adding camera controller

src/app.rs

@@ -1,3 +1,5 @@
+use std::sync::Arc;
+use winit::event::Event;
 use winit::{window::Window, dpi::PhysicalSize, event::WindowEvent};
 use wgpu::util::DeviceExt;
 use futures::executor::block_on;
@@ -6,6 +8,7 @@ use crate::vertex::Vertex;
 use crate::texture::Texture;
 use crate::camera::Camera;
 use crate::uniforms::Uniforms;
+use crate::camera_controller::CameraController;
 
 const VERTICES: &[Vertex] = &[
     Vertex { position: [-1.0, 1.0, 0.0], uv: [0.0, 0.0] },
@@ -35,7 +38,9 @@ pub struct App {
     // Texture
     bind_group: wgpu::BindGroup,
     // Camera
-    camera: Camera
+    camera: Camera,
+    camera_controller: CameraController,
+    uniforms: Uniforms
 }
 
 impl App {
@@ -46,7 +51,7 @@ impl App {
             format: adapter.get_swap_chain_preferred_format(&surface),
             width: size.width,
             height: size.height,
-            present_mode: wgpu::PresentMode::Fifo,
+            present_mode: wgpu::PresentMode::Mailbox, // Fifo = Vsync
         };
         let swapchain = device.create_swap_chain(&surface, &swapchain_desc);
         (swapchain_desc, swapchain)
@@ -209,9 +214,10 @@ impl App {
 
         // Cam
         let aspect = swapchain_desc.width as f32 / swapchain_desc.height as f32;
-        let camera = Camera::new((0.0, 1.0, 2.0).into(), (0.0, 0.0, 0.0).into(), aspect);
+        let camera = Camera::new((0.0, 0.0, 2.0).into(), (0.0, 0.0, -1.0).into(), aspect);
         let mut uniforms = Uniforms::new();
         uniforms.update_projection_matrix(&camera);
+        let camera_controller = CameraController::new(2.0);
 
         // Buffers
         let vertex_buffer = Self::create_buffer(&device, wgpu::BufferUsage::VERTEX, bytemuck::cast_slice(VERTICES));
@@ -229,7 +235,7 @@ impl App {
 
         // Save values in app
         println!("Initialized");
-        Self { surface, device, queue, swapchain_desc, swapchain, pipeline, vertex_buffer, index_buffer, uniform_buffer, bind_group, uniform_bind_group, camera,  }
+        Self { surface, device, queue, swapchain_desc, swapchain, pipeline, vertex_buffer, index_buffer, uniform_buffer, bind_group, uniform_bind_group, camera, uniforms, camera_controller }
     }
 
     pub fn resize(&mut self, new_size: Option<PhysicalSize<u32>>) {
@@ -239,20 +245,28 @@ impl App {
             // Recreate swapchain
             self.swapchain_desc.width = size.width;
             self.swapchain_desc.height = size.height;
+            // Update camera
+            self.camera.set_aspect(size.width as f32 / size.height as f32);
         }
         // Recreate swapchain
         self.swapchain = self.device.create_swap_chain(&self.surface, &self.swapchain_desc);
     }
 
-    pub fn input(&mut self, _event: &WindowEvent) -> bool {
-        false
+    pub fn input(&mut self, event: Arc<Event<()>>) -> bool {
+        self.camera_controller.handle_input(event.as_ref())
     }
 
-    pub fn update(&mut self) {
-        // Nothing right now
+    pub fn update(&mut self, delta_time: f32) {
+        // Update camera
+        self.camera_controller.update_camera(&mut self.camera, delta_time);
+
+        // Update projection matrix buffer
+        self.uniforms.update_projection_matrix(&self.camera);
+        self.queue.write_buffer(&self.uniform_buffer, 0, bytemuck::cast_slice(&[self.uniforms]));
     }
 
     pub fn render(&mut self) -> Result<(), wgpu::SwapChainError> {
+
         // Get next frame to render to
         let frame = self.swapchain.get_current_frame()?.output;
         // Create encoder that will build command buffer for us

