blake3 difftest

tests/difftests/tests/Cargo.toml

@@ -1,7 +1,8 @@
 [workspace]
 resolver = "2"
 members = [
-    "simple-compute/simple-compute-rust",
+    "blake3/blake3-rust",
+    "blake3/blake3-rust-gpu",
     "simple-compute/simple-compute-wgsl",
 ]
 
@@ -21,6 +22,8 @@ spirv-std = { path = "../../../crates/spirv-std", version = "=0.9.0" }
 spirv-std-types = { path = "../../../crates/spirv-std/shared", version = "=0.9.0" }
 spirv-std-macros = { path = "../../../crates/spirv-std/macros", version = "=0.9.0" }
 difftest = { path = "../../../tests/difftests/lib" }
+anyhow = "1.0.98"
+bytemuck = "1.21.0"
 # External dependencies that need to be mentioned more than once.
 num-traits = { version = "0.2.15", default-features = false }
 glam = { version = ">=0.22, <=0.29", default-features = false }

tests/difftests/tests/blake3/blake3-rust-gpu/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "blake3-rust-gpu"
+edition.workspace = true
+
+[lints]
+workspace = true
+
+[lib]
+crate-type = ["rlib", "dylib"]
+
+# Common deps
+[dependencies]
+
+# GPU deps
+spirv-std.workspace = true
+blake3 = {version = "1.8.2", default-features = false}
+
+# CPU deps
+[target.'cfg(not(target_arch = "spirv"))'.dependencies]
+difftest.workspace = true

tests/difftests/tests/blake3/blake3-rust-gpu/src/lib.rs

@@ -0,0 +1,13 @@
+#![no_std]
+
+use spirv_std::spirv;
+
+#[spirv(compute(threads(1)))]
+pub fn main_cs(#[spirv(storage_buffer, descriptor_set = 0, binding = 0)] output: &mut [u32]) {
+    let hash = blake3::Hasher::new().finalize();
+    let bytes = hash.as_bytes();
+
+    for i in 0..8 {
+        output[i] = u32::from_le_bytes([bytes[i], bytes[i + 1], bytes[i + 2], bytes[i + 3]]);
+    }
+}

tests/difftests/tests/blake3/blake3-rust-gpu/src/main.rs

@@ -0,0 +1,13 @@
+use difftest::config::Config;
+use difftest::scaffold::compute::{RustComputeShader, WgpuComputeTest};
+
+fn main() {
+    // Load the config from the harness.
+    let config = Config::from_path(std::env::args().nth(1).unwrap()).unwrap();
+
+    // Define test parameters, loading the rust shader from the current crate.
+    let test = WgpuComputeTest::new(RustComputeShader::default(), [1, 1, 1], 1024);
+
+    // Run the test and write the output to a file.
+    test.run_test(&config).unwrap();
+}

tests/difftests/tests/blake3/blake3-rust/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "blake3-rust"
+edition.workspace = true
+
+[lints]
+workspace = true
+
+[dependencies]
+difftest.workspace = true
+anyhow.workspace = true
+bytemuck.workspace = true
+blake3-rust-gpu = {path = "../blake3-rust-gpu"}

tests/difftests/tests/blake3/blake3-rust/src/main.rs

@@ -0,0 +1,16 @@
+use difftest::config::Config;
+use std::fs::File;
+use std::io::Write;
+
+fn main() {
+    let mut buf = [0u32; 256];
+    blake3_rust_gpu::main_cs(&mut buf);
+    write_cpu_test(bytemuck::bytes_of(&buf)).unwrap();
+}
+
+fn write_cpu_test(output: &[u8]) -> anyhow::Result<()> {
+    let config = Config::from_path(std::env::args().nth(1).unwrap()).unwrap();
+    let mut f = File::create(&config.output_path)?;
+    f.write_all(&output)?;
+    Ok(())
+}