromino::O, Tetromino::S]
+        );
+    }
+}

src/gui.rs

@@ -0,0 +1,5 @@
+mod audio;
+mod sdl;
+mod ui;
+
+pub use sdl::start_game;

src/gui/audio.rs

@@ -0,0 +1,99 @@
+use std::{fs::File, io::BufReader, sync::mpsc};
+
+use rodio::{Decoder, OutputStream, OutputStreamHandle, Sink, Source};
+
+use crate::game::SoundEffect;
+
+fn source_from_path<P: AsRef<std::path::Path>>(path: P) -> Decoder<BufReader<File>> {
+    let file = BufReader::new(File::open(path).unwrap());
+    let source = Decoder::new(file).unwrap();
+    source
+}
+
+fn play_audio<P: AsRef<std::path::Path>>(
+    stream_handle: &OutputStreamHandle,
+    sink: &mut Option<Sink>,
+    path: P,
+    volume: f32,
+) {
+    let source = source_from_path(path);
+    *sink = Sink::try_new(&stream_handle).ok();
+    if let Some(sink) = sink {
+        sink.set_volume(volume);
+        sink.append(source);
+    }
+}
+
+pub enum Command {
+    ToggleMuted,
+    PlayEffect(SoundEffect),
+}
+
+pub fn audio_thread() -> mpsc::Sender<Command> {
+    let (sender, receiver) = mpsc::channel::<Command>();
+
+    let _ = std::thread::spawn(move || {
+        let (_stream, stream_handle) = OutputStream::try_default().unwrap();
+        let music_sink = Sink::try_new(&stream_handle).unwrap();
+        let mut hard_drop_sink = None;
+        let mut line_clear_sink = None;
+        let mut move_sink = None;
+        let mut rotation_sink = None;
+        let mut muted = false;
+
+        music_sink.append(source_from_path("resources/music.ogg").repeat_infinite());
+
+        loop {
+            let Ok(cmd) = receiver.recv() else {
+                break;
+            };
+
+            let effect = match cmd {
+                Command::ToggleMuted => {
+                    muted = !muted;
+                    if muted {
+                        music_sink.pause();
+                    } else {
+                        music_sink.play();
+                    }
+                    continue;
+                }
+                Command::PlayEffect(effect) => effect,
+            };
+
+            if muted {
+                continue;
+            }
+
+            let base_volume = 0.5;
+            match effect {
+                SoundEffect::HardDrop => play_audio(
+                    &stream_handle,
+                    &mut hard_drop_sink,
+                    "resources/hard_drop.ogg",
+                    base_volume,
+                ),
+                SoundEffect::LineClear(lines_cleared) => play_audio(
+                    &stream_handle,
+                    &mut line_clear_sink,
+                    "resources/line_clear.ogg",
+                    base_volume + (lines_cleared as f32 - 1.0) * 0.5,
+                ),
+                SoundEffect::Move => play_audio(
+                    &stream_handle,
+                    &mut move_sink,
+                    "resources/move.ogg",
+                    base_volume,
+                ),
+                SoundEffect::Rotation => play_audio(
+                    &stream_handle,
+                    &mut rotation_sink,
+                    "resources/rotation.ogg",
+                    base_volume,
+                ),
+            };
+        }
+    });
+
+    sender
+}

