Add a camera which is not used yet

Cargo.lock

@@ -200,6 +200,16 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fd16c4719339c4530435d38e511904438d07cce7950afa3718a84ac36c10e89e"
 
+[[package]]
+name = "cgmath"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a98d30140e3296250832bbaaff83b27dcd6fa3cc70fb6f1f3e5c9c0023b5317"
+dependencies = [
+ "approx",
+ "num-traits",
+]
+
 [[package]]
 name = "clap"
 version = "2.33.3"
@@ -1168,6 +1178,7 @@ name = "mapr"
 version = "0.1.0"
 dependencies = [
  "bytemuck",
+ "cgmath",
  "console_error_panic_hook",
  "console_log",
  "criterion",

Cargo.toml

@@ -28,6 +28,7 @@ geo = "0.18.0"
 geo-types = "0.7"
 # proj = "0.24" FIXME: Incompatible with wasm
 # mbutiles = "0.1.1" FIXME: Incompatible with wasm
+cgmath = "0.18"
 
 # Rendering
 winit = { version = "0.25" }

src/main.rs

@@ -23,13 +23,20 @@ async fn setup(window: Window, event_loop: EventLoop<()>) {
     // Important: This kick-starts the rendering loop
     // window.request_redraw();
 
+    let mut last_render_time = std::time::Instant::now();
+
     event_loop.run(move |event, _, control_flow| {
         match event {
+            Event::DeviceEvent {
+                ref event,
+                .. // We're not using device_id currently
+            } => {
+                state.input(event);
+            }
             Event::WindowEvent {
                 ref event,
                 window_id,
             } if window_id == window.id() => {
-                if !state.input(event) {
                     match event {
                         WindowEvent::CloseRequested
                         | WindowEvent::KeyboardInput {
@@ -50,10 +57,13 @@ async fn setup(window: Window, event_loop: EventLoop<()>) {
                         }
                         _ => {}
                     }
-                }
+
             }
             Event::RedrawRequested(_) => {
-                state.update();
+                let now = std::time::Instant::now();
+                let dt = now - last_render_time;
+                last_render_time = now;
+                state.update(dt);
                 match state.render() {
                     Ok(_) => {}
                     // Reconfigure the surface if lost

