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Update DESIGN.md

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tomaka 2015-11-01 12:01:41 +01:00
parent ed5b012ff7
commit 54b3e1025d
1 changed files with 6 additions and 3 deletions
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DESIGN.md
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@ -267,17 +267,20 @@ let mut buffer = AccessBuffer::cpu_accessible_with_data(&device, &data);
Using the DMA to copy:
```rust
let local_buffer = AccessBuffer::pinned_memory_with_data(&device, &data);
let remote_buffer = Buffer::empty(&device, std::mem::size_of_val(&data));
let local_buffer = RwGpuAccess::new(AccessBuffer::pinned_memory_with_data(&device, &data));
let remote_buffer = RwGpuAccess::new(Buffer::empty(&device, std::mem::size_of_val(&data)));
let dma_queue = device.dma_queues().next().unwrap();
let command_buffer = CommandBufferBuilder::once(&device) // `once` optimizes for buffers that trigger once
.copy_buffer(&local_buffer, &remote_buffer)
.build();
dma_queue.submit(&command_buffer);
let fence = dma_queue.submit(&command_buffer);
assert!(local_buffer.try_write().is_none()); // buffer is in use, we can't access it because of safety
assert!(local_buffer.try_read().is_some()); // however we can read its content
// dropping the fence blocks until the fence is fulfilled
drop(fence);
```
### Hello triangle