src/gui/sdl.rs

@@ -0,0 +1,223 @@
+use crate::actions::{Action, ActionsHeld};
+use crate::game::Game;
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::pixels::Color;
+use sdl2::rect::Rect;
+use sdl2::render::{Texture, TextureCreator, WindowCanvas};
+use sdl2::ttf::Sdl2TtfContext;
+use std::time::Duration;
+
+use super::audio::{self};
+use super::ui::{GameUiCtx, Rgb, UiCtx};
+
+const WIDTH: i32 = 1000;
+const HEIGHT: i32 = 800;
+
+fn font_texture<'font, 'a, P: AsRef<std::path::Path>, Text: AsRef<str>, C>(
+    font: P,
+    text: Text,
+    ttf_context: &'a Sdl2TtfContext,
+    texture_creator: &'font TextureCreator<C>,
+) -> Result<Texture<'font>, String> {
+    let font = ttf_context.load_font(font, 24)?;
+    let game_over_text = font
+        .render(text.as_ref())
+        .solid(Color::RGB(255, 255, 255))
+        .map_err(|err| err.to_string())?;
+    let texture = texture_creator
+        .create_texture_from_surface(game_over_text)
+        .map_err(|err| err.to_string())?;
+
+    Ok(texture)
+}
+
+struct SdlUiCtx {
+    canvas: WindowCanvas,
+    ttf: Sdl2TtfContext,
+}
+
+impl SdlUiCtx {
+    fn present(&mut self) {
+        self.canvas.present();
+    }
+}
+
+impl UiCtx<String> for SdlUiCtx {
+    fn window_size(&self) -> Result<(i32, i32), String> {
+        let (width, height) = self.canvas.window().size();
+        Ok((width as i32, height as i32))
+    }
+
+    fn fill_rect(
+        &mut self,
+        x: i32,
+        y: i32,
+        width: i32,
+        height: i32,
+        rgb: &super::ui::Rgb,
+    ) -> Result<(), String> {
+        self.canvas.set_draw_color(Color::RGB(rgb.0, rgb.1, rgb.2));
+        self.canvas
+            .fill_rect(Rect::new(x, y, width as u32, height as u32))?;
+        Ok(())
+    }
+
+    fn outline_rect(
+        &mut self,
+        x: i32,
+        y: i32,
+        width: i32,
+        height: i32,
+        rgb: &super::ui::Rgb,
+    ) -> Result<(), String> {
+        self.canvas.set_draw_color(Color::RGB(rgb.0, rgb.1, rgb.2));
+        self.canvas
+            .draw_rect(Rect::new(x, y, width as u32, height as u32))?;
+        Ok(())
+    }
+
+    fn text_size<P: AsRef<std::path::Path>, Text: AsRef<str>>(
+        &mut self,
+        font: P,
+        text: Text,
+    ) -> Result<(i32, i32), String> {
+        let texture_creator = self.canvas.texture_creator();
+        let texture = font_texture(font, text, &self.ttf, &texture_creator)?;
+        let query = texture.query();
+        Ok((query.width as i32, query.height as i32))
+    }
+
+    fn fill_text<P: AsRef<std::path::Path>, Text: AsRef<str>>(
+        &mut self,
+        font: P,
+        text: Text,
+        x: i32,
+        y: i32,
+        width: i32,
+        height: i32,
+    ) -> Result<(), String> {
+        let texture_creator = self.canvas.texture_creator();
+        let texture = font_texture(font, text, &self.ttf, &texture_creator)?;
+        self.canvas.copy(
+            &texture,
+            None,
+            Some(Rect::new(x, y, width as u32, height as u32)),
+        )?;
+        Ok(())
+    }
+
+    fn clear(&mut self, rgb: &Rgb) -> Result<(), String> {
+        self.canvas.set_draw_color(Color::RGB(rgb.0, rgb.1, rgb.2));
+        self.canvas.clear();
+        Ok(())
+    }
+}
+
+pub fn start_game() -> Result<(), String> {
+    let mut game = Game::new();
+    let mut actions = ActionsHeld::new();
+    let mut paused = false;
+
+    let audio_thread = audio::audio_thread();
+
+    let sdl_context = sdl2::init()?;
+    let ttf_context = sdl2::ttf::init().unwrap();
+    let video_subsystem = sdl_context.video()?;
