src/core/app.rs

   1 use boll::*;
   2 use common::{Point2D, Rect};
   3 use core::controller::ControllerManager;
   4 use core::render::Renderer;
   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: Rect<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 = Rect { 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             state: 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     state: 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.state.enter(&mut self.ctrl_man);
 145
 146         'running: loop {
 147             if let Err(_) = self.handle_events() {
 148                 break 'running;
 149             }
 150
 151             let duration = Instant::now() - last_time;
 152             last_time = Instant::now();
 153
 154             self.ctrl_man.update(duration);
 155             self.state.update(duration);
 156
 157             self.render();
 158         }
 159
 160         self.state.leave();
 161     }
 162
 163     fn handle_events(&mut self) -> Result<(), ()> {
 164         for event in self.event_pump.poll_iter() {
 165             self.ctrl_man.handle_event(&event);
 166             match event {
 167                 Event::Quit { .. }
 168                 | Event::KeyDown {
 169                     keycode: Some(Keycode::Escape),
 170                     ..
 171                 } => {
 172                     return Err(())
 173                 }
 174                 Event::KeyDown {
 175                     keycode: Some(Keycode::F11),
 176                     ..
 177                 } => {
 178                     self.renderer.toggle_fullscreen();
 179                 }
 180                 Event::Window {
 181                     win_event: WindowEvent::Resized(x, y),
 182                     ..
 183                 } => {
 184                     println!("window resized({}, {})", x, y)
 185                 }
 186                 Event::Window {
 187                     win_event: WindowEvent::Maximized,
 188                     ..
 189                 } => {
 190                     println!("window maximized")
 191                 }
 192                 Event::Window {
 193                     win_event: WindowEvent::Restored,
 194                     ..
 195                 } => {
 196                     println!("window restored")
 197                 }
 198                 Event::Window {
 199                     win_event: WindowEvent::Enter,
 200                     ..
 201                 } => {
 202                     println!("window enter")
 203                 }
 204                 Event::Window {
 205                     win_event: WindowEvent::Leave,
 206                     ..
 207                 } => {
 208                     println!("window leave")
 209                 }
 210                 Event::Window {
 211                     win_event: WindowEvent::FocusGained,
 212                     ..
 213                 } => {
 214                     println!("window focus gained")
 215                 }
 216                 Event::Window {
 217                     win_event: WindowEvent::FocusLost,
 218                     ..
 219                 } => {
 220                     println!("window focus lost")
 221                 }
 222                 _ => self.state.handle_event(event),
 223             }
 224         }
 225         Ok(())
 226     }
 227
 228     fn render(&mut self) {
 229         self.renderer.clear();
 230         self.state.render(&mut self.renderer, &mut self.sprites);
 231         self.renderer.present();
 232     }
 233 }
 234
 235 pub trait AppState {
 236     fn enter(&mut self, ctrl_man: &ControllerManager);
 237     fn leave(&mut self);
 238     fn update(&mut self, dt: Duration);
 239     fn render(&mut self, renderer: &mut Renderer, sprites: &SpriteManager);
 240     fn handle_event(&mut self, event: Event);
 241 }
 242
 243 type Bollar = Vec<Box<dyn Boll>>;
 244
 245 #[derive(Default)]
 246 pub struct ActiveState {
 247     screen: Rect<u32>,
 248     bolls: Bollar,
 249     boll_size: u32,
 250     mario_angle: f64,
 251 }
 252
 253 impl ActiveState {
 254     pub fn new(screen: (u32, u32)) -> ActiveState {
 255         ActiveState {
 256             bolls: Bollar::new(),
 257             boll_size: 1,
 258             screen: Rect::from(screen),
 259             ..Default::default()
 260         }
 261     }
 262
 263     fn change_boll_count(&mut self, delta: i32) {
 264         #[allow(clippy::comparison_chain)]
 265         if delta > 0 {
 266             for _i in 0..delta {
 267                 self.add_boll();
 268             }
 269         } else if delta < 0 {
 270             for _i in 0..(-delta) {
 271                 self.bolls.pop();
 272             }
 273         }
 274     }
 275
 276     fn add_boll(&mut self) {
 277         let mut rng = rand::thread_rng();
 278         self.bolls.push(Box::new(SquareBoll {
 279             pos: point!(
 280                 rng.gen_range(0, self.screen.width) as f64,
 281                 rng.gen_range(0, self.screen.height) as f64
 282             ),
 283             vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
 284         }));
