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|
//! A buffer that can be written to by the CPU using staging memory
use super::{create_buffer, ModifiableBuffer};
use crate::types::*;
use core::mem::{size_of, ManuallyDrop};
use std::{
convert::TryInto,
ops::{Index, IndexMut},
};
use anyhow::{Context, Result};
use hal::{
buffer::Usage,
command::BufferCopy,
memory::{Properties, Segment},
};
/// A GPU buffer that is written to using a staging buffer
pub struct StagedBuffer<'a, T: Sized> {
/// CPU-visible buffer
staged_buffer: ManuallyDrop<BufferT>,
/// CPU-visible memory
staged_memory: ManuallyDrop<MemoryT>,
/// GPU Buffer
buffer: ManuallyDrop<BufferT>,
/// GPU Memory
memory: ManuallyDrop<MemoryT>,
/// Where staged buffer is mapped in CPU memory
staged_mapped_memory: &'a mut [T],
/// The highest index in the buffer that's been written to.
pub highest_used: usize,
}
impl<'a, T: Sized> StagedBuffer<'a, T> {
/// size is the size in T
pub fn new(device: &mut DeviceT, adapter: &Adapter, usage: Usage, size: u64) -> Result<Self> {
// Convert size to bytes
let size_bytes = size * size_of::<T>() as u64;
// Get CPU-visible buffer
let (staged_buffer, mut staged_memory) = create_buffer(
device,
adapter,
Usage::TRANSFER_SRC,
Properties::CPU_VISIBLE,
size_bytes,
)
.context("Error creating staging buffer")?;
// Get GPU Buffer
let (buffer, memory) = create_buffer(
device,
adapter,
Usage::TRANSFER_DST | usage,
Properties::DEVICE_LOCAL | Properties::COHERENT,
size_bytes,
)
.context("Error creating GPU buffer")?;
// Map it somewhere and get a slice to that memory
let staged_mapped_memory = unsafe {
let ptr = device
.map_memory(
&mut staged_memory,
Segment {
offset: 0,
size: Some(size_bytes),
},
)
.context("Error mapping staged memory")?;
std::slice::from_raw_parts_mut(ptr as *mut T, size.try_into()?)
};
Ok(StagedBuffer {
staged_buffer: ManuallyDrop::new(staged_buffer),
staged_memory: ManuallyDrop::new(staged_memory),
buffer: ManuallyDrop::new(buffer),
memory: ManuallyDrop::new(memory),
staged_mapped_memory,
highest_used: 0,
})
}
/// Call this before dropping
pub(crate) fn deactivate(mut self, device: &mut DeviceT) {
unsafe {
device.unmap_memory(&mut self.staged_memory);
device.free_memory(ManuallyDrop::take(&mut self.staged_memory));
device.destroy_buffer(ManuallyDrop::take(&mut self.staged_buffer));
device.free_memory(ManuallyDrop::take(&mut self.memory));
device.destroy_buffer(ManuallyDrop::take(&mut self.buffer));
};
}
}
impl<'a, T: Sized> ModifiableBuffer for StagedBuffer<'a, T> {
fn get_buffer(&mut self) -> &BufferT {
&self.buffer
}
fn record_commit_cmds(&mut self, buf: &mut CommandBufferT) -> Result<()> {
unsafe {
buf.copy_buffer(
&self.staged_buffer,
&self.buffer,
std::iter::once(BufferCopy {
src: 0,
dst: 0,
size: ((self.highest_used + 1) * size_of::<T>()) as u64,
}),
);
}
Ok(())
}
}
impl<'a, T: Sized> Index<usize> for StagedBuffer<'a, T> {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
&self.staged_mapped_memory[index]
}
}
impl<'a, T: Sized> IndexMut<usize> for StagedBuffer<'a, T> {
fn index_mut(&mut self, index: usize) -> &mut Self::Output {
if index > self.highest_used {
self.highest_used = index;
}
&mut self.staged_mapped_memory[index]
}
}
|