+
+    let window = video_subsystem
+        .window("reimtris2", WIDTH as u32, HEIGHT as u32)
+        .resizable()
+        .position_centered()
+        .build()
+        .unwrap();
+
+    let canvas = window.into_canvas().build().unwrap();
+    let mut ctx = SdlUiCtx {
+        canvas,
+        ttf: ttf_context,
+    };
+    let mut event_pump = sdl_context.event_pump()?;
+    'running: loop {
+        ctx.clear(&Rgb(16, 16, 16))?;
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit { .. }
+                | Event::KeyDown {
+                    keycode: Some(Keycode::Escape),
+                    ..
+                } => break 'running Ok(()),
+                Event::KeyDown {
+                    keycode: Some(keycode),
+                    ..
+                } => {
+                    let keycode = match keycode {
+                        Keycode::Return if !paused && game.game_over => {
+                            game = Game::new();
+                            continue;
+                        }
+                        Keycode::M => {
+                            audio_thread.send(audio::Command::ToggleMuted).unwrap();
+                            continue;
+                        }
+
+                        Keycode::P => {
+                            paused = !paused;
+                            continue;
+                        }
+                        Keycode::Left | Keycode::A => Action::Left,
+                        Keycode::Right | Keycode::D => Action::Right,
+                        Keycode::Down | Keycode::S => Action::SoftDrop,
+                        Keycode::Space => Action::HardDrop,
+                        Keycode::Z => Action::RotateCcw,
+                        Keycode::X => Action::RotateCw,
+                        Keycode::C => Action::Swap,
+                        _ => continue,
+                    };
+                    actions.insert(keycode, game.ticks);
+                }
+                Event::KeyUp {
+                    keycode: Some(keycode),
+                    ..
+                } => {
+                    let keycode = match keycode {
+                        Keycode::Left | Keycode::A => Action::Left,
+                        Keycode::Right | Keycode::D => Action::Right,
+                        Keycode::Down | Keycode::S => Action::SoftDrop,
+                        Keycode::Space => Action::HardDrop,
+                        Keycode::Z => Action::RotateCcw,
+                        Keycode::X => Action::RotateCw,
+                        Keycode::C => Action::Swap,
+                        _ => continue,
+                    };
+                    actions.remove(&keycode);
+                }
+                _ => {}
+            }
+        }
+
+        ctx.draw_board(&game.board, &game.current_tetromino)?;
+
+        if paused {
+            ctx.draw_important_text(
+                "resources/josenfin_sans_regular.ttf",
+                "game paused o_o... press [p] to unpause !!",
+            )?;
+        } else if game.game_over {
+            ctx.draw_important_text(
+                "resources/josenfin_sans_regular.ttf",
+                "game over T_T... press [enter] 2 restart :D",
+            )?;
+        } else {
+            let effects = game.step(&actions);
+            effects.into_iter().for_each(|effect| {
+                audio_thread
+                    .send(audio::Command::PlayEffect(effect))
+                    .unwrap()
+            });
+        }
+
+        ctx.present();
+        ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
+    }
+}

