[wgpu-hal]: MVP no_std support (#7599)

* MVP `no_std` support in `wgpu-hal`

* Update CHANGELOG.md

* Fix visibility

* Fix unused imports

* Response to feedback

Co-Authored-By: Connor Fitzgerald <[email protected]>

* Update other `validation_canary` usages

Co-Authored-By: Connor Fitzgerald <[email protected]>

---------

Co-authored-by: Connor Fitzgerald <[email protected]>

Author: bushrat011899

.github/workflows/ci.yml

@@ -302,10 +302,12 @@ jobs:
           # check with no features
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-types --no-default-features
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p naga --no-default-features
+          cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-hal --no-default-features
 
           # Check with all compatible features
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-types --no-default-features --features strict_asserts,fragile-send-sync-non-atomic-wasm,serde,counters
           cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p naga --no-default-features --features dot-out,compact
+          cargo clippy --target ${{ matrix.target }} ${{ matrix.extra-flags }} -p wgpu-hal --no-default-features --features fragile-send-sync-non-atomic-wasm
 
       # Building for native platforms with standard tests.
       - name: Check native

CHANGELOG.md

@@ -106,6 +106,10 @@ Naga now infers the correct binding layout when a resource appears only in an as
 
 - The type of the `size` parameter to `copy_buffer_to_buffer` has changed from `BufferAddress` to `impl Into<Option<BufferAddress>>`. This achieves the spec-defined behavior of the value being optional, while still accepting existing calls without changes. By @andyleiserson in [#7659](https://github.com/gfx-rs/wgpu/pull/7659).
 
+#### HAL
+
+- Added initial `no_std` support to `wgpu-hal`. By @bushrat011899 in [#7599](https://github.com/gfx-rs/wgpu/pull/7599)
+
 ### Bug Fixes
 
 #### Naga

Cargo.lock

@@ -78,7 +78,7 @@ wgpu-core = { version = "25.0.0", path = "./wgpu-core" }
 wgpu-hal = { version = "25.0.0", path = "./wgpu-hal" }
 wgpu-macros = { version = "25.0.0", path = "./wgpu-macros" }
 wgpu-test = { version = "25.0.0", path = "./tests" }
-wgpu-types = { version = "25.0.0", path = "./wgpu-types" }
+wgpu-types = { version = "25.0.0", path = "./wgpu-types", default-features = false }
 
 # These _cannot_ have a version specified. If it does, crates.io will look
 # for a version of the package on crates when we publish naga. Path dependencies

Cargo.toml

@@ -25,7 +25,7 @@ wgpu-core = { workspace = true, features = [
     "wgsl",
     "gles",
 ] }
-wgpu-types = { workspace = true, features = ["serde"] }
+wgpu-types = { workspace = true, features = ["serde", "std"] }
 
 deno_core.workspace = true
 deno_error.workspace = true

deno_webgpu/Cargo.toml

@@ -45,6 +45,7 @@ png.workspace = true
 pollster.workspace = true
 web-time.workspace = true
 wgpu-types = { workspace = true, features = [
+    "std",
     "trace", # TODO(#5974): this should be a dep on wgpu/trace and not wgpu-types at all
 ] }
 winit.workspace = true

examples/features/Cargo.toml

@@ -19,7 +19,7 @@ name = "play"
 test = false
 
 [dependencies]
-wgpu-types = { workspace = true, features = ["serde"] }
+wgpu-types = { workspace = true, features = ["serde", "std"] }
 
 env_logger.workspace = true
 log.workspace = true

player/Cargo.toml

@@ -32,6 +32,7 @@ webgl = ["wgpu/webgl"]
 
 [dependencies]
 wgpu = { workspace = true, features = ["noop"] }
+wgpu-hal = { workspace = true, features = ["validation_canary"] }
 wgpu-macros.workspace = true
 
 anyhow.workspace = true

tests/Cargo.toml

@@ -81,6 +81,7 @@ metal = [
     "dep:log",
     "dep:metal",
     "dep:objc",
+    "dep:parking_lot",
     "dep:profiling",
 ]
 vulkan = [
@@ -96,6 +97,7 @@ vulkan = [
     "dep:libloading",
     "dep:log",
     "dep:ordered-float",
+    "dep:parking_lot",
     "dep:profiling",
     "dep:smallvec",
     "dep:windows",
@@ -115,6 +117,7 @@ gles = [
     "dep:log",
     "dep:ndk-sys",
     "dep:objc",
+    "dep:parking_lot",
     "dep:profiling",
     "dep:wasm-bindgen",
     "dep:web-sys",
@@ -134,6 +137,7 @@ dx12 = [
     "dep:libloading",
     "dep:log",
     "dep:ordered-float",
+    "dep:parking_lot",
     "dep:profiling",
     "dep:range-alloc",
     "dep:windows-core",
@@ -175,6 +179,8 @@ device_lost_panic = []
 #
 # Only affects the d3d12 and vulkan backends.
 internal_error_panic = []
+# Tracks validation errors in a `VALIDATION_CANARY` static.
+validation_canary = ["dep:parking_lot"]
 
 ###################
 ### Workarounds ###
@@ -197,12 +203,12 @@ required-features = ["gles"]
 
 [dependencies]
 naga.workspace = true
-wgpu-types.workspace = true
+wgpu-types = { workspace = true, default-features = false }
 
 # Dependencies in the lib and empty backend
 bitflags.workspace = true
 raw-window-handle.workspace = true
-parking_lot.workspace = true
+parking_lot = { workspace = true, optional = true }
 thiserror.workspace = true
 
