Test setup for WebAssembly+WebGL (#3238)

Co-authored-by: Connor Fitzgerald <connorwadefitzgerald@gmail.com>

.github/workflows/ci.yml

@@ -172,6 +172,32 @@ jobs:
           cargo doc --target ${{ matrix.target }} -p wgpu -p wgpu-info -p player --all-features --no-deps
           cargo doc --target ${{ matrix.target }} -p wgpu-core --no-deps --features="portable_features"
 
+  wasm-test:
+    name: Test WebAssembly
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v3
+
+      - name: install rust stable
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          override: true
+
+      - name: install wasm-pack  # install from fork until this is merged: https://github.com/rustwasm/wasm-pack/pull/1185
+        run: |
+          # replace with "install wasm-pack action", which doesn't work for this project because of https://github.com/rustwasm/wasm-pack/issues/1180
+          #      - name: install wasm-pack
+          #        uses: jetli/wasm-pack-action@v0.4.0
+          cargo install --git https://github.com/haraldreingruber/wasm-pack wasm-pack
+
+      - name: execute tests
+        run: |
+          cd wgpu
+          wasm-pack test --headless --chrome --features webgl
+
   gpu-test:
     strategy:
       fail-fast: false

CHANGELOG.md

@@ -192,6 +192,7 @@ Additionally `Surface::get_default_config` now returns an Option and returns Non
 - Update the `minimum supported rust version` to 1.64
 - Use cargo 1.64 workspace inheritance feature. By @jinleili in [#3107](https://github.com/gfx-rs/wgpu/pull/3107)
 - Move `ResourceMetadata` into its own module. By @jimblandy in [#3213](https://github.com/gfx-rs/wgpu/pull/3213)
+- Add WebAssembly testing infrastructure. By @haraldreingruber in [#3238](https://github.com/gfx-rs/wgpu/pull/3238)
 
 #### Vulkan
 

Cargo.toml

@@ -112,6 +112,7 @@ console_log = "0.2"
 js-sys = "0.3.60"
 wasm-bindgen = "0.2.83"
 wasm-bindgen-futures = "0.4.33"
+wasm-bindgen-test = "0.3"
 web-sys = "0.3.60"
 
 # deno dependencies

wgpu/Cargo.toml

@@ -163,7 +163,8 @@ obj.workspace = true
 pollster.workspace = true
 png.workspace = true
 nanorand = { workspace = true, features = ["wyrand"] }
-winit.workspace = true                                 # for "halmark" example                                                        # for "halmark" example
+wasm-bindgen-test.workspace = true
+winit.workspace = true # for "halmark" example
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 async-executor.workspace = true
@@ -320,12 +321,13 @@ parking_lot.workspace = true
 [target.'cfg(target_arch = "wasm32")'.dev-dependencies]
 console_error_panic_hook.workspace = true
 console_log.workspace = true
-# We need these features in the framework examples
+# We need these features in the framework examples and tests
 web-sys = { workspace = true, features = [
     "Location",
     "Blob",
     "RequestInit",
     "RequestMode",
     "Request",
-    "Response"
+    "Response",
+    "WebGl2RenderingContext"
 ] }

wgpu/tests/buffer_usages.rs

@@ -1,11 +1,13 @@
 //! Tests for buffer usages validation.
 
 use crate::common::{fail_if, initialize_test, TestParameters};
+use wasm_bindgen_test::*;
 use wgt::BufferAddress;
 
 const BUFFER_SIZE: BufferAddress = 1234;
 
 #[test]
+#[wasm_bindgen_test]
 fn buffer_usage() {
     fn try_create(enable_mappable_primary_buffers: bool, usages: &[(bool, &[wgpu::BufferUsages])]) {
         let mut parameters = TestParameters::default();

wgpu/tests/clear_texture.rs

@@ -1,4 +1,5 @@
 use crate::common::{initialize_test, TestParameters, TestingContext};
+use wasm_bindgen_test::*;
 use wgpu::util::align_to;
 
 static TEXTURE_FORMATS_UNCOMPRESSED: &[wgpu::TextureFormat] = &[
@@ -202,9 +203,11 @@ fn single_texture_clear_test(
     size: wgpu::Extent3d,
     dimension: wgpu::TextureDimension,
 ) {
-    println!(
+    log::info!(
         "clearing texture with {:?}, dimension {:?}, size {:?}",
-        format, dimension, size
+        format,
+        dimension,
+        size
     );
 
     let texture = ctx.device.create_texture(&wgpu::TextureDescriptor {
@@ -315,6 +318,7 @@ fn clear_texture_2d_uncompressed() {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn clear_texture_d32_s8() {
     initialize_test(
         TestParameters::default()

wgpu/tests/common/mod.rs

@@ -3,12 +3,13 @@
 
 use std::panic::{catch_unwind, AssertUnwindSafe};
 
