Add a loader features interface

This is needed to tell a layer if the loader is sorting physical
devices, but it should be generalized so that other loader features
could be marked in the future.

diff --git a/include/vulkan/vk_layer.h b/include/vulkan/vk_layer.h
index fa76520..0651870 100644 (file)
--- a/include/vulkan/vk_layer.h
+++ b/include/vulkan/vk_layer.h
@@ -83,7 +83,8 @@ typedef VkResult(VKAPI_PTR *PFN_PhysDevExt)(VkPhysicalDevice phys_device);
 typedef enum VkLayerFunction_ {
     VK_LAYER_LINK_INFO = 0,
     VK_LOADER_DATA_CALLBACK = 1,
-    VK_LOADER_LAYER_CREATE_DEVICE_CALLBACK = 2
+    VK_LOADER_LAYER_CREATE_DEVICE_CALLBACK = 2,
+    VK_LOADER_FEATURES = 3,
 } VkLayerFunction;
 
 typedef struct VkLayerInstanceLink_ {
@@ -111,6 +112,12 @@ typedef VkResult (VKAPI_PTR *PFN_vkSetDeviceLoaderData)(VkDevice device,
 typedef VkResult (VKAPI_PTR *PFN_vkLayerCreateDevice)(VkInstance instance, VkPhysicalDevice physicalDevice, const VkDeviceCreateInfo *pCreateInfo,
                                                      const VkAllocationCallbacks *pAllocator, VkDevice *pDevice, PFN_vkGetInstanceProcAddr layerGIPA, PFN_vkGetDeviceProcAddr *nextGDPA);
 typedef void (VKAPI_PTR *PFN_vkLayerDestroyDevice)(VkDevice physicalDevice, const VkAllocationCallbacks *pAllocator, PFN_vkDestroyDevice destroyFunction);
+
+typedef enum VkLoaderFeastureFlagBits {
+    VK_LOADER_FEATURE_PHYSICAL_DEVICE_SORTING = 0x00000001,
+} VkLoaderFlagBits;
+typedef VkFlags VkLoaderFeatureFlags;
+
 typedef struct {
     VkStructureType sType; // VK_STRUCTURE_TYPE_LOADER_INSTANCE_CREATE_INFO
     const void *pNext;
@@ -119,9 +126,10 @@ typedef struct {
         VkLayerInstanceLink *pLayerInfo;
         PFN_vkSetInstanceLoaderData pfnSetInstanceLoaderData;
         struct {
-         PFN_vkLayerCreateDevice pfnLayerCreateDevice;
-         PFN_vkLayerDestroyDevice pfnLayerDestroyDevice;
-       } layerDevice;
+               PFN_vkLayerCreateDevice pfnLayerCreateDevice;
+               PFN_vkLayerDestroyDevice pfnLayerDestroyDevice;
+           } layerDevice;
+        VkLoaderFeatureFlags loaderFeatures;
     } u;
 } VkLayerInstanceCreateInfo;