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