src/core/app.rs

   1 use boll::*;
   2 use common::{Nanoseconds, 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::PreciseTime;
  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 frame_count: u64 = 0;
 148         // let mut fps_time = PreciseTime::now();
 149         let mut last_time = PreciseTime::now();
 150
 151         self.state.enter(&mut self.ctrl_man);
 152
 153         'running: loop {
 154             if let Err(_) = self.handle_events() {
 155                 break 'running;
 156             }
 157
 158             let duration =
 159                 last_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as Nanoseconds;
 160             last_time = PreciseTime::now();
 161             self.ctrl_man.update(duration);
 162             self.state.update(duration);
 163
 164             self.render();
 165
 166             // frame_count += 1;
 167             // if frame_count == FPS as u64 {
 168             //     let duration = fps_time.to(PreciseTime::now()).num_nanoseconds().unwrap() as f64
 169             //         / 1_000_000_000.0;
 170             //     // println!("fps: {}", frame_count as f64 / duration);
 171             //     frame_count = 0;
 172             //     fps_time = PreciseTime::now();
 173             // }
 174         }
 175
 176         self.state.leave();
 177     }
 178
 179     fn handle_events(&mut self) -> Result<(), ()> {
 180         for event in self.event_pump.poll_iter() {
 181             self.ctrl_man.handle_event(&event);
 182             match event {
 183                 Event::Quit { .. }
 184                 | Event::KeyDown {
 185                     keycode: Some(Keycode::Escape),
 186                     ..
 187                 } => {
 188                     return Err(())
 189                 }
 190                 Event::KeyDown {
 191                     keycode: Some(Keycode::F11),
 192                     ..
 193                 } => {
 194                     match self.canvas.window().fullscreen_state() {
 195                         FullscreenType::Off => self
 196                             .canvas
 197                             .window_mut()
 198                             .set_fullscreen(FullscreenType::Desktop),
 199                         _ => self.canvas.window_mut().set_fullscreen(FullscreenType::Off),
 200                     }
 201                     .unwrap();
 202                 }
 203                 Event::Window {
 204                     win_event: WindowEvent::Resized(x, y),
 205                     ..
 206                 } => {
 207                     println!("window resized({}, {})", x, y)
 208                 }
 209                 Event::Window {
 210                     win_event: WindowEvent::Maximized,
 211                     ..
 212                 } => {
 213                     println!("window maximized")
 214                 }
 215                 Event::Window {
 216                     win_event: WindowEvent::Restored,
 217                     ..
 218                 } => {
 219                     println!("window restored")
 220                 }
 221                 Event::Window {
 222                     win_event: WindowEvent::Enter,
 223                     ..
 224                 } => {
 225                     println!("window enter")
 226                 }
 227                 Event::Window {
 228                     win_event: WindowEvent::Leave,
 229                     ..
 230                 } => {
 231                     println!("window leave")
 232                 }
 233                 Event::Window {
 234                     win_event: WindowEvent::FocusGained,
 235                     ..
 236                 } => {
 237                     println!("window focus gained")
 238                 }
 239                 Event::Window {
 240                     win_event: WindowEvent::FocusLost,
 241                     ..
 242                 } => {
 243                     println!("window focus lost")
 244                 }
 245                 _ => self.state.handle_event(event),
 246             }
 247         }
 248         Ok(())
 249     }
 250
 251     fn render(&mut self) {
 252         self.canvas.set_draw_color(Color::RGB(0, 0, 0));
 253         self.canvas.clear();
 254         self.state.render(&mut self.canvas, &mut self.sprites);
 255         self.canvas.present();
 256     }
 257 }
 258
 259 pub trait AppState {
 260     fn enter(&mut self, ctrl_man: &mut ControllerManager);
 261     fn leave(&mut self);
 262     fn update(&mut self, dt: Nanoseconds);
 263     fn render(&mut self, canvas: &mut Canvas<Window>, sprites: &mut SpriteManager);
 264     fn handle_event(&mut self, event: Event);
 265 }
 266
 267 type Bollar = Vec<Box<dyn Boll>>;
 268
 269 #[derive(Default)]
 270 pub struct ActiveState {
 271     screen: Rect<u32>,
 272     bolls: Bollar,
 273     boll_size: u32,
 274     mario_angle: f64,
 275 }
 276
 277 impl ActiveState {
 278     pub fn new(screen: (u32, u32)) -> ActiveState {
 279         ActiveState {
 280             bolls: Bollar::new(),
 281             boll_size: 1,
 282             screen: Rect::from(screen),
 283             ..Default::default()
 284         }
 285     }
 286
 287     fn change_boll_count(&mut self, delta: i32) {
 288         #[allow(clippy::comparison_chain)]
 289         if delta > 0 {
 290             for _i in 0..delta {
 291                 self.add_boll();
 292             }
 293         } else if delta < 0 {
 294             for _i in 0..(-delta) {
 295                 self.bolls.pop();
 296             }
 297         }
 298     }
 299
 300     fn add_boll(&mut self) {
 301         let mut rng = rand::thread_rng();
 302         self.bolls.push(Box::new(SquareBoll {
 303             pos: point!(
