Tools/vmap_extractor: Support new 9.2 wmo group splits (child groups should inherit their parent wmo group id)

(cherry picked from commit 8d45d1dd4824fb001b46aeb8ed79bc20b86f2265)

3 files changed, 20 insertions, 2 deletions

diff --git a/src/tools/vmap4_extractor/vmapexport.cpp b/src/tools/vmap4_extractor/vmapexport.cpp
index 1f9945029d9..3aa0bcd8132 100644
--- a/src/tools/vmap4_extractor/vmapexport.cpp
+++ b/src/tools/vmap4_extractor/vmapexport.cpp
@@ -226,20 +226,30 @@ bool ExtractSingleWmo(std::string& fname)
     int Wmo_nVertices = 0;
     uint32 groupCount = 0;
     //printf("root has %d groups\n", froot->nGroups);
+    std::vector<WMOGroup> groups;
+    groups.reserve(froot.groupFileDataIDs.size());
     for (std::size_t i = 0; i < froot.groupFileDataIDs.size(); ++i)
     {
         std::string s = Trinity::StringFormat("FILE{:08X}.xxx", froot.groupFileDataIDs[i]);
-        WMOGroup fgroup(s);
+        WMOGroup& fgroup = groups.emplace_back(s);
         if (!fgroup.open(&froot))
         {
             printf("Could not open all Group file for: %s\n", plain_name);
             file_ok = false;
             break;
         }
+    }
 
+    for (WMOGroup& fgroup : groups)
+    {
         if (fgroup.ShouldSkip(&froot))
             continue;
 
+        if (fgroup.mogpFlags2 & 0x80
+            && fgroup.parentOrFirstChildSplitGroupIndex >= 0
+            && fgroup.parentOrFirstChildSplitGroupIndex < groups.size())
+            fgroup.groupWMOID = groups[fgroup.parentOrFirstChildSplitGroupIndex].groupWMOID;
+
         Wmo_nVertices += fgroup.ConvertToVMAPGroupWmo(output, preciseVectorData);
         ++groupCount;
         for (uint16 groupReference : fgroup.DoodadReferences)
diff --git a/src/tools/vmap4_extractor/wmo.cpp b/src/tools/vmap4_extractor/wmo.cpp
index 4301e758cb5..d883ab3597e 100644
--- a/src/tools/vmap4_extractor/wmo.cpp
+++ b/src/tools/vmap4_extractor/wmo.cpp
@@ -249,7 +249,10 @@ bool WMOGroup::open(WMORoot* rootWMO)
             f.read(&nBatchC, 4);
             f.read(&fogIdx, 4);
             f.read(&groupLiquid, 4);
-            f.read(&groupWMOID,4);
+            f.read(&groupWMOID, 4);
+            f.read(&mogpFlags2, 4);
+            f.read(&parentOrFirstChildSplitGroupIndex, 2);
+            f.read(&nextSplitChildGroupIndex, 2);
 
             // according to WoW.Dev Wiki:
             if (rootWMO->flags & 4)
diff --git a/src/tools/vmap4_extractor/wmo.h b/src/tools/vmap4_extractor/wmo.h
index 4e149c02422..4215b228b4e 100644
--- a/src/tools/vmap4_extractor/wmo.h
+++ b/src/tools/vmap4_extractor/wmo.h
@@ -141,6 +141,9 @@ public:
     uint16 nBatchA;
     uint16 nBatchB;
     uint32 nBatchC, fogIdx, groupLiquid, groupWMOID;
+    uint32 mogpFlags2;
+    int16 parentOrFirstChildSplitGroupIndex;
+    int16 nextSplitChildGroupIndex;
 
     int moba_size;
     int LiquEx_size;
@@ -151,6 +154,8 @@ public:
     std::vector<uint16> DoodadReferences;
 
     WMOGroup(std::string const& filename);
+    WMOGroup(WMOGroup&&) = default;
+    WMOGroup& operator=(WMOGroup&&) = default;
     ~WMOGroup();
 
     bool open(WMORoot* rootWMO);