Improve LuaEntity velocity/acceleration handling (by kahrl); implement staticdata interface to Lua

data/mods/default/init.lua

@@ -101,6 +101,7 @@ end
 -- - add_node(pos, node)
 -- - remove_node(pos)
 -- - get_node(pos)
+-- - add_luaentity(pos, name)
 --
 -- ObjectRef is basically ServerActiveObject.
 -- ObjectRef methods:
@@ -114,6 +115,12 @@ end
 -- - Functions receive a "luaentity" as self:
 --   - It has the member .object, which is an ObjectRef pointing to the object
 --   - The original prototype stuff is visible directly via a metatable
+-- - Callbacks:
+--   - on_activate(self, staticdata)
+--   - on_step(self, dtime)
+--   - on_punch(self, hitter)
+--   - on_rightclick(self, clicker)
+--   - get_staticdata(self): return string
 --
 -- MapNode representation:
 -- {name="name", param1=num, param2=num}
@@ -654,11 +661,20 @@ local TNT = {
 	--textures = {"mese.png^[forcesingle"},
 	-- Initial value for our timer
 	timer = 0,
+	-- Number of punches required to defuse
+	health = 3,
 	-- List names of state variables, for serializing object state
 	-- (NOTE: not implemented and implementation will not be like this)
 	-- state_variables = {"timer"},
 }
 
+-- Called when a TNT object is created
+function TNT:on_activate(staticdata)
+	print("TNT:on_activate()")
+	self.object:setvelocity({x=0, y=1, z=0})
+	self.object:setacceleration({x=0, y=-5, z=0})
+end
+
 -- Called periodically
 function TNT:on_step(dtime)
 	--print("TNT:on_step()")
@@ -667,15 +683,18 @@ end
 -- Called when object is punched
 function TNT:on_punch(hitter)
 	print("TNT:on_punch()")
-	self.object:remove()
-	hitter:add_to_inventory("CraftItem testobject1 1")
+	self.health = self.health - 1
+	if self.health <= 0 then
+		self.object:remove()
+		hitter:add_to_inventory("NodeItem TNT 1")
+	end
 end
 
 -- Called when object is right-clicked
 function TNT:on_rightclick(clicker)
-	pos = self.object:getpos()
-	pos = {x=pos.x, y=pos.y+0.1, z=pos.z}
-	self.object:moveto(pos, false)
+	--pos = self.object:getpos()
+	--pos = {x=pos.x, y=pos.y+0.1, z=pos.z}
+	--self.object:moveto(pos, false)
 end
 
 print("TNT dump: "..dump(TNT))
@@ -694,16 +713,13 @@ function register_falling_node(nodename, texture)
 		visual = "cube",
 		textures = {texture,texture,texture,texture,texture,texture},
 		-- State
-		fallspeed = 0,
 		-- Methods
 		on_step = function(self, dtime)
-			-- Apply gravity manually
-			self.fallspeed = self.fallspeed + dtime * 5
-			fp = self.object:getpos()
-			fp.y = fp.y - self.fallspeed * dtime
-			self.object:moveto(fp, true)
+			-- Set gravity
+			self.object:setacceleration({x=0, y=-10, z=0})
 			-- Turn to actual sand when collides to ground or just move
-			bcp = {x=fp.x, y=fp.y-0.5, z=fp.z} -- Position of bottom center point
+			pos = self.object:getpos()
+			bcp = {x=pos.x, y=pos.y-0.5, z=pos.z} -- Position of bottom center point
 			bcn = minetest.env:get_node(bcp)
 			if bcn.name ~= "air" then
 				-- Turn to a sand node
@@ -772,6 +788,16 @@ function on_dignode(p, node)
 end
 minetest.register_on_dignode(on_dignode)
 
