1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

use crate::access::AccessFlags;

bitflags::bitflags! {
    /// Memory usage type.
    /// Bits set define intended usage for requested memory.
    #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
    pub struct MemoryUsage: u8 {
        /// Hints allocator that memory will be used for data downloading.
        /// Allocator will strongly prefer host-cached memory.
        /// Implies `HOST_ACCESS` flag.
        const DOWNLOAD = 0x04;

        /// Hints allocator that memory will be used for data uploading.
        /// If `DOWNLOAD` flag is not set then allocator will assume that
        /// host will access memory in write-only manner and may
        /// pick not host-cached.
        /// Implies `HOST_ACCESS` flag.
        const UPLOAD = 0x08;

        /// Hints for device to find memory with fast device access.
        const FAST_DEVICE_ACCESS = 0x10;
    }
}

#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub struct MemoryBarrier {
    pub src: AccessFlags,
    pub dst: AccessFlags,
}