C Specification
The VkImportFenceFdInfoKHR
structure is defined as:
// Provided by VK_KHR_external_fence_fd
typedef struct VkImportFenceFdInfoKHR {
VkStructureType sType;
const void* pNext;
VkFence fence;
VkFenceImportFlags flags;
VkExternalFenceHandleTypeFlagBits handleType;
int fd;
} VkImportFenceFdInfoKHR;
Members
-
sType
is a VkStructureType value identifying this structure. -
pNext
isNULL
or a pointer to a structure extending this structure. -
fence
is the fence into which the payload will be imported. -
flags
is a bitmask of VkFenceImportFlagBits specifying additional parameters for the fence payload import operation. -
handleType
is a VkExternalFenceHandleTypeFlagBits value specifying the type offd
. -
fd
is the external handle to import.
Description
The handle types supported by handleType
are:
Handle Type | Transference | Permanence Supported |
---|---|---|
|
Reference |
Temporary,Permanent |
|
Copy |
Temporary |
If handleType
is VK_EXTERNAL_FENCE_HANDLE_TYPE_SYNC_FD_BIT
, the
special value -1
for fd
is treated like a valid sync file descriptor
referring to an object that has already signaled.
The import operation will succeed and the VkFence
will have a
temporarily imported payload as if a valid file descriptor had been
provided.
Note
This special behavior for importing an invalid sync file descriptor allows
easier interoperability with other system APIs which use the convention that
an invalid sync file descriptor represents work that has already completed
and does not need to be waited for.
It is consistent with the option for implementations to return a |
Document Notes
For more information, see the Vulkan Specification
This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.