Initial shader compilation

blog/2025-03-30-draw-compute-shader/draw-compute/shader/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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blog/2025-03-30-draw-compute-shader/draw-compute/shader/Cargo.toml

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+[package]
+name = "shader"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["rlib", "cdylib"]
+
+[dependencies]
+bytemuck = { version = "1.22", features = ["derive"] }
+glam = { version = "0.30", default-features = false, features = ["bytemuck", "libm"] }
+spirv-std = "0.9.0"

blog/2025-03-30-draw-compute-shader/draw-compute/shader/src/lib.rs

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+#![no_std]
+use spirv_std::spirv;
+
+#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+#[repr(C)]
+pub struct Viewport {
+    pub offset_x: u32,
+    pub offset_y: u32,
+    pub width: u32,
+    pub height: u32,
+}
+
+const BLOCK_SIZE: u32 = 16;
+const BLACK: glam::Vec4 = glam::vec4(0.0, 0.0, 0.0, 1.0);
+const WHITE: glam::Vec4 = glam::vec4(1.0, 1.0, 1.0, 1.0);
+
+#[spirv(compute(threads(1)))]
+pub fn main_cs(
+    #[spirv(uniform, descriptor_set = 0, binding = 0)] viewport: &Viewport,
+    #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
+) {
+    for x in 0..viewport.width as usize {
+        for y in 0..viewport.height as usize {
+            let image_index = y * viewport.width as usize + x;
+        }
+    }
+}
+
+#[spirv(vertex)]
+pub fn main_vs(
+    #[spirv(vertex_index)] vert_id: u32,
+    #[spirv(position, invariant)] position: &mut glam::Vec4,
+) {
+    let output_uv = glam::vec2(((vert_id << 1) & 2) as f32, (vert_id & 2) as f32);
+    *position = (output_uv * 2.0 - 1.0, 0.0, 1.0).into();
+}
+
+#[spirv(fragment)]
+pub fn main_fs(
+    #[spirv(frag_coord)] frag_coord: glam::Vec4,
+    #[spirv(uniform, descriptor_set = 0, binding = 0)] viewport: &Viewport,
+    #[spirv(storage_buffer, descriptor_set = 0, binding = 1)] image: &mut [glam::Vec4],
+    output: &mut glam::Vec4,
+) {
+    *output = BLACK;
+}