src/light.h


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/*
Minetest-c55
Copyright (C) 2010 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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.

You should have received a copy of the GNU 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.
*/

#ifndef LIGHT_HEADER
#define LIGHT_HEADER

#include "common_irrlicht.h"
#include "debug.h"

/*
	Day/night cache:
	Meshes are cached for different day-to-night transition values
*/

/*#define DAYNIGHT_CACHE_COUNT 3
// First one is day, last one is night.
extern u32 daynight_cache_ratios[DAYNIGHT_CACHE_COUNT];*/

/*
	Lower level lighting stuff
*/

// This directly sets the range of light.
// Actually this is not the real maximum, and this is not the
// brightest. The brightest is LIGHT_SUN.
#define LIGHT_MAX 14
// Light is stored as 4 bits, thus 15 is the maximum.
// This brightness is reserved for sunlight
#define LIGHT_SUN 15

inline u8 diminish_light(u8 light)
{
	if(light == 0)
		return 0;
	if(light >= LIGHT_MAX)
		return LIGHT_MAX - 1;
		
	return light - 1;
}

inline u8 diminish_light(u8 light, u8 distance)
{
	if(distance >= light)
		return 0;
	return  light - distance;
}

inline u8 undiminish_light(u8 light)
{
	// We don't know if light should undiminish from this particular 0.
	// Thus, keep it at 0.
	if(light == 0)
		return 0;
	if(light == LIGHT_MAX)
		return light;
	
	return light + 1;
}

extern u8 light_decode_table[LIGHT_MAX+1];

inline u8 decode_light(u8 light)
{
	if(light == LIGHT_SUN)
		return light_decode_table[LIGHT_MAX];
	
	if(light > LIGHT_MAX)
		light = LIGHT_MAX;
	
	return light_decode_table[light];
}

#endif
/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2013 Kahrl <kahrl@gmx.net>

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 "itemdef.h"

#include "gamedef.h"
#include "nodedef.h"
#include "tool.h"
#include "inventory.h"
#ifndef SERVER
#include "mapblock_mesh.h"
#include "mesh.h"
#include "tile.h"
#endif
#include "log.h"
#include "main.h" // g_settings
#include "settings.h"
#include "util/serialize.h"
#include "util/container.h"
#include "util/thread.h"
#include <map>
#include <set>

/*
	ItemDefinition
*/
ItemDefinition::ItemDefinition()
{
	resetInitial();
}

ItemDefinition::ItemDefinition(const ItemDefinition &def)
{
	resetInitial();
	*this = def;
}

ItemDefinition& ItemDefinition::operator=(const ItemDefinition &def)
{
	if(this == &def)
		return *this;

	reset();

	type = def.type;
	name = def.name;
	description = def.description;
	inventory_image = def.inventory_image;
	wield_image = def.wield_image;
	wield_scale = def.wield_scale;
	stack_max = def.stack_max;
	usable = def.usable;
	liquids_pointable = def.liquids_pointable;
	if(def.tool_capabilities)
	{
		tool_capabilities = new ToolCapabilities(
				*def.tool_capabilities);
	}
	groups = def.groups;
	node_placement_prediction = def.node_placement_prediction;
	sound_place = def.sound_place;
	range = def.range;
	return *this;
}

ItemDefinition::~ItemDefinition()
{
	reset();
}

void ItemDefinition::resetInitial()
{
	// Initialize pointers to NULL so reset() does not delete undefined pointers
	tool_capabilities = NULL;
	reset();
}

void ItemDefinition::reset()
{
	type = ITEM_NONE;
	name = "";
	description = "";
	inventory_image = "";
	wield_image = "";
	wield_scale = v3f(1.0, 1.0, 1.0);
	stack_max = 99;
	usable = false;
	liquids_pointable = false;
	if(tool_capabilities)
	{
		delete tool_capabilities;
		tool_capabilities = NULL;
	}
	groups.clear();
	sound_place = SimpleSoundSpec();
	range = -1;