+function on_punchnode(p, node)
+	print("on_punchnode")
+	if node.name == "TNT" then
+		minetest.env:remove_node(p)
+		minetest.env:add_luaentity(p, "TNT")
+		nodeupdate(p)
+	end
+end
+minetest.register_on_punchnode(on_punchnode)
+
 --
 -- Done, print some random stuff
 --

src/content_cao.cpp

@@ -1278,6 +1278,8 @@ LuaEntityCAO::LuaEntityCAO(IGameDef *gamedef):
 	m_meshnode(NULL),
 	m_spritenode(NULL),
 	m_position(v3f(0,10*BS,0)),
+	m_velocity(v3f(0,0,0)),
+	m_acceleration(v3f(0,0,0)),
 	m_yaw(0),
 	m_prop(new LuaEntityProperties)
 {
@@ -1455,6 +1457,9 @@ void LuaEntityCAO::updateNodePos()
 
 void LuaEntityCAO::step(float dtime, ClientEnvironment *env)
 {
+	m_position += dtime * m_velocity + 0.5 * dtime * dtime * m_acceleration;
+	m_velocity += dtime * m_acceleration;
+	pos_translator.update(m_position, pos_translator.aim_is_end, pos_translator.anim_time);
 	pos_translator.translate(dtime);
 	updateNodePos();
 }
@@ -1471,6 +1476,10 @@ void LuaEntityCAO::processMessage(const std::string &data)
 		bool do_interpolate = readU8(is);
 		// pos
 		m_position = readV3F1000(is);
+		// velocity
+		m_velocity = readV3F1000(is);
+		// acceleration
+		m_acceleration = readV3F1000(is);
 		// yaw
 		m_yaw = readF1000(is);
 		// is_end_position (for interpolation)

src/content_cao.h

@@ -428,6 +428,8 @@ private:
 	scene::IMeshSceneNode *m_meshnode;
 	scene::MyBillboardSceneNode *m_spritenode;
 	v3f m_position;
+	v3f m_velocity;
+	v3f m_acceleration;
 	float m_yaw;
 	struct LuaEntityProperties *m_prop;
 	SmoothTranslator pos_translator;

src/content_sao.cpp

@@ -1550,6 +1550,8 @@ LuaEntitySAO::LuaEntitySAO(ServerEnvironment *env, v3f pos,
 	m_init_state(state),
 	m_registered(false),
 	m_prop(new LuaEntityProperties),
+	m_velocity(0,0,0),
+	m_acceleration(0,0,0),
 	m_yaw(0),
 	m_last_sent_yaw(0),
 	m_last_sent_position(0,0,0),
@@ -1610,6 +1612,9 @@ void LuaEntitySAO::step(float dtime, bool send_recommended)
 {
 	m_last_sent_position_timer += dtime;
 	
+	m_base_position += dtime * m_velocity + 0.5 * dtime * dtime * m_acceleration;
+	m_velocity += dtime * m_acceleration;
+
 	if(m_registered){
 		lua_State *L = m_env->getLua();
 		scriptapi_luaentity_step(L, m_id, dtime);
@@ -1618,6 +1623,7 @@ void LuaEntitySAO::step(float dtime, bool send_recommended)
 	if(send_recommended == false)
 		return;
 	
+	// TODO: force send when velocity/acceleration changes enough
 	float minchange = 0.2*BS;
 	if(m_last_sent_position_timer > 1.0){
 		minchange = 0.01*BS;
@@ -1659,7 +1665,7 @@ std::string LuaEntitySAO::getStaticData()
 	// state
 	if(m_registered){
 		lua_State *L = m_env->getLua();
-		std::string state = scriptapi_luaentity_get_state(L, m_id);
+		std::string state = scriptapi_luaentity_get_staticdata(L, m_id);
 		os<<serializeLongString(state);
 	} else {
 		os<<serializeLongString(m_init_state);
@@ -1709,6 +1715,16 @@ float LuaEntitySAO::getMinimumSavedMovement()
 	return 0.1 * BS;
 }
 
