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</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright (c) 2016 The vulkano developers</span>
<span class="comment">// Licensed under the Apache License, Version 2.0</span>
<span class="comment">// <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT</span>
<span class="comment">// license <LICENSE-MIT or http://opensource.org/licenses/MIT>,</span>
<span class="comment">// at your option. All files in the project carrying such</span>
<span class="comment">// notice may not be copied, modified, or distributed except</span>
<span class="comment">// according to those terms.</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ops</span>::<span class="ident">Range</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">buffer</span>::<span class="ident">traits</span>::<span class="ident">BufferAccess</span>;
<span class="kw">use</span> <span class="ident">buffer</span>::<span class="ident">traits</span>::<span class="ident">BufferInner</span>;
<span class="kw">use</span> <span class="ident">buffer</span>::<span class="ident">traits</span>::<span class="ident">TypedBufferAccess</span>;
<span class="kw">use</span> <span class="ident">device</span>::<span class="ident">Device</span>;
<span class="kw">use</span> <span class="ident">device</span>::<span class="ident">DeviceOwned</span>;
<span class="kw">use</span> <span class="ident">device</span>::<span class="ident">Queue</span>;
<span class="kw">use</span> <span class="ident">image</span>::<span class="ident">ImageAccess</span>;
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">AccessError</span>;
<span class="doccomment">/// A subpart of a buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This object doesn't correspond to any Vulkan object. It exists for API convenience.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Creating a slice:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore // FIXME: unignore</span>
<span class="doccomment">/// use vulkano::buffer::BufferSlice;</span>
<span class="doccomment">/// # let buffer: std::sync::Arc<vulkano::buffer::DeviceLocalBuffer<[u8]>> = return;</span>
<span class="doccomment">/// let _slice = BufferSlice::from(&buffer);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Selecting a slice of a buffer that contains `[T]`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore // FIXME: unignore</span>
<span class="doccomment">/// use vulkano::buffer::BufferSlice;</span>
<span class="doccomment">/// # let buffer: std::sync::Arc<vulkano::buffer::DeviceLocalBuffer<[u8]>> = return;</span>
<span class="doccomment">/// let _slice = BufferSlice::from(&buffer).slice(12 .. 14).unwrap();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">resource</span>: <span class="ident">B</span>,
<span class="ident">offset</span>: <span class="ident">usize</span>,
<span class="ident">size</span>: <span class="ident">usize</span>,
}
<span class="comment">// We need to implement `Clone` manually, otherwise the derive adds a `T: Clone` requirement.</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">B</span>: <span class="ident">Clone</span>
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">clone</span>(),
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span>,
<span class="ident">size</span>: <span class="self">self</span>.<span class="ident">size</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_typed_buffer_access</span>(<span class="ident">r</span>: <span class="ident">B</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">B</span>: <span class="ident">TypedBufferAccess</span><span class="op"><</span><span class="ident">Content</span> <span class="op">=</span> <span class="ident">T</span><span class="op">></span>
{
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">r</span>.<span class="ident">size</span>();
<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="ident">r</span>,
<span class="ident">offset</span>: <span class="number">0</span>,
<span class="ident">size</span>: <span class="ident">size</span>,
}
}
<span class="doccomment">/// Returns the buffer that this slice belongs to.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">buffer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">B</span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">resource</span>
}
<span class="doccomment">/// Returns the offset of that slice within the buffer.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">offset</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">offset</span>
}
<span class="doccomment">/// Returns the size of that slice in bytes.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">size</span>
}
<span class="doccomment">/// Builds a slice that contains an element from inside the buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method builds an object that represents a slice of the buffer. No actual operation</span>
<span class="doccomment">/// is performed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// TODO</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The object whose reference is passed to the closure is uninitialized. Therefore you</span>
<span class="doccomment">/// **must not** access the content of the object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// You **must** return a reference to an element from the parameter. The closure **must not**</span>
<span class="doccomment">/// panic.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">slice_custom</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">R</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="kw">for</span><span class="op"><</span><span class="lifetime">'r</span><span class="op">></span> <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="lifetime">'r</span> <span class="ident">R</span> <span class="comment">// TODO: bounds on R</span>
{
<span class="kw">let</span> <span class="ident">data</span>: <span class="kw-2">&</span><span class="ident">T</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">zeroed</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">data</span>);
<span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">size_of_val</span>(<span class="ident">result</span>);
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">result</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">R</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> () <span class="kw">as</span> <span class="ident">usize</span>;
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span> <span class="op"><</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">size</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">result</span> <span class="op">+</span> <span class="ident">size</span> <span class="op"><</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">size</span>());
<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="self">self</span>.<span class="ident">resource</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="ident">result</span>,
<span class="ident">size</span>: <span class="ident">size</span>,
}
}
<span class="doccomment">/// Changes the `T` generic parameter of the `BufferSlice` to the desired type. This can be</span>
<span class="doccomment">/// useful when you have a buffer with various types of data and want to create a typed slice</span>
<span class="doccomment">/// of a region that contains a single type of data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::sync::Arc;</span>
<span class="doccomment">/// # use vulkano::buffer::BufferSlice;</span>
<span class="doccomment">/// # use vulkano::buffer::immutable::ImmutableBuffer;</span>
<span class="doccomment">/// # struct VertexImpl;</span>
<span class="doccomment">/// let blob_slice: BufferSlice<[u8], Arc<ImmutableBuffer<[u8]>>> = return;</span>
<span class="doccomment">/// let vertex_slice: BufferSlice<[VertexImpl], Arc<ImmutableBuffer<[u8]>>> = unsafe {</span>
<span class="doccomment">/// blob_slice.reinterpret::<[VertexImpl]>()</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Correct `offset` and `size` must be ensured before using this `BufferSlice` on the device.</span>
