Properly enable getrandom in nanorand (#8098)

Author: cwfitzgerald

.cargo/config.toml

@@ -1,2 +1,6 @@
 [alias]
 xtask = "run -p wgpu-xtask --"
+
+# Needed until https://github.com/rust-random/getrandom/issues/675 is resolved.
+[target.wasm32-unknown-unknown]
+rustflags = ["--cfg", "getrandom_backend=\"wasm_js\""]

.github/workflows/ci.yml

@@ -261,6 +261,8 @@ jobs:
         run: |
           set -e
 
+          export RUSTFLAGS="$RUSTFLAGS --cfg getrandom_backend=\"wasm_js\""
+
           # build for WebGPU
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} --tests --features glsl,spirv,fragile-send-sync-non-atomic-wasm
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} --tests --features glsl,spirv
@@ -487,6 +489,9 @@ jobs:
       - name: Execute tests
         run: |
           cd wgpu
+
+          export RUSTFLAGS="$RUSTFLAGS --cfg getrandom_backend=\"wasm_js\""
+
           wasm-pack test --headless --chrome --no-default-features --features wgsl,webgl,web --workspace
 
   gpu-test:

Cargo.lock

@@ -116,6 +116,7 @@ env_logger = { version = "0.11", default-features = false }
 fern = "0.7"
 flume = "0.11"
 futures-lite = "2"
+getrandom = "0.3"
 glam = "0.30"
 glob = "0.3"
 half = { version = "2.5", default-features = false } # We require 2.5 to have `Arbitrary` support.

Cargo.toml

@@ -35,10 +35,11 @@ bytemuck.workspace = true
 cfg-if.workspace = true
 encase = { workspace = true, features = ["glam"] }
 flume.workspace = true
+getrandom = { workspace = true, features = ["wasm_js"] }
 glam = { workspace = true, features = ["bytemuck"] }
 ktx2.workspace = true
 log.workspace = true
-nanorand = { workspace = true, features = ["tls"] }
+nanorand = { workspace = true, features = ["getrandom"] }
 noise.workspace = true
 obj.workspace = true
 png.workspace = true

examples/features/Cargo.toml

@@ -13,9 +13,11 @@ async fn run() {
     let mut numbers = [0u32; 256];
     let context = WgpuContext::new(size_of_val(&numbers)).await;
 
+    let mut rand = nanorand::WyRand::new();
+
     for _ in 0..10 {
         for p in numbers.iter_mut() {
-            *p = nanorand::tls_rng().generate::<u16>() as u32;
+            *p = rand.generate::<u16>() as u32;
         }
 
         compute(&mut numbers, &context).await;