1 files changed, 55 insertions, 0 deletions
diff --git a/third_party/rust/gfx-hal/src/queue/family.rs b/third_party/rust/gfx-hal/src/queue/family.rs
new file mode 100644
index 0000000000..765e54d64c
--- /dev/null
+++ b/third_party/rust/gfx-hal/src/queue/family.rs
@@ -0,0 +1,55 @@
+//! Queue family and groups.
+
+use crate::queue::QueueType;
+use crate::Backend;
+
+use std::any::Any;
+use std::fmt::Debug;
+
+/// General information about a queue family, available upon adapter discovery.
+///
+/// Note that a backend can expose multiple queue families with the same properties.
+///
+/// Can be obtained from an [adapter][crate::adapter::Adapter] through its
+/// [`queue_families`][crate::adapter::Adapter::queue_families] field.
+pub trait QueueFamily: Debug + Any + Send + Sync {
+    /// Returns the type of queues.
+    fn queue_type(&self) -> QueueType;
+    /// Returns maximum number of queues created from this family.
+    fn max_queues(&self) -> usize;
+    /// Returns the queue family ID.
+    fn id(&self) -> QueueFamilyId;
+}
+
+/// Identifier for a queue family of a physical device.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+pub struct QueueFamilyId(pub usize);
+
+/// Bare-metal queue group.
+///
+/// Denotes all queues created from one queue family.
+#[derive(Debug)]
+pub struct QueueGroup<B: Backend> {
+    /// Family index for the queues in this group.
+    pub family: QueueFamilyId,
+    /// List of queues.
+    pub queues: Vec<B::CommandQueue>,
+}
+
+impl<B: Backend> QueueGroup<B> {
+    /// Create a new, empty queue group for a queue family.
+    pub fn new(family: QueueFamilyId) -> Self {
+        QueueGroup {
+            family,
+            queues: Vec::new(),
+        }
+    }
+
+    /// Add a command queue to the group.
+    ///
+    /// The queue needs to be created from this queue family.
+    pub fn add_queue(&mut self, queue: B::CommandQueue) {
+        self.queues.push(queue);
+    }
+}