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diff --git a/src/pipeline/input_assembly.rs b/src/pipeline/input_assembly.rs
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+// 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.
+
+//! Assembling vertices into primitives.
+//!
+//! The input assembly is the stage where lists of vertices are turned into primitives.
+//!
+
+/// How the input assembly stage should behave.
+#[derive(Copy, Clone, Debug)]
+#[deprecated]
+pub struct InputAssembly {
+    /// The type of primitives.
+    ///
+    /// Note that some topologies don't support primitive restart.
+    pub topology: PrimitiveTopology,
+
+    /// If true, then the special index value `0xffff` or `0xffffffff` will tell the GPU that it is
+    /// the end of the current primitive. A new primitive will restart at the next index.
+    ///
+    /// Note that some topologies don't support primitive restart.
+    pub primitive_restart_enable: bool,
+}
+
+impl InputAssembly {
+    /// Builds an `InputAssembly` struct with the `TriangleList` topology.
+    #[inline]
+    pub fn triangle_list() -> InputAssembly {
+        InputAssembly {
+            topology: PrimitiveTopology::TriangleList,
+            primitive_restart_enable: false,
+        }
+    }
+}
+
+/// Describes how vertices must be grouped together to form primitives.
+///
+/// Note that some topologies don't support primitive restart.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum PrimitiveTopology {
+    PointList,
+    LineList,
+    LineStrip,
+    TriangleList,
+    TriangleStrip,
+    TriangleFan,
+    LineListWithAdjacency,
+    LineStripWithAdjacency,
+    TriangleListWithAdjacency,
+    TriangleStripWithAdjacency,
+    PatchList { vertices_per_patch: u32 },
+}
+
+impl From<PrimitiveTopology> for ash::vk::PrimitiveTopology {
+    #[inline]
+    fn from(val: PrimitiveTopology) -> ash::vk::PrimitiveTopology {
+        match val {
+            PrimitiveTopology::PointList => ash::vk::PrimitiveTopology::POINT_LIST,
+            PrimitiveTopology::LineList => ash::vk::PrimitiveTopology::LINE_LIST,
+            PrimitiveTopology::LineStrip => ash::vk::PrimitiveTopology::LINE_STRIP,
+            PrimitiveTopology::TriangleList => ash::vk::PrimitiveTopology::TRIANGLE_LIST,
+            PrimitiveTopology::TriangleStrip => ash::vk::PrimitiveTopology::TRIANGLE_STRIP,
+            PrimitiveTopology::TriangleFan => ash::vk::PrimitiveTopology::TRIANGLE_FAN,
+            PrimitiveTopology::LineListWithAdjacency => {
+                ash::vk::PrimitiveTopology::LINE_LIST_WITH_ADJACENCY
+            }
+            PrimitiveTopology::LineStripWithAdjacency => {
+                ash::vk::PrimitiveTopology::LINE_STRIP_WITH_ADJACENCY
+            }
+            PrimitiveTopology::TriangleListWithAdjacency => {
+                ash::vk::PrimitiveTopology::TRIANGLE_LIST_WITH_ADJACENCY
+            }
+            PrimitiveTopology::TriangleStripWithAdjacency => {
+                ash::vk::PrimitiveTopology::TRIANGLE_STRIP_WITH_ADJACENCY
+            }
+            PrimitiveTopology::PatchList { .. } => ash::vk::PrimitiveTopology::PATCH_LIST,
+        }
+    }
+}
+
+impl PrimitiveTopology {
+    /// Returns true if this primitive topology supports using primitives restart.
+    #[inline]
+    pub fn supports_primitive_restart(&self) -> bool {
+        match *self {
+            PrimitiveTopology::LineStrip => true,
+            PrimitiveTopology::TriangleStrip => true,
+            PrimitiveTopology::TriangleFan => true,
+            PrimitiveTopology::LineStripWithAdjacency => true,
+            PrimitiveTopology::TriangleStripWithAdjacency => true,
+            _ => false,
+        }
+    }
+}
+
+/// Trait for types that can be used as indices by the GPU.
+pub unsafe trait Index {
+    /// Returns the type of data.
+    fn ty() -> IndexType;
+}
+
+unsafe impl Index for u16 {
+    #[inline(always)]
+    fn ty() -> IndexType {
+        IndexType::U16
+    }
+}
+
+unsafe impl Index for u32 {
+    #[inline(always)]
+    fn ty() -> IndexType {
+        IndexType::U32
+    }
+}
+
+/// An enumeration of all valid index types.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[allow(missing_docs)]
+#[repr(i32)]
+pub enum IndexType {
+    U16 = ash::vk::IndexType::UINT16.as_raw(),
+    U32 = ash::vk::IndexType::UINT32.as_raw(),
+}
+
+impl From<IndexType> for ash::vk::IndexType {
+    #[inline]
+    fn from(val: IndexType) -> Self {
+        Self::from_raw(val as i32)
+    }
+}