src/core/app.rs

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