From 369fe05e79d4db201404f51aaac302efc776861d Mon Sep 17 00:00:00 2001
From: Chris Spencer <spencercw@gmail.com>
Date: Tue, 11 Jul 2023 14:45:04 +0100
Subject: [PATCH] extensions/google: Add VK_GOOGLE_display_timing (#765)

---
 Changelog.md                                |  1 +
 ash/src/extensions/google/display_timing.rs | 56 +++++++++++++++++++++
 ash/src/extensions/google/mod.rs            |  3 ++
 ash/src/extensions/mod.rs                   |  1 +
 4 files changed, 61 insertions(+)
 create mode 100644 ash/src/extensions/google/display_timing.rs
 create mode 100644 ash/src/extensions/google/mod.rs

diff --git a/Changelog.md b/Changelog.md
index d2d69e1..5decd99 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Allow building `Entry`/`Instance`/`Device` from handle+fns (see their `from_parts_1_x()` associated functions) (#748)
 - Update Vulkan-Headers to 1.3.254 (#760)
 - Added `VK_NV_memory_decompression` device extension (#761)
+- Added `VK_GOOGLE_display_timing` device extension (#765)
 
 ### Changed
 
diff --git a/ash/src/extensions/google/display_timing.rs b/ash/src/extensions/google/display_timing.rs
new file mode 100644
index 0000000..6b912cf
--- /dev/null
+++ b/ash/src/extensions/google/display_timing.rs
@@ -0,0 +1,56 @@
+use crate::prelude::*;
+use crate::vk;
+use crate::{Device, Instance};
+use std::ffi::CStr;
+use std::mem;
+
+/// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/VK_GOOGLE_display_timing.html>
+#[derive(Clone)]
+pub struct DisplayTiming {
+    handle: vk::Device,
+    fp: vk::GoogleDisplayTimingFn,
+}
+
+impl DisplayTiming {
+    pub fn new(instance: &Instance, device: &Device) -> Self {
+        let handle = device.handle();
+        let fp = vk::GoogleDisplayTimingFn::load(|name| unsafe {
+            mem::transmute(instance.get_device_proc_addr(handle, name.as_ptr()))
+        });
+        Self { handle, fp }
+    }
+
+    /// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/vkGetPastPresentationTimingGOOGLE.html>
+    #[inline]
+    pub unsafe fn get_past_presentation_timing(
+        &self,
+        swapchain: vk::SwapchainKHR,
+    ) -> VkResult<Vec<vk::PastPresentationTimingGOOGLE>> {
+        read_into_uninitialized_vector(|count, data| {
+            (self.fp.get_past_presentation_timing_google)(self.handle, swapchain, count, data)
+        })
+    }
+
+    /// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/vkGetRefreshCycleDurationGOOGLE.html>
+    #[inline]
+    pub unsafe fn get_refresh_cycle_duration(
+        &self,
+        swapchain: vk::SwapchainKHR,
+    ) -> VkResult<vk::RefreshCycleDurationGOOGLE> {
+        let mut properties = mem::zeroed();
+        (self.fp.get_refresh_cycle_duration_google)(self.handle, swapchain, &mut properties)
+            .result_with_success(properties)
+    }
+
+    pub const NAME: &'static CStr = vk::GoogleDisplayTimingFn::NAME;
+
+    #[inline]
+    pub fn fp(&self) -> &vk::GoogleDisplayTimingFn {
+        &self.fp
+    }
+
+    #[inline]
+    pub fn device(&self) -> vk::Device {
+        self.handle
+    }
+}
diff --git a/ash/src/extensions/google/mod.rs b/ash/src/extensions/google/mod.rs
new file mode 100644
index 0000000..7763d50
--- /dev/null
+++ b/ash/src/extensions/google/mod.rs
@@ -0,0 +1,3 @@
+pub use self::display_timing::DisplayTiming;
+
+mod display_timing;
diff --git a/ash/src/extensions/mod.rs b/ash/src/extensions/mod.rs
index 0e164d0..99d0c1f 100644
--- a/ash/src/extensions/mod.rs
+++ b/ash/src/extensions/mod.rs
@@ -1,4 +1,5 @@
 pub mod ext;
+pub mod google;
 pub mod khr;
 pub mod mvk;
 pub mod nn;