+void LuaEntitySAO::setVelocity(v3f velocity)
+{
+	m_velocity = velocity;
+}
+
+void LuaEntitySAO::setAcceleration(v3f acceleration)
+{
+	m_acceleration = acceleration;
+}
+
 void LuaEntitySAO::sendPosition(bool do_interpolate, bool is_movement_end)
 {
 	m_last_sent_move_precision = m_base_position.getDistanceFrom(
@@ -1716,6 +1732,8 @@ void LuaEntitySAO::sendPosition(bool do_interpolate, bool is_movement_end)
 	m_last_sent_position_timer = 0;
 	m_last_sent_yaw = m_yaw;
 	m_last_sent_position = m_base_position;
+	//m_last_sent_velocity = m_velocity;
+	//m_last_sent_acceleration = m_acceleration;
 
 	float update_interval = m_env->getSendRecommendedInterval();
 
@@ -1727,6 +1745,10 @@ void LuaEntitySAO::sendPosition(bool do_interpolate, bool is_movement_end)
 	writeU8(os, do_interpolate);
 	// pos
 	writeV3F1000(os, m_base_position);
+	// velocity
+	writeV3F1000(os, m_velocity);
+	// acceleration
+	writeV3F1000(os, m_acceleration);
 	// yaw
 	writeF1000(os, m_yaw);
 	// is_end_position (for interpolation)

src/content_sao.h

@@ -216,6 +216,8 @@ public:
 	void setPos(v3f pos);
 	void moveTo(v3f pos, bool continuous);
 	float getMinimumSavedMovement();
+	void setVelocity(v3f velocity);
+	void setAcceleration(v3f acceleration);
 private:
 	void sendPosition(bool do_interpolate, bool is_movement_end);
 
@@ -224,6 +226,8 @@ private:
 	bool m_registered;
 	struct LuaEntityProperties *m_prop;
 	
+	v3f m_velocity;
+	v3f m_acceleration;
 	float m_yaw;
 	float m_last_sent_yaw;
 	v3f m_last_sent_position;

src/scriptapi.cpp

@@ -61,6 +61,7 @@ TODO:
 	meta.set("owner", playername)
 	meta.get("owner")
 - Item definition (actually, only CraftItem)
+- (not scripting) Putting items in node metadata (virtual)
 */
 
 static void stackDump(lua_State *L, std::ostream &o)
@@ -424,24 +425,21 @@ static int l_register_craft(lua_State *L)
 	return 0; /* number of results */
 }
 
-// Register a global step function
-// register_globalstep(function)
-static int l_register_globalstep(lua_State *L)
+static int register_lua_callback(lua_State *L, const char *tablename)
 {
 	luaL_checktype(L, 1, LUA_TFUNCTION);
-	infostream<<"register_globalstep"<<std::endl;
 
 	lua_getglobal(L, "table");
 	lua_getfield(L, -1, "insert");
 	int table_insert = lua_gettop(L);
 	// Get minetest.registered_globalsteps
 	lua_getglobal(L, "minetest");
-	lua_getfield(L, -1, "registered_globalsteps");
+	lua_getfield(L, -1, tablename);
 	luaL_checktype(L, -1, LUA_TTABLE);
-	int registered_globalsteps = lua_gettop(L);
+	int registered = lua_gettop(L);
 	// table.insert(registered_globalsteps, func)
 	lua_pushvalue(L, table_insert);
-	lua_pushvalue(L, registered_globalsteps);
+	lua_pushvalue(L, registered);
 	lua_pushvalue(L, 1); // push function from argument 1
 	// Call insert
 	if(lua_pcall(L, 2, 0, 0))
@@ -450,54 +448,33 @@ static int l_register_globalstep(lua_State *L)
 	return 0; /* number of results */
 }
 
