zink: use portability EXT on Apple.

Vulkan behaviour has changed to require VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR
and VK_KHR_portability_enumeration to be used on layered Vulkan implementations.
These are enbaled on macOS/Apple as MoltenVK is the only implmentation (time of writing)
and newer version require this.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28259>

src/gallium/drivers/zink/zink_instance.py

@@ -28,6 +28,7 @@ from os import path
 from xml.etree import ElementTree
 from zink_extensions import Extension,Layer,ExtensionRegistry,Version
 import sys
+import platform
 
 # constructor: Extension(name, conditions=[], nonstandard=False)
 # The attributes:
@@ -50,6 +51,11 @@ EXTENSIONS = [
     Extension("VK_KHR_win32_surface"),
 ]
 
+if platform.system() == "Darwin":
+    EXTENSIONS += [
+        Extension("VK_KHR_portability_enumeration"),
+    ]
+
 # constructor: Layer(name, conditions=[])
 # - conditions: See documentation of EXTENSIONS.
 LAYERS = [
@@ -246,6 +252,9 @@ zink_create_instance(struct zink_screen *screen, bool display_dev)
 
    VkInstanceCreateInfo ici = {0};
    ici.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
+#ifdef __APPLE__
+   ici.flags = VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
+#endif
    ici.pApplicationInfo = &ai;
    ici.ppEnabledExtensionNames = extensions;
    ici.enabledExtensionCount = num_extensions;