Add camera movement

src/input.rs

@@ -0,0 +1,54 @@
+use std::mem;
+
+use winit::{
+    event::{ElementState, KeyEvent},
+    keyboard::{KeyCode, PhysicalKey},
+};
+
+#[derive(Default)]
+pub struct InputState {
+    mouse_delta_x: f64,
+    mouse_delta_y: f64,
+
+    pub forward: bool,
+    pub backwards: bool,
+    pub left: bool,
+    pub right: bool,
+    pub up: bool,
+    pub down: bool,
+}
+
+impl InputState {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn add_mouse_motion(&mut self, dx: f64, dy: f64) {
+        self.mouse_delta_x += dx;
+        self.mouse_delta_y += dy;
+    }
+
+    pub fn mouse_delta(&mut self) -> (f64, f64) {
+        let dx = mem::replace(&mut self.mouse_delta_x, 0.0);
+        let dy = mem::replace(&mut self.mouse_delta_y, 0.0);
+        (dx, dy)
+    }
+
+    pub fn key_event(&mut self, event: KeyEvent) {
+        let PhysicalKey::Code(key) = event.physical_key else {
+            return;
+        };
+        let pressed = event.state == ElementState::Pressed;
+
+        match key {
+            KeyCode::KeyW => self.forward = pressed,
+            KeyCode::KeyS => self.backwards = pressed,
+            KeyCode::KeyA => self.left = pressed,
+            KeyCode::KeyD => self.right = pressed,
+            KeyCode::Space => self.up = pressed,
+            KeyCode::ShiftLeft => self.down = pressed,
+            _ => (),
+        }
+    }
+}
+

src/main.rs

@@ -5,6 +5,7 @@ use std::{process::ExitCode, sync::Arc, time::Instant};
 
 use error::Error;
 use glam::Vec3;
+use input::InputState;
 use render::{
     asset::{AssetLoader, TextureLoadStage},
     Renderer,
@@ -14,11 +15,12 @@ use winit::{
     dpi::PhysicalSize,
     event::{DeviceEvent, DeviceId, StartCause, WindowEvent},
     event_loop::{ActiveEventLoop, EventLoop},
-    window::{Window, WindowId},
+    window::{CursorGrabMode, Window, WindowId},
 };
-use world::{Chunk, ChunkGenerator, NoiseChunkGenerator, World};
+use world::{camera::Camera, ChunkGenerator, NoiseChunkGenerator, World};
 
 pub mod error;
+pub mod input;
 pub mod render;
 pub mod world;
 
@@ -27,9 +29,10 @@ pub struct Engine {
     renderer: Option<Renderer>,
     assets: Option<AssetLoader<TextureLoadStage>>,
     world: Option<World>,
-    camera_position: Vec3,
+    input: InputState,
+    camera: Camera,
     generator: Box<dyn ChunkGenerator>,
-    start: Instant,
+    last_frame: Instant,
 }
 
 impl Engine {
@@ -41,6 +44,10 @@ impl Engine {
                 .with_inner_size(PhysicalSize::new(800, 600));
 
             let window = Arc::new(event_loop.create_window(window_attributes)?);
+
+            window.set_cursor_grab(CursorGrabMode::Locked).ok();
+            window.set_cursor_visible(false);
+
             let render = Renderer::from_window(window.clone(), assets)?;
 
