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D3D12_CROSS_NODE_SHARING_TIER enumeration (d3d12.h)

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Specifies the level of sharing across nodes of an adapter, such as Tier 1 Emulated, Tier 1, or Tier 2.

Syntax

typedef enum D3D12_CROSS_NODE_SHARING_TIER {
  D3D12_CROSS_NODE_SHARING_TIER_NOT_SUPPORTED = 0,
  D3D12_CROSS_NODE_SHARING_TIER_1_EMULATED = 1,
  D3D12_CROSS_NODE_SHARING_TIER_1 = 2,
  D3D12_CROSS_NODE_SHARING_TIER_2 = 3,
  D3D12_CROSS_NODE_SHARING_TIER_3 = 4
} ;

Constants

 
D3D12_CROSS_NODE_SHARING_TIER_NOT_SUPPORTED
Value: 0
If an adapter has only 1 node, then cross-node sharing doesn't apply, so the CrossNodeSharingTier member of the D3D12_FEATURE_DATA_D3D12_OPTIONS structure is set to D3D12_CROSS_NODE_SHARING_NOT_SUPPORTED.
D3D12_CROSS_NODE_SHARING_TIER_1_EMULATED
Value: 1
Tier 1 Emulated. Devices that set the CrossNodeSharingTier member of the D3D12_FEATURE_DATA_D3D12_OPTIONS structure to D3D12_CROSS_NODE_SHARING_TIER_1_EMULATED have Tier 1 support.
However, drivers stage these copy operations through a driver-internal system memory allocation. This will cause these copy operations to consume time on the destination GPU as well as the source.
D3D12_CROSS_NODE_SHARING_TIER_1
Value: 2
Tier 1. Devices that set the CrossNodeSharingTier member of the D3D12_FEATURE_DATA_D3D12_OPTIONS structure to D3D12_CROSS_NODE_SHARING_TIER_1 only support the following cross-node copy operations:



Additionally, the cross-node resource must be the destination of the copy operation.
D3D12_CROSS_NODE_SHARING_TIER_2
Value: 3
Tier 2. Devices that set the CrossNodeSharingTier member of the D3D12_FEATURE_DATA_D3D12_OPTIONS structure to D3D12_CROSS_NODE_SHARING_TIER_2 support all operations across nodes, except for the following:


  • Render target views.

  • Depth stencil views.

  • UAV atomic operations. Similar to CPU/GPU interop, shaders may perform UAV atomic operations; however, no atomicity across adapters is guaranteed.


Applications can retrieve the node where a resource/heap exists from the D3D12_HEAP_DESC structure. These values are retrievable for opened resources. The runtime performs the appropriate re-mapping in case the 2 devices are using different UMD-specified node re-mappings.
D3D12_CROSS_NODE_SHARING_TIER_3
Value: 4
Indicates support for D3D12_HEAP_FLAG_ALLOW_SHADER_ATOMICS on heaps that are visible to multiple nodes.

Remarks

This enum is used by the CrossNodeSharingTier member of the D3D12_FEATURE_DATA_D3D12_OPTIONS structure.

Requirements

Requirement Value
Header d3d12.h

See also

Core Enumerations