Struct vulkano::memory::MappedDeviceMemory
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pub struct MappedDeviceMemory { /* fields omitted */ }
Represents memory that has been allocated and mapped in CPU accessible space.
Can be obtained with DeviceMemory::alloc_and_map
. The function will panic if the memory type
is not host-accessible.
In order to access the content of the allocated memory, you can use the read_write
method.
This method returns a guard object that derefs to the content.
Example
use vulkano::memory::DeviceMemory; // The memory type must be mappable. let mem_ty = device.physical_device().memory_types() .filter(|t| t.is_host_visible()) .next().unwrap(); // Vk specs guarantee that this can't fail // Allocates 1kB of memory. let memory = DeviceMemory::alloc_and_map(device.clone(), mem_ty, 1024).unwrap(); // Get access to the content. Note that this is very unsafe for two reasons: 1) the content is // uninitialized, and 2) the access is unsynchronized. unsafe { let mut content = memory.read_write::<[u8]>(0 .. 1024); content[12] = 54; // `content` derefs to a `&[u8]` or a `&mut [u8]` }
Methods
impl MappedDeviceMemory
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fn unmap(self) -> DeviceMemory
Unmaps the memory. It will no longer be accessible from the CPU.
unsafe fn read_write<T: ?Sized>(&self, range: Range<usize>) -> CpuAccess<T> where
T: Content,
T: Content,
Gives access to the content of the memory.
This function takes care of calling vkInvalidateMappedMemoryRanges
and
vkFlushMappedMemoryRanges
on the given range. You are therefore encouraged to use the
smallest range as possible, and to not call this function multiple times in a row for
several small changes.
Safety
- Type safety is not checked. You must ensure that
T
corresponds to the content of the buffer. - Accesses are not synchronized. Synchronization must be handled outside of
the
MappedDeviceMemory
.
Trait Implementations
impl AsRef<DeviceMemory> for MappedDeviceMemory
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fn as_ref(&self) -> &DeviceMemory
Performs the conversion.
impl AsMut<DeviceMemory> for MappedDeviceMemory
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fn as_mut(&mut self) -> &mut DeviceMemory
Performs the conversion.