Struct DeviceMemory

pub struct DeviceMemory { /* private fields */ }

A region of device memory.

Destruction

Dropping this DeviceMemory will cause Device::free_memory to be called, automatically releasing any resources associated with it.

Implementations

impl DeviceMemory

pub fn builder<'b>() -> DeviceMemoryBuilder<'b>

Returns a new DeviceMemoryBuilder.

pub fn new( device: Device, allocation_size: u64, memory_type_index: u32, ) -> VdResult<DeviceMemory>

Returns a new DeviceMemory.

pub unsafe fn map_to_ptr<T>( &self, offset_bytes: u64, size_bytes: u64, flags: MemoryMapFlags, ) -> VdResult<*mut T>

Maps a region of this memory object to a pointer.

Use ::unmap_ptr to unmap this memory.

The flags argument is reserved for future use and is ignored.

pub unsafe fn unmap_ptr(&self)

Unmaps memory.

Do not use this unless memory was mapped using ::map_to_ptr.

Use ::unmap to unmap memory mapped by ::map.

pub unsafe fn map<'m, T>( &'m self, offset_bytes: u64, size_bytes: u64, flags: MemoryMapFlags, ) -> VdResult<MemoryMapping<'m, T>>

Maps a region of memory and returns a mutable reference to it.

Use ::unmap to unmap.

Use ::copy_from_slice on the returned slice to easily copy data into the mapped memory.

Example

let mut mem = self.uniform_buffer_memory.map(0, ubo_bytes, 0)?;
mem.copy_from_slice(&[ubo]);
self.uniform_buffer_memory.unmap(mem);

Note/Reminder: The above example uses a dedicated buffer and memory allocation for demonstration purposes. It is best practice to allocate all memory from one large buffer and use offsets to specify particular parts.

The flags argument is reserved for future use and is ignored.

Safety

The caller must ensure that care is taken when mapping a buffer multiple times simultaneously. Use an appropriate synchronization mechanism such as a std::sync::atomic::AtomicBool (in the simplest case) to help coordinate this.

The caller must also ensure that:

• offset_bytes plus size_bytes is less than the size of this region of memory.
• This memory region has been created with the MemoryPropertyFlags::HOST_VISIBLE flag.

pub fn unmap<'m, T>(&self, mapping: MemoryMapping<'m, T>)

Unmaps memory.

pub fn handle(&self) -> DeviceMemoryHandle

Returns this object’s handle.

pub fn device(&self) -> &Device

Returns a reference to the associated device.

Trait Implementations

impl Clone for DeviceMemory

fn clone(&self) -> DeviceMemory

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DeviceMemory

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'h> Handle for &'h DeviceMemory

type Target = DeviceMemoryHandle

fn handle(&self) -> Self::Target