extensions/khr: Add VK_KHR_performance_query (#726)

Changelog.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Update Vulkan-Headers to 1.3.244 (#697)
+- Added `VK_KHR_performance_query` device extension (#726)
 
 ### Changed
 

ash/src/extensions/khr/mod.rs

@@ -22,6 +22,7 @@ pub use self::get_surface_capabilities2::GetSurfaceCapabilities2;
 pub use self::maintenance1::Maintenance1;
 pub use self::maintenance3::Maintenance3;
 pub use self::maintenance4::Maintenance4;
+pub use self::performance_query::PerformanceQuery;
 pub use self::pipeline_executable_properties::PipelineExecutableProperties;
 pub use self::present_wait::PresentWait;
 pub use self::push_descriptor::PushDescriptor;
@@ -60,6 +61,7 @@ mod get_surface_capabilities2;
 mod maintenance1;
 mod maintenance3;
 mod maintenance4;
+mod performance_query;
 mod pipeline_executable_properties;
 mod present_wait;
 mod push_descriptor;

ash/src/extensions/khr/performance_query.rs

@@ -0,0 +1,118 @@
+use crate::prelude::*;
+use crate::vk;
+use crate::{Entry, Instance};
+use std::ffi::CStr;
+use std::mem;
+use std::ptr;
+
+/// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/VK_KHR_performance_query.html>
+#[derive(Clone)]
+pub struct PerformanceQuery {
+    handle: vk::Instance,
+    fp: vk::KhrPerformanceQueryFn,
+}
+
+impl PerformanceQuery {
+    pub fn new(entry: &Entry, instance: &Instance) -> Self {
+        let handle = instance.handle();
+        let fp = vk::KhrPerformanceQueryFn::load(|name| unsafe {
+            mem::transmute(entry.get_instance_proc_addr(handle, name.as_ptr()))
+        });
+        Self { handle, fp }
+    }
+
+    /// Retrieve the number of elements to pass to [`enumerate_physical_device_queue_family_performance_query_counters()`][Self::enumerate_physical_device_queue_family_performance_query_counters()]
+    #[inline]
+    pub unsafe fn enumerate_physical_device_queue_family_performance_query_counters_len(
+        &self,
+        physical_device: vk::PhysicalDevice,
+        queue_family_index: u32,
+    ) -> VkResult<usize> {
+        let mut count = 0;
+        (self
+            .fp
+            .enumerate_physical_device_queue_family_performance_query_counters_khr)(
+            physical_device,
+            queue_family_index,
+            &mut count,
+            ptr::null_mut(),
+            ptr::null_mut(),
+        )
+        .result_with_success(count as usize)
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkEnumeratePhysicalDeviceQueueFamilyPerformanceQueryCountersKHR.html>
+    ///
+    /// Call [`enumerate_physical_device_queue_family_performance_query_counters_len()`][Self::enumerate_physical_device_queue_family_performance_query_counters_len()] to query the number of elements to pass to `out_counters` and `out_counter_descriptions`.
+    /// Be sure to [`Default::default()`]-initialize these elements and optionally set their `p_next` pointer.
+    #[inline]
+    pub unsafe fn enumerate_physical_device_queue_family_performance_query_counters(
+        &self,
+        physical_device: vk::PhysicalDevice,
+        queue_family_index: u32,
+        out_counters: &mut [vk::PerformanceCounterKHR],
+        out_counter_descriptions: &mut [vk::PerformanceCounterDescriptionKHR],
+    ) -> VkResult<()> {
+        assert_eq!(out_counters.len(), out_counter_descriptions.len());
+        let mut count = out_counters.len() as u32;
+        (self
+            .fp
+            .enumerate_physical_device_queue_family_performance_query_counters_khr)(
+            physical_device,
+            queue_family_index,
+            &mut count,
+            out_counters.as_mut_ptr(),
+            out_counter_descriptions.as_mut_ptr(),
+        )
+        .result()?;
+        assert_eq!(count as usize, out_counters.len());
+        assert_eq!(count as usize, out_counter_descriptions.len());
+        Ok(())
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkGetPhysicalDeviceQueueFamilyPerformanceQueryPassesKHR.html>
+    #[inline]
+    pub unsafe fn get_physical_device_queue_family_performance_query_passes(
+        &self,
+        physical_device: vk::PhysicalDevice,
+        performance_query_create_info: &vk::QueryPoolPerformanceCreateInfoKHR,
+    ) -> u32 {
+        let mut num_passes = 0;
+        (self
+            .fp
+            .get_physical_device_queue_family_performance_query_passes_khr)(
+            physical_device,
+            performance_query_create_info,
+            &mut num_passes,
+        );
+        num_passes
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkAcquireProfilingLockKHR.html>
+    #[inline]
+    pub unsafe fn acquire_profiling_lock(
+        &self,
+        device: vk::Device,
+        info: &vk::AcquireProfilingLockInfoKHR,
+    ) -> VkResult<()> {
+        (self.fp.acquire_profiling_lock_khr)(device, info).result()
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkReleaseProfilingLockKHR.html>
+    #[inline]
+    pub unsafe fn release_profiling_lock(&self, device: vk::Device) {
+        (self.fp.release_profiling_lock_khr)(device)
+    }
+
+    pub const NAME: &'static CStr = vk::KhrPerformanceQueryFn::NAME;
+
+    #[inline]
+    pub fn fp(&self) -> &vk::KhrPerformanceQueryFn {
+        &self.fp
+    }
+
+    #[inline]
+    pub fn instance(&self) -> vk::Instance {
+        self.handle
+    }
+}