             self.window = Some(window);
@@ -49,6 +56,42 @@ impl Engine {
 
         Ok(())
     }
+
+    pub fn update_camera(&mut self, dt: f64) {
+        const SENSITIVITY: f64 = 0.15;
+        const HORIZONTAL_SPEED: f32 = 17.5;
+        const VERTICAL_SPEED: f32 = 15.0;
+
+        let (mouse_dx, mouse_dy) = self.input.mouse_delta();
+        let mouse_dx = mouse_dx * dt * SENSITIVITY;
+        let mouse_dy = mouse_dy * dt * SENSITIVITY;
+
+        self.camera.turn(mouse_dy as f32, mouse_dx as f32);
+
+        let want_dz = self.input.forward as i32 - self.input.backwards as i32;
+        let want_dx = self.input.right as i32 - self.input.left as i32;
+        let want_dy = self.input.up as i32 - self.input.down as i32;
+
+        if want_dx == 0 && want_dy == 0 && want_dz == 0 {
+            return;
+        }
+
+        let want_horizontal_vector = if want_dx != 0 || want_dz != 0 {
+            let look_vector = self.camera.horizontal_look_vector();
+            let right_vector = look_vector.cross(Vec3::Y);
+            ((want_dx as f32) * right_vector + (want_dz as f32) * look_vector).normalize()
+        } else {
+            Vec3::ZERO
+        };
+
+        let want_vertical_vector = (want_dy as f32) * Vec3::Y;
+
+        let horizontal_vector = want_horizontal_vector * dt as f32 * HORIZONTAL_SPEED;
+        let vertical_vector = want_vertical_vector * dt as f32 * VERTICAL_SPEED;
+
+        self.camera
+            .move_towards(horizontal_vector + vertical_vector);
+    }
 }
 
 impl ApplicationHandler for Engine {
@@ -99,24 +142,23 @@ impl ApplicationHandler for Engine {
                 }
             }
             WindowEvent::RedrawRequested => {
+                let frame_delta = self.last_frame.elapsed();
+                self.last_frame = Instant::now();
+                let frame_dt = frame_delta.as_secs_f64();
+                self.update_camera(frame_dt);
+
                 if let (Some(render), Some(world)) = (self.renderer.as_mut(), self.world.as_mut()) {
-                    let delta = self.start.elapsed();
-                    let dt = delta.as_secs_f64();
+                    let camera_position = self.camera.position();
 
-                    self.camera_position = Vec3::new(
-                        (dt.cos() * 32.0) as f32 + (Chunk::SIZE / 2) as f32,
-                        48.0,
-                        (dt.sin() * 32.0) as f32 + (Chunk::SIZE / 2) as f32,
-                    );
+                    world.update_with_camera(camera_position, &mut *self.generator);
 
-                    world.update_with_camera(self.camera_position, &mut *self.generator);
-
-                    if let Err(error) = render.render(self.camera_position, world) {
+                    if let Err(error) = render.render(&mut self.camera, world) {
                         log::error!("Render error: {error}");
                         event_loop.exit();
                     }
                 }
             }
+            WindowEvent::KeyboardInput { event, .. } => self.input.key_event(event),
             _ => (),
         }
     }
@@ -129,7 +171,10 @@ impl ApplicationHandler for Engine {
     ) {
         let _ = event_loop;
         let _ = device_id;
-        let _ = event;
+
+        if let DeviceEvent::MouseMotion { delta } = event {
+            self.input.add_mouse_motion(delta.0, delta.1);
+        }
     }
 
     fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
@@ -156,9 +201,10 @@ fn run() -> Result<(), Error> {
         renderer: None,
         assets: Some(loader),
         world: Some(world),
-        camera_position: Vec3::ZERO,
+        camera: Camera::new(),
+        input: InputState::new(),
         generator: Box::new(NoiseChunkGenerator::from_seed(1234)),
-        start: Instant::now(),
+        last_frame: Instant::now(),
     };
 
     event_loop.run_app(&mut engine)?;

src/render/mod.rs

@@ -4,7 +4,7 @@ use std::{
 };
 
 use asset::{AssetLoader, TextureLoadStage};
-use glam::{Mat4, Vec3};
+use glam::Mat4;
 use mesh::WorldMeshState;
 use util::{Allocators, ViewportExt};
 use vertex::InputVertex;
@@ -38,7 +38,7 @@ use winit::window::Window;
 
 use crate::{
     error::Error,
-    world::{Chunk, ChunkCoords, World},
+    world::{camera::Camera, Chunk, ChunkCoords, World},
 };
 
 pub mod asset;
@@ -241,7 +241,7 @@ impl Renderer {
         })
     }
 
-    pub fn render(&mut self, camera_position: Vec3, world: &mut World) -> Result<(), Error> {
+    pub fn render(&mut self, camera: &mut Camera, world: &mut World) -> Result<(), Error> {
         self.fps.new_frame();
         self.fps.update();
 