 285     }
 286 }
 287
 288 impl AppState for ActiveState {
 289     fn enter(&mut self, _ctrl_man: &ControllerManager) {}
 290
 291     fn update(&mut self, dt: Duration) {
 292         for b in &mut self.bolls {
 293             b.update();
 294         }
 295
 296         match dt {
 297             ns if ns < (NS_PER_FRAME - 90_0000).nanoseconds() => self.change_boll_count(100),
 298             ns if ns > (NS_PER_FRAME + 90_0000).nanoseconds() => self.change_boll_count(-100),
 299             _ => {}
 300         }
 301     }
 302
 303     fn render(&mut self, renderer: &mut Renderer, sprites: &SpriteManager) {
 304         /* draw square of blocks */ {
 305             let blocks = 20;
 306             let size = 32;
 307             let offset = point!(
 308                 (self.screen.width as i32 - (blocks + 1) * size) / 2,
 309                 (self.screen.height as i32 - (blocks + 1) * size) / 2
 310             );
 311             let block = sprites.get("block");
 312             for i in 0..blocks {
 313                 renderer
 314                     .blit(
 315                         block,
 316                         None,
 317                         SDLRect::new((i) * size + offset.x, offset.y, size as u32, size as u32),
 318                     );
 319                 renderer
 320                     .blit(
 321                         block,
 322                         None,
 323                         SDLRect::new(
 324                             (blocks - i) * size + offset.x,
 325                             (blocks) * size + offset.y,
 326                             size as u32,
 327                             size as u32,
 328                         ),
 329                     );
 330                 renderer
 331                     .blit(
 332                         block,
 333                         None,
 334                         SDLRect::new(
 335                             offset.x,
 336                             (blocks - i) * size + offset.y,
 337                             size as u32,
 338                             size as u32,
 339                         ),
 340                     );
 341                 renderer
 342                     .blit(
 343                         block,
 344                         None,
 345                         SDLRect::new(
 346                             (blocks) * size + offset.x,
 347                             (i) * size + offset.y,
 348                             size as u32,
 349                             size as u32,
 350                         ),
 351                     );
 352             }
 353         }
 354
 355         /* draw mario */ {
 356             let size = 64;
 357             let offset = point!(
 358                 (self.screen.width as i32 - size) / 2,
 359                 (self.screen.height as i32 - size) / 2
 360             );
 361             let radius = 110.0 + size as f32 * 0.5;
 362             let angle = (self.mario_angle as f32 - 90.0) * PI / 180.0;
 363             let offset2 = point!((angle.cos() * radius) as i32, (angle.sin() * radius) as i32);
 364             renderer
 365                 .blit_ex(
 366                     sprites.get("mario"),
 367                     None,
 368                     SDLRect::new(
 369                         offset.x + offset2.x,
 370                         offset.y + offset2.y,
 371                         size as u32,
 372                         size as u32,
 373                     ),
 374                     self.mario_angle,
 375                     sdl2::rect::Point::new(size / 2, size / 2),
 376                     false,
 377                     false,
 378                 );
 379             self.mario_angle = (self.mario_angle + 1.0) % 360.0;
 380         }
 381
 382         /* draw circles and ellipses*/ {
 383             let p = point!((self.screen.width / 2) as i16, (self.screen.height / 2) as i16);
 384             renderer.circle(p, 100, (255, 255, 255));
 385             renderer.circle(p, 110, (255, 255, 255));
 386             renderer.ellipse(p, (50, 100), (255, 255, 255));
 387             renderer.ellipse(p, (110, 55), (255, 255, 255));
 388         }
 389
 390         for b in &self.bolls {
 391             b.draw(renderer, self.boll_size);
 392         }
 393     }
 394
 395     fn leave(&mut self) {
 396         println!("number of bolls: {}", self.bolls.len());
 397     }
 398
 399     fn handle_event(&mut self, event: Event) {
 400         match event {
 401             Event::KeyDown {
 402                 keycode: Some(Keycode::KpPlus),
 403                 ..
 404             } => self.boll_size = std::cmp::min(self.boll_size + 1, 32),
 405             Event::KeyDown {
 406                 keycode: Some(Keycode::KpMinus),
 407                 ..
 408             } => self.boll_size = std::cmp::max(self.boll_size - 1, 1),
 409             Event::MouseMotion { x, y, .. } => self.bolls.push(Box::new(CircleBoll::new(
 410                 point!(x as f64, y as f64),
 411                 point!(0.0, 0.0),
 412             ))),
 413             _ => {}
 414         }
 415     }
 416 }