src/gui/ui.rs

@@ -0,0 +1,156 @@
+use crate::{board::Board, game::CurrentTetromino, tetromino::Tetromino};
+
+pub trait UiCtx<Err> {
+    fn window_size(&self) -> Result<(i32, i32), Err>;
+    fn fill_rect(&mut self, x: i32, y: i32, width: i32, height: i32, rgb: &Rgb) -> Result<(), Err>;
+    fn outline_rect(
+        &mut self,
+        x: i32,
+        y: i32,
+        width: i32,
+        height: i32,
+        rgb: &Rgb,
+    ) -> Result<(), Err>;
+    fn text_size<P: AsRef<std::path::Path>, Text: AsRef<str>>(
+        &mut self,
+        font: P,
+        text: Text,
+    ) -> Result<(i32, i32), Err>;
+    fn fill_text<P: AsRef<std::path::Path>, Text: AsRef<str>>(
+        &mut self,
+        font: P,
+        text: Text,
+        x: i32,
+        y: i32,
+        width: i32,
+        height: i32,
+    ) -> Result<(), Err>;
+    fn clear(&mut self, rgb: &Rgb) -> Result<(), Err>;
+}
+
+pub trait GameUiCtx<Err>: UiCtx<Err> {
+    fn draw_tetromino_from_parts(
+        &mut self,
+        x: i8,
+        y: i8,
+        color: Rgb,
+        pattern: [[bool; 4]; 4],
+        filled: bool,
+    ) -> Result<(), Err> {
+        for (y_offset, row) in pattern.iter().enumerate() {
+            for x_offset in row
+                .iter()
+                .enumerate()
+                .filter(|(_, exists)| **exists)
+                .map(|(x, _)| x)
+            {
+                let x = x_offset as i8 + x;
+                let y = y_offset as i8 + y;
+
+                if y < 0 {
+                    continue;
+                }
+
+                self.draw_board_tile(x as i32, y as i32, &color, filled)?
+            }
+        }
+        Ok(())
+    }
+
+    fn draw_board_tile(&mut self, x: i32, y: i32, color: &Rgb, filled: bool) -> Result<(), Err> {
+        let tile_size = 24;
+        let (win_width, win_height) = self.window_size()?;
+        let x = center(tile_size * Board::WIDTH as i32, win_width) + x * tile_size;
+        let y = center(tile_size * Board::HEIGHT as i32, win_height) + y * tile_size;
+        if filled {
+            self.fill_rect(x, y, 24, 24, color)?;
+        } else {
+            self.outline_rect(x, y, 24, 24, color)?;
+        }
+        Ok(())
+    }
+
+    fn draw_board(&mut self, board: &Board, current: &CurrentTetromino) -> Result<(), Err> {
+        let (win_width, win_height) = self.window_size()?;
+        self.outline_rect(
+            center(24 * Board::WIDTH as i32, win_width) - 1,
+            center(24 * Board::HEIGHT as i32, win_height) - 1,
+            24 * Board::WIDTH as i32 + 2,
+            24 * Board::HEIGHT as i32 + 2,
+            &Rgb(255, 255, 255),
+        )?;
+
+        for (y, row) in board.iter().enumerate() {
+            for (x, piece) in row.iter().enumerate() {
+                let color = match piece {
+                    Some(t) => Rgb::from_tetromino(t),
+                    None => Rgb(0, 0, 0),
+                };
+                self.draw_board_tile(x as i32, y as i32, &color, true)?
+            }
+        }
+
+        let pattern = current.tetromino.direction_pattern(&current.direction);
+
+        self.draw_tetromino_from_parts(
+            current.x,
+            board.lowest_y(&current),
+            Rgb(255, 255, 255),
+            pattern,
+            false,
+        )?;
+
+        self.draw_tetromino_from_parts(
+            current.x,
+            current.y,
+            Rgb::from_tetromino(&current.tetromino),
+            pattern,
+            true,
+        )?;
+
+        Ok(())
+    }
+
+    fn draw_important_text<P: AsRef<std::path::Path>, Text: AsRef<str>>(
+        &mut self,
+        font: P,
+        text: Text,
+    ) -> Result<(), Err> {
+        let (win_width, win_height) = self.window_size()?;
+        let size = self.text_size(font.as_ref(), text.as_ref())?;
+        let width = size.0;
+        let height = size.1;
+
+        let x = center(width, win_width);
+        let y = center(height, win_height);
+
+        self.outline_rect(x - 9, y - 9, width + 18, height + 18, &Rgb(255, 255, 255))?;
+
+        self.fill_rect(x - 8, y - 8, width + 16, height + 16, &Rgb(16, 16, 16))?;
+        self.fill_text(font, text, x, y, width, height)?;
+
+        Ok(())
+    }
+}
+
+impl<T, Err> GameUiCtx<Err> for T where T: UiCtx<Err> {}
+
+pub struct Rgb(pub u8, pub u8, pub u8);
+
+impl Rgb {
+    pub fn from_tetromino(tetromino: &Tetromino) -> Self {
+        match tetromino {
+            Tetromino::I => Self(0, 255, 255),
+            Tetromino::J => Self(0, 0, 255),
+            Tetromino::L => Self(255, 128, 0),
+            Tetromino::O => Self(255, 255, 0),
+            Tetromino::S => Self(0, 255, 0),
+            Tetromino::T => Self(255, 0, 255),
+            Tetromino::Z => Self(255, 0, 0),
+        }
+    }
+}
+
+fn center(length: i32, max: i32) -> i32 {
+    (max - length) / 2
+}

src/main.rs

@@ -1,288 +1,11 @@
-use actions::{Controls, ControlsHeld};
-use board::Board;
-use tetromino::{Direction, DirectionDiff, Tetromino};
+use tetromino::Tetromino;
 
 mod actions;
 mod board;
+mod game;
+mod gui;
 mod tetromino;
 