	node_placement_prediction = "";
}

void ItemDefinition::serialize(std::ostream &os, u16 protocol_version) const
{
	if(protocol_version <= 17)
		writeU8(os, 1); // version
	else if(protocol_version <= 20)
		writeU8(os, 2); // version
	else
		writeU8(os, 3); // version
	writeU8(os, type);
	os<<serializeString(name);
	os<<serializeString(description);
	os<<serializeString(inventory_image);
	os<<serializeString(wield_image);
	writeV3F1000(os, wield_scale);
	writeS16(os, stack_max);
	writeU8(os, usable);
	writeU8(os, liquids_pointable);
	std::string tool_capabilities_s = "";
	if(tool_capabilities){
		std::ostringstream tmp_os(std::ios::binary);
		tool_capabilities->serialize(tmp_os, protocol_version);
		tool_capabilities_s = tmp_os.str();
	}
	os<<serializeString(tool_capabilities_s);
	writeU16(os, groups.size());
	for(std::map<std::string, int>::const_iterator
			i = groups.begin(); i != groups.end(); i++){
		os<<serializeString(i->first);
		writeS16(os, i->second);
	}
	os<<serializeString(node_placement_prediction);
	if(protocol_version > 17){
		//serializeSimpleSoundSpec(sound_place, os);
		os<<serializeString(sound_place.name);
		writeF1000(os, sound_place.gain);
	}
	if(protocol_version > 20){
		writeF1000(os, range);
	}
}

void ItemDefinition::deSerialize(std::istream &is)
{
	// Reset everything
	reset();

	// Deserialize
	int version = readU8(is);
	if(version < 1 || version > 3)
		throw SerializationError("unsupported ItemDefinition version");
	type = (enum ItemType)readU8(is);
	name = deSerializeString(is);
	description = deSerializeString(is);
	inventory_image = deSerializeString(is);
	wield_image = deSerializeString(is);
	wield_scale = readV3F1000(is);
	stack_max = readS16(is);
	usable = readU8(is);
	liquids_pointable = readU8(is);
	std::string tool_capabilities_s = deSerializeString(is);
	if(!tool_capabilities_s.empty())
	{
		std::istringstream tmp_is(tool_capabilities_s, std::ios::binary);
		tool_capabilities = new ToolCapabilities;
		tool_capabilities->deSerialize(tmp_is);
	}
	groups.clear();
	u32 groups_size = readU16(is);
	for(u32 i=0; i<groups_size; i++){
		std::string name = deSerializeString(is);
		int value = readS16(is);
		groups[name] = value;
	}
	if(version == 1){
		// We cant be sure that node_placement_prediction is send in version 1
		try{
			node_placement_prediction = deSerializeString(is);
		}catch(SerializationError &e) {};
		// Set the old default sound
		sound_place.name = "default_place_node";
		sound_place.gain = 0.5;
	} else if(version >= 2) {
		node_placement_prediction = deSerializeString(is);
		//deserializeSimpleSoundSpec(sound_place, is);
		sound_place.name = deSerializeString(is);
		sound_place.gain = readF1000(is);
	}
	if(version == 3) {
		range = readF1000(is);
	}
	// If you add anything here, insert it primarily inside the try-catch
	// block to not need to increase the version.
	try{
	}catch(SerializationError &e) {};
}

/*
	CItemDefManager
*/

// SUGG: Support chains of aliases?

class CItemDefManager: public IWritableItemDefManager
{
#ifndef SERVER
	struct ClientCached
	{
		video::ITexture *inventory_texture;
		scene::IMesh *wield_mesh;

