Support hooking GetProcAddress for ordinals. Used for delay-load d3d12

renderdoc/os/win32/win32_hook.cpp

@@ -474,7 +474,7 @@ FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, LPCSTR func)
   if(mod == NULL || func == NULL)
     return (FARPROC)NULL;
 
-  if(mod == s_HookData->ownmodule || OrdinalAsString((void *)func))
+  if(mod == s_HookData->ownmodule)
     return GetProcAddress(mod, func);
 
   for(auto it = s_HookData->DllHooks.begin(); it != s_HookData->DllHooks.end(); ++it)
@@ -484,6 +484,29 @@ FARPROC WINAPI Hooked_GetProcAddress(HMODULE mod, LPCSTR func)
 
     if(mod == it->second.module)
     {
+      if(OrdinalAsString((void *)func))
+      {
+        uint32_t ordinal = (uint16_t)func;
+
+        if(ordinal < it->second.OrdinalBase)
+        {
+          RDCERR("Unexpected ordinal - lower than ordinalbase %u for %s",
+                 (uint32_t)it->second.OrdinalBase, it->first.c_str());
+          return GetProcAddress(mod, func);
+        }
+
+        ordinal -= it->second.OrdinalBase;
+
+        if(ordinal >= it->second.OrdinalNames.size())
+        {
+          RDCERR("Unexpected ordinal - higher than fetched ordinal names (%u) for %s",
+                 (uint32_t)it->second.OrdinalNames.size(), it->first.c_str());
+          return GetProcAddress(mod, func);
+        }
+
+        func = it->second.OrdinalNames[ordinal].c_str();
+      }
+
       FunctionHook search(func, NULL, NULL);
 
       auto found =