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Formspec toolkit api 0.0.3
==========================

Formspec toolkit is a set of functions to create basic ui elements.


File: fst/ui.lua
----------------

ui.lua adds base ui interface to add additional components to.

ui.add(component) -> returns name of added component
^ add component to ui
^ component: component to add

ui.delete(component) -> true/false if a component was deleted or not
^ remove a component from ui
^ component: component to delete

ui.set_default(name)
^ set component to show if not a single component is set visible
^ name: name of component to set as default

ui.find_by_name(name) --> returns component or nil
^ find a component within ui
^ name: name of component to look for

File: fst/tabview.lua
---------------------

tabview_create(name, size, tabheaderpos) --> returns tabview component
^ create a new tabview component
^ name: name of tabview (has to be unique per ui)
^ size: size of tabview
	{
		x,
		y
	}
^ tabheaderpos: upper left position of tabheader (relative to upper left fs corner)
	{
		x,
		y
	}

Class reference tabview:

methods:
- add_tab(tab)
  ^ add a tab to this tabview
  ^ tab:
  {
	name               = "tabname",      -- name of tab to create
	caption            = "tab caption",  -- text to show for tab header
	cbf_button_handler = function(tabview, fields, tabname, tabdata), -- callback for button events
	--TODO cbf_events         = function(tabview, event, tabname),           -- callback for events
	cbf_formspec       = function(tabview, name, tabdata),            -- get formspec
	tabsize            =
		{
			x, -- x width
			y  -- y height
		},                                                            -- special size for this tab (only relevant if no parent for tabview set)
	on_change          = function(type,old_tab,new_tab)               -- called on tab chang, type is "ENTER" or "LEAVE"
  }
- set_autosave_tab(value)
  ^ tell tabview to automatically save current tabname as "tabview_name"_LAST
  ^ value: true/false
- set_tab(name)
  ^ set's tab to tab named "name", returns true/false on success
  ^ name: name of tab to set
- set_global_event_handler(handler)
  ^ set a handler to be called prior calling tab specific event handler
  ^ handler: function(tabview,event) --> returns true to finish event processing false to continue
- set_global_button_handler(handler)
  ^ set a handler to be called prior calling tab specific button handler
  ^ handler: function(tabview,fields) --> returns true to finish button processing false to continue
- set_parent(parent)
  ^ set parent to attach tabview to. TV's with parent are hidden if their parent
	is hidden and they don't set their specified size.
  ^ parent: component to attach to
- show()
  ^ show tabview
- hide()
  ^ hide tabview
- delete()
  ^ delete tabview
- set_fixed_size(state)
  ^ true/false set to fixed size, variable size

File: fst/dialog.lua
---------------------
Only one dialog can be shown at a time. If a dialog is closed it's parent is
gonna be activated and shown again.

dialog_create(name, cbf_formspec, cbf_button_handler, cbf_events)
^ create a dialog component
^ name: name of component (unique per ui)
^ cbf_formspec: function to be called to get formspec
	function(dialogdata)
^ cbf_button_handler: function to handle buttons
	function(dialog, fields)
^ cbf_events: function to handle events
	function(dialog, event)

Class reference dialog:

methods:
- set_parent(parent)
  ^ set parent to attach a dialog to
  ^ parent: component to attach to
- show()
  ^ show dialog
- hide()
  ^ hide dialog
- delete()
  ^ delete dialog from ui
  
members:
- data
  ^ variable data attached to this dialog
- parent
  ^ parent component to return to on exit
  
File: fst/buttonbar.lua
-----------------------

buttonbar_create(name, cbf_buttonhandler, pos, orientation, size)
^ create a buttonbar
^ name: name of component (unique per ui)
^ cbf_buttonhandler: function to be called on button pressed
	function(buttonbar,buttonname,buttondata)
^ pos: position relative to upper left of current shown formspec
	{
		x,
		y
	}
^ orientation: "vertical" or "horizontal"
^ size: size of bar
	{
		width,
		height
	}

Class reference buttonbar:

methods:
- add_button(btn_id, caption, button_image)
- set_parent(parent)
  ^ set parent to attach a buttonbar to
  ^ parent: component to attach to
- show()
  ^ show buttonbar
- hide()
  ^ hide buttonbar
- delete()
  ^ delete buttonbar from ui