<span class="doccomment">/// See `BufferSlice::slice` for adjusting these properties.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">reinterpret</span><span class="op"><</span><span class="ident">R</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">B</span><span class="op">></span>
{
<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="self">self</span>.<span class="ident">resource</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span>,
<span class="ident">size</span>: <span class="self">self</span>.<span class="ident">size</span>,
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">B</span><span class="op">></span> {
<span class="doccomment">/// Returns the number of elements in this slice.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">size</span>() <span class="op">%</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="number">0</span>);
<span class="self">self</span>.<span class="ident">size</span>() <span class="op">/</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()
}
<span class="doccomment">/// Reduces the slice to just one element of the array.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if out of range.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">index</span>(<span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">index</span> <span class="op">></span><span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>() {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="prelude-val">Some</span>(<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="self">self</span>.<span class="ident">resource</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="ident">index</span> <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(),
<span class="ident">size</span>: <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(),
})
}
<span class="doccomment">/// Reduces the slice to just a range of the array.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if out of range.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">slice</span>(<span class="self">self</span>, <span class="ident">range</span>: <span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">BufferSlice</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">B</span><span class="op">></span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">range</span>.<span class="ident">end</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">len</span>() {
<span class="kw">return</span> <span class="prelude-val">None</span>;
}
<span class="prelude-val">Some</span>(<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="self">self</span>.<span class="ident">resource</span>,
<span class="ident">offset</span>: <span class="self">self</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="ident">range</span>.<span class="ident">start</span> <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(),
<span class="ident">size</span>: (<span class="ident">range</span>.<span class="ident">end</span> <span class="op">-</span> <span class="ident">range</span>.<span class="ident">start</span>) <span class="op">*</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(),
})
}
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">BufferAccess</span> <span class="kw">for</span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">B</span>: <span class="ident">BufferAccess</span>
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">inner</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BufferInner</span> {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">inner</span>();
<span class="ident">BufferInner</span> {
<span class="ident">buffer</span>: <span class="ident">inner</span>.<span class="ident">buffer</span>,
<span class="ident">offset</span>: <span class="ident">inner</span>.<span class="ident">offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">offset</span>,
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">size</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">conflicts_buffer</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">dyn</span> <span class="ident">BufferAccess</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">conflicts_buffer</span>(<span class="ident">other</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">conflicts_image</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">dyn</span> <span class="ident">ImageAccess</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">conflicts_image</span>(<span class="ident">other</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">conflict_key</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">u64</span>, <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">conflict_key</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">try_gpu_lock</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">exclusive_access</span>: <span class="ident">bool</span>, <span class="ident">queue</span>: <span class="kw-2">&</span><span class="ident">Queue</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">AccessError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">try_gpu_lock</span>(<span class="ident">exclusive_access</span>, <span class="ident">queue</span>)
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">increase_gpu_lock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">increase_gpu_lock</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unlock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">unlock</span>()
}
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">TypedBufferAccess</span> <span class="kw">for</span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">B</span>: <span class="ident">BufferAccess</span>
{
<span class="kw">type</span> <span class="ident">Content</span> <span class="op">=</span> <span class="ident">T</span>;
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">DeviceOwned</span> <span class="kw">for</span> <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">B</span>: <span class="ident">DeviceOwned</span>
{
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">device</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="kw-2">&</span><span class="ident">Arc</span><span class="op"><</span><span class="ident">Device</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">resource</span>.<span class="ident">device</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span><span class="op">></span> <span class="kw">for</span> <span class="ident">BufferSlice</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">B</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">r</span>: <span class="ident">BufferSlice</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">B</span><span class="op">></span>) <span class="op">-</span><span class="op">></span> <span class="ident">BufferSlice</span><span class="op"><</span>[<span class="ident">T</span>], <span class="ident">B</span><span class="op">></span> {
<span class="ident">BufferSlice</span> {
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
<span class="ident">resource</span>: <span class="ident">r</span>.<span class="ident">resource</span>,
<span class="ident">offset</span>: <span class="ident">r</span>.<span class="ident">offset</span>,
<span class="ident">size</span>: <span class="ident">r</span>.<span class="ident">size</span>,
}
}
}
<span class="doccomment">/// Takes a `BufferSlice` that points to a struct, and returns a `BufferSlice` that points to</span>
<span class="doccomment">/// a specific field of that struct.</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">buffer_slice_field</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">slice</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">ident</span>) <span class="op">=</span><span class="op">></span> (
<span class="comment">// TODO: add #[allow(unsafe_code)] when that's allowed</span>
<span class="kw">unsafe</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">slice</span>.<span class="ident">slice_custom</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">s</span>.<span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>) }
)
}
</pre></div>
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