src/core/app.rs

   1 use boll::*;
   2 use core::controller::ControllerManager;
   3 use core::render::Renderer;
   4 use geometry::{Point, Dimension};
   5 use point; // defined in common, but loaded from main...
   6 use rand::Rng;
   7 use sdl2::event::{Event, WindowEvent};
   8 use sdl2::keyboard::Keycode;
   9 use sdl2::rect::Rect as SDLRect;
  10 use sdl2::video::SwapInterval;
  11 use sdl2::{EventPump, VideoSubsystem};
  12 use sprites::SpriteManager;
  13 use std::f32::consts::PI;
  14 use time::{Duration, Instant, prelude::*};
  15
  16 const FPS: u32 = 60;
  17 const NS_PER_FRAME: u32 = 1_000_000_000 / FPS;
  18
  19 #[derive(Default)]
  20 pub struct AppBuilder {
  21     resolution: Dimension<u16>,
  22     state: Option<Box<dyn AppState>>,
  23     title: Option<String>,
  24 }
  25
  26 impl AppBuilder {
  27     pub fn with_resolution(mut self, width: u16, height: u16) -> Self {
  28         self.resolution = Dimension { width, height };
  29         self
  30     }
  31
  32     pub fn with_state(mut self, state: Box<dyn AppState>) -> Self {
  33         self.state = Some(state);
  34         self
  35     }
  36
  37     pub fn with_title(mut self, title: &str) -> Self {
  38         self.title = Some(title.to_string());
  39         self
  40     }
  41
  42     pub fn build(self) -> Result<App, String> {
  43         let context = sdl2::init().unwrap();
  44         sdl2::image::init(sdl2::image::InitFlag::PNG)?;
  45         let video = context.video()?;
  46         //self.print_video_display_modes(&video);
  47
  48         let window = video
  49             .window(
  50                 &self.title.unwrap(),
  51                 self.resolution.width.into(),
  52                 self.resolution.height.into(),
  53             )
  54             .position_centered()
  55             // .fullscreen()
  56             // .fullscreen_desktop()
  57             .opengl()
  58             .build()
  59             .unwrap();
  60         context.mouse().show_cursor(false);
  61
  62         let canvas = window.into_canvas().build().unwrap();
  63         let sprites = SpriteManager::new(canvas.texture_creator());
  64         let screen = canvas.output_size().unwrap();
  65         let renderer = Renderer::new(canvas);
  66
  67         video.gl_set_swap_interval(SwapInterval::VSync)?;
  68
  69         let event_pump = context.event_pump()?;
  70
  71         Ok(App {
  72             renderer,
  73             event_pump,
  74             sprites,
  75             states: vec!(self.state.unwrap_or_else(|| Box::new(ActiveState::new(screen)))),
  76             ctrl_man: ControllerManager::new(context.joystick()?, context.haptic()?),
  77         })
  78     }
  79
  80     #[allow(dead_code)]
  81     fn print_video_display_modes(&self, video: &VideoSubsystem) {
  82         println!("video subsystem: {:?}", video);
  83         println!("current_video_driver: {:?}", video.current_video_driver());
  84         for display in 0..video.num_video_displays().unwrap() {
  85             println!(
  86                 "=== display {} - {} ===",
  87                 display,
  88                 video.display_name(display).unwrap()
  89             );
  90             println!(
  91                 " display_bounds: {:?}",
  92                 video.display_bounds(display).unwrap()
  93             );
  94             println!(
  95                 " num_display_modes: {:?}",
  96                 video.num_display_modes(display).unwrap()
  97             );
  98             println!(
  99                 " desktop_display_mode: {:?}",
 100                 video.desktop_display_mode(display).unwrap()
 101             );
 102             let current = video.current_display_mode(display).unwrap();
 103             println!(
 104                 " current_display_mode: {:?}",
 105                 current
 106             );
 107             for idx in 0..video.num_display_modes(display).unwrap() {
 108                 let mode = video.display_mode(display, idx).unwrap();
 109                 println!(
 110                     " {}{:2}: {:?}",
 111                     if mode == current { "*" } else { " " },
 112                     idx,
 113                     mode
 114                 );
 115             }
 116         }
 117         println!("swap interval: {:?}", video.gl_get_swap_interval());
 118     }
 119 }
 120
 121 pub struct App {
 122     renderer: Renderer,
 123     event_pump: EventPump,
 124     sprites: SpriteManager,
 125     states: Vec<Box<dyn AppState>>,
 126     pub ctrl_man: ControllerManager,
 127 }
 128
 129 impl App {
 130     #[allow(clippy::new_ret_no_self)]
 131     pub fn new() -> AppBuilder {
 132         Default::default()
 133     }
 134
 135     pub fn load_sprites(&mut self, sprites: &[(&str, &str)]) {
 136         for (name, file) in sprites {
 137             self.sprites.load(name, file);
 138         }
 139     }
 140
 141     pub fn start(&mut self) {
 142         let mut last_time = Instant::now();
 143
 144         self.states[0].enter(&self.ctrl_man);
 145
 146         loop {
 147             if let Some(change) = self.handle_events() {
 148                 self.handle_state_change(change);
 149             }
 150
 151             let duration = Instant::now() - last_time;
 152             last_time = Instant::now();
 153
 154             self.ctrl_man.update(duration);
 155
 156             if let Some(state) = self.states.last_mut() {
 157                 if let Some(change) = state.update(duration) {
