1 files changed, 72 insertions, 0 deletions
diff --git a/src/command_buffer/validity/indirect_buffer.rs b/src/command_buffer/validity/indirect_buffer.rs
new file mode 100644
index 0000000..3acd4b2
--- /dev/null
+++ b/src/command_buffer/validity/indirect_buffer.rs
@@ -0,0 +1,72 @@
+// Copyright (c) 2021 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::buffer::BufferAccess;
+use crate::device::Device;
+use crate::device::DeviceOwned;
+use crate::VulkanObject;
+use std::error;
+use std::fmt;
+
+/// Checks whether an indirect buffer can be bound.
+pub fn check_indirect_buffer<Inb>(
+    device: &Device,
+    buffer: &Inb,
+) -> Result<(), CheckIndirectBufferError>
+where
+    Inb: BufferAccess + Send + Sync + 'static,
+{
+    assert_eq!(
+        buffer.inner().buffer.device().internal_object(),
+        device.internal_object()
+    );
+
+    if !buffer.inner().buffer.usage().indirect_buffer {
+        return Err(CheckIndirectBufferError::BufferMissingUsage);
+    }
+
+    Ok(())
+}
+
+/// Error that can happen when checking whether binding an indirect buffer is valid.
+#[derive(Debug, Copy, Clone)]
+pub enum CheckIndirectBufferError {
+    /// The "indirect buffer" usage must be enabled on the indirect buffer.
+    BufferMissingUsage,
+    /// The maximum number of indirect draws has been exceeded.
+    MaxDrawIndirectCountLimitExceeded {
+        /// The limit that must be fulfilled.
+        limit: u32,
+        /// What was requested.
+        requested: u32,
+    },
+}
+
+impl error::Error for CheckIndirectBufferError {}
+
+impl fmt::Display for CheckIndirectBufferError {
+    #[inline]
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        write!(
+            fmt,
+            "{}",
+            match *self {
+                CheckIndirectBufferError::BufferMissingUsage => {
+                    "the indirect buffer usage must be enabled on the indirect buffer"
+                }
+                CheckIndirectBufferError::MaxDrawIndirectCountLimitExceeded {
+                    limit,
+                    requested,
+                } => {
+                    "the maximum number of indirect draws has been exceeded"
+                }
+            }
+        )
+    }
+}