+use wgpu::{Adapter, Device, DownlevelFlags, Instance, Queue, Surface};
 use wgt::{Backends, DeviceDescriptor, DownlevelCapabilities, Features, Limits};
 
-use wgpu::{util, Adapter, Device, DownlevelFlags, Instance, Queue};
-
 pub mod image;
 
+const CANVAS_ID: &str = "test-canvas";
+
 async fn initialize_device(
     adapter: &Adapter,
     features: Features,
@@ -168,16 +169,12 @@ impl TestParameters {
 }
 pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(TestingContext)) {
     // We don't actually care if it fails
+    #[cfg(not(target_arch = "wasm32"))]
     let _ = env_logger::try_init();
+    #[cfg(target_arch = "wasm32")]
+    let _ = console_log::init_with_level(log::Level::Info);
 
-    let backend_bits = util::backend_bits_from_env().unwrap_or_else(Backends::all);
-    let instance = Instance::new(backend_bits);
-    let adapter = pollster::block_on(util::initialize_adapter_from_env_or_default(
-        &instance,
-        backend_bits,
-        None,
-    ))
-    .expect("could not find suitable adapter on the system");
+    let (adapter, _) = initialize_adapter();
 
     let adapter_info = adapter.get_info();
     let adapter_lowercase_name = adapter_info.name.to_lowercase();
@@ -187,19 +184,19 @@ pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(Te
 
     let missing_features = parameters.required_features - adapter_features;
     if !missing_features.is_empty() {
-        println!("TEST SKIPPED: MISSING FEATURES {:?}", missing_features);
+        log::info!("TEST SKIPPED: MISSING FEATURES {:?}", missing_features);
         return;
     }
 
     if !parameters.required_limits.check_limits(&adapter_limits) {
-        println!("TEST SKIPPED: LIMIT TOO LOW");
+        log::info!("TEST SKIPPED: LIMIT TOO LOW");
         return;
     }
 
     let missing_downlevel_flags =
         parameters.required_downlevel_properties.flags - adapter_downlevel_capabilities.flags;
     if !missing_downlevel_flags.is_empty() {
-        println!(
+        log::info!(
             "TEST SKIPPED: MISSING DOWNLEVEL FLAGS {:?}",
             missing_downlevel_flags
         );
@@ -209,7 +206,7 @@ pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(Te
     if adapter_downlevel_capabilities.shader_model
         < parameters.required_downlevel_properties.shader_model
     {
-        println!(
+        log::info!(
             "TEST SKIPPED: LOW SHADER MODEL {:?}",
             adapter_downlevel_capabilities.shader_model
         );
@@ -273,7 +270,7 @@ pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(Te
     });
 
     if let Some((reason, true)) = expected_failure_reason {
-        println!("EXPECTED TEST FAILURE SKIPPED: {:?}", reason);
+        log::info!("EXPECTED TEST FAILURE SKIPPED: {:?}", reason);
         return;
     }
 
@@ -301,9 +298,10 @@ pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(Te
         // We got the conditions we expected
         if let Some((expected_reason, _)) = expected_failure_reason {
             // Print out reason for the failure
-            println!(
+            log::info!(
                 "GOT EXPECTED TEST FAILURE DUE TO {}: {:?}",
-                failure_cause, expected_reason
+                failure_cause,
+                expected_reason
             );
         }
     } else if let Some((reason, _)) = expected_failure_reason {
@@ -314,6 +312,72 @@ pub fn initialize_test(parameters: TestParameters, test_function: impl FnOnce(Te
     }
 }
 
