src/game/app.rs

   1 use boll::*;
   2 use common::{Point2D, Rect};
   3 use point; // defined in common, but loaded from main...
   4 use rand::Rng;
   5 use sdl2::event::{Event, WindowEvent};
   6 use sdl2::gfx::primitives::DrawRenderer;
   7 use sdl2::keyboard::Keycode;
   8 use sdl2::pixels::Color;
   9 use sdl2::rect::Rect as SDLRect;
  10 use sdl2::render::{BlendMode, Canvas};
  11 use sdl2::video::{FullscreenType, SwapInterval, Window};
  12 use sdl2::{EventPump, VideoSubsystem};
  13 use sprites::SpriteManager;
  14 use std::f32::consts::PI;
  15 use time::PreciseTime;
  16
  17 pub type Nanoseconds = u64;
  18
  19 const FPS: u32 = 60;
  20 const NS_PER_FRAME: u32 = 1_000_000_000 / FPS;
  21
  22 #[derive(Default)]
  23 pub struct AppBuilder {
  24     resolution: Rect<u16>,
  25     state: Option<Box<dyn AppState>>,
  26     title: Option<String>,
  27 }
  28
  29 impl AppBuilder {
  30     pub fn with_resolution(mut self, width: u16, height: u16) -> Self {
  31         self.resolution = Rect { width, height };
  32         self
  33     }
  34
  35     pub fn with_state(mut self, state: Box<dyn AppState>) -> Self {
  36         self.state = Some(state);
  37         self
  38     }
  39
  40     pub fn with_title(mut self, title: &str) -> Self {
  41         self.title = Some(title.to_string());
  42         self
  43     }
  44
  45     pub fn build(self) -> Result<App, String> {
  46         let context = sdl2::init().unwrap();
  47         sdl2::image::init(sdl2::image::InitFlag::PNG)?;
  48         let video = context.video()?;
  49
  50         self.print_video_display_modes(&video);
  51
  52         let window = video
  53             .window(
  54                 &self.title.unwrap(),
  55                 self.resolution.width.into(),
  56                 self.resolution.height.into(),
  57             )
  58             .position_centered()
  59             // .fullscreen()
  60             // .fullscreen_desktop()
  61             .opengl()
  62             .build()
  63             .unwrap();
  64         context.mouse().show_cursor(false);
  65
  66         let mut canvas = window.into_canvas().build().unwrap();
  67         canvas.set_blend_mode(BlendMode::Add);
  68         canvas.set_draw_color(Color::RGB(0, 0, 0));
  69         canvas.clear();
  70         canvas.present();
  71
  72         video.gl_set_swap_interval(SwapInterval::VSync)?;
  73
  74         let event_pump = context.event_pump()?;
  75         let sprites = SpriteManager::new(canvas.texture_creator());
  76         let screen = canvas.output_size().unwrap();
  77
  78         Ok(App {
  79             canvas,
  80             event_pump,
  81             sprites,
  82             state: self.state.unwrap_or_else(|| Box::new(ActiveState::new(screen))),
  83         })
  84     }
  85
  86     fn print_video_display_modes(&self, video: &VideoSubsystem) {
  87         println!("video subsystem: {:?}", video);
  88         println!("current_video_driver: {:?}", video.current_video_driver());
  89         for display in 0..video.num_video_displays().unwrap() {
  90             println!(
  91                 "=== display {} - {} ===",
  92                 display,
  93                 video.display_name(display).unwrap()
  94             );
  95             println!(
  96                 " display_bounds: {:?}",
  97                 video.display_bounds(display).unwrap()
  98             );
  99             println!(
 100                 " num_display_modes: {:?}",
 101                 video.num_display_modes(display).unwrap()
 102             );
 103             println!(
 104                 " desktop_display_mode: {:?}",
 105                 video.desktop_display_mode(display).unwrap()
 106             );
 107             let current = video.current_display_mode(display).unwrap();
 108             println!(
 109                 " current_display_mode: {:?}",
 110                 current
 111             );
 112             for idx in 0..video.num_display_modes(display).unwrap() {
 113                 let mode = video.display_mode(display, idx).unwrap();
 114                 println!(
 115                     " {}{:2}: {:?}",
 116                     if mode == current { "*" } else { " " },
 117                     idx,
 118                     mode
 119                 );
 120             }
 121         }
 122         println!("swap interval: {:?}", video.gl_get_swap_interval());
 123     }
 124 }
 125
 126 pub struct App {
 127     pub canvas: Canvas<Window>,
 128     pub event_pump: EventPump,
 129     pub sprites: SpriteManager,
 130     pub state: Box<dyn AppState>,
 131 }
 132
 133 impl App {
 134     #[allow(clippy::new_ret_no_self)]
 135     pub fn new() -> AppBuilder {
 136         Default::default()
 137     }
 138
 139     pub fn load_sprites(&mut self, sprites: &[(&str, &str)]) {
 140         for (name, file) in sprites {
 141             self.sprites.load(name, file);
 142         }
 143     }
 144
 145     pub fn start(&mut self) {
 146         let mut frame_count: u64 = 0;
 147         let mut fps_time = PreciseTime::now();
 148         let mut last_time = PreciseTime::now();
 149
 150         'running: loop {
 151             if let Err(_) = self.handle_events() {
 152                 break 'running;
 153             }
 154
 155             let duration =
 156                 last_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as Nanoseconds;
 157             last_time = PreciseTime::now();
 158             self.state.update(duration);
 159
 160             self.render();
 161
 162             frame_count += 1;
 163             if frame_count == FPS as u64 {
 164                 let duration = fps_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as f64
 165                     / 1_000_000_000.0;
 166                 println!("fps: {}", frame_count as f64 / duration);
 167                 frame_count = 0;
 168                 fps_time = PreciseTime::now();
 169             }
 170         }
 171
 172         self.state.leave();
 173     }
 174
 175     fn handle_events(&mut self) -> Result<(), ()> {
 176         for event in self.event_pump.poll_iter() {
 177             match event {
 178                 Event::Quit { .. }
 179                 | Event::KeyDown {
 180                     keycode: Some(Keycode::Escape),
 181                     ..
