+#include "vulkan.h"
+#include <stdbool.h>
+
+// Loader-ICD version negotiation API. Versions add the following features:
+// Version 0 - Initial. Doesn't support vk_icdGetInstanceProcAddr
+// or vk_icdNegotiateLoaderICDInterfaceVersion.
+// Version 1 - Add support for vk_icdGetInstanceProcAddr.
+// Version 2 - Add Loader/ICD Interface version negotiation
+// via vk_icdNegotiateLoaderICDInterfaceVersion.
+// Version 3 - Add ICD creation/destruction of KHR_surface objects.
+// Version 4 - Add unknown physical device extension qyering via
+// vk_icdGetPhysicalDeviceProcAddr.
+// Version 5 - Tells ICDs that the loader is now paying attention to the
+// application version of Vulkan passed into the ApplicationInfo
+// structure during vkCreateInstance. This will tell the ICD
+// that if the loader is older, it should automatically fail a
+// call for any API version > 1.0. Otherwise, the loader will
+// manually determine if it can support the expected version.
+#define CURRENT_LOADER_ICD_INTERFACE_VERSION 5
+#define MIN_SUPPORTED_LOADER_ICD_INTERFACE_VERSION 0
+#define MIN_PHYS_DEV_EXTENSION_ICD_INTERFACE_VERSION 4
+typedef VkResult(VKAPI_PTR *PFN_vkNegotiateLoaderICDInterfaceVersion)(uint32_t *pVersion);
+
+// This is defined in vk_layer.h which will be found by the loader, but if an ICD is building against this
+// file directly, it won't be found.
+#ifndef PFN_GetPhysicalDeviceProcAddr
+typedef PFN_vkVoidFunction(VKAPI_PTR *PFN_GetPhysicalDeviceProcAddr)(VkInstance instance, const char *pName);
+#endif