chore: naively set warn(unsafe_op_in_unsafe_fn) in wgpu-hal

Do the simplest mechanical work necessary to enable and satisfy this lint; only put down `unsafe`
blocks, don't try to inspect for correctness or anything else.

N.B.: that there _are_ some adjustments identified that could be made here, like breaking multiple
individual `unsafe` operations into their `unsafe` spans. This is left for a follow-up commit.

wgpu-hal/Cargo.toml

@@ -22,7 +22,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 [lib]
 
 [features]
-default = []
+default = ["gles"]
 metal = ["naga/msl-out", "block", "foreign-types"]
 vulkan = ["naga/spv-out", "ash", "gpu-alloc", "gpu-descriptor", "libloading", "smallvec"]
 gles = ["naga/glsl-out", "glow", "egl", "libloading"]

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

@@ -46,21 +46,23 @@ unsafe extern "system" fn output_debug_string_handler(
     exception_info: *mut winnt::EXCEPTION_POINTERS,
 ) -> i32 {
     // See https://stackoverflow.com/a/41480827
-    let record = &*(*exception_info).ExceptionRecord;
+    let record = unsafe { &*(*exception_info).ExceptionRecord };
     if record.NumberParameters != 2 {
         return excpt::EXCEPTION_CONTINUE_SEARCH;
     }
     let message = match record.ExceptionCode {
-        winnt::DBG_PRINTEXCEPTION_C => String::from_utf8_lossy(slice::from_raw_parts(
-            record.ExceptionInformation[1] as *const u8,
-            record.ExceptionInformation[0],
-        )),
-        winnt::DBG_PRINTEXCEPTION_WIDE_C => {
-            Cow::Owned(String::from_utf16_lossy(slice::from_raw_parts(
+        winnt::DBG_PRINTEXCEPTION_C => String::from_utf8_lossy(unsafe {
+            slice::from_raw_parts(
+                record.ExceptionInformation[1] as *const u8,
+                record.ExceptionInformation[0],
+            )
+        }),
+        winnt::DBG_PRINTEXCEPTION_WIDE_C => Cow::Owned(String::from_utf16_lossy(unsafe {
+            slice::from_raw_parts(
                 record.ExceptionInformation[1] as *const u16,
                 record.ExceptionInformation[0],
-            )))
-        }
+            )
+        })),
         _ => return excpt::EXCEPTION_CONTINUE_SEARCH,
     };
 

wgpu-hal/src/auxil/renderdoc.rs

@@ -44,12 +44,13 @@ impl RenderDoc {
         let renderdoc_filename = "libVkLayer_GLES_RenderDoc.so";
 
         #[cfg(unix)]
-        let renderdoc_result: Result<libloading::Library, libloading::Error> =
+        let renderdoc_result: Result<libloading::Library, libloading::Error> = unsafe {
             libloading::os::unix::Library::open(
                 Some(renderdoc_filename),
                 libloading::os::unix::RTLD_NOW | RTLD_NOLOAD,
             )
-            .map(|lib| lib.into());
+        }
+        .map(|lib| lib.into());
 
         #[cfg(windows)]
         let renderdoc_result: Result<libloading::Library, libloading::Error> =
@@ -68,22 +69,23 @@ impl RenderDoc {
             }
         };
 
-        let get_api: libloading::Symbol<GetApiFn> = match renderdoc_lib.get(b"RENDERDOC_GetAPI\0") {
-            Ok(api) => api,
-            Err(e) => {
-                return RenderDoc::NotAvailable {
-                    reason: format!(
-                        "Unable to get RENDERDOC_GetAPI from renderdoc library '{}': {:?}",
-                        renderdoc_filename, e
-                    ),
+        let get_api: libloading::Symbol<GetApiFn> =
+            match unsafe { renderdoc_lib.get(b"RENDERDOC_GetAPI\0") } {
+                Ok(api) => api,
+                Err(e) => {
+                    return RenderDoc::NotAvailable {
+                        reason: format!(
+                            "Unable to get RENDERDOC_GetAPI from renderdoc library '{}': {:?}",
+                            renderdoc_filename, e
+                        ),
+                    }
                 }
-            }
-        };
+            };
         let mut obj = ptr::null_mut();
-        match get_api(10401, &mut obj) {
+        match unsafe { get_api(10401, &mut obj) } {
             1 => RenderDoc::Available {
                 api: RenderDocApi {
-                    api: *(obj as *mut renderdoc_sys::RENDERDOC_API_1_4_1),
+                    api: unsafe { *(obj as *mut renderdoc_sys::RENDERDOC_API_1_4_1) },
                     lib: renderdoc_lib,
                 },
             },
@@ -115,7 +117,7 @@ impl RenderDoc {
     pub unsafe fn start_frame_capture(&self, device_handle: Handle, window_handle: Handle) -> bool {
         match *self {
             Self::Available { api: ref entry } => {
-                entry.api.StartFrameCapture.unwrap()(device_handle, window_handle);
+                unsafe { entry.api.StartFrameCapture.unwrap()(device_handle, window_handle) };
                 true
             }
             Self::NotAvailable { ref reason } => {
@@ -129,7 +131,7 @@ impl RenderDoc {
     pub unsafe fn end_frame_capture(&self, device_handle: Handle, window_handle: Handle) {
         match *self {
             Self::Available { api: ref entry } => {
-                entry.api.EndFrameCapture.unwrap()(device_handle, window_handle);
+                unsafe { entry.api.EndFrameCapture.unwrap()(device_handle, window_handle) };
             }
             Self::NotAvailable { ref reason } => {
                 log::warn!("Could not end RenderDoc frame capture: {}", reason)