 182                 } => {
 183                     return Err(())
 184                 }
 185                 Event::KeyDown {
 186                     keycode: Some(Keycode::F11),
 187                     ..
 188                 } => {
 189                     match self.canvas.window().fullscreen_state() {
 190                         FullscreenType::Off => self
 191                             .canvas
 192                             .window_mut()
 193                             .set_fullscreen(FullscreenType::Desktop),
 194                         _ => self.canvas.window_mut().set_fullscreen(FullscreenType::Off),
 195                     }
 196                     .unwrap();
 197                 }
 198                 Event::Window {
 199                     win_event: WindowEvent::Resized(x, y),
 200                     ..
 201                 } => {
 202                     println!("window resized({}, {})", x, y)
 203                 }
 204                 Event::Window {
 205                     win_event: WindowEvent::Maximized,
 206                     ..
 207                 } => {
 208                     println!("window maximized")
 209                 }
 210                 Event::Window {
 211                     win_event: WindowEvent::Restored,
 212                     ..
 213                 } => {
 214                     println!("window restored")
 215                 }
 216                 Event::Window {
 217                     win_event: WindowEvent::Enter,
 218                     ..
 219                 } => {
 220                     println!("window enter")
 221                 }
 222                 Event::Window {
 223                     win_event: WindowEvent::Leave,
 224                     ..
 225                 } => {
 226                     println!("window leave")
 227                 }
 228                 Event::Window {
 229                     win_event: WindowEvent::FocusGained,
 230                     ..
 231                 } => {
 232                     println!("window focus gained")
 233                 }
 234                 Event::Window {
 235                     win_event: WindowEvent::FocusLost,
 236                     ..
 237                 } => {
 238                     println!("window focus lost")
 239                 }
 240                 _ => self.state.on_event(event),
 241             }
 242         }
 243         Ok(())
 244     }
 245
 246     fn render(&mut self) {
 247         self.canvas.set_draw_color(Color::RGB(0, 0, 0));
 248         self.canvas.clear();
 249         self.state.render(&mut self.canvas, &mut self.sprites);
 250         self.canvas.present();
 251     }
 252 }
 253
 254 pub trait AppState {
 255     fn update(&mut self, dt: Nanoseconds);
 256     fn render(&mut self, canvas: &mut Canvas<Window>, sprites: &mut SpriteManager);
 257     fn leave(&self);
 258     fn on_event(&mut self, event: Event);
 259 }
 260
 261 type Bollar = Vec<Box<dyn Boll>>;
 262
 263 #[derive(Default)]
 264 pub struct ActiveState {
 265     screen: Rect<u32>,
 266     bolls: Bollar,
 267     boll_size: u32,
 268     mario_angle: f64,
 269 }
 270
 271 impl ActiveState {
 272     pub fn new(screen: (u32, u32)) -> ActiveState {
 273         ActiveState {
 274             bolls: Bollar::new(),
 275             boll_size: 1,
 276             screen: Rect::from(screen),
 277             ..Default::default()
 278         }
 279     }
 280
 281     fn change_boll_count(&mut self, delta: i32) {
 282         #[allow(clippy::comparison_chain)]
 283         if delta > 0 {
 284             for _i in 0..delta {
 285                 self.add_boll();
 286             }
 287         } else if delta < 0 {
 288             for _i in 0..(-delta) {
 289                 self.bolls.pop();
 290             }
 291         }
 292     }
 293
 294     fn add_boll(&mut self) {
 295         let mut rng = rand::thread_rng();
 296         self.bolls.push(Box::new(SquareBoll {
 297             pos: point!(
 298                 rng.gen_range(0, self.screen.width) as f64,
 299                 rng.gen_range(0, self.screen.height) as f64
 300             ),
 301             vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
 302         }));
 303     }
 304 }
 305
 306 impl AppState for ActiveState {
 307     fn update(&mut self, dt: Nanoseconds) {
 308         for b in &mut self.bolls {
 309             b.update();
 310         }
 311
 312         match dt {
 313             ns if ns < (NS_PER_FRAME - 90_0000) as u64 => self.change_boll_count(100),
 314             ns if ns > (NS_PER_FRAME + 90_0000) as u64 => self.change_boll_count(-100),
 315             _ => {}
 316         }
 317     }
 318
 319     fn render(&mut self, canvas: &mut Canvas<Window>, sprites: &mut SpriteManager) {
 320         /* draw square of blocks */ {
 321             let blocks = 20;
