avoid creating the bind group for indirect validation if buffer size is 0

tests/tests/dispatch_workgroups_indirect.rs

@@ -16,7 +16,7 @@ static NUM_WORKGROUPS_BUILTIN: GpuTestConfiguration = GpuTestConfiguration::new(
     )
     .run_async(|ctx| async move {
         let num_workgroups = [1, 2, 3];
-        let res = run_test(&ctx, &num_workgroups, false).await;
+        let res = run_test(&ctx, &num_workgroups).await;
         assert_eq!(res, num_workgroups);
     });
 
@@ -38,16 +38,16 @@ static DISCARD_DISPATCH: GpuTestConfiguration = GpuTestConfiguration::new()
     .run_async(|ctx| async move {
         let max = ctx.device.limits().max_compute_workgroups_per_dimension;
 
-        let res = run_test(&ctx, &[max, max, max], false).await;
+        let res = run_test(&ctx, &[max, max, max]).await;
         assert_eq!(res, [max; 3]);
 
-        let res = run_test(&ctx, &[max + 1, 1, 1], false).await;
+        let res = run_test(&ctx, &[max + 1, 1, 1]).await;
         assert_eq!(res, [0; 3]);
 
-        let res = run_test(&ctx, &[1, max + 1, 1], false).await;
+        let res = run_test(&ctx, &[1, max + 1, 1]).await;
         assert_eq!(res, [0; 3]);
 
-        let res = run_test(&ctx, &[1, 1, max + 1], false).await;
+        let res = run_test(&ctx, &[1, 1, max + 1]).await;
         assert_eq!(res, [0; 3]);
     });
 
@@ -68,7 +68,24 @@ static RESET_BIND_GROUPS: GpuTestConfiguration = GpuTestConfiguration::new()
     .run_async(|ctx| async move {
         ctx.device.push_error_scope(wgpu::ErrorFilter::Validation);
 
-        let _ = run_test(&ctx, &[0, 0, 0], true).await;
+        let test_resources = TestResources::new(&ctx);
+
+        let indirect_buffer = ctx.device.create_buffer(&wgpu::BufferDescriptor {
+            label: None,
+            size: 12,
+            usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::INDIRECT,
+            mapped_at_creation: false,
+        });
+
+        let mut encoder = ctx.device.create_command_encoder(&Default::default());
+        {
+            let mut compute_pass = encoder.begin_compute_pass(&Default::default());
+            compute_pass.set_pipeline(&test_resources.pipeline);
+            compute_pass.set_push_constants(0, &[0, 0, 0, 0]);
+            // compute_pass.set_bind_group(0, Some(&test_resources.bind_group), &[]);
+            compute_pass.dispatch_workgroups_indirect(&indirect_buffer, 0);
+        }
+        ctx.queue.submit(Some(encoder.finish()));
 
         let error = pollster::block_on(ctx.device.pop_error_scope());
         assert!(error.map_or(false, |error| {
@@ -76,11 +93,59 @@ static RESET_BIND_GROUPS: GpuTestConfiguration = GpuTestConfiguration::new()
         }));
     });
 
-async fn run_test(
-    ctx: &TestingContext,
-    num_workgroups: &[u32; 3],
-    forget_to_set_bind_group: bool,
-) -> [u32; 3] {
+/// Make sure that zero sized buffer validation is raised.
+#[gpu_test]
+static ZERO_SIZED_BUFFER: GpuTestConfiguration = GpuTestConfiguration::new()
+    .parameters(
+        TestParameters::default()
+            .features(wgpu::Features::PUSH_CONSTANTS)
+            .downlevel_flags(
+                wgpu::DownlevelFlags::COMPUTE_SHADERS | wgpu::DownlevelFlags::INDIRECT_EXECUTION,
+            )
+            .limits(wgpu::Limits {
+                max_push_constant_size: 4,
+                ..wgpu::Limits::downlevel_defaults()
+            }),
+    )
+    .run_async(|ctx| async move {
+        ctx.device.push_error_scope(wgpu::ErrorFilter::Validation);
+
+        let test_resources = TestResources::new(&ctx);
+
+        let indirect_buffer = ctx.device.create_buffer(&wgpu::BufferDescriptor {
+            label: None,
+            size: 0,
+            usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::INDIRECT,
+            mapped_at_creation: false,
+        });
+
+        let mut encoder = ctx.device.create_command_encoder(&Default::default());
+        {
+            let mut compute_pass = encoder.begin_compute_pass(&Default::default());
+            compute_pass.set_pipeline(&test_resources.pipeline);
+            compute_pass.set_push_constants(0, &[0, 0, 0, 0]);
+            compute_pass.set_bind_group(0, Some(&test_resources.bind_group), &[]);
+            compute_pass.dispatch_workgroups_indirect(&indirect_buffer, 0);
+        }
+        ctx.queue.submit(Some(encoder.finish()));
+
+        let error = pollster::block_on(ctx.device.pop_error_scope());
+        assert!(error.map_or(false, |error| {
+            format!("{error}").contains(
+                "Indirect buffer uses bytes 0..12 which overruns indirect buffer of size 0",
+            )
+        }));
+    });
+
+struct TestResources {
+    pipeline: wgpu::ComputePipeline,
+    out_buffer: wgpu::Buffer,
+    readback_buffer: wgpu::Buffer,
+    bind_group: wgpu::BindGroup,
+}
+
+impl TestResources {
+    fn new(ctx: &TestingContext) -> Self {
         const SHADER_SRC: &str = "
             struct TestOffsetPc {
                 inner: u32,
@@ -170,6 +235,18 @@ async fn run_test(
             }],
         });
 
