Prepare to add a flight mode

src/bin/pumpkin.rs

@@ -90,7 +90,22 @@ impl EulerAngles {
 	}
 }
 
-struct WorldState {
+enum PlayMode {
+	WindTunnel,
+	FreeFlight,
+}
+
+#[derive (Copy, Clone, PartialEq, Eq)]
+enum UserControl {
+	Camera,
+	Wind,
+	Airplane,
+	Sunlight,
+}
+
+struct WindTunnelState {
+	user_control: UserControl,
+	
 	camera: EulerAngles,
 	wind: EulerAngles,
 	airplane: EulerAngles,
@@ -98,30 +113,39 @@ struct WorldState {
 	spin_speed: i32,
 }
 
-impl WorldState {
-	pub fn new () -> Self {
-		Self {
-			camera: Default::default (),
-			wind: Default::default (),
-			airplane: Default::default (),
-			sunlight: EulerAngles {
-				altitude: 90.0,
-				azimuth: 0.0,
+struct WorldState {
+	play_mode: PlayMode,
+	wind_tunnel: WindTunnelState,
+}
+
+impl WindTunnelState {
+	pub fn handle_event (&mut self, event: &sdl2::event::Event) {
+		match event {
+			Event::KeyDown { keycode: Some (Keycode::C), .. } => {
+				self.user_control = UserControl::Camera;
 			},
-			spin_speed: 0,
+			Event::KeyDown { keycode: Some (Keycode::W), .. } => {
+				self.user_control = UserControl::Wind;
+			},
+			Event::KeyDown { keycode: Some (Keycode::P), .. } => {
+				self.user_control = UserControl::Airplane;
+			},
+			Event::KeyDown { keycode: Some (Keycode::L), .. } => {
+				self.user_control = UserControl::Sunlight;
+			},
+			_ => (),
 		}
 	}
 	
 	pub fn step (
 		&mut self, 
-		controller: &ControllerState,
-		user_control: &UserControl
+		controller: &ControllerState
 	) {
 		const SPIN_RAMP_TIME: i32 = 30;
 		
 		let spin_f = 4.0 * self.spin_speed as f32 / SPIN_RAMP_TIME as f32;
 		
-		let controlled_angle = match user_control {
+		let controlled_angle = match self.user_control {
 			UserControl::Camera => &mut self.camera,
 			UserControl::Wind => &mut self.wind,
 			UserControl::Airplane => &mut self.airplane,
@@ -150,6 +174,47 @@ impl WorldState {
 	}
 }
 
+impl WorldState {
+	pub fn new () -> Self {
+		Self {
+			play_mode: PlayMode::WindTunnel,
+			wind_tunnel: WindTunnelState {
+				user_control: UserControl::Camera,
+				camera: Default::default (),
+				wind: Default::default (),
+				airplane: Default::default (),
+				sunlight: EulerAngles {
+					altitude: 90.0,
+					azimuth: 0.0,
+				},
+				spin_speed: 0,
+			},
+		}
+	}
+	
+	pub fn handle_event (&mut self, event: &sdl2::event::Event) {
+		match event {
+			Event::KeyDown { keycode: Some (Keycode::T), .. } => {
+				self.play_mode = PlayMode::WindTunnel;
+			},
+			_ => match self.play_mode {
+				PlayMode::WindTunnel => self.wind_tunnel.handle_event (event),
+				_ => (),
+			},
+		}
+	}
+	
+	pub fn step (
+		&mut self, 
+		controller: &ControllerState
+	) {
+		match self.play_mode {
+			PlayMode::WindTunnel => self.wind_tunnel.step (controller),
+			_ => (),
+		}
+	}
+}
+
 mod uniforms {
 use iota::iota;
 iota! {
@@ -866,12 +931,25 @@ impl GameGraphics {
 			green,
 		];
 		
+		let proj_mat = Mat4::perspective_rh_gl (30.0f32.to_radians (), 1280.0 / 720.0, 0.5, 500.0);
+		
+		let view_mat = match state.play_mode {
+			PlayMode::WindTunnel => {
+				let state = &state.wind_tunnel;
+				
 				let longitude = state.camera.azimuth.to_radians ();
 				let latitude = (state.camera.altitude - 90.0).to_radians ();
 				
-		let proj_mat = Mat4::perspective_rh_gl (30.0f32.to_radians (), 1280.0 / 720.0, 0.5, 500.0);
+				proj_mat *
+				Mat4::from_translation (Vec3::from ((0.0, 0.0, -8.0))) *
+				Mat4::from_rotation_x (latitude) *
+				Mat4::from_rotation_z (longitude) *
+				Mat4::from_translation ((0.0, 0.0, -2.7 * 0.5).into ())
+			},
+			_ => proj_mat,
+		};
 		
-		let light = state.sunlight.to_vec3 ();
+		let light = state.wind_tunnel.sunlight.to_vec3 ();
 		
 		let shadow_mat = {
 			let mut mat = Mat4::identity ();
@@ -879,12 +957,7 @@ impl GameGraphics {
 			mat
 		};
 		
