Struct BufferUsage

pub struct BufferUsage {
    pub none: Option<u32>,
    pub cpu: Option<u32>,
    pub vulkan: Option<u32>,
    pub display: Option<u32>,
    pub video: Option<u32>,
    /* private fields */
}

Describes how a client will access the contents of a buffer.

Fields

none: Option<u32>

If the client sets this field, the client should not set any other fields in the same table instance. The only valid bit in this field is NONE_USAGE which must be set if this field is set. The point of this field and the one bit set in this field is to essentially prove that the client really means they aren’t going to use the buffers, so don’t need any VMOs (didn’t just fail to fill out the table).

cpu: Option<u32>

If set, holds CPU usage bits. See CPU_USAGE_* flags in usages.fidl.

vulkan: Option<u32>

If set, holds vulkan usage bits. See VULKAN_IMAGE_* and VULKAN_BUFFER_* bits in usages.fidl. The VULKAN_USAGE_* bit definitions/names are deprecated.

display: Option<u32>

If set, holds display usage bits. See DISPLAY_USAGE_* bits in usages.fidl.

video: Option<u32>

If set, holds video usage bits. See VIDEO_USAGE_* bits in usages.fidl.

Trait Implementations

impl Clone for BufferUsage

fn clone(&self) -> BufferUsage

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BufferUsage

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

Formats the value using the given formatter.

impl<D: ResourceDialect> Decode<BufferUsage, D> for BufferUsage

fn new_empty() -> Self

Creates a valid instance of Self. The specific value does not matter, since it will be overwritten by decode.

unsafe fn decode( &mut self, decoder: &mut Decoder<'_, D>, offset: usize, depth: Depth, ) -> Result<()>

Decodes an object of type T from the decoder’s buffers into self.

impl Default for BufferUsage

fn default() -> BufferUsage

Returns the “default value” for a type.

impl<D: ResourceDialect> Encode<BufferUsage, D> for &BufferUsage

unsafe fn encode( self, encoder: &mut Encoder<'_, D>, offset: usize, depth: Depth, ) -> Result<()>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID.

impl PartialEq for BufferUsage

fn eq(&self, other: &BufferUsage) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TypeMarker for BufferUsage

type Owned = BufferUsage

The owned Rust type which this FIDL type decodes into.

fn inline_align(_context: Context) -> usize

Returns the minimum required alignment of the inline portion of the encoded object. It must be a (nonzero) power of two.

fn inline_size(_context: Context) -> usize

Returns the size of the inline portion of the encoded object, including padding for alignment. Must be a multiple of inline_align.

fn encode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and encoding requires no validation. When true, we can optimize encoding arrays and vectors of Self::Owned to a single memcpy.

fn decode_is_copy() -> bool

Returns true if the memory layout of Self::Owned matches the FIDL wire format and decoding requires no validation. When true, we can optimize decoding arrays and vectors of Self::Owned to a single memcpy.

impl ValueTypeMarker for BufferUsage

type Borrowed<'a> = &'a BufferUsage

The Rust type to use for encoding. This is a particular Encode<Self> type cheaply obtainable from &Self::Owned. There are three cases:

fn borrow(value: &<Self as TypeMarker>::Owned) -> Self::Borrowed<'_>

Cheaply converts from &Self::Owned to Self::Borrowed.

impl Persistable for BufferUsage

impl StructuralPartialEq for BufferUsage