Conditionally enable the XCB WSI extension

src/Vulkan/libVulkan.cpp

@@ -320,7 +320,7 @@ static const ExtensionProperties instanceExtensionProperties[] = {
 	{ { VK_KHR_SURFACE_EXTENSION_NAME, VK_KHR_SURFACE_SPEC_VERSION } },
 #endif
 #ifdef VK_USE_PLATFORM_XCB_KHR
-	{ { VK_KHR_XCB_SURFACE_EXTENSION_NAME, VK_KHR_XCB_SURFACE_SPEC_VERSION } },
+	{ { VK_KHR_XCB_SURFACE_EXTENSION_NAME, VK_KHR_XCB_SURFACE_SPEC_VERSION }, vk::XcbSurfaceKHR::hasLibXCB() },
 #endif
 #ifdef VK_USE_PLATFORM_XLIB_KHR
 	{ { VK_KHR_XLIB_SURFACE_EXTENSION_NAME, VK_KHR_XLIB_SURFACE_SPEC_VERSION }, static_cast<bool>(libX11) },
@@ -3657,6 +3657,9 @@ VKAPI_ATTR VkResult VKAPI_CALL vkCreateXcbSurfaceKHR(VkInstance instance, const
 	TRACE("(VkInstance instance = %p, VkXcbSurfaceCreateInfoKHR* pCreateInfo = %p, VkAllocationCallbacks* pAllocator = %p, VkSurface* pSurface = %p)",
 	      instance, pCreateInfo, pAllocator, pSurface);
 
+	// VUID-VkXcbSurfaceCreateInfoKHR-connection-01310 : connection must point to a valid X11 xcb_connection_t
+	ASSERT(pCreateInfo->connection);
+
 	return vk::XcbSurfaceKHR::Create(pAllocator, pCreateInfo, pSurface);
 }
 

src/WSI/XcbSurfaceKHR.cpp

@@ -109,6 +109,11 @@ VkExtent2D getWindowSize(xcb_connection_t *connection, xcb_window_t window)
 
 namespace vk {
 
+bool XcbSurfaceKHR::hasLibXCB()
+{
+	return libXcb;
+}
+
 XcbSurfaceKHR::XcbSurfaceKHR(const VkXcbSurfaceCreateInfoKHR *pCreateInfo, void *mem)
     : connection(pCreateInfo->connection)
     , window(pCreateInfo->window)

src/WSI/XcbSurfaceKHR.hpp

@@ -40,6 +40,8 @@ public:
 	virtual void detachImage(PresentImage *image) override;
 	VkResult present(PresentImage *image) override;
 
+	static bool hasLibXCB();
+
 private:
 	xcb_connection_t *connection;
 	xcb_window_t window;