From 0353b30889b4876fd8c069a36377c53e9a37b458 Mon Sep 17 00:00:00 2001
From: Jonathan Flueren <jonathan.flueren@tu-dortmund.de>
Date: Thu, 16 Mar 2023 18:04:35 +0100
Subject: [PATCH] Add wgsl

---
 src/main.rs     | 58 +++++++++++++++++++++++++++++++++++++++++++++++--
 src/shader.wgsl | 27 +++++++++++++++++++++++
 2 files changed, 83 insertions(+), 2 deletions(-)
 create mode 100644 src/shader.wgsl

diff --git a/src/main.rs b/src/main.rs
index 0578814..eeac73c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,6 +16,7 @@ struct State {
     queue: wgpu::Queue,
     config: wgpu::SurfaceConfiguration,
     size: winit::dpi::PhysicalSize<u32>,
+    render_pipeline: wgpu::RenderPipeline,
     window: Window,
 }
 
@@ -63,6 +64,55 @@ 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", // 1.
+                buffers: &[],           // 2.
+            },
+            fragment: Some(wgpu::FragmentState {
+                // 3.
+                module: &shader,
+                entry_point: "fs_main",
+                targets: &[Some(wgpu::ColorTargetState {
+                    // 4.
+                    format: config.format,
+                    blend: Some(wgpu::BlendState::REPLACE),
+                    write_mask: wgpu::ColorWrites::ALL,
+                })],
+            }),
+            primitive: wgpu::PrimitiveState {
+                topology: wgpu::PrimitiveTopology::TriangleList, // 1.
+                strip_index_format: None,
+                front_face: wgpu::FrontFace::Ccw, // 2.
+                cull_mode: Some(wgpu::Face::Back),
+                // Setting this to anything other than Fill requires Features::NON_FILL_POLYGON_MODE
+                polygon_mode: wgpu::PolygonMode::Fill,
+                // Requires Features::DEPTH_CLIP_CONTROL
+                unclipped_depth: false,
+                // Requires Features::CONSERVATIVE_RASTERIZATION
+                conservative: false,
+            },
+            depth_stencil: None, // 1.
+            multisample: wgpu::MultisampleState {
+                count: 1,                         // 2.
+                mask: !0,                         // 3.
+                alpha_to_coverage_enabled: false, // 4.
+            },
+            multiview: None, // 5.
+        });
+
         Self {
             window,
             surface,
@@ -70,6 +120,7 @@ impl State {
             queue,
             config,
             size,
+            render_pipeline,
         }
     }
 
@@ -102,7 +153,7 @@ impl State {
             });
 
         {
-            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,
@@ -111,7 +162,7 @@ impl State {
                         load: wgpu::LoadOp::Clear(wgpu::Color {
                             r: 0.1,
                             g: 0.2,
-                            b: 0.6,
+                            b: 0.3,
                             a: 1.0,
                         }),
                         store: true,
@@ -119,6 +170,9 @@ impl State {
                 })],
                 depth_stencil_attachment: None,
             });
+
+            render_pass.set_pipeline(&self.render_pipeline);
+            render_pass.draw(0..3, 0..1);
         }
 
         // submit will accept anything that implements IntoIter
diff --git a/src/shader.wgsl b/src/shader.wgsl
new file mode 100644
index 0000000..bce42c1
--- /dev/null
+++ b/src/shader.wgsl
@@ -0,0 +1,27 @@
+// Vertex shader
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) vert_pos: vec3<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);
+    out.vert_pos = out.clip_position.xyz;
+    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);
+}
\ No newline at end of file