libvulkan: support vkGIPA self-query
vkGetInstanceProcAddr(nullptr, ...) is valid and is effectively a
globally dispatched function, so it's consistent to support querying
vkGetInstanceProcAddr from itself without an instance.
This is required in Vulkan 1.2 and is supported for all Vulkan versions
by the loader on other platforms. To maximize app compatibility and
minimize surprises, this makes it work on Android also, even for pre-1.2
versions where the result is undefined by the spec.
Bug: 157173922
Test: dEQP-VK.api.version_check.entry_points with
https://gerrit.khronos.org/#/c/5490/ applied and modified to
check even on pre-1.2 implementations.
Change-Id: I820dd1239df54a415b7ff5db47cf2c2b349f6155
diff --git a/vulkan/scripts/api_generator.py b/vulkan/scripts/api_generator.py
index 7c39075..be24172 100644
--- a/vulkan/scripts/api_generator.py
+++ b/vulkan/scripts/api_generator.py
@@ -152,7 +152,9 @@
if (instance == VK_NULL_HANDLE) {\n""")
for cmd in gencom.command_list:
- if gencom.is_globally_dispatched(cmd):
+ # vkGetInstanceProcAddr(nullptr, "vkGetInstanceProcAddr") is effectively
+ # globally dispatched
+ if gencom.is_globally_dispatched(cmd) or cmd == 'vkGetInstanceProcAddr':
f.write(gencom.indent(2) +
'if (strcmp(pName, \"' + cmd +
'\") == 0) return reinterpret_cast<PFN_vkVoidFunction>(' +