wgpu-hal/src/dx11/device.rs

@@ -227,12 +227,14 @@ impl crate::Queue<super::Api> for super::Queue {
 impl super::D3D11Device {
     #[allow(trivial_casts)] // come on
     pub unsafe fn check_feature_support<T>(&self, feature: d3d11::D3D11_FEATURE) -> T {
-        let mut value = mem::zeroed::<T>();
-        let ret = self.CheckFeatureSupport(
-            feature,
-            &mut value as *mut T as *mut c_void,
-            mem::size_of::<T>() as u32,
-        );
+        let mut value = unsafe { mem::zeroed::<T>() };
+        let ret = unsafe {
+            self.CheckFeatureSupport(
+                feature,
+                &mut value as *mut T as *mut c_void,
+                mem::size_of::<T>() as u32,
+            )
+        };
         assert_eq!(ret.into_result(), Ok(()));
 
         value

wgpu-hal/src/dx12/adapter.rs

@@ -29,15 +29,17 @@ impl Drop for super::Adapter {
 
 impl super::Adapter {
     pub unsafe fn report_live_objects(&self) {
-        if let Ok(debug_device) = self
-            .raw
-            .cast::<d3d12sdklayers::ID3D12DebugDevice>()
-            .into_result()
-        {
-            debug_device.ReportLiveDeviceObjects(
-                d3d12sdklayers::D3D12_RLDO_SUMMARY | d3d12sdklayers::D3D12_RLDO_IGNORE_INTERNAL,
-            );
-            debug_device.destroy();
+        if let Ok(debug_device) = unsafe {
+            self.raw
+                .cast::<d3d12sdklayers::ID3D12DebugDevice>()
+                .into_result()
+        } {
+            unsafe {
+                debug_device.ReportLiveDeviceObjects(
+                    d3d12sdklayers::D3D12_RLDO_SUMMARY | d3d12sdklayers::D3D12_RLDO_IGNORE_INTERNAL,
+                )
+            };
+            unsafe { debug_device.destroy() };
         }
     }
 
@@ -365,35 +367,33 @@ impl crate::Adapter<super::Api> for super::Adapter {
 
         let mut data = d3d12::D3D12_FEATURE_DATA_FORMAT_SUPPORT {
             Format: raw_format,
-            Support1: mem::zeroed(),
-            Support2: mem::zeroed(),
+            Support1: unsafe { mem::zeroed() },
+            Support2: unsafe { mem::zeroed() },
         };
-        assert_eq!(
-            winerror::S_OK,
+        assert_eq!(winerror::S_OK, unsafe {
             self.device.CheckFeatureSupport(
                 d3d12::D3D12_FEATURE_FORMAT_SUPPORT,
                 &mut data as *mut _ as *mut _,
                 mem::size_of::<d3d12::D3D12_FEATURE_DATA_FORMAT_SUPPORT>() as _,
             )
-        );
+        });
 
         // Because we use a different format for SRV and UAV views of depth textures, we need to check
         // the features that use SRV/UAVs using the no-depth format.
         let mut data_no_depth = d3d12::D3D12_FEATURE_DATA_FORMAT_SUPPORT {
             Format: no_depth_format,
-            Support1: mem::zeroed(),
-            Support2: mem::zeroed(),
+            Support1: unsafe { mem::zeroed() },
+            Support2: unsafe { mem::zeroed() },
         };
         if raw_format != no_depth_format {
             // Only-recheck if we're using a different format
-            assert_eq!(
-                winerror::S_OK,
+            assert_eq!(winerror::S_OK, unsafe {
                 self.device.CheckFeatureSupport(
                     d3d12::D3D12_FEATURE_FORMAT_SUPPORT,
                     &mut data_no_depth as *mut _ as *mut _,
                     mem::size_of::<d3d12::D3D12_FEATURE_DATA_FORMAT_SUPPORT>() as _,
                 )
-            );
+            });
         } else {
             // Same format, just copy over.
             data_no_depth = data;
@@ -462,8 +462,8 @@ impl crate::Adapter<super::Api> for super::Adapter {
         let current_extent = {
             match surface.target {
                 SurfaceTarget::WndHandle(wnd_handle) => {
-                    let mut rect: windef::RECT = mem::zeroed();
-                    if winuser::GetClientRect(wnd_handle, &mut rect) != 0 {
+                    let mut rect: windef::RECT = unsafe { mem::zeroed() };
+                    if unsafe { winuser::GetClientRect(wnd_handle, &mut rect) } != 0 {
                         Some(wgt::Extent3d {
                             width: (rect.right - rect.left) as u32,
                             height: (rect.bottom - rect.top) as u32,