1 files changed, 71 insertions, 0 deletions
diff --git a/src/descriptor_set/collection.rs b/src/descriptor_set/collection.rs
new file mode 100644
index 0000000..d62c15a
--- /dev/null
+++ b/src/descriptor_set/collection.rs
@@ -0,0 +1,71 @@
+// Copyright (c) 2016 The vulkano developers
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
+// license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
+// at your option. All files in the project carrying such
+// notice may not be copied, modified, or distributed except
+// according to those terms.
+
+use crate::descriptor_set::DescriptorSetWithOffsets;
+
+/// A collection of descriptor set objects.
+pub unsafe trait DescriptorSetsCollection {
+    fn into_vec(self) -> Vec<DescriptorSetWithOffsets>;
+}
+
+unsafe impl DescriptorSetsCollection for () {
+    #[inline]
+    fn into_vec(self) -> Vec<DescriptorSetWithOffsets> {
+        vec![]
+    }
+}
+
+unsafe impl<T> DescriptorSetsCollection for T
+where
+    T: Into<DescriptorSetWithOffsets>,
+{
+    #[inline]
+    fn into_vec(self) -> Vec<DescriptorSetWithOffsets> {
+        vec![self.into()]
+    }
+}
+
+unsafe impl<T> DescriptorSetsCollection for Vec<T>
+where
+    T: Into<DescriptorSetWithOffsets>,
+{
+    #[inline]
+    fn into_vec(self) -> Vec<DescriptorSetWithOffsets> {
+        self.into_iter().map(|x| x.into()).collect()
+    }
+}
+
+macro_rules! impl_collection {
+    ($first:ident $(, $others:ident)+) => (
+        unsafe impl<$first$(, $others)+> DescriptorSetsCollection for ($first, $($others),+)
+            where $first: Into<DescriptorSetWithOffsets>
+                  $(, $others: Into<DescriptorSetWithOffsets>)*
+        {
+            #[inline]
+            fn into_vec(self) -> Vec<DescriptorSetWithOffsets> {
+                #![allow(non_snake_case)]
+
+                let ($first, $($others,)*) = self;
+
+                let mut list = Vec::new();
+                list.push($first.into());
+                $(
+                    list.push($others.into());
+                )+
+                list
+            }
+        }
+
+        impl_collection!($($others),+);
+    );
+
+    ($i:ident) => ();
+}
+
+impl_collection!(Z, Y, X, W, V, U, T, S, R, Q, P, O, N, M, L, K, J, I, H, G, F, E, D, C, B, A);