 158                     self.handle_state_change(change);
 159                 }
 160             } else {
 161                 break;
 162             }
 163
 164             self.render();
 165         }
 166     }
 167
 168     fn handle_state_change(&mut self, change: StateChange) {
 169         match change {
 170             StateChange::Push(mut state) => {
 171                 // if let Some(s) = self.states.last_mut() {
 172                 //     s.pause();
 173                 // }
 174                 state.enter(&self.ctrl_man);
 175                 self.states.push(state);
 176             }
 177             StateChange::Pop => {
 178                 if let Some(mut s) = self.states.pop() {
 179                     s.leave();
 180                 }
 181             }
 182             StateChange::Exit => {
 183                 while let Some(mut s) = self.states.pop() {
 184                     s.leave();
 185                 }
 186             }
 187         }
 188     }
 189
 190     fn handle_events(&mut self) -> Option<StateChange> {
 191         for event in self.event_pump.poll_iter() {
 192             self.ctrl_man.handle_event(&event);
 193             match event {
 194                 Event::Quit { .. }
 195                 | Event::KeyDown {
 196                     keycode: Some(Keycode::Escape),
 197                     ..
 198                 } => {
 199                     return Some(StateChange::Pop)
 200                 }
 201                 Event::KeyDown {
 202                     keycode: Some(Keycode::F11),
 203                     ..
 204                 } => {
 205                     self.renderer.toggle_fullscreen();
 206                 }
 207                 Event::Window {
 208                     win_event: WindowEvent::Resized(x, y),
 209                     ..
 210                 } => {
 211                     println!("window resized({}, {})", x, y)
 212                 }
 213                 Event::Window {
 214                     win_event: WindowEvent::Maximized,
 215                     ..
 216                 } => {
 217                     println!("window maximized")
 218                 }
 219                 Event::Window {
 220                     win_event: WindowEvent::Restored,
 221                     ..
 222                 } => {
 223                     println!("window restored")
 224                 }
 225                 Event::Window {
 226                     win_event: WindowEvent::Enter,
 227                     ..
 228                 } => {
 229                     println!("window enter")
 230                 }
 231                 Event::Window {
 232                     win_event: WindowEvent::Leave,
 233                     ..
 234                 } => {
 235                     println!("window leave")
 236                 }
 237                 Event::Window {
 238                     win_event: WindowEvent::FocusGained,
 239                     ..
 240                 } => {
 241                     println!("window focus gained")
 242                 }
 243                 Event::Window {
 244                     win_event: WindowEvent::FocusLost,
 245                     ..
 246                 } => {
 247                     println!("window focus lost")
 248                 }
 249                 _ => {
 250                     if let Some(state) = self.states.last_mut() {
 251                         if let Some(change) = state.handle_event(event) {
 252                             return Some(change);
 253                         }
 254                     } else {
 255                         return Some(StateChange::Exit)
 256                     }
 257                 },
 258             }
 259         }
 260         None
 261     }
 262
 263     fn render(&mut self) {
 264         self.renderer.clear();
 265         self.states.last_mut().unwrap().render(&mut self.renderer, &self.sprites);
 266         self.renderer.present();
 267     }
 268 }
 269
 270 pub enum StateChange {
 271     Push(Box<dyn AppState>),
 272     Pop,
 273     Exit,
 274 }
 275
 276 pub trait AppState {
 277     fn enter(&mut self, ctrl_man: &ControllerManager);
 278     fn leave(&mut self);
 279     fn update(&mut self, dt: Duration) -> Option<StateChange>;
 280     fn render(&mut self, renderer: &mut Renderer, sprites: &SpriteManager);
 281     fn handle_event(&mut self, event: Event) -> Option<StateChange>;
 282 }
 283
 284 type Bollar = Vec<Box<dyn Boll>>;
 285
 286 #[derive(Default)]
 287 pub struct ActiveState {
 288     screen: Dimension<u32>,
 289     bolls: Bollar,
 290     boll_size: u32,
 291     mario_angle: f64,
 292 }
 293
 294 impl ActiveState {
 295     pub fn new(screen: (u32, u32)) -> ActiveState {
 296         ActiveState {
 297             bolls: Bollar::new(),
 298             boll_size: 1,
 299             screen: Dimension::from(screen),
 300             ..Default::default()
 301         }
 302     }
 303
 304     fn change_boll_count(&mut self, delta: i32) {
 305         #[allow(clippy::comparison_chain)]
 306         if delta > 0 {
 307             for _i in 0..delta {
 308                 self.add_boll();
 309             }
 310         } else if delta < 0 {
 311             for _i in 0..(-delta) {
 312                 self.bolls.pop();
 313             }
 314         }
 315     }
 316
 317     fn add_boll(&mut self) {
 318         let mut rng = rand::thread_rng();
 319         self.bolls.push(Box::new(SquareBoll {
