extensions: Add VK_KHR_present_wait (#493)

Changelog.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - ReleaseDate
 
+### Added
+
+- Add `VK_KHR_present_wait` extension (#493)
+
 ## [0.33.3] - 2021-09-08
 
 ### Added

ash/src/extensions/khr/mod.rs

@@ -16,6 +16,7 @@ pub use self::maintenance1::Maintenance1;
 pub use self::maintenance3::Maintenance3;
 pub use self::maintenance4::Maintenance4;
 pub use self::pipeline_executable_properties::PipelineExecutableProperties;
+pub use self::present_wait::PresentWait;
 pub use self::push_descriptor::PushDescriptor;
 pub use self::ray_tracing_pipeline::RayTracingPipeline;
 pub use self::surface::Surface;
@@ -45,6 +46,7 @@ mod maintenance1;
 mod maintenance3;
 mod maintenance4;
 mod pipeline_executable_properties;
+mod present_wait;
 mod push_descriptor;
 mod ray_tracing_pipeline;
 mod surface;

ash/src/extensions/khr/present_wait.rs

@@ -0,0 +1,45 @@
+use crate::prelude::*;
+use crate::vk;
+use crate::{Device, Instance};
+use std::ffi::CStr;
+use std::mem;
+
+#[derive(Clone)]
+pub struct PresentWait {
+    handle: vk::Device,
+    fns: vk::KhrPresentWaitFn,
+}
+
+impl PresentWait {
+    pub fn new(instance: &Instance, device: &Device) -> Self {
+        let handle = device.handle();
+        let fns = vk::KhrPresentWaitFn::load(|name| unsafe {
+            mem::transmute(instance.get_device_proc_addr(handle, name.as_ptr()))
+        });
+        Self { handle, fns }
+    }
+
+    #[doc = "<https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vkWaitForPresentKHR.html>"]
+    pub unsafe fn wait_for_present(
+        &self,
+        swapchain: vk::SwapchainKHR,
+        present_id: u64,
+        timeout: u64,
+    ) -> VkResult<()> {
+        self.fns
+            .wait_for_present_khr(self.handle, swapchain, present_id, timeout)
+            .result()
+    }
+
+    pub fn name() -> &'static CStr {
+        vk::KhrPresentWaitFn::name()
+    }
+
+    pub fn fp(&self) -> &vk::KhrPresentWaitFn {
+        &self.fns
+    }
+
+    pub fn device(&self) -> vk::Device {
+        self.handle
+    }
+}