Pipeline

src/main.rs

@@ -17,6 +17,10 @@ struct Renderer {
     surface: wgpu::Surface,
     queue: wgpu::Queue,
     config: wgpu::SurfaceConfiguration,
+    camera_uniform: CameraUniform,
+    camera_buffer: wgpu::Buffer,
+    camera_bind_group: wgpu::BindGroup,
+    render_pipeline: wgpu::RenderPipeline,
 }
 
 impl Renderer {
@@ -57,6 +61,85 @@ impl Renderer {
 
         let mesh_pool = MeshPool::default();
 
+        let camera_uniform = CameraUniform::new();
+
+        let camera_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+            label: Some("Camera Buffer"),
+            contents: bytemuck::cast_slice(&[camera_uniform]),
+            usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+        });
+
+        let camera_bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                entries: &[wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::VERTEX,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }],
+                label: Some("Camera Bind Group Layout"),
+            });
+
+        let camera_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            layout: &camera_bind_group_layout,
+            entries: &[wgpu::BindGroupEntry {
+                binding: 0,
+                resource: camera_buffer.as_entire_binding(),
+            }],
+            label: Some("Camera Bind Group"),
+        });
+
+        let render_pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: Some("Render Pipeline Layout"),
+                bind_group_layouts: &[&camera_bind_group_layout],
+                push_constant_ranges: &[],
+            });
+
+        let shader = device.create_shader_module(&wgpu::ShaderModuleDescriptor {
+            label: Some("Shader"),
+            source: wgpu::ShaderSource::Wgsl(include_str!("shader.wgsl").into()),
+        });
+
+        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: &[Vertex::desc()],
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &shader,
+                entry_point: "fs_main",
+                targets: &[wgpu::ColorTargetState {
+                    format: config.format,
+                    blend: Some(wgpu::BlendState::REPLACE),
+                    write_mask: wgpu::ColorWrites::ALL,
+                }],
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::LineList,
+                strip_index_format: None,
+                front_face: wgpu::FrontFace::Ccw,
+                cull_mode: None,
+                polygon_mode: wgpu::PolygonMode::Fill,
+                unclipped_depth: false,
+                conservative: false,
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState {
+                count: 1,
+                mask: !0,
+                alpha_to_coverage_enabled: false,
+            },
+            multiview: None,
+        });
+
         Self {
             size,
             surface,
@@ -64,6 +147,10 @@ impl Renderer {
             queue,
             config,
             mesh_pool,
+            camera_uniform,
+            camera_buffer,
+            camera_bind_group,
+            render_pipeline,
         }
     }
 
@@ -81,6 +168,39 @@ impl Renderer {
         camera: &impl Camera,
         meshes: &MeshCommands,
     ) -> 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 mut _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,
+            });
+        }
+
+        self.queue.submit(std::iter::once(encoder.finish()));
+        output.present();
+
         Ok(())
     }
 }
@@ -137,12 +257,38 @@ struct CameraUniform {
     vp: [[f32; 4]; 4],
 }
 
+impl CameraUniform {
+    pub fn new() -> Self {
+        Self {
+            vp: glam::Mat4::IDENTITY.to_cols_array_2d(),
+        }
+    }
+
+    pub fn update(&mut self, camera: &impl Camera) {
+        self.vp = camera.get_vp();
+    }
+}
+
 #[repr(C)]
 #[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
 struct Vertex {
     position: [f32; 3],
 }
 
+impl Vertex {
+    pub fn desc<'a>() -> wgpu::VertexBufferLayout<'a> {
+        wgpu::VertexBufferLayout {
+            array_stride: std::mem::size_of::<Vertex>() as wgpu::BufferAddress,
+            step_mode: wgpu::VertexStepMode::Vertex,
+            attributes: &[wgpu::VertexAttribute {
+                offset: 0,
+                shader_location: 0,
+                format: wgpu::VertexFormat::Float32x3,
+            }],
+        }
+    }
+}
+
 type Index = u32;
 
 struct MeshData {

src/shader.wgsl

@@ -0,0 +1,30 @@
+struct CameraUniform {
+  vp: mat4x4<f32>;
+};
+
+[[group(0), binding(0)]]
+var<uniform> camera: CameraUniform;
+
+struct VertexInput {
+  [[location(0)]] position: vec3<f32>;
+};
+
+struct VertexOutput {
+  [[builtin(position)]] clip_position: vec4<f32>;
+};
+
+[[stage(vertex)]]
+fn vs_main(
+  vertex: VertexInput
+) -> VertexOutput {
+  var out: VertexOutput;
+  out.clip_position = camera.vp * vec4<f32>(vertex.position, 1.0);
+  return out;
+}
+
+[[stage(fragment)]]
+fn fs_main(
+  frag: VertexOutput,
+) -> [[location(0)]] vec4<f32> {
+  return vec4<f32>(1.0);
+}