ID3D12Device::CreateReservedResource method (d3d12.h)
Creates a resource that is reserved, and not yet mapped to any pages in a heap.
HRESULT CreateReservedResource( [in] const D3D12_RESOURCE_DESC *pDesc, [in] D3D12_RESOURCE_STATES InitialState, [in, optional] const D3D12_CLEAR_VALUE *pOptimizedClearValue, [in] REFIID riid, [out, optional] void **ppvResource );
Type: const D3D12_RESOURCE_DESC*
A pointer to a D3D12_RESOURCE_DESC structure that describes the resource.
The initial state of the resource, as a bitwise-OR'd combination of D3D12_RESOURCE_STATES enumeration constants.
[in, optional] pOptimizedClearValue
Type: const D3D12_CLEAR_VALUE*
Specifies a D3D12_CLEAR_VALUE structure that describes the default value for a clear color.
pOptimizedClearValue specifies a value for which clear operations are most optimal. When the created resource is a texture with either the D3D12_RESOURCE_FLAG_ALLOW_RENDER_TARGET or D3D12_RESOURCE_FLAG_ALLOW_DEPTH_STENCIL flags, you should choose the value with which the clear operation will most commonly be called. You can call the clear operation with other values, but those operations won't be as efficient as when the value matches the one passed in to resource creation.
When you use D3D12_RESOURCE_DIMENSION_BUFFER, you must set pOptimizedClearValue to
A reference to the globally unique identifier (GUID) of the resource interface to return in ppvResource. See Remarks.
While riidResource is most commonly the GUID of ID3D12Resource, it may be the GUID of any interface. If the resource object doesn't support the interface for this GUID, then creation fails with E_NOINTERFACE.
[out, optional] ppvResource
An optional pointer to a memory block that receives the requested interface pointer to the created resource object.
ppvResource can be
nullptr, to enable capability testing. When ppvResource is
nullptr, no object is created, and S_FALSE is returned when pDesc is valid.
|E_OUTOFMEMORY||There is insufficient memory to create the resource.|
See Direct3D 12 return codes for other possible return values.
CreateReservedResource is equivalent to D3D11_RESOURCE_MISC_TILED in Direct3D 11. It creates a resource with virtual memory only, no backing store.
These resource types can only be created when the adapter supports tiled resource tier 1 or greater. The tiled resource tier defines the behavior of accessing a resource that is not mapped to a heap.