-struct Rgb(u8, u8, u8);
-
-struct CurrentTetromino {
-    tetromino: Tetromino,
-    direction: Direction,
-    x: i8,
-    y: i8,
-}
-
-impl CurrentTetromino {
-    fn new(tetromino: Tetromino) -> Self {
-        const PIECE_WIDTH: i8 = 2;
-        Self {
-            tetromino,
-            direction: Direction::Up,
-            x: (Board::WIDTH as i8 - PIECE_WIDTH) / 2,
-            y: -1,
-        }
-    }
-}
-
-struct Game {
-    board: Board,
-    next_tetrominos: [Tetromino; 3],
-    current_tetromino: CurrentTetromino,
-    held_tetromino: Option<Tetromino>,
-    has_swapped_held: bool,
-    score: Score,
-    ticks: usize,
-}
-
-struct Score {
-    level: usize,
-    points: usize,
-    lines: usize,
-    combo: usize,
-    back_to_back: bool,
-}
-
-impl Score {
-    const fn new() -> Self {
-        Self {
-            level: 0,
-            points: 0,
-            lines: 0,
-            combo: 0,
-            back_to_back: false,
-        }
-    }
-
-    fn level_up(&mut self, lines_cleared: usize) {
-        self.lines += lines_cleared;
-        if self.lines > self.level * 5 {
-            self.level += 1;
-            self.lines = 0;
-        }
-    }
-
-    fn point_multiplier_from_lines_cleared(lines_cleared: usize) -> f32 {
-        match lines_cleared {
-            0 => 0.0,
-            1 => 100.0,
-            2 => 300.0,
-            3 => 500.0,
-            4 => 800.0,
-            _ => unreachable!("we cannot clear more than 4 lines"),
-        }
-    }
-
-    fn combos(&self, lines_cleared: usize) -> usize {
-        if lines_cleared > 0 {
-            self.combo * 50 * self.level
-        } else {
-            0
-        }
-    }
-}
-
-impl Game {
-    fn take_next_in_bag(&mut self, mut last: Tetromino) -> Tetromino {
-        for value in self.next_tetrominos.iter_mut().rev() {
-            std::mem::swap(value, &mut last)
-        }
-        last
-    }
-
-    fn hard_drop(&mut self, controls: &ControlsHeld) {
-        if !controls.just_pressed(self.ticks, &Controls::HardDrop) {
-            return;
-        }
-        let start_y = self.current_tetromino.y;
-        loop {
-            self.current_tetromino.y += 1;
-            if !self.board.colliding(&self.current_tetromino) {
-                continue;
-            }
-            self.current_tetromino.y -= 1;
-            self.score.points += (self.current_tetromino.y - start_y) as usize * 2;
-            self.place_current_tetromino();
-            self.check_line_clears();
-            break;
-        }
-    }
-
-    fn soft_drop(&mut self, controls: &ControlsHeld) {
-        let mut delay = 32 - self.score.level * 2;
-        if controls.contains_key(&Controls::SoftDrop) {
-            delay /= 10;
-        }
-
-        if self.ticks % delay != 0 {
-            return;
-        }
-
-        self.current_tetromino.y += 1;
-        if self.board.colliding(&self.current_tetromino) {
-            self.current_tetromino.y -= 1;
-            self.place_current_tetromino();
-            self.check_line_clears();
-        } else if controls.contains_key(&Controls::SoftDrop) {
-            self.score.points += 1;
-        }
-    }
-
-    fn move_horizontally(&mut self, controls: &ControlsHeld) {
-        for key in [Controls::Left, Controls::Right] {
-            let just_pressed = controls.just_pressed(self.ticks, &key);
-            let long_press = controls.held_for(self.ticks, &key, |held_for| held_for > 15);
-            if !just_pressed && !long_press {
-                continue;
-            }
-            let offset = match key {
-                Controls::Left => -1,
-                Controls::Right => 1,
-                _ => unreachable!(),
-            };
-            self.current_tetromino.x += offset;
-            if self.board.colliding(&self.current_tetromino) {
-                self.current_tetromino.x -= offset;
-            }
-        }
-    }
-
-    fn check_line_clears(&mut self) {
-        let lines_cleared = self.board.lines_cleared();
-
-        self.score.level_up(lines_cleared);
-
-        let mut points =
-            self.score.level as f32 * Score::point_multiplier_from_lines_cleared(lines_cleared);
-
-        if self.score.back_to_back && lines_cleared == 4 {
-            points *= 1.5;
