From c2f21d29495c0bccbc650b456825e6336ca08739 Mon Sep 17 00:00:00 2001
From: BeastLe9enD <beastle9end@outlook.de>
Date: Mon, 26 Sep 2022 00:31:28 +0200
Subject: [PATCH] extensions/ext: Add VK_EXT_mesh_shader (#657)

---
 Changelog.md                          |  1 +
 ash/src/extensions/ext/mesh_shader.rs | 94 +++++++++++++++++++++++++++
 ash/src/extensions/ext/mod.rs         |  2 +
 3 files changed, 97 insertions(+)
 create mode 100644 ash/src/extensions/ext/mesh_shader.rs

diff --git a/Changelog.md b/Changelog.md
index 938c87f..cc8bfd3 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added new functions to `VK_KHR_swapchain`, available since Vulkan 1.1 (#629)
 - Added `VK_KHR_device_group_creation` instance extension (#630)
 - Added `VK_KHR_device_group` device extension (#631)
+- Added `VK_EXT_mesh_shader` device extension (#657)
 
 
 ### Fixed
diff --git a/ash/src/extensions/ext/mesh_shader.rs b/ash/src/extensions/ext/mesh_shader.rs
new file mode 100644
index 0000000..7d58f0c
--- /dev/null
+++ b/ash/src/extensions/ext/mesh_shader.rs
@@ -0,0 +1,94 @@
+use crate::vk;
+use crate::{Device, Instance};
+use std::ffi::CStr;
+use std::mem;
+
+/// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VK_EXT_mesh_shader.html>
+#[derive(Clone)]
+pub struct MeshShader {
+    fp: vk::ExtMeshShaderFn,
+}
+
+impl MeshShader {
+    pub fn new(instance: &Instance, device: &Device) -> Self {
+        let fp = vk::ExtMeshShaderFn::load(|name| unsafe {
+            mem::transmute(instance.get_device_proc_addr(device.handle(), name.as_ptr()))
+        });
+        Self { fp }
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkCmdDrawMeshTasksEXT.html>
+    #[inline]
+    pub unsafe fn cmd_draw_mesh_tasks(
+        &self,
+        command_buffer: vk::CommandBuffer,
+        group_count_x: u32,
+        group_count_y: u32,
+        group_count_z: u32,
+    ) {
+        (self.fp.cmd_draw_mesh_tasks_ext)(
+            command_buffer,
+            group_count_x,
+            group_count_y,
+            group_count_z,
+        );
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkCmdDrawMeshTasksIndirectEXT.html>
+    ///
+    /// `buffer` contains `draw_count` [`vk::DrawMeshTasksIndirectCommandEXT`] structures starting at `offset` in bytes, holding the draw parameters.
+    #[inline]
+    pub unsafe fn cmd_draw_mesh_tasks_indirect(
+        &self,
+        command_buffer: vk::CommandBuffer,
+        buffer: vk::Buffer,
+        offset: vk::DeviceSize,
+        draw_count: u32,
+        stride: u32,
+    ) {
+        (self.fp.cmd_draw_mesh_tasks_indirect_ext)(
+            command_buffer,
+            buffer,
+            offset,
+            draw_count,
+            stride,
+        );
+    }
+
+    /// <https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/vkCmdDrawMeshTasksIndirectCountEXT.html>
+    ///
+    /// `buffer` contains a maximum of `max_draw_count` [`vk::DrawMeshTasksIndirectCommandEXT`] structures starting at `offset` in bytes, holding the draw parameters.
+    /// `count_buffer` is the buffer containing the draw count, starting at `count_buffer_offset` in bytes.
+    /// The actual number of executed draw calls is the minimum of the count specified in `count_buffer` and `max_draw_count`.
+    #[inline]
+    pub unsafe fn cmd_draw_mesh_tasks_indirect_count(
+        &self,
+        command_buffer: vk::CommandBuffer,
+        buffer: vk::Buffer,
+        offset: vk::DeviceSize,
+        count_buffer: vk::Buffer,
+        count_buffer_offset: vk::DeviceSize,
+        max_draw_count: u32,
+        stride: u32,
+    ) {
+        (self.fp.cmd_draw_mesh_tasks_indirect_count_ext)(
+            command_buffer,
+            buffer,
+            offset,
+            count_buffer,
+            count_buffer_offset,
+            max_draw_count,
+            stride,
+        );
+    }
+
+    #[inline]
+    pub const fn name() -> &'static CStr {
+        vk::ExtMeshShaderFn::name()
+    }
+
+    #[inline]
+    pub fn fp(&self) -> &vk::ExtMeshShaderFn {
+        &self.fp
+    }
+}
diff --git a/ash/src/extensions/ext/mod.rs b/ash/src/extensions/ext/mod.rs
index 477eb81..93fca2f 100644
--- a/ash/src/extensions/ext/mod.rs
+++ b/ash/src/extensions/ext/mod.rs
@@ -11,6 +11,7 @@ pub use self::full_screen_exclusive::FullScreenExclusive;
 pub use self::headless_surface::HeadlessSurface;
 pub use self::image_compression_control::ImageCompressionControl;
 pub use self::image_drm_format_modifier::ImageDrmFormatModifier;
+pub use self::mesh_shader::MeshShader;
 pub use self::metal_surface::MetalSurface;
 pub use self::physical_device_drm::PhysicalDeviceDrm;
 pub use self::private_data::PrivateData;
@@ -30,6 +31,7 @@ mod full_screen_exclusive;
 mod headless_surface;
 mod image_compression_control;
 mod image_drm_format_modifier;
+mod mesh_shader;
 mod metal_surface;
 mod physical_device_drm;
 mod private_data;