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//! Utility structs & functions
use anyhow::Result;
/// Keeps a given resource for each swapchain image
pub struct TargetSpecificResources<T> {
elements: Vec<T>,
next_idx: usize,
}
impl<T> TargetSpecificResources<T> {
/// Create a new set of resources, given a function to generate them and the count
/// In most cases, count should be swapchain_properties.image_count
pub fn new<F>(mut generator: F, count: usize) -> Result<Self>
where
F: FnMut() -> Result<T>,
{
let mut elements = Vec::with_capacity(count);
for _ in 0..count {
elements.push(generator()?);
}
Ok(TargetSpecificResources {
elements,
next_idx: 0,
})
}
/// Get the next resource, wrapping around if necessary.
pub fn get_next<'a>(&'a mut self) -> &'a T {
let el = &self.elements[self.next_idx];
self.next_idx = (self.next_idx + 1) % self.elements.len();
el
}
/// Dissolve the resource set, returning an iterator over each item.
/// In most cases, each item will need deactivated.
pub fn dissolve(self) -> impl Iterator<Item = T> {
self.elements.into_iter()
}
}
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