1 files changed, 158 insertions, 0 deletions
diff --git a/client/src/renderer.rs b/client/src/renderer.rs
new file mode 100644
index 0000000..b21c139
--- /dev/null
+++ b/client/src/renderer.rs
@@ -0,0 +1,158 @@
+use anyhow::{Result, anyhow};
+use pollster::FutureExt;
+use wgpu::{
+    Backends, BindGroup, BindGroupDescriptor, BindGroupLayoutDescriptor, BlendState, Color,
+    ColorTargetState, ColorWrites, CommandEncoderDescriptor, Device, DeviceDescriptor, Features,
+    FragmentState, FrontFace, Instance, InstanceDescriptor, Limits, LoadOp, MaintainBase,
+    MultisampleState, Operations, PipelineCompilationOptions, PipelineLayoutDescriptor,
+    PolygonMode, PowerPreference, PrimitiveState, PrimitiveTopology, Queue,
+    RenderPassColorAttachment, RenderPassDescriptor, RenderPipeline, RenderPipelineDescriptor,
+    RequestAdapterOptions, StoreOp, Surface, SurfaceConfiguration, TextureViewDescriptor,
+    VertexState, include_wgsl,
+};
+use winit::window::Window;
+
+pub struct Renderer<'a> {
+    surface: Surface<'a>,
+    pipeline: RenderPipeline,
+    bind_group: BindGroup,
+    queue: Queue,
+    device: Device,
+    surface_configuration: SurfaceConfiguration,
+}
+impl<'a> Renderer<'a> {
+    pub fn new(window: &'a Window) -> Result<Self> {
+        let instance = Instance::new(InstanceDescriptor {
+            backends: Backends::all(),
+            ..Default::default()
+        });
+
+        let surface = instance.create_surface(window)?;
+        let adapter = instance
+            .request_adapter(&RequestAdapterOptions {
+                compatible_surface: Some(&surface),
+                power_preference: PowerPreference::HighPerformance,
+                ..Default::default()
+            })
+            .block_on()
+            .ok_or(anyhow!("no adapter found"))?;
+
+        let (device, queue) = adapter
+            .request_device(
+                &DeviceDescriptor {
+                    required_features: Features::default(),
+                    required_limits: Limits::downlevel_defaults(),
+                    ..Default::default()
+                },
+                None,
+            )
+            .block_on()?;
+
+        let surface_configuration = surface
+            .get_default_config(&adapter, 256, 256)
+            .ok_or(anyhow!("no default config"))?;
+
+        let module = device.create_shader_module(include_wgsl!("shader.wgsl"));
+
+        let bind_group_layout = device.create_bind_group_layout(&BindGroupLayoutDescriptor {
+            entries: &[],
+            label: None,
+        });
+        let bind_group = device.create_bind_group(&BindGroupDescriptor {
+            label: None,
+            layout: &bind_group_layout,
+            entries: &[],
+        });
+        let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
+            label: None,
+            bind_group_layouts: &[&bind_group_layout],
+            push_constant_ranges: &[],
+        });
+        let pipeline = device.create_render_pipeline(&RenderPipelineDescriptor {
+            label: None,
+            layout: Some(&pipeline_layout),
+            fragment: Some(FragmentState {
+                module: &module,
+                entry_point: Some("fs_main"),
+                targets: &[Some(ColorTargetState {
+                    blend: Some(BlendState::PREMULTIPLIED_ALPHA_BLENDING),
+                    format: surface_configuration.format,
+                    write_mask: ColorWrites::all(),
+                })],
+                compilation_options: PipelineCompilationOptions::default(),
+            }),
+            vertex: VertexState {
+                module: &module,
+                entry_point: Some("vs_main"),
+                buffers: &[],
+                compilation_options: PipelineCompilationOptions::default(),
+            },
+            primitive: PrimitiveState {
+                topology: PrimitiveTopology::TriangleList,
+                front_face: FrontFace::Ccw,
+                cull_mode: None, //Some(Face::Back),
+                polygon_mode: PolygonMode::Fill,
+                ..Default::default()
+            },
+            depth_stencil: Default::default(),
+            multisample: MultisampleState::default(),
+            multiview: None,
+            cache: None,
+        });
+
+        surface.configure(&device, &surface_configuration);
+
+        Ok(Self {
+            surface,
+            pipeline,
+            bind_group,
+            device,
+            queue,
+            surface_configuration,
+        })
+    }
+
+    pub fn resize(&mut self, width: u32, height: u32) {
+        self.surface_configuration.width = width;
+        self.surface_configuration.height = height;
+        self.surface
+            .configure(&self.device, &self.surface_configuration);
+    }
+
+    pub fn draw(&mut self) -> Result<()> {
+        let target = self.surface.get_current_texture()?;
+        let target_view = target
+            .texture
+            .create_view(&TextureViewDescriptor::default());
+
+        let mut commands = self
+            .device
+            .create_command_encoder(&CommandEncoderDescriptor { label: None });
+
+        {
+            let mut rpass = commands.begin_render_pass(&RenderPassDescriptor {
+                label: None,
+                color_attachments: &[Some(RenderPassColorAttachment {
+                    view: &target_view,
+                    resolve_target: None,
+                    ops: Operations {
+                        store: StoreOp::Store,
+                        load: LoadOp::Clear(Color::BLUE),
+                    },
+                })],
+                ..Default::default()
+            });
+
+            rpass.set_bind_group(0, &self.bind_group, &[]);
+            rpass.set_pipeline(&self.pipeline);
+            rpass.draw(0..3, 0..1);
+        }
+
+        let i = self.queue.submit(Some(commands.finish()));
+        self.device.poll(MaintainBase::WaitForSubmissionIndex(i));
+
+        target.present();
+
+        Ok(())
+    }
+}