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             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     #[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         let screen = self.canvas.output_size().unwrap();
 150         let screen = Rect::from((screen.0 as i32, screen.1 as i32));
 151
 152         let mut mario_angle = 0.0;
 153
 154         'running: loop {
 155             self.canvas.set_draw_color(Color::RGB(0, 0, 0));
 156             self.canvas.clear();
 157             {
 158                 let blocks = 20;
 159                 let size = 32;
 160                 let offset = point!(
 161                     (screen.width - (blocks + 1) * size) / 2,
 162                     (screen.height - (blocks + 1) * size) / 2
 163                 );
 164                 let block = self.sprites.get("block");
 165                 for i in 0..blocks {
 166                     self.canvas
 167                         .copy(
 168                             block,
 169                             None,
 170                             SDLRect::new((i) * size + offset.x, offset.y, size as u32, size as u32),
 171                         )
 172                         .unwrap();
 173                     self.canvas
 174                         .copy(
 175                             block,
 176                             None,
 177                             SDLRect::new(
 178                                 (blocks - i) * size + offset.x,
 179                                 (blocks) * size + offset.y,
 180                                 size as u32,
 181                                 size as u32,
 182                             ),
 183                         )
 184                         .unwrap();
 185                     self.canvas
 186                         .copy(
 187                             block,
 188                             None,
 189                             SDLRect::new(
 190                                 offset.x,
 191                                 (blocks - i) * size + offset.y,
 192                                 size as u32,
 193                                 size as u32,
 194                             ),
 195                         )
 196                         .unwrap();
 197                     self.canvas
 198                         .copy(
 199                             block,
 200                             None,
 201                             SDLRect::new(
 202                                 (blocks) * size + offset.x,
 203                                 (i) * size + offset.y,
 204                                 size as u32,
 205                                 size as u32,
 206                             ),
 207                         )
 208                         .unwrap();
 209                 }
 210             }
 211             {
 212                 let size = 64;
 213                 let offset = point!(
 214                     (screen.width - size) / 2,
 215                     (screen.height - size) / 2
 216                 );
 217                 let radius = 110.0 + size as f32 * 0.5;
 218                 let angle = (mario_angle as f32 - 90.0) * PI / 180.0;
 219                 let offset2 = point!((angle.cos() * radius) as i32, (angle.sin() * radius) as i32);
 220                 self.canvas
 221                     .copy_ex(
 222                         self.sprites.get("mario"),
 223                         None,
 224                         SDLRect::new(
 225                             offset.x + offset2.x,
 226                             offset.y + offset2.y,
 227                             size as u32,
 228                             size as u32,
 229                         ),
 230                         mario_angle,
 231                         sdl2::rect::Point::new(size / 2, size / 2),
 232                         false,
 233                         false,
 234                     )
 235                     .unwrap();
 236                 mario_angle += 1.0;
 237                 if mario_angle >= 360.0 {
 238                     mario_angle -= 360.0
 239                 }
 240             }
 241             {
 242                 let p = point!((screen.width / 2) as i16, (screen.height / 2) as i16);
 243                 self.canvas
 244                     .circle(p.x, p.y, 100, Color::RGB(255, 255, 255))
 245                     .unwrap();
 246                 self.canvas
 247                     .aa_circle(p.x, p.y, 110, Color::RGB(255, 255, 255))
 248                     .unwrap();
 249                 self.canvas
 250                     .ellipse(p.x, p.y, 50, 100, Color::RGB(255, 255, 255))
 251                     .unwrap();
 252                 self.canvas
 253                     .aa_ellipse(p.x, p.y, 110, 55, Color::RGB(255, 255, 255))
 254                     .unwrap();
 255             }
 256
 257             //        window.gl_swap_window();
 258             for event in self.event_pump.poll_iter() {
 259                 match event {
 260                     Event::Quit { .. }
 261                     | Event::KeyDown {
 262                         keycode: Some(Keycode::Escape),
 263                         ..
 264                     } => {
 265                         break 'running;
 266                     }
 267                     Event::KeyDown {
 268                         keycode: Some(Keycode::F11),
 269                         ..
 270                     } => {
 271                         match self.canvas.window().fullscreen_state() {
 272                             FullscreenType::Off => self
 273                                 .canvas
 274                                 .window_mut()
 275                                 .set_fullscreen(FullscreenType::Desktop),
 276                             _ => self.canvas.window_mut().set_fullscreen(FullscreenType::Off),
 277                         }
 278                         .unwrap();
 279                     }
 280                     Event::Window {
 281                         win_event: WindowEvent::Resized(x, y),
 282                         ..
 283                     } => {
 284                         println!("window resized({}, {})", x, y)
 285                     }
 286                     Event::Window {
 287                         win_event: WindowEvent::Maximized,
 288                         ..