+fn initialize_adapter() -> (Adapter, SurfaceGuard) {
+    let backend_bits = wgpu::util::backend_bits_from_env().unwrap_or_else(Backends::all);
+    let instance = Instance::new(backend_bits);
+    let compatible_surface;
+
+    #[cfg(not(all(target_arch = "wasm32", feature = "webgl")))]
+    {
+        compatible_surface = None;
+    }
+    #[cfg(all(target_arch = "wasm32", feature = "webgl"))]
+    {
+        // On wasm, append a canvas to the document body for initializing the adapter
+        let canvas = create_html_canvas();
+
+        let surface = instance
+            .create_surface_from_canvas(&canvas)
+            .expect("could not create surface from canvas");
+
+        compatible_surface = Some(surface);
+    }
+
+    let compatible_surface: Option<&Surface> = compatible_surface.as_ref();
+    let adapter = pollster::block_on(wgpu::util::initialize_adapter_from_env_or_default(
+        &instance,
+        backend_bits,
+        compatible_surface,
+    ))
+    .expect("could not find suitable adapter on the system");
+
+    (adapter, SurfaceGuard)
+}
+
+struct SurfaceGuard;
+
+#[cfg(all(target_arch = "wasm32", feature = "webgl"))]
+impl Drop for SurfaceGuard {
+    fn drop(&mut self) {
+        delete_html_canvas();
+    }
+}
+
+#[cfg(all(target_arch = "wasm32", feature = "webgl"))]
+fn create_html_canvas() -> web_sys::HtmlCanvasElement {
+    use wasm_bindgen::JsCast;
+
+    web_sys::window()
+        .and_then(|win| win.document())
+        .and_then(|doc| {
+            let body = doc.body().unwrap();
+            let canvas = doc.create_element("Canvas").unwrap();
+            canvas.set_id(CANVAS_ID);
+            body.append_child(&canvas).unwrap();
+            canvas.dyn_into::<web_sys::HtmlCanvasElement>().ok()
+        })
+        .expect("couldn't append canvas to document body")
+}
+
+#[cfg(all(target_arch = "wasm32", feature = "webgl"))]
+fn delete_html_canvas() {
+    if let Some(document) = web_sys::window().and_then(|win| win.document()) {
+        if let Some(element) = document.get_element_by_id(CANVAS_ID) {
+            element.remove();
+        }
+    };
+}
+
 // Run some code in an error scope and assert that validation fails.
 pub fn fail<T>(device: &wgpu::Device, callback: impl FnOnce() -> T) -> T {
     device.push_error_scope(wgpu::ErrorFilter::Validation);

wgpu/tests/device.rs

@@ -1,6 +1,9 @@
+use wasm_bindgen_test::*;
+
 use crate::common::{initialize_test, TestParameters};
 
 #[test]
+#[wasm_bindgen_test]
 fn device_initialization() {
     initialize_test(TestParameters::default(), |_ctx| {
         // intentionally empty

wgpu/tests/encoder.rs

@@ -1,6 +1,8 @@
 use crate::common::{initialize_test, TestParameters};
+use wasm_bindgen_test::*;
 
 #[test]
+#[wasm_bindgen_test]
 fn drop_encoder() {
     initialize_test(TestParameters::default(), |ctx| {
         let encoder = ctx

wgpu/tests/instance.rs

@@ -1,4 +1,7 @@
+use wasm_bindgen_test::*;
+
 #[test]
+#[wasm_bindgen_test]
 fn initialize() {
     let _ = wgpu::Instance::new(
         wgpu::util::backend_bits_from_env().unwrap_or_else(wgpu::Backends::all),

wgpu/tests/poll.rs

@@ -7,6 +7,7 @@ use wgpu::{
 };
 
 use crate::common::{initialize_test, TestParameters, TestingContext};
+use wasm_bindgen_test::*;
 
 fn generate_dummy_work(ctx: &TestingContext) -> CommandBuffer {
     let buffer = ctx.device.create_buffer(&BufferDescriptor {
@@ -53,6 +54,7 @@ fn generate_dummy_work(ctx: &TestingContext) -> CommandBuffer {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn wait() {
     initialize_test(TestParameters::default().skip(), |ctx| {
         let cmd_buf = generate_dummy_work(&ctx);
@@ -63,6 +65,7 @@ fn wait() {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn double_wait() {
     initialize_test(TestParameters::default().skip(), |ctx| {
         let cmd_buf = generate_dummy_work(&ctx);
@@ -74,6 +77,7 @@ fn double_wait() {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn wait_on_submission() {
     initialize_test(TestParameters::default().skip(), |ctx| {
         let cmd_buf = generate_dummy_work(&ctx);
@@ -84,6 +88,7 @@ fn wait_on_submission() {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn double_wait_on_submission() {
     initialize_test(TestParameters::default().skip(), |ctx| {
         let cmd_buf = generate_dummy_work(&ctx);
@@ -95,6 +100,7 @@ fn double_wait_on_submission() {
 }
 
 #[test]
+#[wasm_bindgen_test]
 fn wait_out_of_order() {
     initialize_test(TestParameters::default().skip(), |ctx| {
         let cmd_buf1 = generate_dummy_work(&ctx);