C Specification
In order to support systems with multiple Vulkan implementations, the
function pointers returned by vkGetInstanceProcAddr may point to
dispatch code that calls a different real implementation for different
VkDevice objects or their child objects.
The overhead of the internal dispatch for VkDevice objects can be
avoided by obtaining device-specific function pointers for any commands that
use a device or device-child object as their dispatchable object.
Such function pointers can be obtained with the command:
// Provided by VK_VERSION_1_0
PFN_vkVoidFunction vkGetDeviceProcAddr(
VkDevice device,
const char* pName);Parameters
The table below defines the various use cases for vkGetDeviceProcAddr
and expected return value for each case.
Description
The returned function pointer is of type PFN_vkVoidFunction, and must
be cast to the type of the command being queried before use.
The function pointer must only be called with a dispatchable object (the
first parameter) that is device or a child of device.
device |
pName |
return value |
|---|---|---|
|
*1 |
undefined |
invalid device |
*1 |
undefined |
device |
|
undefined |
device |
core device-level Vulkan command |
fp2 |
device |
enabled extension device-level commands |
fp2 |
any other case, not covered above |
|
|
- 1
-
"*" means any representable value for the parameter (including valid values, invalid values, and
NULL). - 2
-
The returned function pointer must only be called with a dispatchable object (the first parameter) that is
deviceor a child ofdevicee.g. VkDevice, VkQueue, or VkCommandBuffer.
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.