 304                 rng.gen_range(0, self.screen.width) as f64,
 305                 rng.gen_range(0, self.screen.height) as f64
 306             ),
 307             vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
 308         }));
 309     }
 310 }
 311
 312 impl AppState for ActiveState {
 313     fn enter(&mut self, ctrl_man: &mut ControllerManager) {}
 314
 315     fn update(&mut self, dt: Nanoseconds) {
 316         for b in &mut self.bolls {
 317             b.update();
 318         }
 319
 320         match dt {
 321             ns if ns < (NS_PER_FRAME - 90_0000) as u64 => self.change_boll_count(100),
 322             ns if ns > (NS_PER_FRAME + 90_0000) as u64 => self.change_boll_count(-100),
 323             _ => {}
 324         }
 325     }
 326
 327     fn render(&mut self, canvas: &mut Canvas<Window>, sprites: &mut SpriteManager) {
 328         /* draw square of blocks */ {
 329             let blocks = 20;
 330             let size = 32;
 331             let offset = point!(
 332                 (self.screen.width as i32 - (blocks + 1) * size) / 2,
 333                 (self.screen.height as i32 - (blocks + 1) * size) / 2
 334             );
 335             let block = sprites.get("block");
 336             for i in 0..blocks {
 337                 canvas
 338                     .copy(
 339                         block,
 340                         None,
 341                         SDLRect::new((i) * size + offset.x, offset.y, size as u32, size as u32),
 342                     )
 343                     .unwrap();
 344                 canvas
 345                     .copy(
 346                         block,
 347                         None,
 348                         SDLRect::new(
 349                             (blocks - i) * size + offset.x,
 350                             (blocks) * size + offset.y,
 351                             size as u32,
 352                             size as u32,
 353                         ),
 354                     )
 355                     .unwrap();
 356                 canvas
 357                     .copy(
 358                         block,
 359                         None,
 360                         SDLRect::new(
 361                             offset.x,
 362                             (blocks - i) * size + offset.y,
 363                             size as u32,
 364                             size as u32,
 365                         ),
 366                     )
 367                     .unwrap();
 368                 canvas
 369                     .copy(
 370                         block,
 371                         None,
 372                         SDLRect::new(
 373                             (blocks) * size + offset.x,
 374                             (i) * size + offset.y,
 375                             size as u32,
 376                             size as u32,
 377                         ),
 378                     )
 379                     .unwrap();
 380             }
 381         }
 382
 383         /* draw mario */ {
 384             let size = 64;
 385             let offset = point!(
 386                 (self.screen.width as i32 - size) / 2,
 387                 (self.screen.height as i32 - size) / 2
 388             );
 389             let radius = 110.0 + size as f32 * 0.5;
 390             let angle = (self.mario_angle as f32 - 90.0) * PI / 180.0;
 391             let offset2 = point!((angle.cos() * radius) as i32, (angle.sin() * radius) as i32);
 392             canvas
 393                 .copy_ex(
 394                     sprites.get("mario"),
 395                     None,
 396                     SDLRect::new(
 397                         offset.x + offset2.x,
 398                         offset.y + offset2.y,
 399                         size as u32,
 400                         size as u32,
 401                     ),
 402                     self.mario_angle,
 403                     sdl2::rect::Point::new(size / 2, size / 2),
 404                     false,
 405                     false,
 406                 )
 407                 .unwrap();
 408             self.mario_angle = (self.mario_angle + 1.0) % 360.0;
 409         }
 410
 411         /* draw circles and ellipses*/ {
 412             let p = point!((self.screen.width / 2) as i16, (self.screen.height / 2) as i16);
 413             canvas
 414                 .circle(p.x, p.y, 100, Color::RGB(255, 255, 255))
 415                 .unwrap();
 416             canvas
 417                 .aa_circle(p.x, p.y, 110, Color::RGB(255, 255, 255))
 418                 .unwrap();
 419             canvas
 420                 .ellipse(p.x, p.y, 50, 100, Color::RGB(255, 255, 255))
 421                 .unwrap();
 422             canvas
 423                 .aa_ellipse(p.x, p.y, 110, 55, Color::RGB(255, 255, 255))
 424                 .unwrap();
 425         }
 426
 427         for b in &self.bolls {
 428             b.draw(canvas, self.boll_size);
 429         }
 430     }
 431
 432     fn leave(&mut self) {
 433         println!("number of bolls: {}", self.bolls.len());
 434     }
 435
 436     fn handle_event(&mut self, event: Event) {
 437         match event {
 438             Event::KeyDown {
 439                 keycode: Some(Keycode::KpPlus),
 440                 ..
 441             } => self.boll_size = std::cmp::min(self.boll_size + 1, 32),
 442             Event::KeyDown {
 443                 keycode: Some(Keycode::KpMinus),
 444                 ..
 445             } => self.boll_size = std::cmp::max(self.boll_size - 1, 1),
 446             Event::MouseMotion { x, y, .. } => self.bolls.push(Box::new(CircleBoll::new(
 447                 point!(x as f64, y as f64),
 448                 point!(0.0, 0.0),
 449             ))),
 450             _ => {}
 451         }
 452     }
 453 }