Started implementing Wgpu renderer

+ implemented basic setup code
+ implemented basic resize code
! renderer will default to GLES backend due to NV prime (Wgpu bug)

Cargo.toml

@@ -9,4 +9,11 @@ edition = "2021"
 log = "^0.4.17"
 chrono = "^0.4.19"
 fern = { version = "^0.6.1", features = ["colored"] }
+bitflags = "^1.3.2"
+cgmath = "^0.18.0"
+pollster = "^0.2.5"
 
+winit = "^0.26.1"
+raw-window-handle = "^0.4.3"
+
+wgpu = "^0.13.0"

src/canvas.rs

@@ -8,7 +8,7 @@ use crate::{
     sprite::{Sprite, TextureSprite, TextSprite, ShapeSprite},
     texture::Texture,
     utils::{Size, Pixel, Position, Color},
-    renderer::Renderer,
+    renderer::WgpuRenderer,
 };
 
 use std::{
@@ -26,15 +26,16 @@ pub trait Application {
 
 //--Canvas struct-----------------------------------------------------------------------------------
 pub struct Canvas {
-    renderer: Renderer,
+    renderer: WgpuRenderer,
     clear_color: Pixel,
 }
 
 impl Canvas {
 
-    pub fn create<W: HasRawWindowHandle>(window: &W) -> Result<Canvas, &'static str> {
-
-        let renderer = Renderer::create(window)?;
+    pub async fn create<W: HasRawWindowHandle>(window: &W, size: Size) 
+        -> Result<Canvas, &'static str> 
+    {
+        let renderer = WgpuRenderer::create(window, size).await?;
 
         Ok(Self {
             renderer,
@@ -73,13 +74,17 @@ impl Canvas {
     //--Output functions--
     pub fn draw<S: Sprite>(&mut self, sprite: &S) {
         //update texture
-        self.renderer.draw(sprite);
+        self.renderer.render(sprite);
     }
 
     pub fn set_clear_color(&mut self, color: Pixel) {
         self.clear_color = color;
     }
 
+    pub fn set_size(&mut self, size: Size) {
+        self.renderer.resize(size);
+    }
+
     pub fn clear(&mut self) {
         self.renderer.clear(&self.clear_color);
     }
@@ -114,7 +119,7 @@ impl Canvas {
     }
 
     pub fn update(&mut self) {
-        self.renderer.finish_frame();
+        self.renderer.present();
     }
 }
 

src/lib.rs

@@ -1,6 +1,8 @@
 #[allow(unused_imports)]
 use log::{debug, error, info, trace, warn};
 
+use pollster::FutureExt;
+
 mod canvas;
 pub use canvas::Canvas;
 pub use canvas::Application;
@@ -29,8 +31,8 @@ pub fn run_canvas<A: 'static + Application>(title: &'static str, size: Size, mut
         .expect("Failed to create window");
 
     // construct canvas
-    let mut canvas = Canvas::create(&window)
-        .unwrap();
+    let size = window.inner_size();
+    let mut canvas = Canvas::create(&window, size.into()).block_on().unwrap();
 
     // init application
     app.init(&mut canvas).unwrap();
@@ -46,22 +48,32 @@ pub fn run_canvas<A: 'static + Application>(title: &'static str, size: Size, mut
 
         *control_flow = ControlFlow::Poll;
 
-        let _ = match event {
-            Event::WindowEvent {
-                event: WindowEvent::CloseRequested,
-                ..
-            } => {
+        match event {
+
+            Event::WindowEvent {event, ..} => match event {
+                WindowEvent::CloseRequested => {
                     info!("Close requested, shutting down...");
                     *control_flow = ControlFlow::Exit;
-                Ok(())
                 },
-            Event::MainEventsCleared => app.tick(&mut canvas),
+                WindowEvent::Resized (size) => {
+                    canvas.set_size(size.into());
+                },
+                WindowEvent::ScaleFactorChanged {new_inner_size, ..} => {
+                    // new_inner_size is &&mut so we have to dereference it twice
+                    canvas.set_size((*new_inner_size).into());
+                },
+                _ => (),
+            },
+
+            Event::MainEventsCleared => {
+                let _ = app.tick(&mut canvas);
+            },
             Event::RedrawRequested(_) => {
-                canvas.update();
-                Ok(())
+                let _ = canvas.update();
             },
-            _ => Ok(())
-        }.unwrap();
+            
+            _ => ()
+        };
     });
 }
 

