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use descriptor::descriptor::DescriptorDesc;
use descriptor::descriptor::DescriptorDescTy;
use descriptor::descriptor::DescriptorBufferDesc;
use descriptor::pipeline_layout::PipelineLayoutDesc;
use descriptor::pipeline_layout::PipelineLayoutDescPcRange;
use fnv::FnvHashSet;
pub struct PipelineLayoutDescTweaks<T> {
inner: T,
dynamic_buffers: FnvHashSet<(usize, usize)>,
}
impl<T> PipelineLayoutDescTweaks<T>
where T: PipelineLayoutDesc
{
pub fn new<I>(inner: T, dynamic_buffers: I) -> Self
where I: IntoIterator<Item=(usize, usize)>
{
let dynamic_buffers = dynamic_buffers.into_iter().collect();
for &(set, binding) in &dynamic_buffers {
debug_assert!(inner.descriptor(set, binding)
.map_or(false, |desc| match desc.ty {
DescriptorDescTy::Buffer(_) => true,
_ => false,
}),
"tried to make the non-buffer descriptor at set {} binding {} a dynamic buffer", set, binding);
}
Self { inner, dynamic_buffers }
}
}
unsafe impl<T> PipelineLayoutDesc for PipelineLayoutDescTweaks<T>
where T: PipelineLayoutDesc
{
#[inline]
fn num_sets(&self) -> usize { self.inner.num_sets() }
#[inline]
fn num_bindings_in_set(&self, set: usize) -> Option<usize> { self.inner.num_bindings_in_set(set) }
#[inline]
fn descriptor(&self, set: usize, binding: usize) -> Option<DescriptorDesc> {
self.inner.descriptor(set, binding).map(|desc| {
match desc.ty {
DescriptorDescTy::Buffer(ref buffer_desc) if self.dynamic_buffers.contains(&(set, binding)) => {
DescriptorDesc {
ty: DescriptorDescTy::Buffer(DescriptorBufferDesc {
dynamic: Some(true),
..*buffer_desc
}),
..desc
}
}
_ => desc,
}
})
}
#[inline]
fn num_push_constants_ranges(&self) -> usize { self.inner.num_push_constants_ranges() }
#[inline]
fn push_constants_range(&self, num: usize) -> Option<PipelineLayoutDescPcRange> { self.inner.push_constants_range(num) }
}