src/camera.rs

@@ -9,9 +9,9 @@ const OPENGL_TO_WGPU_MATRIX: cgmath::Matrix4<f32> = cgmath::Matrix4::new(
 );
 
 pub struct Camera {
-    pos: Point3<f32>,
-    target: Point3<f32>,
-    up: Vector3<f32>,
+    pub position: Point3<f32>,
+    pub forward: Vector3<f32>,
+    pub up: Vector3<f32>,
     aspect: f32,
     fovy: f32,
     znear: f32,
@@ -20,10 +20,10 @@ pub struct Camera {
 
 impl Camera {
 
-    pub fn new(pos: Point3<f32>, target: Point3<f32>, aspect: f32) -> Self {
+    pub fn new(position: Point3<f32>, forward: Vector3<f32>, aspect: f32) -> Self {
         Self {
-            pos,
-            target,
+            position,
+            forward,
             up: Vector3::unit_y(),
             aspect,
             fovy: 45.0,
@@ -32,8 +32,12 @@ impl Camera {
         }
     }
 
+    pub fn set_aspect(&mut self, aspect: f32) {
+        self.aspect = aspect;
+    }
+
     pub fn projection_matrix(&self) -> Matrix4<f32> {
-        let view = Matrix4::look_at_rh(self.pos, self.target, self.up);
+        let view = Matrix4::look_to_rh(self.position, self.forward, self.up);
         let proj = cgmath::perspective(Deg(self.fovy), self.aspect, self.znear, self.zfar);
         return OPENGL_TO_WGPU_MATRIX * proj * view;
     }

src/camera_controller.rs

@@ -0,0 +1,92 @@
+use winit::event::Event;
+use winit::event::{WindowEvent, DeviceEvent, KeyboardInput, ElementState, VirtualKeyCode};
+use cgmath::InnerSpace;
+use crate::camera::Camera;
+
+#[derive(Default)]
+struct CameraMovement {
+    pub up: bool,
+    pub down: bool,
+    pub fwd: bool,
+    pub back: bool,
+    pub left: bool,
+    pub right: bool,
+}
+
+struct CameraRotation {
+    pub yaw: f32,   // vertical axis
+    pub pitch: f32, // horizontal axis
+    pub last_update: Option<std::time::Instant>
+}
+
+
+pub struct CameraController {
+    movement: CameraMovement,
+    rotation: CameraRotation,
+    speed: f32
+}
+
+impl CameraController {
+    pub fn new(speed: f32) -> Self {
+        let rotation = CameraRotation { yaw: 0.0, pitch: 0.0, last_update: None };
+        Self { movement: CameraMovement::default(), rotation, speed }
+    }
+
+    pub fn handle_input(&mut self, event: &Event<()>) -> bool {
+        match event {
+            Event::WindowEvent { ref event, .. } => {
+                match event {
+                    WindowEvent::KeyboardInput { input: KeyboardInput { state, virtual_keycode: Some(keycode), .. }, .. } => {
+                        let is_pressed = *state == ElementState::Pressed;
+                        match keycode {
+                            VirtualKeyCode::Space => { self.movement.up = is_pressed; true }
+                            VirtualKeyCode::LShift => { self.movement.down = is_pressed; true }
+                            VirtualKeyCode::W | VirtualKeyCode::Up => { self.movement.fwd = is_pressed; true }
+                            VirtualKeyCode::A | VirtualKeyCode::Left => { self.movement.left = is_pressed; true }
+                            VirtualKeyCode::S | VirtualKeyCode::Down => { self.movement.back = is_pressed; true }
+                            VirtualKeyCode::D | VirtualKeyCode::Right => { self.movement.right = is_pressed; true }
+                            _ => false,
+                        }
+                    }
+                    _ => false
+                }
+            },
+            Event::DeviceEvent { device_id: _, event } => {
+                match event {
+                    DeviceEvent::MouseMotion { delta } => {
+                        if let Some(last_update) = self.rotation.last_update {
+                            let elapsed = last_update.elapsed().as_secs_f32();
+                            self.rotation.yaw += (delta.0 as f32) / elapsed;
+                            self.rotation.pitch += (delta.1 as f32) / elapsed;
+                        }
+                        self.rotation.last_update = Some(std::time::Instant::now());
+                        true
+                    }
+                    _ => false
+                }
+            }
+            _ => false
+        }
+    }
+
+    pub fn update_camera(&mut self, camera: &mut Camera, delta_time: f32) {
+
+        // Movement amount
+        let amount = delta_time * self.speed;
+ 
+        // Forward and backwards
+        if self.movement.fwd && camera.forward.magnitude() > amount { camera.position +=  camera.forward.normalize() * amount; }
+        if self.movement.back { camera.position -=  camera.forward.normalize() * amount; }
+
+        // Up and down
+        if self.movement.up { camera.position += camera.up.normalize() * amount; }
+        if self.movement.down { camera.position -= camera.up.normalize() * amount; }
+
+        // Left and right
+        let right = camera.forward.cross(camera.up);
+        if self.movement.right { camera.position += right * amount; }
+        if self.movement.left { camera.position -= right * amount; }
+
+        println!("Yaw: {}", self.rotation.yaw);
+    }
+}

