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