 322             let size = 32;
 323             let offset = point!(
 324                 (self.screen.width as i32 - (blocks + 1) * size) / 2,
 325                 (self.screen.height as i32 - (blocks + 1) * size) / 2
 326             );
 327             let block = sprites.get("block");
 328             for i in 0..blocks {
 329                 canvas
 330                     .copy(
 331                         block,
 332                         None,
 333                         SDLRect::new((i) * size + offset.x, offset.y, size as u32, size as u32),
 334                     )
 335                     .unwrap();
 336                 canvas
 337                     .copy(
 338                         block,
 339                         None,
 340                         SDLRect::new(
 341                             (blocks - i) * size + offset.x,
 342                             (blocks) * size + offset.y,
 343                             size as u32,
 344                             size as u32,
 345                         ),
 346                     )
 347                     .unwrap();
 348                 canvas
 349                     .copy(
 350                         block,
 351                         None,
 352                         SDLRect::new(
 353                             offset.x,
 354                             (blocks - i) * size + offset.y,
 355                             size as u32,
 356                             size as u32,
 357                         ),
 358                     )
 359                     .unwrap();
 360                 canvas
 361                     .copy(
 362                         block,
 363                         None,
 364                         SDLRect::new(
 365                             (blocks) * size + offset.x,
 366                             (i) * size + offset.y,
 367                             size as u32,
 368                             size as u32,
 369                         ),
 370                     )
 371                     .unwrap();
 372             }
 373         }
 374
 375         /* draw mario */ {
 376             let size = 64;
 377             let offset = point!(
 378                 (self.screen.width as i32 - size) / 2,
 379                 (self.screen.height as i32 - size) / 2
 380             );
 381             let radius = 110.0 + size as f32 * 0.5;
 382             let angle = (self.mario_angle as f32 - 90.0) * PI / 180.0;
 383             let offset2 = point!((angle.cos() * radius) as i32, (angle.sin() * radius) as i32);
 384             canvas
 385                 .copy_ex(
 386                     sprites.get("mario"),
 387                     None,
 388                     SDLRect::new(
 389                         offset.x + offset2.x,
 390                         offset.y + offset2.y,
 391                         size as u32,
 392                         size as u32,
 393                     ),
 394                     self.mario_angle,
 395                     sdl2::rect::Point::new(size / 2, size / 2),
 396                     false,
 397                     false,
 398                 )
 399                 .unwrap();
 400             self.mario_angle = (self.mario_angle + 1.0) % 360.0;
 401         }
 402
 403         /* draw circles and ellipses*/ {
 404             let p = point!((self.screen.width / 2) as i16, (self.screen.height / 2) as i16);
 405             canvas
 406                 .circle(p.x, p.y, 100, Color::RGB(255, 255, 255))
 407                 .unwrap();
 408             canvas
 409                 .aa_circle(p.x, p.y, 110, Color::RGB(255, 255, 255))
 410                 .unwrap();
 411             canvas
 412                 .ellipse(p.x, p.y, 50, 100, Color::RGB(255, 255, 255))
 413                 .unwrap();
 414             canvas
 415                 .aa_ellipse(p.x, p.y, 110, 55, Color::RGB(255, 255, 255))
 416                 .unwrap();
 417         }
 418
 419         for b in &self.bolls {
 420             b.draw(canvas, self.boll_size);
 421         }
 422     }
 423
 424     fn leave(&self) {
 425         println!("number of bolls: {}", self.bolls.len());
 426     }
 427
 428     fn on_event(&mut self, event: Event) {
 429         match event {
 430             Event::KeyDown {
 431                 keycode: Some(Keycode::KpPlus),
 432                 ..
 433             } => self.boll_size = std::cmp::min(self.boll_size + 1, 32),
 434             Event::KeyDown {
 435                 keycode: Some(Keycode::KpMinus),
 436                 ..
 437             } => self.boll_size = std::cmp::max(self.boll_size - 1, 1),
 438             Event::MouseMotion { x, y, .. } => self.bolls.push(Box::new(CircleBoll::new(
 439                 point!(x as f64, y as f64),
 440                 point!(0.0, 0.0),
 441             ))),
 442             _ => {}
 443         }
 444     }
 445 }