From a40e0a9ffd47da0bbb3aaff74dced667e6dd5fe9 Mon Sep 17 00:00:00 2001
From: Courtney Goeltzenleuchter <courtneygo@google.com>
Date: Fri, 8 Jan 2016 11:52:37 -0700
Subject: layers: Add utility functions for new layer init

These utilities will find the appropriate CreateInfo
extension that defines the layer link information.
---
 layers/vk_layer_table.cpp | 20 ++++++++++++++++++++
 layers/vk_layer_table.h   |  4 ++++
 2 files changed, 24 insertions(+)

diff --git a/layers/vk_layer_table.cpp b/layers/vk_layer_table.cpp
index 1c4fa133..93d2fbf4 100644
--- a/layers/vk_layer_table.cpp
+++ b/layers/vk_layer_table.cpp
@@ -125,6 +125,26 @@ VkLayerInstanceDispatchTable *get_dispatch_table(instance_table_map &map, void*
     return it->second;
 }
 
+VkLayerInstanceCreateInfo *get_chain_info(const VkInstanceCreateInfo *pCreateInfo)
+{
+    VkLayerInstanceCreateInfo *chain_info = (VkLayerInstanceCreateInfo *) pCreateInfo->pNext;
+    while (chain_info && chain_info->sType != VK_STRUCTURE_TYPE_LOADER_INSTANCE_CREATE_INFO) {
+        chain_info = (VkLayerInstanceCreateInfo *) chain_info->pNext;
+    }
+    assert(chain_info != NULL);
+    return chain_info;
+}
+
+VkLayerDeviceCreateInfo *get_chain_info(const VkDeviceCreateInfo *pCreateInfo)
+{
+    VkLayerDeviceCreateInfo *chain_info = (VkLayerDeviceCreateInfo *) pCreateInfo->pNext;
+    while (chain_info && chain_info->sType != VK_STRUCTURE_TYPE_LOADER_DEVICE_CREATE_INFO) {
+        chain_info = (VkLayerDeviceCreateInfo *) chain_info->pNext;
+    }
+    assert(chain_info != NULL);
+    return chain_info;
+}
+
 /* Various dispatchable objects will use the same underlying dispatch table if they
  * are created from that "parent" object. Thus use pointer to dispatch table
  * as the key to these table maps.
diff --git a/layers/vk_layer_table.h b/layers/vk_layer_table.h
index bccd7364..816b6a69 100644
--- a/layers/vk_layer_table.h
+++ b/layers/vk_layer_table.h
@@ -24,6 +24,7 @@
  */
 #pragma once
 
+#include "vulkan/vulkan.h"
 #include <unordered_map>
 
 typedef std::unordered_map<void *, VkLayerDispatchTable *> device_table_map;
@@ -48,5 +49,8 @@ VkLayerDispatchTable *get_dispatch_table(device_table_map &map, void* object);
 
 VkLayerInstanceDispatchTable *get_dispatch_table(instance_table_map &map, void* object);
 
+VkLayerInstanceCreateInfo *get_chain_info(const VkInstanceCreateInfo *pCreateInfo);
+VkLayerDeviceCreateInfo *get_chain_info(const VkDeviceCreateInfo *pCreateInfo);
+
 void destroy_device_dispatch_table(dispatch_key key);
 void destroy_instance_dispatch_table(dispatch_key key);
-- 
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