Developer doc:
==============
Skeleton for any component:
{
	name           = "some id",               -- unique id
	type           = "toplevel",              -- type of component
	                                          -- toplevel: component can be show without additional components
	                                          -- addon:    component is an addon to be shown along toplevel component
	hide           = function(this) end,      -- called to hide the component
	show           = function(this) end,      -- called to show the component
	delete         = function(this) end,      -- called to delete component from ui
	handle_buttons = function(this,fields)    -- called upon button press
	handle_events  = function(this,event)     -- called upon event reception
	get_formspec   = function(this)           -- has to return formspec to be displayed
}
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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 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 "voxel.h"
#include "map.h"
#include "gettime.h"
#include "nodedef.h"
#include "util/timetaker.h"

/*
	Debug stuff
*/
u32 addarea_time = 0;
u32 emerge_time = 0;
u32 emerge_load_time = 0;
u32 clearflag_time = 0;
//u32 getwaterpressure_time = 0;
//u32 spreadwaterpressure_time = 0;
u32 updateareawaterpressure_time = 0;
u32 flowwater_pre_time = 0;


VoxelManipulator::VoxelManipulator():
	m_data(NULL),
	m_flags(NULL)
{
}

VoxelManipulator::~VoxelManipulator()
{
	clear();
	if(m_data)
		delete[] m_data;
	if(m_flags)
		delete[] m_flags;
}

void VoxelManipulator::clear()
{
	// Reset area to volume=0
	m_area = VoxelArea();
	if(m_data)
		delete[] m_data;
	m_data = NULL;
	if(m_flags)
		delete[] m_flags;
	m_flags = NULL;
}

void VoxelManipulator::print(std::ostream &o, INodeDefManager *ndef,
		VoxelPrintMode mode)
{
	v3s16 em = m_area.getExtent();
	v3s16 of = m_area.MinEdge;
	o<<"size: "<<em.X<<"x"<<em.Y<<"x"<<em.Z
	 <<" offset: ("<<of.X<<","<<of.Y<<","<<of.Z<<")"<<std::endl;
	
	for(s32 y=m_area.MaxEdge.Y; y>=m_area.MinEdge.Y; y--)
	{
		if(em.X >= 3 && em.Y >= 3)
		{
			if     (y==m_area.MinEdge.Y+2) o<<"^     ";
			else if(y==m_area.MinEdge.Y+1) o<<"|     ";
			else if(y==m_area.MinEdge.Y+0) o<<"y x-> ";
			else                           o<<"      ";
		}

		for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
		{
			for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
			{
				u8 f = m_flags[m_area.index(x,y,z)];
				char c;
				if(f & VOXELFLAG_NOT_LOADED)
					c = 'N';
				else if(f & VOXELFLAG_INEXISTENT)
					c = 'I';
				else
				{
					c = 'X';
					MapNode n = m_data[m_area.index(x,y,z)];
					content_t m = n.getContent();
					u8 pr = n.param2;
					if(mode == VOXELPRINT_MATERIAL)
					{
						if(m <= 9)
							c = m + '0';
					}
					else if(mode == VOXELPRINT_WATERPRESSURE)
					{
						if(ndef->get(m).isLiquid())
						{
							c = 'w';
							if(pr <= 9)
								c = pr + '0';
						}
						else if(m == CONTENT_AIR)
						{
							c = ' ';
						}
						else
						{
							c = '#';
						}
					}
					else if(mode == VOXELPRINT_LIGHT_DAY)
					{
						if(ndef->get(m).light_source != 0)
							c = 'S';
						else if(ndef->get(m).light_propagates == false)
							c = 'X';
						else
						{
							u8 light = n.getLight(LIGHTBANK_DAY, ndef);
							if(light < 10)
								c = '0' + light;
							else
								c = 'a' + (light-10);
						}
					}
				}
				o<<c;
			}
			o<<' ';
		}
		o<<std::endl;
	}
}

void VoxelManipulator::addArea(VoxelArea area)
{
	// Cancel if requested area has zero volume
	if(area.getExtent() == v3s16(0,0,0))
		return;
	
	// Cancel if m_area already contains the requested area
	if(m_area.contains(area))
		return;
	
	TimeTaker timer("addArea", &addarea_time);

	// Calculate new area
	VoxelArea new_area;
	// New area is the requested area if m_area has zero volume
	if(m_area.getExtent() == v3s16(0,0,0))
	{
		new_area = area;
	}
	// Else add requested area to m_area
	else
	{
		new_area = m_area;
		new_area.addArea(area);
	}

	s32 new_size = new_area.getVolume();

	/*dstream<<"adding area ";
	area.print(dstream);
	dstream<<", old area ";
	m_area.print(dstream);
	dstream<<", new area ";
	new_area.print(dstream);
	dstream<<", new_size="<<new_size;
	dstream<<std::endl;*/

	// Allocate and clear new data
	MapNode *new_data = new MapNode[new_size];
	u8 *new_flags = new u8[new_size];
	for(s32 i=0; i<new_size; i++)
	{
		new_flags[i] = VOXELFLAG_NOT_LOADED;
	}
	