		ClientCached():
			inventory_texture(NULL),
			wield_mesh(NULL)
		{}
	};
#endif

public:
	CItemDefManager()
	{

#ifndef SERVER
		m_main_thread = get_current_thread_id();
#endif
		clear();
	}
	virtual ~CItemDefManager()
	{
#ifndef SERVER
		const std::list<ClientCached*> &values = m_clientcached.getValues();
		for(std::list<ClientCached*>::const_iterator
				i = values.begin(); i != values.end(); ++i)
		{
			ClientCached *cc = *i;
			if (cc->wield_mesh)
				cc->wield_mesh->drop();
			delete cc;
		}

#endif
		for (std::map<std::string, ItemDefinition*>::iterator iter =
				m_item_definitions.begin(); iter != m_item_definitions.end();
				iter ++) {
			delete iter->second;
		}
		m_item_definitions.clear();
	}
	virtual const ItemDefinition& get(const std::string &name_) const
	{
		// Convert name according to possible alias
		std::string name = getAlias(name_);
		// Get the definition
		std::map<std::string, ItemDefinition*>::const_iterator i;
		i = m_item_definitions.find(name);
		if(i == m_item_definitions.end())
			i = m_item_definitions.find("unknown");
		assert(i != m_item_definitions.end());
		return *(i->second);
	}
	virtual std::string getAlias(const std::string &name) const
	{
		std::map<std::string, std::string>::const_iterator i;
		i = m_aliases.find(name);
		if(i != m_aliases.end())
			return i->second;
		return name;
	}
	virtual std::set<std::string> getAll() const
	{
		std::set<std::string> result;
		for(std::map<std::string, ItemDefinition*>::const_iterator
				i = m_item_definitions.begin();
				i != m_item_definitions.end(); i++)
		{
			result.insert(i->first);
		}
		for(std::map<std::string, std::string>::const_iterator
				i = m_aliases.begin();
				i != m_aliases.end(); i++)
		{
			result.insert(i->first);
		}
		return result;
	}
	virtual bool isKnown(const std::string &name_) const
	{
		// Convert name according to possible alias
		std::string name = getAlias(name_);
		// Get the definition
		std::map<std::string, ItemDefinition*>::const_iterator i;
		return m_item_definitions.find(name) != m_item_definitions.end();
	}
#ifndef SERVER
public:
	ClientCached* createClientCachedDirect(const std::string &name,
			IGameDef *gamedef) const
	{
		infostream<<"Lazily creating item texture and mesh for \""
				<<name<<"\""<<std::endl;

		// This is not thread-safe
		assert(get_current_thread_id() == m_main_thread);

		// Skip if already in cache
		ClientCached *cc = NULL;
		m_clientcached.get(name, &cc);
		if(cc)
			return cc;

		ITextureSource *tsrc = gamedef->getTextureSource();
		INodeDefManager *nodedef = gamedef->getNodeDefManager();
		IrrlichtDevice *device = tsrc->getDevice();
		video::IVideoDriver *driver = device->getVideoDriver();
		const ItemDefinition *def = &get(name);

		// Create new ClientCached
		cc = new ClientCached();

		bool need_node_mesh = false;

		// Create an inventory texture
		cc->inventory_texture = NULL;
		if(def->inventory_image != "")
		{
			cc->inventory_texture = tsrc->getTexture(def->inventory_image);
		}
		else if(def->type == ITEM_NODE)
		{
			need_node_mesh = true;
		}

		// Create a wield mesh
		assert(cc->wield_mesh == NULL);
		if(def->type == ITEM_NODE && def->wield_image == "")
		{
			need_node_mesh = true;
		}
		else if(def->wield_image != "" || def->inventory_image != "")
		{
			// Extrude the wield image into a mesh

			std::string imagename;
			if(def->wield_image != "")
				imagename = def->wield_image;
			else
				imagename = def->inventory_image;

			cc->wield_mesh = createExtrudedMesh(
					tsrc->getTexture(imagename),
					driver,
					def->wield_scale * v3f(40.0, 40.0, 4.0));
			if(cc->wield_mesh == NULL)
			{