-		let view_mat = proj_mat *
-		Mat4::from_translation (Vec3::from ((0.0, 0.0, -8.0))) *
-		Mat4::from_rotation_x (latitude) *
-		Mat4::from_rotation_z (longitude) *
-		Mat4::from_translation ((0.0, 0.0, -2.7 * 0.5).into ())
-		;
+		
 		
 		let sky_mvp_mat = view_mat * Mat4::from_scale ((16.0, 16.0, 16.0).into ());
 		
@@ -897,12 +970,16 @@ impl GameGraphics {
 			glezz::clear (gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT | gl::STENCIL_BUFFER_BIT);
 		});
 		
-		let airplane_model_mat = 
+		let airplane_model_mat = match state.play_mode {
+			PlayMode::WindTunnel => {
+				let state = &state.wind_tunnel;
 				Mat4::from_translation ((0.0, 0.0, 2.7 * 0.5).into ()) *
 				Mat4::from_scale ((0.125, 0.125, 0.125).into ()) *
 				Mat4::from_rotation_z (state.airplane.azimuth.to_radians ()) *
 				Mat4::from_rotation_x (state.airplane.altitude.to_radians ())
-		;
+			},
+			_ => Mat4::identity (),
+		};
 		
 		let world_model_mat = Mat4::identity ();
 		let inverse_pumpkin = airplane_model_mat.inverse ();
@@ -1044,14 +1121,6 @@ impl GameGraphics {
 	}
 }
 
-#[derive (Copy, Clone, PartialEq, Eq)]
-enum UserControl {
-	Camera,
-	Wind,
-	Airplane,
-	Sunlight,
-}
-
 fn main () {
 	let sdl_context = sdl2::init ().unwrap ();
 	let video_subsystem = sdl_context.video ().unwrap ();
@@ -1078,7 +1147,6 @@ fn main () {
 	let graphics = GameGraphics::new ();
 	let mut gl_state = Default::default ();
 	
-	let mut user_control = UserControl::Camera;
 	let mut graphics_frames = 0;
 	
 	let mut event_pump = sdl_context.event_pump ().unwrap ();
@@ -1093,37 +1161,16 @@ fn main () {
 				Event::KeyDown { keycode: Some (Keycode::Escape), .. } => {
 					break 'running
 				},
-				Event::KeyDown { keycode: Some (Keycode::C), .. } => {
-					user_control = UserControl::Camera;
-				},
-				Event::KeyDown { keycode: Some (Keycode::W), .. } => {
-					user_control = UserControl::Wind;
-				},
-				Event::KeyDown { keycode: Some (Keycode::P), .. } => {
-					user_control = UserControl::Airplane;
-				},
-				Event::KeyDown { keycode: Some (Keycode::L), .. } => {
-					user_control = UserControl::Sunlight;
-				},
-				_ => (),
+				_ => state.handle_event (&event),
 			}
 		}
 		
 		let controller = ControllerState::from_sdl_keyboard (&event_pump.keyboard_state ());
 		
 		for _ in 0..frames_to_do {
-			state.step (&controller, &user_control);
+			state.step (&controller);
 		}
 		
-		let purple = (1.0, 0.5, 1.0).into ();
-		
-		let origin: Vec3 = (0.0, 0.0, 1.35).into ();
-		let gravity = (0.0, 0.0, -1.0).into ();
-		
-		let wind = state.wind.to_vec3 () * -1.0;
-		let wind_force = (wind.x (), 0.125 * wind.y (), wind.z ()).into ();
-		
-		
 		let control_flash = if graphics_frames % 16 >= 8 {
 			(1.0, 1.0, 1.0).into ()
 		}
@@ -1131,8 +1178,19 @@ fn main () {
 			(1.0, 0.0, 0.0).into ()
 		};
 		
+		let arrows = match state.play_mode {
+			PlayMode::WindTunnel => {
+				let state = &state.wind_tunnel;
+				let purple = (1.0, 0.5, 1.0).into ();
+		
+				let origin: Vec3 = (0.0, 0.0, 1.35).into ();
+				let gravity = (0.0, 0.0, -1.0).into ();
+				
+				let wind = state.wind.to_vec3 () * -1.0;
+				let wind_force = (wind.x (), 0.125 * wind.y (), wind.z ()).into ();
+				
 				let get_flash = |control_type, default_color| {
-			if user_control == control_type {
+					if state.user_control == control_type {
 						control_flash
 					}
 					else {
@@ -1140,7 +1198,7 @@ fn main () {
 					}
 				};
 				
-		let arrows = vec![
+				vec![
 					Arrow {
 						origin: (0.0, 0.0, 1.35).into (),
 						direction: gravity,
@@ -1161,7 +1219,10 @@ fn main () {
 						direction: state.airplane.to_vec3 () * 0.5,
 						color: get_flash (UserControl::Airplane, (0.0, 0.0, 0.0).into ()),
 					}
-		];
+				]
+			},
+			_ => vec![],
+		};
 		
 		let renderable_arrows: Vec <_> = arrows.iter ().map (|arrow| {
 			let dir_len = arrow.direction.length ();