commit 8fd0825b4161fa32f187d10cff2162c0334d2b4f
author Jon Ashburn <jon@lunarg.com> Thu May 28 16:25:02 2015 -0600
committer Courtney Goeltzenleuchter <courtney@LunarG.com> Wed Jun 17 20:56:36 2015 -0600
tree ce1c3861accccf9deda662208eb8ee939e2006cb
parent 4f67d74c40a9c1864d4e07fedcd5ac3ca975670f

loader: Support layers that don't have an extension entrypoint

Change all layers and loader interface to init dispatch tables on
GPA("GetXXXProcAddr").  After that initialization rest of dispatch
tables are inited via unwrapped object using the GPA in the dispatch
table.  This also allows App generated GPA calls that the loader can't resolve
to function correctly.

layers/mem_tracker.cpp

diff --git a/layers/mem_tracker.cpp b/layers/mem_tracker.cpp
index b77b742..3898a54 100644
--- a/layers/mem_tracker.cpp
+++ b/layers/mem_tracker.cpp
@@ -796,7 +796,7 @@
         return it->second;
     }
 
-    layer_initialize_dispatch_table(pTable, (PFN_vkGetDeviceProcAddr) devw->pGPA, (VkDevice) devw->nextObject);
+    layer_initialize_dispatch_table(pTable, devw);
 
     return pTable;
 }
@@ -818,7 +818,7 @@
         return it->second;
     }
 
-    layer_init_instance_dispatch_table(pTable, (PFN_vkGetInstanceProcAddr) instw->pGPA, (VkInstance) instw->nextObject);
+    layer_init_instance_dispatch_table(pTable, instw);
 
     return pTable;
 }
@@ -2151,17 +2151,17 @@
     VkDevice         dev,
     const char       *funcName)
 {
-    VkBaseLayerObject* devw = (VkBaseLayerObject *) dev;
-
     if (dev == NULL) {
         return NULL;
     }
 
     loader_platform_thread_once(&g_initOnce, initMemTracker);
-    initDeviceTable((const VkBaseLayerObject *) dev);
 
-    if (!strcmp(funcName, "vkGetDeviceProcAddr"))
+    /* loader uses this to force layer initialization; device object is wrapped */
+    if (!strcmp(funcName, "vkGetDeviceProcAddr")) {
+        initDeviceTable((const VkBaseLayerObject *) dev);
         return (void *) vkGetDeviceProcAddr;
+    }
     if (!strcmp(funcName, "vkDestroyDevice"))
         return (void*) vkDestroyDevice;
     if (!strcmp(funcName, "vkQueueSubmit"))
@@ -2296,11 +2296,13 @@
         return (void*) vkDestroySwapChainWSI;
     if (!strcmp(funcName, "vkGetSwapChainInfoWSI"))
         return (void*) vkGetSwapChainInfoWSI;
-    else {
-        if (devw->pGPA == NULL) {
+    else
+    {
+        VkLayerDispatchTable **ppDisp = (VkLayerDispatchTable **) dev;
+        VkLayerDispatchTable* pTable = tableMap[*ppDisp];
+        if (pTable->GetDeviceProcAddr == NULL)
             return NULL;
-        }
-        return devw->pGPA((VkObject)devw->nextObject, funcName);
+        return pTable->GetDeviceProcAddr(dev, funcName);
     }
 }
 
@@ -2308,25 +2310,28 @@
     VkInstance       instance,
     const char       *funcName)
 {
-    VkBaseLayerObject* instw = (VkBaseLayerObject *) instance;
-
     if (instance == NULL) {
         return NULL;
     }
 
     loader_platform_thread_once(&g_initOnce, initMemTracker);
-    initInstanceTable((const VkBaseLayerObject *) instance);
 
-    if (!strcmp(funcName, "vkGetInstanceProcAddr"))
+    /* loader uses this to force layer initialization; instance object is wrapped */
+    if (!strcmp(funcName, "vkGetInstanceProcAddr")) {
+        initInstanceTable((const VkBaseLayerObject *) instance);
         return (void *) vkGetInstanceProcAddr;
+    }
+
     if (!strcmp(funcName, "vkDestroyInstance"))
         return (void *) vkDestroyInstance;
     if (!strcmp(funcName, "vkCreateDevice"))
         return (void*) vkCreateDevice;
-    else {
-        if (instw->pGPA == NULL) {
+    else
+    {
+        VkLayerInstanceDispatchTable **ppDisp = (VkLayerInstanceDispatchTable **) instance;
+        VkLayerInstanceDispatchTable* pTable = tableInstanceMap[*ppDisp];
+        if (pTable->GetInstanceProcAddr == NULL)
             return NULL;
-        }
-        return instw->pGPA((VkObject)instw->nextObject, funcName);
+        return pTable->GetInstanceProcAddr(instance, funcName);
     }
 }