+        Self {
+            pipeline,
+            out_buffer,
+            readback_buffer,
+            bind_group,
+        }
+    }
+}
+
+async fn run_test(ctx: &TestingContext, num_workgroups: &[u32; 3]) -> [u32; 3] {
+    let test_resources = TestResources::new(ctx);
+
     let mut res = None;
 
     for (indirect_offset, indirect_buffer_size) in [
@@ -202,19 +279,24 @@ async fn run_test(
         let mut encoder = ctx.device.create_command_encoder(&Default::default());
         {
             let mut compute_pass = encoder.begin_compute_pass(&Default::default());
-            compute_pass.set_pipeline(&pipeline);
+            compute_pass.set_pipeline(&test_resources.pipeline);
             compute_pass.set_push_constants(0, &[0, 0, 0, 0]);
-            if !forget_to_set_bind_group {
-                compute_pass.set_bind_group(0, Some(&bind_group), &[]);
-            }
+            compute_pass.set_bind_group(0, Some(&test_resources.bind_group), &[]);
             compute_pass.dispatch_workgroups_indirect(&indirect_buffer, indirect_offset);
         }
 
-        encoder.copy_buffer_to_buffer(&out_buffer, 0, &readback_buffer, 0, 12);
+        encoder.copy_buffer_to_buffer(
+            &test_resources.out_buffer,
+            0,
+            &test_resources.readback_buffer,
+            0,
+            12,
+        );
 
         ctx.queue.submit(Some(encoder.finish()));
 
-        readback_buffer
+        test_resources
+            .readback_buffer
             .slice(..)
             .map_async(wgpu::MapMode::Read, |_| {});
 
@@ -222,11 +304,11 @@ async fn run_test(
             .await
             .panic_on_timeout();
 
-        let view = readback_buffer.slice(..).get_mapped_range();
+        let view = test_resources.readback_buffer.slice(..).get_mapped_range();
 
         let current_res = *bytemuck::from_bytes(&view);
         drop(view);
-        readback_buffer.unmap();
+        test_resources.readback_buffer.unmap();
 
         if let Some(past_res) = res {
             assert_eq!(past_res, current_res);

wgpu-core/src/device/resource.rs

@@ -780,7 +780,10 @@ impl Device {
             let bind_group = indirect_validation
                 .create_src_bind_group(self.raw(), &self.limits, buffer_size, raw_buffer)
                 .map_err(resource::CreateBufferError::IndirectValidationBindGroup)?;
-            Ok(Snatchable::new(bind_group))
+            match bind_group {
+                Some(bind_group) => Ok(Snatchable::new(bind_group)),
+                None => Ok(Snatchable::empty()),
+            }
         } else {
             Ok(Snatchable::empty())
         }

wgpu-core/src/indirect_validation.rs

@@ -266,14 +266,18 @@ impl IndirectValidation {
         })
     }
 
+    /// `Ok(None)` will only be returned if `buffer_size` is `0`.
     pub fn create_src_bind_group(
         &self,
         device: &dyn hal::DynDevice,
         limits: &wgt::Limits,
         buffer_size: u64,
         buffer: &dyn hal::DynBuffer,
-    ) -> Result<Box<dyn hal::DynBindGroup>, DeviceError> {
+    ) -> Result<Option<Box<dyn hal::DynBindGroup>>, DeviceError> {
         let binding_size = calculate_src_buffer_binding_size(buffer_size, limits);
+        let Some(binding_size) = NonZeroU64::new(binding_size) else {
+            return Ok(None);
+        };
         let hal_desc = hal::BindGroupDescriptor {
             label: None,
             layout: self.src_bind_group_layout.as_ref(),
@@ -285,7 +289,7 @@ impl IndirectValidation {
             buffers: &[hal::BufferBinding {
                 buffer,
                 offset: 0,
-                size: Some(NonZeroU64::new(binding_size).unwrap()),
+                size: Some(binding_size),
             }],
             samplers: &[],
             textures: &[],
@@ -294,6 +298,7 @@ impl IndirectValidation {
         unsafe {
             device
                 .create_bind_group(&hal_desc)
+                .map(Some)
                 .map_err(DeviceError::from_hal)
         }
     }