src/render/camera.rs

@@ -0,0 +1,234 @@
+use std::f32::consts::FRAC_PI_2;
+
+use cgmath::prelude::*;
+
+#[rustfmt::skip]
+pub const OPENGL_TO_WGPU_MATRIX: cgmath::Matrix4<f32> = cgmath::Matrix4::new(
+    1.0, 0.0, 0.0, 0.0,
+    0.0, 1.0, 0.0, 0.0,
+    0.0, 0.0, 0.5, 0.0,
+    0.0, 0.0, 0.5, 1.0,
+);
+
+const SAFE_FRAC_PI_2: f32 = FRAC_PI_2 - 0.0001;
+
+#[derive(Debug)]
+pub struct Camera {
+    pub position: cgmath::Point3<f32>,
+    yaw: cgmath::Rad<f32>,
+    pitch: cgmath::Rad<f32>,
+}
+
+impl Camera {
+    pub fn new<
+        V: Into<cgmath::Point3<f32>>,
+        Y: Into<cgmath::Rad<f32>>,
+        P: Into<cgmath::Rad<f32>>,
+    >(
+        position: V,
+        yaw: Y,
+        pitch: P,
+    ) -> Self {
+        Self {
+            position: position.into(),
+            yaw: yaw.into(),
+            pitch: pitch.into(),
+        }
+    }
+
+    pub fn calc_matrix(&self) -> cgmath::Matrix4<f32> {
+        cgmath::Matrix4::look_to_rh(
+            self.position,
+            cgmath::Vector3::new(self.yaw.0.cos(), self.pitch.0.sin(), self.yaw.0.sin())
+                .normalize(),
+            cgmath::Vector3::unit_y(),
+        )
+    }
+}
+
+pub struct Projection {
+    aspect: f32,
+    fovy: cgmath::Rad<f32>,
+    znear: f32,
+    zfar: f32,
+}
+
+impl Projection {
+    pub fn new<F: Into<cgmath::Rad<f32>>>(
+        width: u32,
+        height: u32,
+        fovy: F,
+        znear: f32,
+        zfar: f32,
+    ) -> Self {
+        Self {
+            aspect: width as f32 / height as f32,
+            fovy: fovy.into(),
+            znear,
+            zfar,
+        }
+    }
+
+    pub fn resize(&mut self, width: u32, height: u32) {
+        self.aspect = width as f32 / height as f32;
+    }
+
+    pub fn calc_matrix(&self) -> cgmath::Matrix4<f32> {
+        OPENGL_TO_WGPU_MATRIX * cgmath::perspective(self.fovy, self.aspect, self.znear, self.zfar)
+    }
+}
+
+#[derive(Debug)]
+pub struct CameraController {
+    amount_left: f32,
+    amount_right: f32,
+    amount_forward: f32,
+    amount_backward: f32,
+    amount_up: f32,
+    amount_down: f32,
+    rotate_horizontal: f32,
+    rotate_vertical: f32,
+    scroll: f32,
+    speed: f32,
+    sensitivity: f32,
+}
+
+impl CameraController {
+    pub fn new(speed: f32, sensitivity: f32) -> Self {
+        Self {
+            amount_left: 0.0,
+            amount_right: 0.0,
+            amount_forward: 0.0,
+            amount_backward: 0.0,
+            amount_up: 0.0,
+            amount_down: 0.0,
+            rotate_horizontal: 0.0,
+            rotate_vertical: 0.0,
+            scroll: 0.0,
+            speed,
+            sensitivity,
+        }
+    }
+
+    pub fn process_keyboard(
+        &mut self,
+        key: winit::event::VirtualKeyCode,
+        state: winit::event::ElementState,
+    ) -> bool {
+        let amount = if state == winit::event::ElementState::Pressed {
+            1.0
+        } else {
+            0.0
+        };
+        match key {
+            winit::event::VirtualKeyCode::W | winit::event::VirtualKeyCode::Up => {
+                self.amount_forward = amount;
+                true
+            }
+            winit::event::VirtualKeyCode::S | winit::event::VirtualKeyCode::Down => {
+                self.amount_backward = amount;
+                true
+            }
+            winit::event::VirtualKeyCode::A | winit::event::VirtualKeyCode::Left => {
+                self.amount_left = amount;
+                true
+            }
+            winit::event::VirtualKeyCode::D | winit::event::VirtualKeyCode::Right => {
+                self.amount_right = amount;
+                true
+            }
+            winit::event::VirtualKeyCode::Space => {
+                self.amount_up = amount;
+                true
+            }
+            winit::event::VirtualKeyCode::LShift => {
+                self.amount_down = amount;
+                true
+            }
+            _ => false,
+        }
+    }
+
+    pub fn process_mouse(&mut self, mouse_dx: f64, mouse_dy: f64) {
+        self.rotate_horizontal = mouse_dx as f32;
+        self.rotate_vertical = mouse_dy as f32;
+    }
+
+    pub fn process_scroll(&mut self, delta: &winit::event::MouseScrollDelta) {
+        self.scroll = -match delta {
+            // I'm assuming a line is about 100 pixels
+            winit::event::MouseScrollDelta::LineDelta(_, scroll) => scroll * 100.0,
+            winit::event::MouseScrollDelta::PixelDelta(winit::dpi::PhysicalPosition {
+                y: scroll,
+                ..
+            }) => *scroll as f32,
+        };
+    }
+
+    pub fn update_camera(&mut self, camera: &mut Camera, dt: std::time::Duration) {
+        let dt = dt.as_secs_f32();
+
+        // Move forward/backward and left/right
+        let (yaw_sin, yaw_cos) = camera.yaw.0.sin_cos();
+        let forward = cgmath::Vector3::new(yaw_cos, 0.0, yaw_sin).normalize();
+        let right = cgmath::Vector3::new(-yaw_sin, 0.0, yaw_cos).normalize();
+        camera.position += forward * (self.amount_forward - self.amount_backward) * self.speed * dt;
+        camera.position += right * (self.amount_right - self.amount_left) * self.speed * dt;
+
+        // Move in/out (aka. "zoom")
+        // Note: this isn't an actual zoom. The camera's position
+        // changes when zooming. I've added this to make it easier
+        // to get closer to an object you want to focus on.
+        let (pitch_sin, pitch_cos) = camera.pitch.0.sin_cos();
+        let scrollward =
+            cgmath::Vector3::new(pitch_cos * yaw_cos, pitch_sin, pitch_cos * yaw_sin).normalize();
+        camera.position += scrollward * self.scroll * self.speed * self.sensitivity * dt;
+        self.scroll = 0.0;
+
+        // Move up/down. Since we don't use roll, we can just
+        // modify the y coordinate directly.
+        camera.position.y += (self.amount_up - self.amount_down) * self.speed * dt;
+
+        // Rotate
+        camera.yaw += cgmath::Rad(self.rotate_horizontal) * self.sensitivity * dt;
+        camera.pitch += cgmath::Rad(-self.rotate_vertical) * self.sensitivity * dt;
+
+        // If process_mouse isn't called every frame, these values
+        // will not get set to zero, and the camera will rotate
+        // when moving in a non cardinal direction.
+        self.rotate_horizontal = 0.0;
+        self.rotate_vertical = 0.0;
+
+        // Keep the camera's angle from going too high/low.
+        if camera.pitch < -cgmath::Rad(SAFE_FRAC_PI_2) {
+            camera.pitch = -cgmath::Rad(SAFE_FRAC_PI_2);
+        } else if camera.pitch > cgmath::Rad(SAFE_FRAC_PI_2) {
+            camera.pitch = cgmath::Rad(SAFE_FRAC_PI_2);
+        }
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct CameraUniform {
+    pub view_position: [f32; 4],
+    pub view_proj: [[f32; 4]; 4],
+}
+
+unsafe impl bytemuck::Pod for CameraUniform {}
+unsafe impl bytemuck::Zeroable for CameraUniform {}
+
+impl CameraUniform {
+    pub fn new() -> Self {
+        Self {
+            view_position: [0.0; 4],
+            view_proj: cgmath::Matrix4::identity().into(),
+        }
+    }
+
+    // UPDATED!
+    pub(crate) fn update_view_proj(&mut self, camera: &Camera, projection: &Projection) {
+        self.view_position = camera.position.to_homogeneous().into();
+        self.view_proj = (projection.calc_matrix() * camera.calc_matrix()).into()
+    }
+}

