ContentCAO: Fix broken attachments on join (#8701)

What happened:
1) Object data is received. Client begins to read the data
2) Client initializes all its children (gob_cmd_update_infant)
3) Children try to attach to parent (yet not added)
4) Parent initializes, is added to the environment

And somewhere in between, Irrlicht wrecks up the attachments due to the missing matrix node.

The solution here is to:
1) Use the same structure as ServerActiveObject
2) Attach all children after the parent is really initialized

1 files changed, 12 insertions, 0 deletions

diff --git a/src/activeobject.h b/src/activeobject.h
index b6a0e67af..a319ef904 100644
--- a/src/activeobject.h
+++ b/src/activeobject.h
@@ -20,8 +20,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #pragma once
 
 #include "irr_aabb3d.h"
+#include "irr_v3d.h"
 #include <string>
 
+
 enum ActiveObjectType {
 	ACTIVEOBJECT_TYPE_INVALID = 0,
 	ACTIVEOBJECT_TYPE_TEST = 1,
@@ -98,6 +100,16 @@ public:
 
 
 	virtual bool collideWithObjects() const = 0;
+
+
+	virtual void setAttachment(int parent_id, const std::string &bone, v3f position,
+			v3f rotation) {}
+	virtual void getAttachment(int *parent_id, std::string *bone, v3f *position,
+			v3f *rotation) const {}
+	virtual void clearChildAttachments() {}
+	virtual void clearParentAttachment() {}
+	virtual void addAttachmentChild(int child_id) {}
+	virtual void removeAttachmentChild(int child_id) {}
 protected:
 	u16 m_id; // 0 is invalid, "no id"
 };