From c1b4fdff83baba0d624897367a70a7b6b22df6f4 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Sun, 2 May 2021 17:42:19 +0200
Subject: [PATCH] - added a "clearall" instruction to RMAPINFO.

Since, unlike GZDoom, this format is additive and uses defaults for map progression it would otherwise a bit tricky to compile new episodes without accidentally pulling in some original special features.
---
 source/core/g_mapinfo.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/source/core/g_mapinfo.cpp b/source/core/g_mapinfo.cpp
index a04d86e2787..8f25f29fbaa 100644
--- a/source/core/g_mapinfo.cpp
+++ b/source/core/g_mapinfo.cpp
@@ -1162,6 +1162,16 @@ void FMapInfoParser::ParseMapInfo (int lump, MapRecord &gamedefaults, MapRecord
 		{
 			ParseGameInfo();
 		}
+		else if (sc.Compare("clearall"))
+		{
+			// clears all map and progression related data, so that a mod can start with a clean slate.
+			mapList.Clear();
+			volumes.Clear();
+			clusters.Clear();
+			globalCutscenes.DefaultMapIntro = {};
+			globalCutscenes.DefaultMapOutro = {};
+			globalCutscenes.DefaultGameover = {};
+		}
 		else
 		{
 			sc.ScriptError("%s: Unknown top level keyword", sc.String);