[TUTO] Finish learn gpu

engine_core/src/state.rs

@@ -0,0 +1,121 @@
+use winit::{window::Window, event::WindowEvent};
+
+pub struct State {
+    pub surface: wgpu::Surface,
+    pub device: wgpu::Device,
+    pub queue: wgpu::Queue,
+    pub config: wgpu::SurfaceConfiguration,
+    pub size: winit::dpi::PhysicalSize<u32>,
+}
+
+impl State {
+    // Creating some of the wgpu types requires async code
+    pub async fn new(window: &Window) -> Self {
+        let size = window.inner_size();
+
+        // The instance is a handle to our GPU
+        // Backends::all => Vulkan + Metal + DX12 + Browser WebGPU
+        let instance = wgpu::Instance::new(wgpu::Backends::all());
+        let surface = unsafe { instance.create_surface(window) };
+        let adapter = instance.request_adapter(
+            &wgpu::RequestAdapterOptions {
+                power_preference: wgpu::PowerPreference::default(),
+                compatible_surface: Some(&surface),
+                force_fallback_adapter: false,
+            },
+        ).await.unwrap();
+
+        // let adapter = instance
+        //     .enumerate_adapters(wgpu::Backends::all())
+        //     .filter(|adapter| {
+        //         // Check if this adapter supports our surface
+        //         surface.get_preferred_format(&adapter).is_some()
+        //     })
+        //     .next()
+        //     .unwrap();
+
+        
+        let (device, queue) = adapter.request_device(
+            &wgpu::DeviceDescriptor {
+                features: wgpu::Features::empty(),
+                // WebGL doesn't support all of wgpu's features, so if
+                // we're building for the web we'll have to disable some.
+                limits: if cfg!(target_arch = "wasm32") {
+                    wgpu::Limits::downlevel_webgl2_defaults()
+                } else {
+                    wgpu::Limits::default()
+                },
+                label: None,
+            },
+            None, // Trace path
+        ).await.unwrap();
+
+        let config = wgpu::SurfaceConfiguration {
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+            format: surface.get_preferred_format(&adapter).unwrap(),
+            width: size.width,
+            height: size.height,
+            present_mode: wgpu::PresentMode::Fifo,
+        };
+        surface.configure(&device, &config);
+
+        Self {
+            surface,
+            device,
+            queue,
+            config,
+            size,
+        }
+    }
+
+    pub fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
+        if new_size.width > 0 && new_size.height > 0 {
+            self.size = new_size;
+            self.config.width = new_size.width;
+            self.config.height = new_size.height;
+            self.surface.configure(&self.device, &self.config);
+        }
+    }
+
+    pub fn input(&mut self, event: &WindowEvent) -> bool {
+        false
+    }
+
+    pub fn update(&mut self) {
+        
+    }
+
+    pub fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
+        let output = self.surface.get_current_texture()?;
+        let view = output.texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let mut encoder = self.device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+            label: Some("Render Encoder"),
+        });
+    
+        {
+            let _render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                label: Some("Render Pass"),
+                color_attachments: &[wgpu::RenderPassColorAttachment {
+                    view: &view,
+                    resolve_target: None,
+                    ops: wgpu::Operations {
+                        load: wgpu::LoadOp::Clear(wgpu::Color {
+                            r: 0.1,
+                            g: 0.2,
+                            b: 0.3,
+                            a: 1.0,
+                        }),
+                        store: true,
+                    },
+                }],
+                depth_stencil_attachment: None,
+            });
+        }
+    
+        // submit will accept anything that implements IntoIter
+        self.queue.submit(std::iter::once(encoder.finish()));
+        output.present();
+    
+        Ok(())
+    }
+}