images+commands: sync

- lock pool when allocating command buffers
- store image parent as weak arc in order to not create cycles

crates/renderer/src/commands.rs

@@ -64,6 +64,7 @@ impl SingleUseCommandPool {
     }
 
     /// get the underlying pool, bypassing the mutex
+    #[allow(dead_code)]
     pub unsafe fn pool(&self) -> vk::CommandPool {
         self.pool.data_ptr().read()
     }
@@ -129,6 +130,8 @@ pub enum CommandBufferState {
 #[derive(Debug)]
 #[repr(transparent)]
 struct CommandBufferState2(AtomicU8);
+
+#[allow(dead_code)]
 impl CommandBufferState2 {
     fn initial() -> Self {
         Self(AtomicU8::new(CommandBufferState::Initial as u8))
@@ -188,11 +191,13 @@ impl !Sync for SingleUseCommand {}
 impl SingleUseCommand {
     pub fn new(device: Device, pool: Arc<SingleUseCommandPool>) -> VkResult<Self> {
         let buffer = unsafe {
+            let buffer = pool.pool.with_locked(|pool| {
                 let alloc_info = vk::CommandBufferAllocateInfo::default()
                     .command_buffer_count(1)
-                .command_pool(pool.pool())
+                    .command_pool(*pool)
                     .level(vk::CommandBufferLevel::PRIMARY);
-            let buffer = device.dev().allocate_command_buffers(&alloc_info)?[0];
+                Ok(device.dev().allocate_command_buffers(&alloc_info)?[0])
+            })?;
 
             device.dev().begin_command_buffer(
                 buffer,

crates/renderer/src/images.rs

@@ -1,4 +1,8 @@
-use std::{borrow::Cow, collections::HashMap, sync::Arc};
+use std::{
+    borrow::Cow,
+    collections::HashMap,
+    sync::{Arc, Weak},
+};
 
 use crate::{
     define_device_owned_handle,
@@ -128,7 +132,7 @@ define_device_owned_handle! {
         format: vk::Format,
         views: Mutex<HashMap<ImageViewDesc, vk::ImageView>>,
         aliases: Mutex<HashMap<ImageDesc, Arc<Image>>>,
-        parent: Option<Arc<Image>>,
+        parent: Option<Weak<Image>>,
         is_swapchain_image: bool,
     } => |this| if !this.is_swapchain_image {
         unsafe {
@@ -266,20 +270,19 @@ impl Image {
         self.size.depth
     }
 
-    fn get_parent(self: &Arc<Self>) -> Arc<Image> {
-        self.parent.clone().unwrap_or_else(|| self.clone())
-    }
-
-    fn get_alloc(&self) -> Option<&vk_mem::Allocation> {
-        self.alloc
+    fn get_parent_or_self(self: &Arc<Self>) -> Arc<Image> {
+        self.parent
             .as_ref()
-            .or(self.parent.as_ref().and_then(|image| image.get_alloc()))
+            .map(|weak| weak.upgrade().unwrap())
+            .unwrap_or_else(|| self.clone())
     }
 
     pub unsafe fn get_alias(self: &Arc<Self>, desc: ImageDesc) -> VkResult<Arc<Self>> {
-        self.get_parent().get_alias_inner(desc)
+        self.get_parent_or_self().get_alias_inner(desc)
     }
 
+    /// must only be called on the primogenitor of an image.
+    /// get the primogenitor with [`Self::get_parent_or_self()`]
     unsafe fn get_alias_inner(self: Arc<Self>, desc: ImageDesc) -> VkResult<Arc<Image>> {
         use std::collections::hash_map::Entry::*;
         match self.aliases.lock().entry(desc.clone()) {
@@ -327,7 +330,8 @@ impl Image {
                     .mip_levels(mip_levels);
 
                 let alloc = self
-                    .get_alloc()
+                    .alloc
+                    .as_ref()
                     .expect("no alloc associated with image. is this the framebuffer?");
 
                 let image = unsafe {
@@ -342,7 +346,6 @@ impl Image {
                     image
                 };
 
-                let parent = self.parent.clone().unwrap_or(self.clone());
                 let alias = Self::construct(
                     self.device().clone(),
                     image,
@@ -352,8 +355,8 @@ impl Image {
                     format,
                     Mutex::new(HashMap::new()),
                     Mutex::new(HashMap::new()),
-                    Some(parent.clone()),
-                    parent.is_swapchain_image,
+                    Some(Arc::downgrade(&self)),
+                    self.is_swapchain_image,
                 )?;
                 Ok(vacant.insert(Arc::new(alias)).clone())
             }