zink: Learn about VK_KHR_swapchain

We're gonna want it eventually.

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10382>

src/gallium/drivers/zink/zink_device_info.py

@@ -137,6 +137,7 @@ EXTENSIONS = [
         alias="scalar_block_layout",
         features=True,
         conditions=["$feats.scalarBlockLayout"]),
+    Extension("VK_KHR_swapchain"),
 ]
 
 # constructor: Versions(device_version(major, minor, patch), struct_version(major, minor))

src/gallium/drivers/zink/zink_screen.c

@@ -1203,6 +1203,11 @@ load_device_extensions(struct zink_screen *screen)
    }
 #endif // VK_EXTX_PORTABILITY_SUBSET_EXTENSION_NAME
 
+   if (screen->info.have_KHR_swapchain) {
+      GET_PROC_ADDR(CreateSwapchainKHR);
+      GET_PROC_ADDR(DestroySwapchainKHR);
+   }
+
    return true;
 }
 

src/gallium/drivers/zink/zink_screen.h

@@ -146,6 +146,9 @@ struct zink_screen {
    PFN_vkGetIOSurfaceMVK vk_GetIOSurfaceMVK;
 #endif
 
+   PFN_vkCreateSwapchainKHR vk_CreateSwapchainKHR;
+   PFN_vkDestroySwapchainKHR vk_DestroySwapchainKHR;
+
    struct {
       bool dual_color_blend_by_location;
       bool inline_uniforms;