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[hal/vulkan] Don't advertise features without prerequisites present.

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Don't advertise features like `STORAGE_RESOURCE_BINDING_ARRAY` unless
at least one of the features it extends, like `BUFFER_BINDING_ARRAY`
or `TEXTURE_BINDING_ARRAY`, is actually present.

See the comments on `PhysicalDevicefeatures::prequisites_satisfied`
for more details.
This commit is contained in:
Jim Blandy 2024-03-30 16:52:31 -07:00
parent 18f721561a
commit f4b5abf0c8
1 changed files with 33 additions and 7 deletions
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40
wgpu-hal/src/vulkan/adapter.rs
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@ -510,7 +510,7 @@ impl PhysicalDeviceFeatures {
self.core.shader_sampled_image_array_dynamic_indexing != 0,
);
features.set(F::SHADER_PRIMITIVE_INDEX, self.core.geometry_shader != 0);
if Self::all_features_supported(
if Self::prerequisites_satisfied(
&features,
&[
(
@ -547,7 +547,7 @@ impl PhysicalDeviceFeatures {
if let Some(ref descriptor_indexing) = self.descriptor_indexing {
const STORAGE: F = F::STORAGE_RESOURCE_BINDING_ARRAY;
if Self::all_features_supported(
if Self::prerequisites_satisfied(
&features,
&[
(
@ -562,7 +562,7 @@ impl PhysicalDeviceFeatures {
) {
features.insert(F::SAMPLED_TEXTURE_AND_STORAGE_BUFFER_ARRAY_NON_UNIFORM_INDEXING);
}
if Self::all_features_supported(
if Self::prerequisites_satisfied(
&features,
&[
(
@ -689,13 +689,39 @@ impl PhysicalDeviceFeatures {
(features, dl_flags)
}
fn all_features_supported(
/// Check whether the Vulkan features needed for a wgpu [`Features`] flag are present.
///
/// Some wgpu `Features` flags describe an extension to multiple other
/// flags. For example, [`STORAGE_RESOURCE_BINDING_ARRAY`] says that if
/// [`BUFFER_BINDING_ARRAY`] or [`TEXTURE_BINDING_ARRAY`] is present, then
/// those arrays can, furthermore, be dynamically indexed. For each of the
/// basic `Features` flags, a specific set of Vulkan features must be
/// available for the extending flag to be available.
///
/// Given `features`, the set of [`Features`] already discovered, check if:
/// - some `Features` set in `implications` is present, and
/// - for any set that is present, the corresponding Vulkan features
/// (evaluated by the caller and passed as a bool) are available.
///
/// [`Features`]: wgt::Features
/// [`STORAGE_RESOURCE_BINDING_ARRAY`]: wgt::Features::STORAGE_RESOURCE_BINDING_ARRAY
/// [`BUFFER_BINDING_ARRAY`]: wgt::Features::BUFFER_BINDING_ARRAY
/// [`TEXTURE_BINDING_ARRAY`]: wgt::Features::TEXTURE_BINDING_ARRAY
fn prerequisites_satisfied(
features: &wgt::Features,
implications: &[(wgt::Features, vk::Bool32)],
) -> bool {
implications
.iter()
.all(|&(flag, support)| !features.contains(flag) || support != 0)
// This is both a conjunction (all the implications must be true) and a
// disjunction (at least one of them must have its antecedent
// satisfied), so the `Iterator` adapters don't clarify very much.
let mut any = false;
for &(wgpu_base_feature, vulkan_support) in implications.iter() {
if features.contains(wgpu_base_feature) && vulkan_support == 0 {
return false;
}
any = true;
}
any
}
}