src/render/mod.rs

@@ -4,5 +4,6 @@ mod shader_ffi;
 mod tesselation;
 mod texture;
 mod platform_constants;
+mod camera;
 
-pub mod state;
+pub mod state;

src/render/shader_ffi.rs

@@ -1,23 +1,41 @@
+use crate::render::camera;
+use crate::render::camera::Camera;
+
 type Vec2f32 = [f32; 2];
 type Vec4f32 = [f32; 4];
+type Mat4f32 = [Vec4f32; 4];
 
 #[repr(C)]
 #[derive(Copy, Clone)]
 pub struct Globals {
-    pub resolution: Vec2f32,
-    pub scroll_offset: Vec2f32,
-    pub zoom: f32,
-    _pad1: u32, // _padX aligns it to 8 bytes = AlignOf(Vec2f32=vec2<f32>):
-                // https://gpuweb.github.io/gpuweb/wgsl/#alignment-and-size
+    pub view_proj: Mat4f32, // 64 bytes
+    pub view_position: Vec4f32, // 16 bytes
+    pub resolution: Vec2f32, // 8 bytes
+    pub scroll_offset: Vec2f32, // 8 bytes
+    pub zoom: f32, // 4 bytes
+    _pad1: i32, // _padX aligns it to 8 bytes = AlignOf(Vec2f32=vec2<f32>):
+    // https://gpuweb.github.io/gpuweb/wgsl/#alignment-and-size
+    _pad2: i32,
+    _pad3: i32,
 }
 