-        }
-        points += self.score.combos(lines_cleared) as f32;
-
-        self.score.points += points as usize;
-
-        if lines_cleared == 4 {
-            self.score.back_to_back = true;
-        } else if lines_cleared > 0 {
-            self.score.back_to_back = false;
-        }
-
-        if lines_cleared > 0 {
-            self.score.combo += 1;
-            // play_line_clears_sound();
-        } else {
-            self.score.combo = 0;
-            // play_hard_drop_sound();
-        }
-    }
-
-    fn step(&mut self, controls: &ControlsHeld) {
-        // TODO: ensure game is running at 60 ticks per second? (`if !check_update_time(context, 60) { return; }`)
-        self.hard_drop(controls);
-        self.soft_drop(controls);
-        self.move_horizontally(controls);
-
-        if controls.just_pressed(self.ticks, &Controls::Swap) {
-            self.try_swap_tetromino();
-        }
-
-        for (control, direction) in [
-            (Controls::RotateCw, DirectionDiff::Cw),
-            (Controls::RotateCcw, DirectionDiff::Ccw),
-        ] {
-            if !controls.just_pressed(self.ticks, &control) {
-                continue;
-            }
-            self.try_rotate(direction);
-        }
-        self.ticks += 1;
-    }
-
-    fn try_rotate(&mut self, diff: DirectionDiff) -> bool {
-        let rotated = self.current_tetromino.direction.rotate(&diff);
-        let old_direction = std::mem::replace(&mut self.current_tetromino.direction, rotated);
-        if !self.board.colliding(&self.current_tetromino) {
-            return true;
-        }
-        let wall_kicks = self
-            .current_tetromino
-            .tetromino
-            .wall_kicks(&old_direction, &diff);
-
-        for (x, y) in wall_kicks {
-            self.current_tetromino.x += x;
-            self.current_tetromino.y += y;
-            if !(self.board.colliding(&self.current_tetromino)) {
-                return true;
-            }
-            self.current_tetromino.x -= x;
-            self.current_tetromino.y -= y;
-        }
-
-        self.current_tetromino.direction = old_direction;
-        false
-    }
-
-    fn place_current_tetromino(&mut self) {
-        let next = CurrentTetromino::new(self.take_next_in_bag(Tetromino::random()));
-        let current = std::mem::replace(&mut self.current_tetromino, next);
-        let pattern = current.tetromino.direction_pattern(&current.direction);
-
-        for (y, row) in pattern.iter().enumerate() {
-            for x in row
-                .iter()
-                .enumerate()
-                .filter(|(_, exists)| **exists)
-                .map(|(x, _)| x)
-            {
-                let y = (current.y + y as i8) as usize;
-                let x = (current.x + x as i8) as usize;
-                self.board[y][x] = Some(current.tetromino.clone());
-            }
-        }
-
-        self.has_swapped_held = false;
-    }
-
-    fn try_swap_tetromino(&mut self) {
-        if self.has_swapped_held {
-            return;
-        }
-        self.has_swapped_held = true;
-        let held_or_first_in_bag_tetromino = self
-            .held_tetromino
-            .take()
-            .unwrap_or_else(|| self.take_next_in_bag(Tetromino::random()));
-        let current_tetromino = CurrentTetromino::new(held_or_first_in_bag_tetromino);
-        let old_tetromino = std::mem::replace(&mut self.current_tetromino, current_tetromino);
-        self.held_tetromino.replace(old_tetromino.tetromino);
-    }
-}
-
-fn main() {}
-
-#[cfg(test)]
-mod test {
-    use crate::{Board, CurrentTetromino, Game, Score, Tetromino};
-
-    #[test]
-    fn advance_bag() {
-        let mut game = Game {
-            board: Board::new(),
-            score: Score::new(),
-            next_tetrominos: [Tetromino::I, Tetromino::J, Tetromino::O],
-            current_tetromino: CurrentTetromino::new(Tetromino::J),
-            held_tetromino: None,
-            has_swapped_held: false,
-            ticks: 0,
-        };
-        assert_eq!(game.take_next_in_bag(Tetromino::S), Tetromino::I);
-        assert_eq!(
-            game.next_tetrominos,
-            [Tetromino::J, Tetromino::O, Tetromino::S]
-        );
-    }
+fn main() {
+    gui::start_game().unwrap();
 }