+// Register a global step function
+// register_globalstep(function)
+static int l_register_globalstep(lua_State *L)
+{
+	infostream<<"register_globalstep"<<std::endl;
+	return register_lua_callback(L, "registered_globalsteps");
+}
+
 // register_on_placenode(function)
 static int l_register_on_placenode(lua_State *L)
 {
-	luaL_checktype(L, 1, LUA_TFUNCTION);
 	infostream<<"register_on_placenode"<<std::endl;
-
-	lua_getglobal(L, "table");
-	lua_getfield(L, -1, "insert");
-	int table_insert = lua_gettop(L);
-	// Get minetest.registered_on_placenodes
-	lua_getglobal(L, "minetest");
-	lua_getfield(L, -1, "registered_on_placenodes");
-	luaL_checktype(L, -1, LUA_TTABLE);
-	int registered_on_placenodes = lua_gettop(L);
-	// table.insert(registered_on_placenodes, func)
-	lua_pushvalue(L, table_insert);
-	lua_pushvalue(L, registered_on_placenodes);
-	lua_pushvalue(L, 1); // push function from argument 1
-	// Call insert
-	if(lua_pcall(L, 2, 0, 0))
-		script_error(L, "error: %s\n", lua_tostring(L, -1));
-
-	return 0; /* number of results */
+	return register_lua_callback(L, "registered_on_placenodes");
 }
 
 // register_on_dignode(function)
 static int l_register_on_dignode(lua_State *L)
 {
-	luaL_checktype(L, 1, LUA_TFUNCTION);
 	infostream<<"register_on_dignode"<<std::endl;
+	return register_lua_callback(L, "registered_on_dignodes");
+}
 
-	lua_getglobal(L, "table");
-	lua_getfield(L, -1, "insert");
-	int table_insert = lua_gettop(L);
-	// Get minetest.registered_on_dignodes
-	lua_getglobal(L, "minetest");
-	lua_getfield(L, -1, "registered_on_dignodes");
-	luaL_checktype(L, -1, LUA_TTABLE);
-	int registered_on_dignodes = lua_gettop(L);
-	// table.insert(registered_on_dignodes, func)
-	lua_pushvalue(L, table_insert);
-	lua_pushvalue(L, registered_on_dignodes);
-	lua_pushvalue(L, 1); // push function from argument 1
-	// Call insert
-	if(lua_pcall(L, 2, 0, 0))
-		script_error(L, "error: %s\n", lua_tostring(L, -1));
-
-	return 0; /* number of results */
+// register_on_punchnode(function)
+static int l_register_on_punchnode(lua_State *L)
+{
+	infostream<<"register_on_punchnode"<<std::endl;
+	return register_lua_callback(L, "registered_on_punchnodes");
 }
 
 static const struct luaL_Reg minetest_f [] = {
@@ -508,6 +485,7 @@ static const struct luaL_Reg minetest_f [] = {
 	{"register_globalstep", l_register_globalstep},
 	{"register_on_placenode", l_register_on_placenode},
 	{"register_on_dignode", l_register_on_dignode},
+	{"register_on_punchnode", l_register_on_punchnode},
 	{NULL, NULL}
 };
 
@@ -583,8 +561,9 @@ private:
 		// content
 		MapNode n = readnode(L, 3, env->getGameDef()->ndef());
 		// Do it
-		env->getMap().addNodeWithEvent(pos, n);
-		return 0;
+		bool succeeded = env->getMap().addNodeWithEvent(pos, n);
+		lua_pushboolean(L, succeeded);
+		return 1;
 	}
 
 	// EnvRef:remove_node(pos)
@@ -598,8 +577,9 @@ private:
 		// pos
 		v3s16 pos = readpos(L, 2);
 		// Do it
-		env->getMap().removeNodeWithEvent(pos);
-		return 0;
+		bool succeeded = env->getMap().removeNodeWithEvent(pos);
+		lua_pushboolean(L, succeeded);
+		return 1;
 	}
 
