loader: Add pre-instance functions for layers

Allow implicit layers (not explicit) to intercept calls before an
instance has been created.

Change-Id: I41f5bb0f5a6314fbab8003ebe71059dd04afc860

1 files changed, 39 insertions, 0 deletions

diff --git a/include/vulkan/vk_layer.h b/include/vulkan/vk_layer.h
index a7ac2915..147dcd43 100644
--- a/include/vulkan/vk_layer.h
+++ b/include/vulkan/vk_layer.h
@@ -48,6 +48,8 @@
 #define CURRENT_LOADER_LAYER_INTERFACE_VERSION 2
 #define MIN_SUPPORTED_LOADER_LAYER_INTERFACE_VERSION 1
 
+#define VK_CURRENT_CHAIN_VERSION 1
+
 // Version negotiation values
 typedef enum VkNegotiateLayerStructType {
     LAYER_NEGOTIATE_UNINTIALIZED = 0,
@@ -138,6 +140,43 @@ extern "C" {
 
 VKAPI_ATTR VkResult VKAPI_CALL vkNegotiateLoaderLayerInterfaceVersion(VkNegotiateLayerInterface *pVersionStruct);
 
+typedef enum VkChainType {
+    VK_CHAIN_TYPE_UNKNOWN = 0,
+    VK_CHAIN_TYPE_ENUMERATE_INSTANCE_EXTENSION_PROPERTIES = 1,
+    VK_CHAIN_TYPE_ENUMERATE_INSTANCE_LAYER_PROPERTIES = 2,
+} VkChainType;
+
+typedef struct VkChainHeader {
+    VkChainType type;
+    uint32_t version;
+    uint32_t size;
+} VkChainHeader;
+
+typedef struct VkEnumerateInstanceExtensionPropertiesChain {
+    VkChainHeader header;
+    VkResult(VKAPI_PTR *pfnNextLayer)(const struct VkEnumerateInstanceExtensionPropertiesChain *, const char *, uint32_t *,
+                                      VkExtensionProperties *);
+    const struct VkEnumerateInstanceExtensionPropertiesChain *pNextLink;
+
+#if defined(__cplusplus)
+    inline VkResult CallDown(const char *pLayerName, uint32_t *pPropertyCount, VkExtensionProperties *pProperties) const {
+        return pfnNextLayer(pNextLink, pLayerName, pPropertyCount, pProperties);
+    }
+#endif
+} VkEnumerateInstanceExtensionPropertiesChain;
+
+typedef struct VkEnumerateInstanceLayerPropertiesChain {
+    VkChainHeader header;
+    VkResult(VKAPI_PTR *pfnNextLayer)(const struct VkEnumerateInstanceLayerPropertiesChain *, uint32_t *, VkLayerProperties *);
+    const struct VkEnumerateInstanceLayerPropertiesChain *pNextLink;
+
+#if defined(__cplusplus)
+    inline VkResult CallDown(uint32_t *pPropertyCount, VkLayerProperties *pProperties) const {
+        return pfnNextLayer(pNextLink, pPropertyCount, pProperties);
+    }
+#endif
+} VkEnumerateInstanceLayerPropertiesChain;
+
 #ifdef __cplusplus
 }
 #endif