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mod belt;
mod device;
mod encoder;
mod indirect;
mod init;
use std::ops::{Add, Rem, Sub};
use std::sync::Arc;
use std::{
borrow::Cow,
mem::{align_of, size_of},
ptr::copy_nonoverlapping,
};
pub use belt::StagingBelt;
pub use device::{BufferInitDescriptor, DeviceExt};
pub use encoder::RenderEncoder;
pub use indirect::*;
pub use init::*;
#[cfg(feature = "spirv")]
pub fn make_spirv(data: &[u8]) -> super::ShaderSource {
super::ShaderSource::SpirV(make_spirv_raw(data))
}
pub fn make_spirv_raw(data: &[u8]) -> Cow<[u32]> {
const MAGIC_NUMBER: u32 = 0x0723_0203;
assert_eq!(
data.len() % size_of::<u32>(),
0,
"data size is not a multiple of 4"
);
let words = if data.as_ptr().align_offset(align_of::<u32>()) == 0 {
let (pre, words, post) = unsafe { data.align_to::<u32>() };
debug_assert!(pre.is_empty());
debug_assert!(post.is_empty());
Cow::from(words)
} else {
let mut words = vec![0u32; data.len() / size_of::<u32>()];
unsafe {
copy_nonoverlapping(data.as_ptr(), words.as_mut_ptr() as *mut u8, data.len());
}
Cow::from(words)
};
assert_eq!(
words[0], MAGIC_NUMBER,
"wrong magic word {:x}. Make sure you are using a binary SPIRV file.",
words[0]
);
words
}
pub struct DownloadBuffer(Arc<super::Buffer>, super::BufferMappedRange);
impl DownloadBuffer {
pub fn read_buffer(
device: &super::Device,
queue: &super::Queue,
buffer: &super::BufferSlice,
callback: impl FnOnce(Result<Self, super::BufferAsyncError>) + Send + 'static,
) {
let size = match buffer.size {
Some(size) => size.into(),
None => buffer.buffer.map_context.lock().total_size - buffer.offset,
};
let download = Arc::new(device.create_buffer(&super::BufferDescriptor {
size,
usage: super::BufferUsages::COPY_DST | super::BufferUsages::MAP_READ,
mapped_at_creation: false,
label: None,
}));
let mut encoder =
device.create_command_encoder(&super::CommandEncoderDescriptor { label: None });
encoder.copy_buffer_to_buffer(buffer.buffer, buffer.offset, &download, 0, size);
let command_buffer: super::CommandBuffer = encoder.finish();
queue.submit(Some(command_buffer));
download
.clone()
.slice(..)
.map_async(super::MapMode::Read, move |result| {
if let Err(e) = result {
callback(Err(e));
return;
}
let mapped_range = super::Context::buffer_get_mapped_range(
&*download.context,
&download.id,
0..size,
);
callback(Ok(Self(download, mapped_range)));
});
}
}
impl std::ops::Deref for DownloadBuffer {
type Target = [u8];
fn deref(&self) -> &[u8] {
super::BufferMappedRangeSlice::slice(&self.1)
}
}
pub fn align_to<T>(value: T, alignment: T) -> T
where
T: Add<Output = T> + Copy + Default + PartialEq<T> + Rem<Output = T> + Sub<Output = T>,
{
let remainder = value % alignment;
if remainder == T::default() {
value
} else {
value + alignment - remainder
}
}