 289                     } => {
 290                         println!("window maximized")
 291                     }
 292                     Event::Window {
 293                         win_event: WindowEvent::Restored,
 294                         ..
 295                     } => {
 296                         println!("window restored")
 297                     }
 298                     Event::Window {
 299                         win_event: WindowEvent::Enter,
 300                         ..
 301                     } => {
 302                         println!("window enter")
 303                     }
 304                     Event::Window {
 305                         win_event: WindowEvent::Leave,
 306                         ..
 307                     } => {
 308                         println!("window leave")
 309                     }
 310                     Event::Window {
 311                         win_event: WindowEvent::FocusGained,
 312                         ..
 313                     } => {
 314                         println!("window focus gained")
 315                     }
 316                     Event::Window {
 317                         win_event: WindowEvent::FocusLost,
 318                         ..
 319                     } => {
 320                         println!("window focus lost")
 321                     }
 322                     _ => self.state.on_event(event),
 323                 }
 324             }
 325
 326             let duration =
 327                 last_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as Nanoseconds;
 328             last_time = PreciseTime::now();
 329             self.state.update(duration);
 330             self.state.render(&mut self.canvas);
 331             self.canvas.present();
 332
 333             frame_count += 1;
 334             if frame_count == FPS as u64 {
 335                 let duration = fps_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as f64
 336                     / 1_000_000_000.0;
 337                 println!("fps: {}", frame_count as f64 / duration);
 338                 frame_count = 0;
 339                 fps_time = PreciseTime::now();
 340             }
 341         }
 342
 343         self.state.leave();
 344     }
 345 }
 346
 347 pub trait AppState {
 348     fn update(&mut self, dt: Nanoseconds);
 349     fn render(&self, canvas: &mut Canvas<Window>);
 350     fn leave(&self);
 351     fn on_event(&mut self, event: Event);
 352 }
 353
 354 type Bollar = Vec<Box<dyn Boll>>;
 355
 356 pub struct ActiveState {
 357     screen: Rect<u32>,
 358     bolls: Bollar,
 359     boll_size: u32,
 360 }
 361
 362 impl ActiveState {
 363     pub fn new(screen: (u32, u32)) -> ActiveState {
 364         ActiveState {
 365             bolls: Bollar::new(),
 366             boll_size: 1,
 367             screen: Rect::from(screen),
 368         }
 369     }
 370
 371     fn change_boll_count(&mut self, delta: i32) {
 372         #[allow(clippy::comparison_chain)]
 373         if delta > 0 {
 374             for _i in 0..delta {
 375                 self.add_boll();
 376             }
 377         } else if delta < 0 {
 378             for _i in 0..(-delta) {
 379                 self.bolls.pop();
 380             }
 381         }
 382     }
 383
 384     fn add_boll(&mut self) {
 385         let mut rng = rand::thread_rng();
 386         self.bolls.push(Box::new(SquareBoll {
 387             pos: point!(
 388                 rng.gen_range(0, self.screen.width) as f64,
 389                 rng.gen_range(0, self.screen.height) as f64
 390             ),
 391             vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
 392         }));
 393     }
 394 }
 395
 396 impl AppState for ActiveState {
 397     fn update(&mut self, dt: Nanoseconds) {
 398         for b in &mut self.bolls {
 399             b.update();
 400         }
 401
 402         match dt {
 403             ns if ns < (NS_PER_FRAME - 90_0000) as u64 => self.change_boll_count(100),
 404             ns if ns > (NS_PER_FRAME + 90_0000) as u64 => self.change_boll_count(-100),
 405             _ => {}
 406         }
 407     }
 408
 409     fn render(&self, canvas: &mut Canvas<Window>) {
 410         for b in &self.bolls {
 411             b.draw(canvas, self.boll_size);
 412         }
 413     }
 414
 415     fn leave(&self) {
 416         println!("number of bolls: {}", self.bolls.len());
 417     }
 418
 419     fn on_event(&mut self, event: Event) {
 420         match event {
 421             Event::KeyDown {
 422                 keycode: Some(Keycode::KpPlus),
 423                 ..
 424             } => self.boll_size = std::cmp::min(self.boll_size + 1, 32),
 425             Event::KeyDown {
 426                 keycode: Some(Keycode::KpMinus),
 427                 ..
 428             } => self.boll_size = std::cmp::max(self.boll_size - 1, 1),
 429             Event::MouseMotion { x, y, .. } => self.bolls.push(Box::new(CircleBoll::new(
 430                 point!(x as f64, y as f64),
 431                 point!(0.0, 0.0),
 432             ))),
 433             _ => {}
 434         }
 435     }
 436 }