 impl Globals {
-    pub fn new(resolution: Vec2f32, scroll_offset: Vec2f32, zoom: f32) -> Self {
+    pub fn new(
+        view_proj: Mat4f32,
+        view_position: Vec4f32,
+        resolution: Vec2f32,
+        scroll_offset: Vec2f32,
+        zoom: f32,
+    ) -> Self {
         Self {
+            view_proj,
+            view_position,
             resolution,
             scroll_offset,
             zoom,
             _pad1: Default::default(),
+            _pad2: Default::default(),
+            _pad3: Default::default(),
         }
     }
 }
@@ -31,7 +49,7 @@ pub struct GpuVertex {
     pub position: Vec2f32,
     pub normal: Vec2f32,
     pub prim_id: u32,
-    _pad1: u32, // _padX aligns it to 8 bytes = AlignOf(Vec2f32=vec2<f32>):
+    _pad1: i32, // _padX aligns it to 8 bytes = AlignOf(Vec2f32=vec2<f32>):
                 // https://gpuweb.github.io/gpuweb/wgsl/#alignment-and-size
 }
 
@@ -41,7 +59,7 @@ impl GpuVertex {
             position,
             normal,
             prim_id,
-            _pad1: Default::default(),
+            _pad1: Default::default()
         }
     }
 }
@@ -58,8 +76,8 @@ pub struct Primitive {
     pub width: f32,
     pub angle: f32,
     pub scale: f32,
-    _pad1: u32, // _padX aligns it to 16 bytes = AlignOf(Vec4f32/vec4<f32>):
-    _pad2: u32, // https://gpuweb.github.io/gpuweb/wgsl/#alignment-and-size
+    _pad1: i32, // _padX aligns it to 16 bytes = AlignOf(Vec4f32/vec4<f32>):
+    _pad2: i32, // https://gpuweb.github.io/gpuweb/wgsl/#alignment-and-size
 }
 
 impl Default for Primitive {
@@ -91,12 +109,3 @@ impl Primitive {
 
 unsafe impl bytemuck::Pod for Primitive {}
 unsafe impl bytemuck::Zeroable for Primitive {}
-
-#[repr(C)]
-#[derive(Copy, Clone)]
-pub struct BgPoint {
-    pub point: [f32; 2],
-}
-
-unsafe impl bytemuck::Pod for BgPoint {}
-unsafe impl bytemuck::Zeroable for BgPoint {}

src/render/shaders/vertex.wgsl

@@ -1,8 +1,13 @@
 [[block]]
 struct Globals {
+    view_position: vec4<f32>;
+    view_proj: mat4x4<f32>;
     resolution: vec2<f32>;
     scroll_offset: vec2<f32>;
     zoom: f32;
+    pad1: i32;
+    pad2: i32;
+    pad3: i32;
 };
 
 struct Primitive {

src/render/state.rs

@@ -6,10 +6,11 @@ use lyon::math::Vector;
 use lyon::tessellation::VertexBuffers;
 use vector_tile::parse_tile_reader;
 use wgpu::util::DeviceExt;
-use winit::event::{ElementState, KeyboardInput, VirtualKeyCode, WindowEvent};
+use winit::event::{DeviceEvent, ElementState, KeyboardInput, VirtualKeyCode, WindowEvent};
 use winit::window::Window;
 
 use crate::fps_meter::FPSMeter;
+use crate::render::camera;
 use crate::render::tesselation::TileMask;
 
 use super::piplines::*;
@@ -79,6 +80,11 @@ pub struct State {
     tile_mask_indices_uniform_buffer: wgpu::Buffer,
     tile_mask_range: Range<u32>,
 
+    camera: camera::Camera,                      // UPDATED!
+    projection: camera::Projection,              // NEW!
+    camera_controller: camera::CameraController, // UPDATED!
+    camera_uniform: camera::CameraUniform,       // UPDATED!
+
     scene: SceneParams,
 }
 
