From 3bfb8284b868c580b5ec15e732c1d6b379168c2f Mon Sep 17 00:00:00 2001
From: Vitaliy <numzer0@yandex.ru>
Date: Wed, 12 Dec 2018 02:02:09 +0300
Subject: [PATCH] =?UTF-8?q?Make=20MapNode=20handle=20paramtype2=E2=89=A0le?=
 =?UTF-8?q?veled=20properly=20(#7958)?=
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---
 src/mapnode.cpp | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/src/mapnode.cpp b/src/mapnode.cpp
index ffba2f59..4cc9985c 100644
--- a/src/mapnode.cpp
+++ b/src/mapnode.cpp
@@ -611,41 +611,44 @@ u8 MapNode::getLevel(const NodeDefManager *nodemgr) const
 		return getParam2() & LIQUID_LEVEL_MASK;
 	if(f.liquid_type == LIQUID_FLOWING) // can remove if all param_type_2 setted
 		return getParam2() & LIQUID_LEVEL_MASK;
-	if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
-		 u8 level = getParam2() & LEVELED_MASK;
-		 if(level)
+	if (f.param_type_2 == CPT2_LEVELED) {
+		u8 level = getParam2() & LEVELED_MASK;
+		if (level)
 			return level;
-		 if(f.leveled > LEVELED_MAX)
-		 	return LEVELED_MAX;
-		 return f.leveled; //default
 	}
-	return 0;
+	if (f.leveled > LEVELED_MAX)
+		return LEVELED_MAX;
+	return f.leveled;
 }
 
 u8 MapNode::setLevel(const NodeDefManager *nodemgr, s8 level)
 {
 	u8 rest = 0;
-	if (level < 1) {
-		setContent(CONTENT_AIR);
-		return 0;
-	}
 	const ContentFeatures &f = nodemgr->get(*this);
 	if (f.param_type_2 == CPT2_FLOWINGLIQUID
-		|| f.liquid_type == LIQUID_FLOWING
-		|| f.liquid_type == LIQUID_SOURCE) {
+			|| f.liquid_type == LIQUID_FLOWING
+			|| f.liquid_type == LIQUID_SOURCE) {
+		if (level <= 0) { // liquid can’t exist with zero level
+			setContent(CONTENT_AIR);
+			return 0;
+		}
 		if (level >= LIQUID_LEVEL_SOURCE) {
 			rest = level - LIQUID_LEVEL_SOURCE;
 			setContent(nodemgr->getId(f.liquid_alternative_source));
+			setParam2(0);
 		} else {
 			setContent(nodemgr->getId(f.liquid_alternative_flowing));
-			setParam2(level & LIQUID_LEVEL_MASK);
+			setParam2((level & LIQUID_LEVEL_MASK) | (getParam2() & ~LIQUID_LEVEL_MASK));
 		}
-	} else if (f.leveled || f.param_type_2 == CPT2_LEVELED) {
-		if (level > LEVELED_MAX) {
+	} else if (f.param_type_2 == CPT2_LEVELED) {
+		if (level < 0) { // zero means default for a leveled nodebox
+			rest = level;
+			level = 0;
+		} else if (level > LEVELED_MAX) {
 			rest = level - LEVELED_MAX;
 			level = LEVELED_MAX;
 		}
-		setParam2(level & LEVELED_MASK);
+		setParam2((level & LEVELED_MASK) | (getParam2() & ~LEVELED_MASK));
 	}
 	return rest;
 }
@@ -653,7 +656,6 @@ u8 MapNode::setLevel(const NodeDefManager *nodemgr, s8 level)
 u8 MapNode::addLevel(const NodeDefManager *nodemgr, s8 add)
 {
 	s8 level = getLevel(nodemgr);
-	if (add == 0) level = 1;
 	level += add;
 	return setLevel(nodemgr, level);
 }