src/main.rs

@@ -19,7 +19,7 @@ fn setup_logger() -> Result<(), fern::InitError> {
                 message
             ))
         })
-        .level(log::LevelFilter::Trace)
+        .level(log::LevelFilter::Debug)
         .chain(std::io::stdout())
         .chain(fern::log_file("output.log")?)
         .apply()?;

src/renderer.rs

@@ -0,0 +1,93 @@
+#[allow(unused_imports)]
+use log::{debug, error, info, trace, warn};
+
+use raw_window_handle::HasRawWindowHandle;
+use wgpu;
+
+use crate::{
+    sprite::Sprite,
+    utils::{Pixel,  Size},
+};
+
+//--Renderer struct---------------------------------------------------------------------------------
+pub struct WgpuRenderer {
+    surface: wgpu::Surface,
+    device: wgpu::Device,
+    queue: wgpu::Queue,
+    config: wgpu::SurfaceConfiguration,
+    size: Size,
+}
+
+impl WgpuRenderer {
+
+    pub async fn create<W: HasRawWindowHandle>(window: &W, size: Size) 
+        -> Result<Self, &'static str> 
+    {
+        if size.w == 0 || size.h == 0 {
+            return Err("window has zero as at least one of its dimensions");
+        }
+        let instance = wgpu::Instance::new(wgpu::Backends::all());
+        let surface = unsafe { instance.create_surface(window) };
+        
+        let adapter = instance.request_adapter(
+            &wgpu::RequestAdapterOptions {
+                //for now, integrated GPU is enough, may be revised later
+                power_preference: wgpu::PowerPreference::LowPower,
+                compatible_surface: Some(&surface),
+                force_fallback_adapter: false,
+            },
+        ).await.unwrap();
+
+        let (device, queue) = adapter.request_device(
+            &wgpu::DeviceDescriptor {
+                //using minimum requirements possible since 2D isn't very demanding anyway
+                features: wgpu::Features::empty(),
+                limits: wgpu::Limits::downlevel_webgl2_defaults(),
+                label: None,
+            },
+            None, // Trace path
+        ).await.unwrap();
+
+        let config = wgpu::SurfaceConfiguration {
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+            //first format in the list is preferred
+            format: *surface.get_supported_formats(&adapter).first()
+                .ok_or_else(|| { "Surface is incompatible with current adapter" })?,
+            width: size.w,
+            height: size.h,
+            present_mode: wgpu::PresentMode::Fifo,
+        };
+        surface.configure(&device, &config);
+
+        Ok(Self {
+            surface,
+            device,
+            queue,
+            config,
+            size, 
+        })
+    }
+
+    pub fn render<S: Sprite>(&mut self, _sprite: &S) {
+        unimplemented!();
+    }
+
+    pub fn resize(&mut self, size: Size) {
+        if size.w == 0 || size.h == 0 {
+            panic!("window has zero as at least one of its dimensions");
+        }
+        self.size = size;
+        self.config.width = size.w;
+        self.config.height = size.h;
+        self.surface.configure(&self.device, &self.config);
+    }
+
+    pub fn clear(&mut self, _color: &Pixel) {
+        unimplemented!();
+    }
+
+    pub fn present(&mut self) {
+        unimplemented!();
+    }
+}
+

src/utils.rs

@@ -10,6 +10,7 @@ pub struct Position {
 }
 
 //--Size struct-------------------------------------------------------------------------------------
+#[derive(Copy, Clone)]
 pub struct Size {
     pub w: u32,
     pub h: u32,
@@ -18,14 +19,24 @@ pub struct Size {
 impl From<Size> for winit::dpi::Size {
 
     fn from(size: Size) -> Self {
-        winit::dpi::Size::Logical (
-            winit::dpi::LogicalSize {
-                width: size.w.into(), 
-                height: size.h.into()
+        winit::dpi::Size::Physical (
+            winit::dpi::PhysicalSize {
+                width: size.w, 
+                height: size.h,
         })
     }
 }
 
+impl From<winit::dpi::PhysicalSize<u32>> for Size {
+
+    fn from(size: winit::dpi::PhysicalSize<u32>) -> Self {
+        Self {
+            w: size.width,
+            h: size.height,
+        }
+    }
+}
+
 //--Pixel struct------------------------------------------------------------------------------------
 #[derive(Copy, Clone)]
 struct Rgba {