path: root/src/content_sao.cpp

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "content_sao.h"
#include "collision.h"
#include "environment.h"
#include "settings.h"
#include "main.h" // For g_profiler
#include "profiler.h"
#include "serialization.h" // For compressZlib
#include "tool.h" // For ToolCapabilities
#include "gamedef.h"
#include "player.h"
#include "scripting_game.h"
#include "genericobject.h"
#include "util/serialize.h"
#include "util/mathconstants.h"

std::map<u16, ServerActiveObject::Factory> ServerActiveObject::m_types;

/*
	DummyLoadSAO
*/

class DummyLoadSAO : public ServerActiveObject
{
public:
	DummyLoadSAO(ServerEnvironment *env, v3f pos, u8 type):
		ServerActiveObject(env, pos)
	{
		ServerActiveObject::registerType(type, create);
	}
	// Pretend to be the test object (to fool the client)
	u8 getType() const
	{ return ACTIVEOBJECT_TYPE_TEST; }
	// And never save to disk
	bool isStaticAllowed() const
	{ return false; }
	
	static ServerActiveObject* create(ServerEnvironment *env, v3f pos,
			const std::string &data)
	{
		return new DummyLoadSAO(env, pos, 0);
	}

	void step(float dtime, bool send_recommended)
	{
		m_removed = true;
		infostream<<"DummyLoadSAO step"<<std::endl;
	}

	bool getCollisionBox(aabb3f *toset) {
		return false;
	}

	bool collideWithObjects() {
		return false;
	}

private:
};

// Prototype (registers item for deserialization)
DummyLoadSAO proto1_DummyLoadSAO(NULL, v3f(0,0,0), ACTIVEOBJECT_TYPE_RAT);
DummyLoadSAO proto2_DummyLoadSAO(NULL, v3f(0,0,0), ACTIVEOBJECT_TYPE_OERKKI1);
DummyLoadSAO proto3_DummyLoadSAO(NULL, v3f(0,0,0), ACTIVEOBJECT_TYPE_FIREFLY);
DummyLoadSAO proto4_DummyLoadSAO(NULL, v3f(0,0,0), ACTIVEOBJECT_TYPE_MOBV2);

/*
	TestSAO
*/

class TestSAO : public ServerActiveObject
{
public:
	TestSAO(ServerEnvironment *env, v3f pos):
		ServerActiveObject(env, pos),
		m_timer1(0),
		m_age(0)
	{
		ServerActiveObject::registerType(getType(), create);
	}
	u8 getType() const
	{ return ACTIVEOBJECT_TYPE_TEST; }
	
	static ServerActiveObject* create(ServerEnvironment *env, v3f pos,
			const std::string &data)
	{
		return new TestSAO(env, pos);
	}

	void step(float dtime, bool send_recommended)
	{
		m_age += dtime;
		if(m_age > 10)
		{
			m_removed = true;
			return;
		}

		m_base_position.Y += dtime * BS * 2;
		if(m_base_position.Y > 8*BS)
			m_base_position.Y = 2*BS;

		if(send_recommended == false)
			return;

		m_timer1 -= dtime;
		if(m_timer1 < 0.0)
		{
			m_timer1 += 0.125;

			std::string data;

			data += itos(0); // 0 = position
			data += " ";
			data += itos(m_base_position.X);
			data += " ";
			data += itos(m_base_position.Y);
			data += " ";
			data += itos(m_base_position.Z);

			ActiveObjectMessage aom(getId(), false, data);
			m_messages_out.push_back(aom);
		}
	}

	bool getCollisionBox(aabb3f *toset) {
		return false;
	}

	bool collideWithObjects() {
		return false;
	}

private:
	float m_timer1;
	float m_age;
};

// Prototype (registers item for deserialization)
TestSAO proto_TestSAO(NULL, v3f(0,0,0));

/*
	ItemSAO

	DEPRECATED: New dropped items are implemented in Lua; see
	            builtin/item_entity.lua.
*/

class ItemSAO : public ServerActiveObject
{
public:
	u8 getType() const
	{ return ACTIVEOBJECT_TYPE_ITEM; }
	
	float getMinimumSavedMovement()
	{ return 0.1*BS; }

	static ServerActiveObject* create(ServerEnvironment *env, v3f pos,
			const std::string &data)
	{
		std::istringstream is(data, std::ios::binary);
		char buf[1];
		// read version
		is.read(buf, 1);
		u8 version = buf[0];
		// check if version is supported
		if(version != 0)
			return NULL;
		std::string itemstring = deSerializeString(is);
		infostream<<"create(): Creating item \""
				<<itemstring<<"\""<<std::endl;
		return new ItemSAO(env, pos, itemstring);
	}

	ItemSAO(ServerEnvironment *env, v3f pos,
			const std::string itemstring):
		ServerActiveObject(env, pos),
		m_itemstring(itemstring),
		m_itemstring_changed(false),
		m_speed_f(0,0,0),
		m_last_sent_position(0,0,0)
	{
		ServerActiveObject::registerType(getType(), create);
	}

	void step(float dtime, bool send_recommended)
	{
		ScopeProfiler sp2(g_profiler, "step avg", SPT_AVG);

		assert(m_env);

		const float interval = 0.2;
		if(m_move_interval.step(dtime, interval)==false)
			return;
		dtime = interval;
		
		core::aabbox3d<f32> box(-BS/3.,0.0,-BS/3., BS/3.,BS*2./3.,BS/3.);
		collisionMoveResult moveresult;
		// Apply gravity
		m_speed_f += v3f(0, -dtime*9.81*BS, 0);
		// Maximum movement without glitches
		f32 pos_max_d = BS*0.25;
		// Limit speed
		if(m_speed_f.getLength()*dtime > pos_max_d)
			m_speed_f *= pos_max_d / (m_speed_f.getLength()*dtime);
		v3f pos_f = getBasePosition();
		v3f pos_f_old = pos_f;
		v3f accel_f = v3f(0,0,0);
		f32 stepheight = 0;
		moveresult = collisionMoveSimple(m_env,m_env->getGameDef(),
				pos_max_d, box, stepheight, dtime,
				pos_f, m_speed_f, accel_f);
		
		if(send_recommended == false)
			return;

		if(pos_f.getDistanceFrom(m_last_sent_position) > 0.05*BS)
		{
			setBasePosition(pos_f);
			m_last_sent_position = pos_f;

			std::ostringstream os(std::ios::binary);
			// command (0 = update position)
			writeU8(os, 0);
			// pos
			writeV3F1000(os, m_base_position);
			// create message and add to list
			ActiveObjectMessage aom(getId(), false, os.str());
			m_messages_out.push_back(aom);
		}
		if(m_itemstring_changed)
		{
			m_itemstring_changed = false;

			std::ostringstream os(std::ios::binary);
			// command (1 = update itemstring)
			writeU8(os, 1);
			// itemstring
			os<<serializeString(m_itemstring);
			// create message and add to list
			ActiveObjectMessage aom(getId(), false, os.str());
			m_messages_out.push_back(aom);
		}
	}

	std::string getClientInitializationData(u16 protocol_version)
	{
		std::ostringstream os(std::ios::binary);
		// version
		writeU8(os, 0);
		// pos
		writeV3F1000(os, m_base_position);
		// itemstring
		os<<serializeString(m_itemstring);
		return os.str();
	}

	std::string getStaticData()
	{
		infostream<<__FUNCTION_NAME<<std::endl;
		std::ostringstream os(std::ios::binary);
		// version
		writeU8(os, 0);