@@ -333,6 +339,19 @@ impl State {
             None
         };
 
+        let camera = camera::Camera::new((0.0, 5.0, 10.0), cgmath::Deg(-90.0), cgmath::Deg(-20.0));
+        let projection = camera::Projection::new(
+            surface_config.width,
+            surface_config.height,
+            cgmath::Deg(45.0),
+            0.1,
+            100.0,
+        );
+        let camera_controller = camera::CameraController::new(4.0, 0.4);
+        let mut camera_uniform = camera::CameraUniform::new();
+
+        camera_uniform.update_view_proj(&camera, &projection);
+
         Self {
             surface,
             device,
@@ -356,6 +375,10 @@ impl State {
             tile_stroke_range,
             tile_mask_indices_uniform_buffer,
             tile_mask_range,
+            camera,
+            projection,
+            camera_controller,
+            camera_uniform,
         }
     }
 
@@ -366,6 +389,8 @@ impl State {
             self.surface_config.height = new_size.height;
             self.surface.configure(&self.device, &self.surface_config);
 
+            self.projection.resize(new_size.width, new_size.height);
+
             // Re-configure depth buffer
             self.depth_texture = Texture::create_depth_texture(
                 &self.device,
@@ -387,23 +412,21 @@ impl State {
         }
     }
 
-    pub fn input(&mut self, event: &WindowEvent) -> bool {
+    pub fn input(&mut self, event: &DeviceEvent) -> bool {
         let scene = &mut self.scene;
-        let found = match event {
-            WindowEvent::KeyboardInput {
-                input:
-                    KeyboardInput {
-                        state: ElementState::Pressed,
-                        virtual_keycode: Some(key),
-                        ..
-                    },
+        match event {
+            DeviceEvent::Key(KeyboardInput {
+                virtual_keycode: Some(key),
+                state,
                 ..
-            } => match key {
+            }) => match key {
                 VirtualKeyCode::PageDown => {
+                    println!("PageDown");
                     scene.target_zoom *= 0.8;
                     true
                 }
                 VirtualKeyCode::PageUp => {
+                    println!("PageUp");
                     scene.target_zoom *= 1.25;
                     true
                 }
@@ -431,12 +454,27 @@ impl State {
                     scene.target_stroke_width *= 0.8;
                     true
                 }
-                _key => false,
+                _key => self.camera_controller.process_keyboard(*key, *state),
             },
-            _evt => false,
-        };
-
-        found
+            DeviceEvent::MouseWheel { delta, .. } => {
+                self.camera_controller.process_scroll(delta);
+                true
+            }
+            DeviceEvent::Button {
+                button: 1, // Left Mouse Button
+                state,
+            } => {
+                //self.mouse_pressed = *state == ElementState::Pressed;
+                true
+            }
+            DeviceEvent::MouseMotion { delta } => {
+                //if self.mouse_pressed {
+                //    self.camera_controller.process_mouse(delta.0, delta.1);
+                //}
+                true
+            }
+            _ => false,
+        }
     }
 
     pub fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
@@ -451,6 +489,8 @@ impl State {
                 &self.globals_uniform_buffer,
                 0,
                 bytemuck::cast_slice(&[Globals::new(
+                    self.camera_uniform.view_proj,
+                    self.camera_uniform.view_position,
                     [self.size.width as f32, self.size.height as f32],
                     scene.scroll.to_array(),
                     scene.zoom,
@@ -539,10 +579,14 @@ impl State {
         Ok(())
     }
 
-    pub fn update(&mut self) {
+    pub fn update(&mut self, dt: std::time::Duration) {
         let scene = &mut self.scene;
         let time_secs = self.fps_meter.time_secs as f32;
 
+        self.camera_controller.update_camera(&mut self.camera, dt);
+        self.camera_uniform
+            .update_view_proj(&self.camera, &self.projection);
+
         // Animate the zoom to match target_zoom
         scene.zoom += (scene.target_zoom - scene.zoom) / 3.0;
         scene.scroll = scene.scroll + (scene.target_scroll - scene.scroll) / 3.0;