src/main.rs

@@ -1,3 +1,4 @@
+use std::sync::Arc;
 use winit::{
     event::{Event, WindowEvent, KeyboardInput, ElementState, VirtualKeyCode},
     event_loop::{ControlFlow, EventLoop},
@@ -10,6 +11,7 @@ mod texture;
 mod uniforms;
 mod camera;
 mod app;
+mod camera_controller;
 use app::App;
 
 fn main() {
@@ -28,12 +30,20 @@ fn main() {
 
     let mut fps_timer = std::time::Instant::now();
     let mut fps_counter = 0;
+    let mut delta_timer = std::time::Instant::now();
 
     // Run event loop
     events.run(move |e, _, c| {
-        match e {
+        let ev = Arc::new(e);
+
+        if app.input(ev.clone()) {
+            // Event consumed
+            return;
+        }
+
+        match ev.as_ref() {
             // Window event
-            Event::WindowEvent { ref event, .. } => if !app.input(event) {
+            Event::WindowEvent { ref event, .. } => {
                 match event {
                     // Window closed
                     WindowEvent::CloseRequested => {
@@ -69,18 +79,20 @@ fn main() {
             Event::RedrawRequested(_) => {
 
                 // Display FPS
-                let elapsed = fps_timer.elapsed().as_millis();
-                if elapsed >= 1000 {
-                    let elapsed_sec = (elapsed as f32) / 1000.0;
-                    let fps = (fps_counter as f32) / elapsed_sec;
-                    println!("FPS: {}", fps);
+                let elapsed = fps_timer.elapsed().as_secs_f64();
+                if elapsed >= 0.5 {
+                    let fps = (fps_counter as f64) / elapsed;
+                    println!("FPS: {}", (fps*100.0_f64).floor()/100.0);
                     fps_timer = std::time::Instant::now();
                     fps_counter = 0;
                 }
                 fps_counter += 1;
                 
                 // Update and Render
-                app.update();
+                app.update(delta_timer.elapsed().as_secs_f32());
+                delta_timer = std::time::Instant::now();
+
+                // Render
                 match app.render() {
                     Ok(_) => { }
                     // Recreate the swap_chain if lost

src/texture.rs

@@ -47,7 +47,8 @@ impl Texture {
                 address_mode_u: wgpu::AddressMode::ClampToEdge,
                 address_mode_v: wgpu::AddressMode::ClampToEdge,
                 address_mode_w: wgpu::AddressMode::ClampToEdge,
-                mag_filter: wgpu::FilterMode::Linear,
+                //mag_filter: wgpu::FilterMode::Linear,
+                mag_filter: wgpu::FilterMode::Nearest,
                 min_filter: wgpu::FilterMode::Nearest,
                 mipmap_filter: wgpu::FilterMode::Nearest,
                 ..Default::default()