1 files changed, 81 insertions, 0 deletions
diff --git a/src/command_buffer/submit/semaphores_wait.rs b/src/command_buffer/submit/semaphores_wait.rs
new file mode 100644
index 0000000..2ebcfed
--- /dev/null
+++ b/src/command_buffer/submit/semaphores_wait.rs
@@ -0,0 +1,81 @@
+// 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 smallvec::SmallVec;
+
+use crate::command_buffer::submit::SubmitCommandBufferBuilder;
+use crate::command_buffer::submit::SubmitPresentBuilder;
+use crate::sync::PipelineStages;
+use crate::sync::Semaphore;
+
+/// Prototype for a submission that waits on semaphores.
+///
+/// This prototype can't actually be submitted because it doesn't correspond to anything in Vulkan.
+/// However you can convert it into another builder prototype through the `Into` trait.
+#[derive(Debug)]
+pub struct SubmitSemaphoresWaitBuilder<'a> {
+    semaphores: SmallVec<[&'a Semaphore; 8]>,
+}
+
+impl<'a> SubmitSemaphoresWaitBuilder<'a> {
+    /// Builds a new empty `SubmitSemaphoresWaitBuilder`.
+    #[inline]
+    pub fn new() -> SubmitSemaphoresWaitBuilder<'a> {
+        SubmitSemaphoresWaitBuilder {
+            semaphores: SmallVec::new(),
+        }
+    }
+
+    /// Adds an operation that waits on a semaphore.
+    ///
+    /// The semaphore must be signaled by a previous submission.
+    #[inline]
+    pub unsafe fn add_wait_semaphore(&mut self, semaphore: &'a Semaphore) {
+        self.semaphores.push(semaphore);
+    }
+
+    /// Merges this builder with another builder.
+    #[inline]
+    pub fn merge(&mut self, mut other: SubmitSemaphoresWaitBuilder<'a>) {
+        self.semaphores.extend(other.semaphores.drain(..));
+    }
+}
+
+impl<'a> Into<SubmitCommandBufferBuilder<'a>> for SubmitSemaphoresWaitBuilder<'a> {
+    #[inline]
+    fn into(mut self) -> SubmitCommandBufferBuilder<'a> {
+        unsafe {
+            let mut builder = SubmitCommandBufferBuilder::new();
+            for sem in self.semaphores.drain(..) {
+                builder.add_wait_semaphore(
+                    sem,
+                    PipelineStages {
+                        // TODO: correct stages ; hard
+                        all_commands: true,
+                        ..PipelineStages::none()
+                    },
+                );
+            }
+            builder
+        }
+    }
+}
+
+impl<'a> Into<SubmitPresentBuilder<'a>> for SubmitSemaphoresWaitBuilder<'a> {
+    #[inline]
+    fn into(mut self) -> SubmitPresentBuilder<'a> {
+        unsafe {
+            let mut builder = SubmitPresentBuilder::new();
+            for sem in self.semaphores.drain(..) {
+                builder.add_wait_semaphore(sem);
+            }
+            builder
+        }
+    }
+}