 320             pos: point!(
 321                 rng.gen_range(0, self.screen.width) as f64,
 322                 rng.gen_range(0, self.screen.height) as f64
 323             ),
 324             vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
 325         }));
 326     }
 327 }
 328
 329 impl AppState for ActiveState {
 330     fn enter(&mut self, _ctrl_man: &ControllerManager) {}
 331
 332     fn update(&mut self, dt: Duration) -> Option<StateChange> {
 333         for b in &mut self.bolls {
 334             b.update();
 335         }
 336
 337         match dt {
 338             ns if ns < (NS_PER_FRAME - 90_0000).nanoseconds() => self.change_boll_count(100),
 339             ns if ns > (NS_PER_FRAME + 90_0000).nanoseconds() => self.change_boll_count(-100),
 340             _ => {}
 341         }
 342
 343         None
 344     }
 345
 346     fn render(&mut self, renderer: &mut Renderer, sprites: &SpriteManager) {
 347         /* draw square of blocks */ {
 348             let blocks = 20;
 349             let size = 32;
 350             let offset = point!(
 351                 (self.screen.width as i32 - (blocks + 1) * size) / 2,
 352                 (self.screen.height as i32 - (blocks + 1) * size) / 2
 353             );
 354             let block = sprites.get("block");
 355             for i in 0..blocks {
 356                 renderer
 357                     .blit(
 358                         block,
 359                         None,
 360                         SDLRect::new((i) * size + offset.x, offset.y, size as u32, size as u32),
 361                     );
 362                 renderer
 363                     .blit(
 364                         block,
 365                         None,
 366                         SDLRect::new(
 367                             (blocks - i) * size + offset.x,
 368                             (blocks) * size + offset.y,
 369                             size as u32,
 370                             size as u32,
 371                         ),
 372                     );
 373                 renderer
 374                     .blit(
 375                         block,
 376                         None,
 377                         SDLRect::new(
 378                             offset.x,
 379                             (blocks - i) * size + offset.y,
 380                             size as u32,
 381                             size as u32,
 382                         ),
 383                     );
 384                 renderer
 385                     .blit(
 386                         block,
 387                         None,
 388                         SDLRect::new(
 389                             (blocks) * size + offset.x,
 390                             (i) * size + offset.y,
 391                             size as u32,
 392                             size as u32,
 393                         ),
 394                     );
 395             }
 396         }
 397
 398         /* draw mario */ {
 399             let size = 64;
 400             let offset = point!(
 401                 (self.screen.width as i32 - size) / 2,
 402                 (self.screen.height as i32 - size) / 2
 403             );
 404             let radius = 110.0 + size as f32 * 0.5;
 405             let angle = (self.mario_angle as f32 - 90.0) * PI / 180.0;
 406             let offset2 = point!((angle.cos() * radius) as i32, (angle.sin() * radius) as i32);
 407             renderer
 408                 .blit_ex(
 409                     sprites.get("mario"),
 410                     None,
 411                     SDLRect::new(
 412                         offset.x + offset2.x,
 413                         offset.y + offset2.y,
 414                         size as u32,
 415                         size as u32,
 416                     ),
 417                     self.mario_angle,
 418                     sdl2::rect::Point::new(size / 2, size / 2),
 419                     false,
 420                     false,
 421                 );
 422             self.mario_angle = (self.mario_angle + 1.0) % 360.0;
 423         }
 424
 425         /* draw circles and ellipses*/ {
 426             let p = point!((self.screen.width / 2) as i16, (self.screen.height / 2) as i16);
 427             renderer.circle(p, 100, (255, 255, 255));
 428             renderer.circle(p, 110, (255, 255, 255));
 429             renderer.ellipse(p, (50, 100), (255, 255, 255));
 430             renderer.ellipse(p, (110, 55), (255, 255, 255));
 431         }
 432
 433         for b in &self.bolls {
 434             b.draw(renderer, self.boll_size);
 435         }
 436     }
 437
 438     fn leave(&mut self) {
 439         println!("number of bolls: {}", self.bolls.len());
 440     }
 441
 442     fn handle_event(&mut self, event: Event) -> Option<StateChange> {
 443         match event {
 444             Event::KeyDown {
 445                 keycode: Some(Keycode::KpPlus),
 446                 ..
 447             } => self.boll_size = std::cmp::min(self.boll_size + 1, 32),
 448             Event::KeyDown {
 449                 keycode: Some(Keycode::KpMinus),
 450                 ..
 451             } => self.boll_size = std::cmp::max(self.boll_size - 1, 1),
 452             Event::MouseMotion { x, y, .. } => self.bolls.push(Box::new(CircleBoll::new(
 453                 point!(x as f64, y as f64),
 454                 point!(0.0, 0.0),
 455             ))),
 456             _ => {}
 457         }
 458         None
 459     }
 460 }