vkEnumerateInstanceVersion is not available.

[sunbearc22]

Hi realitix. I think we need the vkEnumerateInstanceVersion function in _vulkan.py for Vulkan versions 1.1.70.0 and upwards.

According to Spec, this function is obtained using

vkGetInstanceProcAddr( instance=Null, pName=vkEnumerateInstanceVersion )

After reading _vulkan.py, I noticed that vkEnumerateInstanceExtensionProperties, vkEnumerateInstanceLayerProperties and vkCreateInstance were explicitly declared python functions. Meaning functions provided by vkGetInstanceProcAddr when instance=Null are to be explicitly declared python functions. Thus _vulkan.py should have vkEnumerateInstanceVersion as an explicitly declared python function.

I did try something like:

vkEnumerateInstanceVersion = vkGetInstanceProcAddr(None, vkEnumerateInstanceVersion)

but got

UnboundLocalError: local variable 'vkEnumerateInstanceVersion' referenced before assignment

Suggestion. Will the following function be appropriate for _vulkan.py?

def vkEnumerateInstanceVersion(pApiVersion):
   ''Supply pApiVersion in str format, e.g. `1.1.77.0` '''

    pApiVersion = pApiVersion.split('.')
    major = int(pApiVersion[0])
    minor = int(pApiVersion[1])
    patch = int(pApiVersion[2])
    pApiVersion = VK_MAKE_VERSION(major, minor, patch)

    result = _callApi(lib.vkEnumerateInstanceVersion, pApiVersion)
    if result != VK_SUCCESS:
        raise exception_codes[result]

    return result

[sunbearc22]

Hi realitix, I have adapted the example by LunarG and applied it on vulkan 1.1.71.2 app. Below is the function to test for vkEnumerateInstanceVersion.

    def checkApiVersion(self):
        try:
            vkEnumerateInstanceVersion = vkGetInstanceProcAddr(
                VK_NULL_HANDLE, "vkEnumerateInstanceVersion")
            logging.info('"vkEnumerateInstanceVersion" exist.')
        except ExtensionNotSupportedError:
            logging.info('No "vkEnumerateInstanceVersion": treat as Vulkan 1.0 only.')

Presently, vulkan 1.1.71.2 is returning ExtensionNotSupportedError when this function is executed.

vulkan.cdef.h lines 3874 & 3903 do define vkEnumerateInstanceVersion.

[sunbearc22]

I tried appending the following vkEnumerateInstanceVersion function at line 3728 of _vulkan.py to fake its presence but my above function still met the exception ExtensionNotSupportedError.

def vkEnumerateInstanceVersion():

    pApiVersion = ffi.NULL

    result = _callApi(lib.vkEnumerateInstanceVersion, pApiVersion)
    if result != VK_SUCCESS:
        raise exception_codes[result]

    return result

[realitix]

Hello @sunbearc22,
Thanks for the report, I will look at it.

[sunbearc22]

@realitix. Thanks. I have corrected the above function to use pApiVersion = ffi.new('uint32_t*') but still did not work.

BTW, is macro VK_DEFINE_HANDLE missing also? I could not find it in _vulkan.py or vulkan.cdef.h.

I have also reviewed the definition of lib. in _vulkan.py. According to line 97 & 100, for Linux users lib refers to $VULKAN_SDK/lib/libvulkan.so.1 which is a link to $VULKAN_SDK/lib/libvulkan.so.1.1.77 in my case. So I have checked that lib. is accessing the correct version of the Vulkan library I want to test.

[sunbearc22]

@realitix. According to definition of vkGetInstanceProcAddr line 6857, the object in _instance_ext_funcs needs vkEnumerateInstanceVersion but is missing. After adding the definition, the ExtensionNotSupportedError was avoided. Question: Is vkEnumerateInstanceVersion an instance extension function given that its parameter instance = VK_NULL_HANDLE ?

def vkGetInstanceProcAddr(instance, pName):
    fn = _callApi(lib.vkGetInstanceProcAddr, instance, pName)
    if fn == ffi.NULL:
        raise ProcedureNotFoundError()
    if not pName in _instance_ext_funcs:
        raise ExtensionNotSupportedError()
    fn = ffi.cast('PFN_' + pName, fn)
    return _instance_ext_funcs[pName](fn)

[realitix]

Hello @sunbearc22,
It should be fixed when the new_version will be ready

[realitix]

Hello @sunbearc22,
Can you try again, I just updated to the 1.1.99 SDK

[sunbearc22]

Hi realitx, apologies for my late reply. May I know which LunarG Vulkan SDK does vulkan 1.1.99.0 uses? I could find these closes SDKs (1.1.97.0, 1.1.101.0, and 1.1.106.0).

[realitix]

Hello @sunbearc22.
It should work now.
I will push a new version soon on pypi.