[PATCH v2 1/5] win32u: Introduce new win32u vulkan function table.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/win32u/vulkan.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/vulkan.c b/dlls/win32u/vulkan.c
index c66be5bc7ed..bd989a4979f 100644
--- a/dlls/win32u/vulkan.c
+++ b/dlls/win32u/vulkan.c
@@ -22,14 +22,38 @@
 #pragma makedep unix
 #endif

+#include "config.h"
+
+#include <pthread.h>
+
 #include "win32u_private.h"
 #include "wine/vulkan.h"
 #include "wine/vulkan_driver.h"

+WINE_DEFAULT_DEBUG_CHANNEL(vulkan);
+
+static const struct vulkan_funcs *driver_funcs;
+static struct vulkan_funcs vulkan_funcs;
+
+static void load_vulkan(void)
+{
+    if ((driver_funcs = user_driver->pwine_get_vulkan_driver( WINE_VULKAN_DRIVER_VERSION )))
+        vulkan_funcs = *driver_funcs;
+}
+
 /***********************************************************************
  *      __wine_get_vulkan_driver  (win32u.so)
  */
 const struct vulkan_funcs *__wine_get_vulkan_driver( UINT version )
 {
-    return user_driver->pwine_get_vulkan_driver( version );
+    static pthread_once_t init_once = PTHREAD_ONCE_INIT;
+
+    if (version != WINE_VULKAN_DRIVER_VERSION)
+    {
+        ERR( "version mismatch, vulkan wants %u but driver has %u\n", version, WINE_VULKAN_DRIVER_VERSION );
+        return NULL;
+    }
+
+    pthread_once( &init_once, load_vulkan );
+    return driver_funcs ? &vulkan_funcs : NULL;
 }