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belt.rs
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belt.rs
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struct ReusableBuffer {
raw: blade::Buffer,
size: u64,
}
pub struct BeltDescriptor {
pub memory: blade::Memory,
pub min_chunk_size: u64,
}
pub struct BufferBelt {
desc: BeltDescriptor,
buffers: Vec<(ReusableBuffer, blade::SyncPoint)>,
active: Vec<(ReusableBuffer, u64)>,
}
impl BufferBelt {
pub fn new(desc: BeltDescriptor) -> Self {
Self {
desc,
buffers: Vec::new(),
active: Vec::new(),
}
}
pub fn delete(self, context: &blade::Context) {
for (buffer, _) in self.buffers {
context.destroy_buffer(buffer.raw);
}
for (buffer, _) in self.active {
context.destroy_buffer(buffer.raw);
}
}
pub fn alloc(&mut self, size: u64, context: &blade::Context) -> blade::BufferPiece {
for &mut (ref rb, ref mut offset) in self.active.iter_mut() {
if *offset + size <= rb.size {
let piece = rb.raw.at(*offset);
*offset += size;
return piece;
}
}
let index_maybe = self
.buffers
.iter()
.position(|&(ref rb, ref sp)| size <= rb.size && context.wait_for(sp, 0));
if let Some(index) = index_maybe {
let (rb, _) = self.buffers.remove(index);
let piece = rb.raw.into();
self.active.push((rb, size));
return piece;
}
let chunk_index = self.buffers.len() + self.active.len();
let chunk_size = size.max(self.desc.min_chunk_size);
let chunk = context.create_buffer(blade::BufferDesc {
name: &format!("chunk-{}", chunk_index),
size: chunk_size,
memory: self.desc.memory,
});
let rb = ReusableBuffer {
raw: chunk,
size: chunk_size,
};
self.active.push((rb, size));
chunk.into()
}
pub fn alloc_data<T: bytemuck::Pod>(
&mut self,
data: &[T],
context: &blade::Context,
) -> blade::BufferPiece {
let bp = self.alloc((data.len() * std::mem::size_of::<T>()) as u64, context);
unsafe {
std::ptr::copy_nonoverlapping(data.as_ptr(), bp.data() as *mut T, data.len());
}
bp
}
pub fn flush(&mut self, sp: blade::SyncPoint) {
self.buffers
.extend(self.active.drain(..).map(|(rb, _)| (rb, sp.clone())));
}
}