 	// EnvRef:get_node(pos)
@@ -810,6 +790,32 @@ private:
 		return 0;
 	}
 
+	// setvelocity(self, velocity)
+	static int l_setvelocity(lua_State *L)
+	{
+		ObjectRef *ref = checkobject(L, 1);
+		LuaEntitySAO *co = getluaobject(ref);
+		if(co == NULL) return 0;
+		// pos
+		v3f pos = readFloatPos(L, 2);
+		// Do it
+		co->setVelocity(pos);
+		return 0;
+	}
+	
+	// setacceleration(self, acceleration)
+	static int l_setacceleration(lua_State *L)
+	{
+		ObjectRef *ref = checkobject(L, 1);
+		LuaEntitySAO *co = getluaobject(ref);
+		if(co == NULL) return 0;
+		// pos
+		v3f pos = readFloatPos(L, 2);
+		// Do it
+		co->setAcceleration(pos);
+		return 0;
+	}
+	
 	// add_to_inventory(self, itemstring)
 	// returns: true if item was added, false otherwise
 	static int l_add_to_inventory(lua_State *L)
@@ -902,6 +908,8 @@ const luaL_reg ObjectRef::methods[] = {
 	method(ObjectRef, getpos),
 	method(ObjectRef, setpos),
 	method(ObjectRef, moveto),
+	method(ObjectRef, setvelocity),
+	method(ObjectRef, setacceleration),
 	method(ObjectRef, add_to_inventory),
 	{0,0}
 };
@@ -957,6 +965,9 @@ void scriptapi_export(lua_State *L, Server *server)
 	lua_newtable(L);
 	lua_setfield(L, -2, "registered_on_dignodes");
 
+	lua_newtable(L);
+	lua_setfield(L, -2, "registered_on_punchnodes");
+
 	lua_newtable(L);
 	lua_setfield(L, -2, "object_refs");
 
@@ -1159,12 +1170,45 @@ void scriptapi_environment_on_dignode(lua_State *L, v3s16 p, MapNode oldnode)
 	}
 }
 
+void scriptapi_environment_on_punchnode(lua_State *L, v3s16 p, MapNode oldnode)
+{
+	realitycheck(L);
+	assert(lua_checkstack(L, 20));
+	//infostream<<"scriptapi_environment_on_punchnode"<<std::endl;
+	StackUnroller stack_unroller(L);
+
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
+	Server *server = (Server*)lua_touserdata(L, -1);
+	// And get the writable node definition manager from the server
+	IWritableNodeDefManager *ndef =
+			server->getWritableNodeDefManager();
+	
+	// Get minetest.registered_on_punchnodes
+	lua_getglobal(L, "minetest");
+	lua_getfield(L, -1, "registered_on_punchnodes");
+	luaL_checktype(L, -1, LUA_TTABLE);
+	int table = lua_gettop(L);
+	// Foreach
+	lua_pushnil(L);
+	while(lua_next(L, table) != 0){
+		// key at index -2 and value at index -1
+		luaL_checktype(L, -1, LUA_TFUNCTION);
+		// Call function
+		pushpos(L, p);
+		pushnode(L, oldnode, ndef);
+		if(lua_pcall(L, 2, 0, 0))
+			script_error(L, "error: %s\n", lua_tostring(L, -1));
+		// value removed, keep key for next iteration
+	}
+}
+
 /*
 	luaentity
 */
 
 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
-		const char *init_state)
+		const std::string &staticdata)
 {
 	realitycheck(L);
 	assert(lua_checkstack(L, 20));
@@ -1172,8 +1216,6 @@ bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
 			<<name<<"\""<<std::endl;
 	StackUnroller stack_unroller(L);
 	
-	// Create object as a dummy string (TODO: Create properly)
-
 	// Get minetest.registered_entities[name]
 	lua_getglobal(L, "minetest");
 	lua_getfield(L, -1, "registered_entities");
@@ -1213,17 +1255,19 @@ bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
 	lua_pushvalue(L, object); // Copy object to top of stack
 	lua_settable(L, -3);
 	
-	// This callback doesn't really make sense
-	/*// Get on_activate function
+	// Get on_activate function
 	lua_pushvalue(L, object);
 	lua_getfield(L, -1, "on_activate");
-	luaL_checktype(L, -1, LUA_TFUNCTION);
-	lua_pushvalue(L, object); // self
-	// Call with 1 arguments, 0 results
-	if(lua_pcall(L, 1, 0, 0))
-		script_error(L, "error running function %s:on_activate: %s\n",
-				name, lua_tostring(L, -1));*/
-
+	if(!lua_isnil(L, -1)){
+		luaL_checktype(L, -1, LUA_TFUNCTION);
+		lua_pushvalue(L, object); // self
+		lua_pushlstring(L, staticdata.c_str(), staticdata.size());
+		// Call with 2 arguments, 0 results
+		if(lua_pcall(L, 2, 0, 0))
+			script_error(L, "error running function %s:on_activate: %s\n",
+					name, lua_tostring(L, -1));
+	}
+	
 	return true;
 }
 