@@ -270,15 +270,16 @@ impl Renderer {
 
         let model = Mat4::IDENTITY;
         let projection = Mat4::perspective_rh_gl(45.0f32.to_radians(), aspect, 0.01, 1000.0);
+        let view = camera.transform();
 
-        fn make_view(camera: Vec3, target: Vec3) -> Mat4 {
-            Mat4::look_at_rh(camera, target, Vec3::Y)
-        }
+        // fn make_view(camera: Vec3, target: Vec3) -> Mat4 {
+        //     Mat4::look_at_rh(camera, target, Vec3::Y)
+        // }
 
-        let view = make_view(
-            camera_position,
-            Vec3::new((Chunk::SIZE / 2) as f32, 32.0, (Chunk::SIZE / 2) as f32),
-        );
+        // let view = make_view(
+        //     camera_position,
+        //     Vec3::new((Chunk::SIZE / 2) as f32, 32.0, (Chunk::SIZE / 2) as f32),
+        // );
 
         let set0 = {
             let uniform_buffer = self
@@ -352,6 +353,7 @@ impl Renderer {
             (x as i32 + Chunk::SIZE as i32 / 2) / Chunk::SIZE as i32
         }
 
+        let camera_position = camera.position();
         let camera_cx = cpos(camera_position.x);
         let camera_cz = cpos(camera_position.z);
 

src/world/camera.rs

@@ -0,0 +1,62 @@
+use glam::{EulerRot, Mat4, Vec3, Vec4, Vec4Swizzles};
+
+pub struct Camera {
+    position: Vec3,
+    yaw: f32,
+    pitch: f32,
+
+    transform: Mat4,
+    dirty: bool,
+}
+
+impl Camera {
+    pub fn new() -> Self {
+        Self {
+            position: Vec3::ZERO,
+            yaw: 0.0,
+            pitch: 0.0,
+            transform: Mat4::IDENTITY,
+            dirty: true,
+        }
+    }
+
+    pub fn position(&self) -> Vec3 {
+        self.position
+    }
+
+    pub fn move_to(&mut self, position: Vec3) {
+        self.position = position;
+        self.dirty = true;
+    }
+
+    pub fn move_towards(&mut self, delta: Vec3) {
+        self.position += delta;
+        self.dirty = true;
+    }
+
+    pub fn turn(&mut self, pitch: f32, yaw: f32) {
+        self.pitch += pitch;
+        self.yaw += yaw;
+        self.dirty = true;
+    }
+
+    pub fn horizontal_look_vector(&self) -> Vec3 {
+        Vec3::new(self.yaw.cos(), 0.0, self.yaw.sin())
+    }
+
+    pub fn look_vector(&self) -> Vec3 {
+        (Mat4::from_euler(EulerRot::XYZ, 0.0, -self.yaw, -self.pitch)
+            * Vec4::new(1.0, 0.0, 0.0, 0.0))
+        .xyz()
+    }
+
+    pub fn transform(&mut self) -> &Mat4 {
+        if self.dirty {
+            let look_vector = self.look_vector();
+            self.transform = Mat4::look_to_rh(self.position, look_vector, Vec3::Y);
+        }
+
+        &self.transform
+    }
+}
+

src/world/mod.rs

@@ -1,5 +1,6 @@
 use bitflags::bitflags;
 
+pub mod camera;
 pub mod chunk;
 pub mod feature;
 pub mod generator;