EBufferUsageFlags

Resource usage flags - for vertex and index buffers.

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Windows

macOS

Linux

References

Module	RHI
Header	/Engine/Source/Runtime/RHI/Public/RHIDefinitions.h
Include	#include "RHIDefinitions.h"

Syntax

enum EBufferUsageFlags
{
    None                     = 0,
    Static                   = 1 << 0,
    Dynamic                  = 1 << 1,
    Volatile                 = 1 << 2,
    UnorderedAccess          = 1 << 3,
    ByteAddressBuffer        = 1 << 4,
    SourceCopy               = 1 << 5,
    StreamOutput             = 1 << 6,
    DrawIndirect             = 1 << 7,
    ShaderResource           = 1 << 8,
    KeepCPUAccessible        = 1 << 9,
    FastVRAM                 = 1 << 10,
    Shared                   = 1 << 12,
    AccelerationStructure    = 1 << 13,
    VertexBuffer             = 1 << 14,
    IndexBuffer              = 1 << 15,
    StructuredBuffer         = 1 << 16,
    MultiGPUAllocate         = 1 << 17,
    MultiGPUGraphIgnore      = 1 << 18,
    AnyDynamic               = (Dynamic | Volatile),
}

Values

Name	Description
None
Static	The buffer will be written to once.
Dynamic	The buffer will be written to occasionally, GPU read only, CPU write only.
Volatile	The buffer's data will have a lifetime of one frame.
UnorderedAccess	Allows an unordered access view to be created for the buffer.
ByteAddressBuffer	Create a byte address buffer, which is basically a structured buffer with a uint32 type.
SourceCopy	Buffer that the GPU will use as a source for a copy.
StreamOutput	Create a buffer that can be bound as a stream output target.
DrawIndirect	Create a buffer which contains the arguments used by DispatchIndirect or DrawIndirect.
ShaderResource	Create a buffer that can be bound as a shader resource.
KeepCPUAccessible	Request that this buffer is directly CPU accessible.
FastVRAM	Buffer should go in fast vram (hint only). Requires BUF_Transient
Shared	Buffer should be allocated from transient memory.
AccelerationStructure	Buffer contains opaque ray tracing acceleration structure data.
VertexBuffer
IndexBuffer
StructuredBuffer
MultiGPUAllocate	Buffer memory is allocated independently for multiple GPUs, rather than shared via driver aliasing
MultiGPUGraphIgnore	Tells the render graph to not bother transferring across GPUs in multi-GPU scenarios.
AnyDynamic	Helper bit-masks.

Remarks

Resource usage flags - for vertex and index buffers.