1 files changed, 42 insertions, 0 deletions
diff --git a/third_party/rust/wgpu-hal/src/auxil/dxgi/result.rs b/third_party/rust/wgpu-hal/src/auxil/dxgi/result.rs
new file mode 100644
index 0000000000..db013d2dec
--- /dev/null
+++ b/third_party/rust/wgpu-hal/src/auxil/dxgi/result.rs
@@ -0,0 +1,42 @@
+use std::borrow::Cow;
+
+use winapi::shared::winerror;
+
+pub(crate) trait HResult<O> {
+    fn into_result(self) -> Result<O, Cow<'static, str>>;
+    fn into_device_result(self, description: &str) -> Result<O, crate::DeviceError>;
+}
+impl HResult<()> for i32 {
+    fn into_result(self) -> Result<(), Cow<'static, str>> {
+        if self >= 0 {
+            return Ok(());
+        }
+        let description = match self {
+            winerror::E_UNEXPECTED => "unexpected",
+            winerror::E_NOTIMPL => "not implemented",
+            winerror::E_OUTOFMEMORY => "out of memory",
+            winerror::E_INVALIDARG => "invalid argument",
+            _ => return Err(Cow::Owned(format!("0x{:X}", self as u32))),
+        };
+        Err(Cow::Borrowed(description))
+    }
+    fn into_device_result(self, description: &str) -> Result<(), crate::DeviceError> {
+        self.into_result().map_err(|err| {
+            log::error!("{} failed: {}", description, err);
+            if self == winerror::E_OUTOFMEMORY {
+                crate::DeviceError::OutOfMemory
+            } else {
+                crate::DeviceError::Lost
+            }
+        })
+    }
+}
+
+impl<T> HResult<T> for (T, i32) {
+    fn into_result(self) -> Result<T, Cow<'static, str>> {
+        self.1.into_result().map(|()| self.0)
+    }
+    fn into_device_result(self, description: &str) -> Result<T, crate::DeviceError> {
+        self.1.into_device_result(description).map(|()| self.0)
+    }
+}