Implemented a pipeline and first shader

src/lib.rs

@@ -13,6 +13,7 @@ struct State {
     queue: wgpu::Queue,
     config: wgpu::SurfaceConfiguration,
     size: winit::dpi::PhysicalSize<u32>,
+    render_pipeline: wgpu::RenderPipeline,
     window: Window,
 }
 
@@ -74,12 +75,57 @@ impl State {
         };
         surface.configure(&device, &config);
 
+        let shader = device.create_shader_module(wgpu::include_wgsl!("shader.wgsl"));
+
+        let render_pipeline_layout = 
+        device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: Some("Render Pipeline Layout"),
+            bind_group_layouts: &[],
+            push_constant_ranges: &[],
+        });
+
+        let render_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some("Render Pipeline"),
+            layout: Some(&render_pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &shader,
+                entry_point: "vs_main",
+                buffers: &[],
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &shader,
+                entry_point: "fs_main",
+                targets: &[Some(wgpu::ColorTargetState {
+                    format: config.format,
+                    blend: Some(wgpu::BlendState::REPLACE),
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::TriangleList,
+                strip_index_format: None,
+                cull_mode: Some(wgpu::Face::Back),
+                polygon_mode: wgpu::PolygonMode::Fill,
+                unclipped_depth: false,
+                conservative: false, 
+                front_face: wgpu::FrontFace::Ccw,
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState {
+                count: 1,
+                mask: !0,
+                alpha_to_coverage_enabled: false,
+            },
+            multiview: None,
+        });
+
         Self {
             surface,
             device,
             queue,
             config,
             size,
+            render_pipeline,
             window,
         }
     }
@@ -118,18 +164,20 @@ impl State {
                 label: Some("Render Encoder"),
             });
 
-        let _render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+        let mut render_pass = 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(wgpu::Color {
-                        r: 0.1,
-                        g: 0.2,
-                        b: 0.3,
-                        a: 1.0,
-                    }),
+                    load: wgpu::LoadOp::Clear(
+                        wgpu::Color {
+                            r: 0.1,
+                            g: 0.2,
+                            b: 0.3,
+                            a: 1.0,
+                        }
+                    ),
                     store: wgpu::StoreOp::Store,
                 },
             })],
@@ -138,7 +186,10 @@ impl State {
             timestamp_writes: None,
         });
 
-        drop(_render_pass);
+        render_pass.set_pipeline(&self.render_pipeline);
+        render_pass.draw(0..3, 0..1);
+
+        drop(render_pass);
 
         self.queue.submit(std::iter::once(encoder.finish()));
         output.present();

src/shader.wgsl

@@ -0,0 +1,22 @@
+// Vertex shader
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+};
+
+@vertex
+fn vs_main(
+    @builtin(vertex_index) in_vertex_index: u32,
+) -> VertexOutput {
+    var out: VertexOutput;
+    let x = f32(1 - i32(in_vertex_index)) * 0.5;
+    let y = f32(i32(in_vertex_index & 1u) * 2 - 1) * 0.5;
+    out.clip_position = vec4<f32>(x, y, 0.0, 1.0);
+    return out;
+}
+
+// Fragment shader
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    return vec4<f32>(0.3, 0.2, 0.1, 1.0);
+}