Create RenderContext and Renderer structs

src/renderer.rs

@@ -0,0 +1,150 @@
+use winit::{dpi::PhysicalSize, window::Window};
+
+pub(crate) struct RenderContext {
+    pub instance: wgpu::Instance,
+    pub size: PhysicalSize<u32>,
+    pub surface: wgpu::Surface,
+    pub surface_config: wgpu::SurfaceConfiguration,
+    pub adapter: wgpu::Adapter,
+    pub device: wgpu::Device,
+    pub queue: wgpu::Queue,
+}
+
+impl RenderContext {
+    pub async fn new(window: &Window) -> Self {
+        log::info!("Initialising WGPU context...");
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: wgpu::Backends::VULKAN,
+            dx12_shader_compiler: Default::default(),
+        });
+
+        // To be able to start drawing we need a few things:
+        // - A surface
+        // - A GPU device to draw to the surface
+        // - A draw command queue
+        log::info!("Initialising window surface...");
+        let surface = unsafe { instance.create_surface(&window) }.unwrap();
+
+        log::info!("Requesting GPU adapter...");
+        let adapter = instance
+            .request_adapter(&wgpu::RequestAdapterOptions {
+                power_preference: wgpu::PowerPreference::HighPerformance,
+                force_fallback_adapter: false,
+                compatible_surface: Some(&surface),
+            })
+            .await
+            .unwrap();
+
+        log::info!("Checking GPU adapter meets requirements");
+        log::info!("Requesting GPU device...");
+        let (device, queue) = adapter
+            .request_device(
+                &wgpu::DeviceDescriptor {
+                    label: None,
+                    features: wgpu::Features::empty(),
+                    limits: wgpu::Limits::default(),
+                },
+                None,
+            )
+            .await
+            .unwrap();
+
+        log::info!("Configuring window surface...");
+        let size = window.inner_size();
+        let surface_config = surface
+            .get_default_config(&adapter, size.width, size.height)
+            .unwrap();
+        surface.configure(&device, &surface_config);
+
+        Self {
+            instance,
+            size,
+            surface,
+            surface_config,
+            adapter,
+            device,
+            queue,
+        }
+    }
+}
+
+pub(crate) struct Renderer {
+    clear_color: wgpu::Color,
+    render_pipeline: wgpu::RenderPipeline,
+}
+
+impl Renderer {
+    pub fn new(context: &RenderContext) -> Self {
+        log::info!("Creating render shader...");
+        let shader_descriptor = wgpu::include_wgsl!("../assets/shaders/shader.wgsl");
+        let shader = context.device.create_shader_module(shader_descriptor);
+
+        log::info!("Creating render pipeline...");
+        let render_pipeline =
+            context
+                .device
+                .create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+                    label: None,
+                    layout: Some(&context.device.create_pipeline_layout(
+                        &wgpu::PipelineLayoutDescriptor {
+                            label: Some("draw"),
+                            bind_group_layouts: &[],
+                            push_constant_ranges: &[],
+                        },
+                    )),
+                    vertex: wgpu::VertexState {
+                        module: &shader,
+                        entry_point: "vertex",
+                        buffers: &[],
+                    },
+                    fragment: Some(wgpu::FragmentState {
+                        module: &shader,
+                        entry_point: "fragment",
+                        targets: &[Some(context.surface_config.format.into())],
+                    }),
+                    primitive: wgpu::PrimitiveState::default(),
+                    depth_stencil: None,
+                    multisample: wgpu::MultisampleState::default(),
+                    multiview: None,
+                });
+
+        let clear_color = wgpu::Color {
+            r: 255.0 / 255.0,
+            g: 216.0 / 255.0,
+            b: 102.0 / 255.0,
+            a: 1.0,
+        };
+
+        Self {
+            clear_color,
+            render_pipeline,
+        }
+    }
+
+    pub fn render(&mut self, context: &RenderContext) {
+        let frame = context.surface.get_current_texture().unwrap();
+        let view = frame
+            .texture
+            .create_view(&wgpu::TextureViewDescriptor::default());
+
+        let mut encoder = context
+            .device
+            .create_command_encoder(&wgpu::CommandEncoderDescriptor::default());
+
+        encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: Some("Render Pass"),
+            color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                view: &view,
+                resolve_target: None,
+                ops: wgpu::Operations {
+                    load: wgpu::LoadOp::Clear(self.clear_color),
+                    store: true,
+                },
+            })],
+            depth_stencil_attachment: None,
+        });
+
+        context.queue.submit(Some(encoder.finish()));
+        frame.present();
+    }
+}