Disable fall damage when "immortal" group set (#6946)

src/clientenvironment.cpp

@@ -32,6 +32,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "raycast.h"
 #include "voxelalgorithms.h"
 #include "settings.h"
+#include "content_cao.h"
 #include <algorithm>
 #include "client/renderingengine.h"
 
@@ -207,6 +208,8 @@ void ClientEnvironment::step(float dtime)
 
 	//std::cout<<"Looped "<<loopcount<<" times."<<std::endl;
 
+	bool player_immortal = lplayer->getCAO() && lplayer->getCAO()->isImmortal();
+
 	for (const CollisionInfo &info : player_collisions) {
 		v3f speed_diff = info.new_speed - info.old_speed;;
 		// Handle only fall damage
@@ -227,7 +230,7 @@ void ClientEnvironment::step(float dtime)
 			pre_factor = 1.0 + (float)addp/100.0;
 		}
 		float speed = pre_factor * speed_diff.getLength();
-		if (speed > tolerance) {
+		if (speed > tolerance && !player_immortal) {
 			f32 damage_f = (speed - tolerance) / BS * post_factor;
 			u8 damage = (u8)MYMIN(damage_f + 0.5, 255);
 			if (damage != 0) {

src/content_cao.cpp

@@ -360,6 +360,11 @@ v3f GenericCAO::getPosition()
 	return pos_translator.vect_show;
 }
 
+const bool GenericCAO::isImmortal()
+{
+	return itemgroup_get(getGroups(), "immortal");
+}
+
 scene::ISceneNode* GenericCAO::getSceneNode()
 {
 	if (m_meshnode) {

src/content_cao.h

@@ -124,7 +124,10 @@ public:
 	{
 		return ACTIVEOBJECT_TYPE_GENERIC;
 	}
-
+	inline const ItemGroupList &getGroups() const
+	{
+		return m_armor_groups;
+	}
 	void initialize(const std::string &data);
 
 	void processInitData(const std::string &data);
@@ -143,6 +146,8 @@ public:
 		return m_yaw;
 	}
 
+	const bool isImmortal();
+
 	scene::ISceneNode *getSceneNode();
 
 	scene::IAnimatedMeshSceneNode *getAnimatedMeshSceneNode();