 # Target agnostic dependencies used only in backends.

wgpu-hal/Cargo.toml

@@ -1,7 +1,4 @@
-use alloc::{
-    borrow::Cow,
-    string::{String, ToString as _},
-};
+use alloc::{borrow::Cow, string::String};
 
 use parking_lot::Mutex;
 use windows::Win32::{Foundation, System::Diagnostics::Debug};
@@ -86,7 +83,10 @@ unsafe extern "system" fn output_debug_string_handler(
         log::log!(level, "{}", message);
     });
 
+    #[cfg(feature = "validation_canary")]
     if cfg!(debug_assertions) && level == log::Level::Error {
+        use alloc::string::ToString as _;
+
         // Set canary and continue
         crate::VALIDATION_CANARY.add(message.to_string());
     }

wgpu-hal/src/auxil/dxgi/exception.rs

@@ -1087,6 +1087,7 @@ fn gl_debug_message_callback(source: u32, gltype: u32, id: u32, severity: u32, m
         );
     });
 
+    #[cfg(feature = "validation_canary")]
     if cfg!(debug_assertions) && log_severity == log::Level::Error {
         // Set canary and continue
         crate::VALIDATION_CANARY.add(message.to_string());

wgpu-hal/src/gles/mod.rs

@@ -275,6 +275,11 @@ pub mod api {
 }
 
 mod dynamic;
+#[cfg(feature = "validation_canary")]
+mod validation_canary;
+
+#[cfg(feature = "validation_canary")]
+pub use validation_canary::{ValidationCanary, VALIDATION_CANARY};
 
 pub(crate) use dynamic::impl_dyn_resource;
 pub use dynamic::{
@@ -298,7 +303,6 @@ use core::{
 };
 
 use bitflags::bitflags;
-use parking_lot::Mutex;
 use thiserror::Error;
 use wgt::WasmNotSendSync;
 
@@ -2375,42 +2379,6 @@ pub struct ComputePassDescriptor<'a, Q: DynQuerySet + ?Sized> {
     pub timestamp_writes: Option<PassTimestampWrites<'a, Q>>,
 }
 
-/// Stores the text of any validation errors that have occurred since
-/// the last call to `get_and_reset`.
-///
-/// Each value is a validation error and a message associated with it,
-/// or `None` if the error has no message from the api.
-///
-/// This is used for internal wgpu testing only and _must not_ be used
-/// as a way to check for errors.
-///
-/// This works as a static because `cargo nextest` runs all of our
-/// tests in separate processes, so each test gets its own canary.
-///
-/// This prevents the issue of one validation error terminating the
-/// entire process.
-pub static VALIDATION_CANARY: ValidationCanary = ValidationCanary {
-    inner: Mutex::new(Vec::new()),
-};
-
-/// Flag for internal testing.
-pub struct ValidationCanary {
-    inner: Mutex<Vec<String>>,
-}
-
-impl ValidationCanary {
-    #[allow(dead_code)] // in some configurations this function is dead
-    fn add(&self, msg: String) {
-        self.inner.lock().push(msg);
-    }
-
-    /// Returns any API validation errors that have occurred in this process
-    /// since the last call to this function.
-    pub fn get_and_reset(&self) -> Vec<String> {
-        self.inner.lock().drain(..).collect()
-    }
-}
-
 #[test]
 fn test_default_limits() {
     let limits = wgt::Limits::default();

wgpu-hal/src/lib.rs

@@ -0,0 +1,39 @@
+use alloc::{string::String, vec::Vec};
+
+use parking_lot::Mutex;
+
+/// Stores the text of any validation errors that have occurred since
+/// the last call to `get_and_reset`.
+///
+/// Each value is a validation error and a message associated with it,
+/// or `None` if the error has no message from the api.
+///
+/// This is used for internal wgpu testing only and _must not_ be used
+/// as a way to check for errors.
+///
+/// This works as a static because `cargo nextest` runs all of our
+/// tests in separate processes, so each test gets its own canary.
+///
+/// This prevents the issue of one validation error terminating the
+/// entire process.
+pub static VALIDATION_CANARY: ValidationCanary = ValidationCanary {
+    inner: Mutex::new(Vec::new()),
+};
+
+/// Flag for internal testing.
+pub struct ValidationCanary {
+    inner: Mutex<Vec<String>>,
+}
+
+impl ValidationCanary {
+    #[allow(dead_code)] // in some configurations this function is dead
+    pub(crate) fn add(&self, msg: String) {
+        self.inner.lock().push(msg);
+    }
+
+    /// Returns any API validation errors that have occurred in this process
+    /// since the last call to this function.
+    pub fn get_and_reset(&self) -> Vec<String> {
+        self.inner.lock().drain(..).collect()
+    }
+}

wgpu-hal/src/validation_canary.rs

@@ -1,11 +1,4 @@
-use alloc::{
-    borrow::ToOwned as _,
-    boxed::Box,
-    ffi::CString,
-    string::{String, ToString as _},
-    sync::Arc,
-    vec::Vec,
-};
+use alloc::{borrow::ToOwned as _, boxed::Box, ffi::CString, string::String, sync::Arc, vec::Vec};
 use core::{
     ffi::{c_void, CStr},
     slice,
@@ -145,7 +138,10 @@ unsafe extern "system" fn debug_utils_messenger_callback(
         });
     }
 
+    #[cfg(feature = "validation_canary")]
     if cfg!(debug_assertions) && level == log::Level::Error {
+        use alloc::string::ToString as _;
+
         // Set canary and continue
         crate::VALIDATION_CANARY.add(message.to_string());
     }