@@ -1247,13 +1291,33 @@ void scriptapi_luaentity_rm(lua_State *L, u16 id)
 	lua_pop(L, 2); // pop luaentities, minetest
 }
 
-std::string scriptapi_luaentity_get_state(lua_State *L, u16 id)
+std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
 {
 	realitycheck(L);
 	assert(lua_checkstack(L, 20));
-	infostream<<"scriptapi_luaentity_get_state: id="<<id<<std::endl;
+	infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
+	StackUnroller stack_unroller(L);
+
+	// Get minetest.luaentities[id]
+	luaentity_get(L, id);
+	int object = lua_gettop(L);
 	
-	return "";
+	// Get get_staticdata function
+	lua_pushvalue(L, object);
+	lua_getfield(L, -1, "get_staticdata");
+	if(lua_isnil(L, -1))
+		return "";
+	
+	luaL_checktype(L, -1, LUA_TFUNCTION);
+	lua_pushvalue(L, object); // self
+	// Call with 1 arguments, 1 results
+	if(lua_pcall(L, 1, 1, 0))
+		script_error(L, "error running function get_staticdata: %s\n",
+				lua_tostring(L, -1));
+	
+	size_t len=0;
+	const char *s = lua_tolstring(L, -1, &len);
+	return std::string(s, len);
 }
 
 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
@@ -1344,7 +1408,7 @@ void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
 	lua_pushnumber(L, dtime); // dtime
 	// Call with 2 arguments, 0 results
 	if(lua_pcall(L, 2, 0, 0))
-		script_error(L, "error running function 'step': %s\n", lua_tostring(L, -1));
+		script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
 }
 
 // Calls entity:on_punch(ObjectRef puncher)

src/scriptapi.h

@@ -44,13 +44,15 @@ void scriptapi_environment_step(lua_State *L, float dtime);
 void scriptapi_environment_on_placenode(lua_State *L, v3s16 p, MapNode newnode);
 // After removing node
 void scriptapi_environment_on_dignode(lua_State *L, v3s16 p, MapNode oldnode);
+// When punching node
+void scriptapi_environment_on_punchnode(lua_State *L, v3s16 p, MapNode node);
 
 /* luaentity */
 // Returns true if succesfully added into Lua; false otherwise.
 bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name,
-		const char *init_state);
+		const std::string &staticdata);
 void scriptapi_luaentity_rm(lua_State *L, u16 id);
-std::string scriptapi_luaentity_get_state(lua_State *L, u16 id);
+std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id);
 void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
 		LuaEntityProperties *prop);
 void scriptapi_luaentity_step(lua_State *L, u16 id, float dtime);

src/server.cpp

@@ -2501,6 +2501,32 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
 				NOTE: This can be used in the future to check if
 				somebody is cheating, by checking the timing.
 			*/
+			bool cannot_punch_node = false;
+
+			MapNode n(CONTENT_IGNORE);
+
+			try
+			{
+				n = m_env->getMap().getNode(p_under);
+			}
+			catch(InvalidPositionException &e)
+			{
+				infostream<<"Server: Not punching: Node not found."
+						<<" Adding block to emerge queue."
+						<<std::endl;
+				m_emerge_queue.addBlock(peer_id,
+						getNodeBlockPos(p_over), BLOCK_EMERGE_FLAG_FROMDISK);
+				cannot_punch_node = true;
+			}
+
+			if(cannot_punch_node)
+				return;
+
+			/*
+				Run script hook
+			*/
+			scriptapi_environment_on_punchnode(m_lua, p_under, n);
+
 		} // action == 0
 
 		/*