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Add the static lifetime bound to async buffer mapping callbacks

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These callbacks are executed outside of the mapping function and could
previously reference data that had been dropped. This fixes the
soundness issues described in #95, but not the buggy mapping
behavior.
This commit is contained in:
Aaron Loucks 2019-03-09 13:56:32 -05:00
parent 0bb4daa696
commit 86e1249949
2 changed files with 6 additions and 3 deletions
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5
examples/hello_compute_rust/main.rs
View File

@ -88,13 +88,16 @@ fn main() {
}
encoder.copy_buffer_to_buffer(&storage_buffer, 0, &staging_buffer, 0, size);
device.get_queue().submit(&[encoder.finish()]);
staging_buffer.map_read_async(0, size, |result: wgpu::BufferMapAsyncResult<&[u32]>| {
if let wgpu::BufferMapAsyncResult::Success(data) = result {
println!("Times: {:?}", data);
}
staging_buffer.unmap();
// staging_buffer.unmap(); // TODO
});
let encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor { todo: 0 });
device.get_queue().submit(&[encoder.finish()]);
}

4
wgpu-rs/src/lib.rs
View File

@ -530,7 +530,7 @@ impl Buffer {
pub fn map_read_async<T, F>(&self, start: u32, size: u32, callback: F)
where
T: 'static + Copy,
F: FnOnce(BufferMapAsyncResult<&[T]>),
F: FnOnce(BufferMapAsyncResult<&[T]>) + 'static,
{
let type_size = std::mem::size_of::<T>() as u32;
assert_ne!(type_size, 0);
@ -575,7 +575,7 @@ impl Buffer {
pub fn map_write_async<T, F>(&self, start: u32, size: u32, callback: F)
where
T: 'static + Copy,
F: FnOnce(BufferMapAsyncResult<&mut [T]>),
F: FnOnce(BufferMapAsyncResult<&mut [T]>) + 'static,
{
let type_size = std::mem::size_of::<T>() as u32;
assert_ne!(type_size, 0);