Expose FramebufferCreateInfo::attachment_count builder for IMAGELESS (#747)

* Expose `FramebufferCreateInfo::attachment_count` builder for `IMAGELESS`

Don't omit the `attachment_count()` builder method, because it is valid
to set the number of attachments without providing attachments in the
`IMAGELESS` case.

Also change the generator array lookup to use the name of the count
field that is allowed to have a builder method, rather than the name of
the field that would use this as `len` field and hence cause it to be
skipped.

* Clean up clones

Changelog.md

@@ -1,4 +1,5 @@
 # Changelog
+
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
@@ -12,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `VK_KHR_performance_query` device extension (#726)
 - Added `VK_EXT_shader_object` device extension (#732)
 - Added missing `Device::get_device_queue2()` wrapper (#736)
+- Exposed `FramebufferCreateInfoBuilder::attachment_count()` builder for `vk::FramebufferCreateFlags::IMAGELESS` (#747)
 
 ## [0.37.2] - 2022-01-11
 
@@ -289,15 +291,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix XCB types
 - Fix OSX build errors of the examples
 
-
 ## Before 0.30.0
 
 ### 0.29.0
+
 - -Breaking-: Removed Display impl for flags. The Debug impl now reports flags by name.
 - Functions now have a doc comment that links to the Vulkan spec
 - Entry has a new method called `try_enumerate_instance_version` which can be used in a 1.0 context.
 - The generator now uses `BTreeMap` for better diffs.
+
 ### 0.28.0
+
 - Switched to a new [changelog](https://keepachangelog.com/en/1.0.0/) format
 - Fixed a build issue on ARM.
 - -Breaking- Arrays are now passed by reference.
@@ -322,6 +326,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Expose function pointers for easier interop with external libraries.
 
 - Builder now uses bool instead of Bool32.
+
 ### 0.25.0
 
 - Adds support for Vulkan 1.1
@@ -353,8 +358,8 @@ flags: vk::CommandPoolCreateFlags::RESET_COMMAND_BUFFER_BIT,
 
 - Various bug fixes
 
-
 ### 0.18.0
+
 - Fixes arm build => uses libc everywhere. Remove `AlignByteSlice`.
 
 ### 0.17.0
@@ -368,7 +373,6 @@ flags: vk::CommandPoolCreateFlags::RESET_COMMAND_BUFFER_BIT,
 - `ash::util::Align` is a helper struct that
 can write to aligned memory.
 
-
 [Unreleased]: https://github.com/MaikKlein/ash/compare/0.37.2...HEAD
 [0.37.2]: https://github.com/MaikKlein/ash/releases/tag/0.37.2
 [0.37.1]: https://github.com/MaikKlein/ash/releases/tag/0.37.1

ash/src/vk/definitions.rs

@@ -10284,6 +10284,11 @@ impl<'a> FramebufferCreateInfoBuilder<'a> {
         self
     }
     #[inline]
+    pub fn attachment_count(mut self, attachment_count: u32) -> Self {
+        self.inner.attachment_count = attachment_count;
+        self
+    }
+    #[inline]
     pub fn attachments(mut self, attachments: &'a [ImageView]) -> Self {
         self.inner.attachment_count = attachments.len() as _;
         self.inner.p_attachments = attachments.as_ptr();

generator/src/lib.rs

@@ -1793,33 +1793,31 @@ pub fn derive_setters(
     // Must either have both, or none:
     assert_eq!(next_field.is_some(), structure_type_field.is_some());
 
-    let nofilter_count_members = [
-        ("VkPipelineViewportStateCreateInfo", "pViewports"),
-        ("VkPipelineViewportStateCreateInfo", "pScissors"),
-        ("VkDescriptorSetLayoutBinding", "pImmutableSamplers"),
+    let allowed_count_members = [
+        // pViewports is allowed to be empty if the viewport state is empty
+        ("VkPipelineViewportStateCreateInfo", "viewportCount"),
+        // Must match viewportCount
+        ("VkPipelineViewportStateCreateInfo", "scissorCount"),
+        // descriptorCount is settable regardless of having pImmutableSamplers
+        ("VkDescriptorSetLayoutBinding", "descriptorCount"),
+        // No ImageView attachments when VK_FRAMEBUFFER_CREATE_IMAGELESS_BIT is set
+        ("VkFramebufferCreateInfo", "attachmentCount"),
     ];
-    let filter_members: Vec<String> = members
+    let filter_members = members
         .iter()
         .filter_map(|(field, _)| {
-            let field_name = field.name.as_ref().unwrap();
-
             // Associated _count members
             if field.array.is_some() {
-                if let Some(ref array_size) = field.size {
-                    if !nofilter_count_members.contains(&(&struct_.name, field_name)) {
-                        return Some((*array_size).clone());
+                if let Some(array_size) = &field.size {
+                    if !allowed_count_members.contains(&(&struct_.name, array_size)) {
+                        return Some(array_size);
                     }
                 }
             }
 
-            // VkShaderModuleCreateInfo requires a custom setter
-            if field_name == "codeSize" {
-                return Some(field_name.clone());
-            }
-
             None
         })
-        .collect();
+        .collect::<Vec<_>>();
 
     let setters = members.iter().filter_map(|(field, deprecated)| {
         let deprecated = deprecated.as_ref().map(|d| quote!(#d #[allow(deprecated)]));
@@ -1838,12 +1836,15 @@ pub fn derive_setters(
         let mut param_ident_short = format_ident!("{}", param_ident_short);
 
         if let Some(name) = field.name.as_ref() {
-            // Filter
-            if filter_members.iter().any(|n| *n == *name) {
+            if filter_members.contains(&name) {
                 return None;
             }
 
             // Unique cases
+            if struct_.name == "VkShaderModuleCreateInfo" && name == "codeSize" {
+                return None;
+            }
+
             if struct_.name == "VkShaderModuleCreateInfo" && name == "pCode" {
                 return Some(quote!{
                     #[inline]