src/tetromino.rs

@@ -1,5 +1,3 @@
-use crate::Rgb;
-
 #[derive(Clone, Debug, PartialEq)]
 pub enum Tetromino {
     I,
@@ -53,65 +51,173 @@ impl Tetromino {
         }
     }
 
-    const fn color(&self) -> Rgb {
-        match self {
-            Self::I => Rgb(0, 255, 255),
-            Self::J => Rgb(0, 0, 255),
-            Self::L => Rgb(255, 128, 0),
-            Self::O => Rgb(255, 255, 0),
-            Self::S => Rgb(0, 255, 0),
-            Self::T => Rgb(255, 0, 255),
-            Self::Z => Rgb(255, 0, 0),
-        }
-    }
-
     pub fn direction_pattern(&self, direction: &Direction) -> [[bool; 4]; 4] {
         let dir = match self {
             Self::I => match direction {
-                Direction::Up => [[0, 0, 0, 0], [1, 1, 1, 1], [0, 0, 0, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 1, 0], [0, 0, 1, 0], [0, 0, 1, 0], [0, 0, 1, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 1, 1], [0, 0, 0, 0]],
-                Direction::Left => [[0, 1, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '#', '#'],
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '#', '-'],
+                    ['-', '-', '#', '-'],
+                    ['-', '-', '#', '-'],
+                    ['-', '-', '#', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '#', '#'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                ],
             },
             Self::J => match direction {
-                Direction::Up => [[0, 0, 0, 0], [1, 0, 0, 0], [1, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 1, 1, 0], [0, 1, 0, 0], [0, 1, 0, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 1, 0], [0, 0, 1, 0]],
-                Direction::Left => [[0, 0, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0], [1, 1, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['#', '-', '-', '-'],
+                    ['#', '#', '#', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '#', '-'],
+                    ['-', '-', '#', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['#', '#', '-', '-'],
+                ],
             },
             Self::L => match direction {
-                Direction::Up => [[0, 0, 0, 0], [0, 0, 1, 0], [1, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0], [0, 1, 1, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 1, 0], [1, 0, 0, 0]],
-                Direction::Left => [[0, 0, 0, 0], [1, 1, 0, 0], [0, 1, 0, 0], [0, 1, 0, 0]],
-            },
-            Self::O => match direction {
-                Direction::Up => [[0, 0, 0, 0], [0, 1, 1, 0], [0, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 1, 1, 0], [0, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 1, 1, 0], [0, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Left => [[0, 0, 0, 0], [0, 1, 1, 0], [0, 1, 1, 0], [0, 0, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '#', '-'],
+                    ['#', '#', '#', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '#', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '#', '-'],
+                    ['#', '-', '-', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                ],
             },
             Self::S => match direction {
-                Direction::Up => [[0, 0, 0, 0], [0, 1, 1, 0], [1, 1, 0, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 1, 0, 0], [0, 1, 1, 0], [0, 0, 1, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [0, 1, 1, 0], [1, 1, 0, 0]],
-                Direction::Left => [[0, 0, 0, 0], [1, 0, 0, 0], [1, 1, 0, 0], [0, 1, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['-', '-', '#', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['#', '#', '-', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '-', '-', '-'],
+                    ['#', '-', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                ],
             },
             Self::T => match direction {
-                Direction::Up => [[0, 0, 0, 0], [0, 1, 0, 0], [1, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 1, 0, 0], [0, 1, 1, 0], [0, 1, 0, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 1, 0], [0, 1, 0, 0]],
-                Direction::Left => [[0, 0, 0, 0], [0, 1, 0, 0], [1, 1, 0, 0], [0, 1, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['#', '#', '#', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['-', '#', '-', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '#', '-'],
+                    ['-', '#', '-', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '#', '-', '-'],
+                ],
             },
             Self::Z => match direction {
-                Direction::Up => [[0, 0, 0, 0], [1, 1, 0, 0], [0, 1, 1, 0], [0, 0, 0, 0]],
-                Direction::Right => [[0, 0, 0, 0], [0, 0, 1, 0], [0, 1, 1, 0], [0, 1, 0, 0]],
-                Direction::Down => [[0, 0, 0, 0], [0, 0, 0, 0], [1, 1, 0, 0], [0, 1, 1, 0]],
-                Direction::Left => [[0, 0, 0, 0], [0, 1, 0, 0], [1, 1, 0, 0], [1, 0, 0, 0]],
+                Direction::Up => [
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '#', '#', '-'],
+                    ['-', '-', '-', '-'],
+                ],
+                Direction::Right => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '#', '-'],
+                    ['-', '#', '#', '-'],
+                    ['-', '#', '-', '-'],
+                ],
+                Direction::Down => [
+                    ['-', '-', '-', '-'],
+                    ['-', '-', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['-', '#', '#', '-'],
+                ],
+                Direction::Left => [
+                    ['-', '-', '-', '-'],
+                    ['-', '#', '-', '-'],
+                    ['#', '#', '-', '-'],
+                    ['#', '-', '-', '-'],
+                ],
             },
+            Self::O => [
+                ['-', '-', '-', '-'],
+                ['-', '#', '#', '-'],
+                ['-', '#', '#', '-'],
+                ['-', '-', '-', '-'],
+            ],
         };
 
-        dir.map(|row| row.map(|v| v != 0))
+        dir.map(|row| row.map(|v| v != '-'))
     }
 
     pub const fn wall_kicks(&self, direction: &Direction, diff: &DirectionDiff) -> [(i8, i8); 5] {