	// Copy old data
	
	for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
	for(s32 y=m_area.MinEdge.Y; y<=m_area.MaxEdge.Y; y++)
	for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
	{
		// If loaded, copy data and flags
		if((m_flags[m_area.index(x,y,z)] & VOXELFLAG_NOT_LOADED) == false)
		{
			new_data[new_area.index(x,y,z)] = m_data[m_area.index(x,y,z)];
			new_flags[new_area.index(x,y,z)] = m_flags[m_area.index(x,y,z)];
		}
	}

	// Replace area, data and flags
	
	m_area = new_area;
	
	MapNode *old_data = m_data;
	u8 *old_flags = m_flags;

	/*dstream<<"old_data="<<(int)old_data<<", new_data="<<(int)new_data
	<<", old_flags="<<(int)m_flags<<", new_flags="<<(int)new_flags<<std::endl;*/

	m_data = new_data;
	m_flags = new_flags;
	
	if(old_data)
		delete[] old_data;
	if(old_flags)
		delete[] old_flags;

	//dstream<<"addArea done"<<std::endl;
}

void VoxelManipulator::copyFrom(MapNode *src, VoxelArea src_area,
		v3s16 from_pos, v3s16 to_pos, v3s16 size)
{
	for(s16 z=0; z<size.Z; z++)
	for(s16 y=0; y<size.Y; y++)
	{
		s32 i_src = src_area.index(from_pos.X, from_pos.Y+y, from_pos.Z+z);
		s32 i_local = m_area.index(to_pos.X, to_pos.Y+y, to_pos.Z+z);
		memcpy(&m_data[i_local], &src[i_src], size.X*sizeof(MapNode));
		memset(&m_flags[i_local], 0, size.X);
	}
}

void VoxelManipulator::copyTo(MapNode *dst, VoxelArea dst_area,
		v3s16 dst_pos, v3s16 from_pos, v3s16 size)
{
	for(s16 z=0; z<size.Z; z++)
	for(s16 y=0; y<size.Y; y++)
	{
		s32 i_dst = dst_area.index(dst_pos.X, dst_pos.Y+y, dst_pos.Z+z);
		s32 i_local = m_area.index(from_pos.X, from_pos.Y+y, from_pos.Z+z);
		memcpy(&dst[i_dst], &m_data[i_local], size.X*sizeof(MapNode));
	}
}

/*
	Algorithms
	-----------------------------------------------------
*/

void VoxelManipulator::clearFlag(u8 flags)
{
	// 0-1ms on moderate area
	TimeTaker timer("clearFlag", &clearflag_time);

	v3s16 s = m_area.getExtent();

	/*dstream<<"clearFlag clearing area of size "
			<<""<<s.X<<"x"<<s.Y<<"x"<<s.Z<<""
			<<std::endl;*/

	//s32 count = 0;

	/*for(s32 z=m_area.MinEdge.Z; z<=m_area.MaxEdge.Z; z++)
	for(s32 y=m_area.MinEdge.Y; y<=m_area.MaxEdge.Y; y++)
	for(s32 x=m_area.MinEdge.X; x<=m_area.MaxEdge.X; x++)
	{
		u8 f = m_flags[m_area.index(x,y,z)];
		m_flags[m_area.index(x,y,z)] &= ~flags;
		if(m_flags[m_area.index(x,y,z)] != f)
			count++;
	}*/

	s32 volume = m_area.getVolume();
	for(s32 i=0; i<volume; i++)
	{
		m_flags[i] &= ~flags;
	}

	/*s32 volume = m_area.getVolume();
	for(s32 i=0; i<volume; i++)
	{
		u8 f = m_flags[i];
		m_flags[i] &= ~flags;
		if(m_flags[i] != f)
			count++;
	}

	dstream<<"clearFlag changed "<<count<<" flags out of "
			<<volume<<" nodes"<<std::endl;*/
}

void VoxelManipulator::unspreadLight(enum LightBank bank, v3s16 p, u8 oldlight,
		core::map<v3s16, bool> & light_sources, INodeDefManager *nodemgr)
{
	v3s16 dirs[6] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};
	
	emerge(VoxelArea(p - v3s16(1,1,1), p + v3s16(1,1,1)));

	// Loop through 6 neighbors
	for(u16 i=0; i<6; i++)
	{
		// Get the position of the neighbor node
		v3s16 n2pos = p + dirs[i];
		
		u32 n2i = m_area.index(n2pos);

		if(m_flags[n2i] & VOXELFLAG_INEXISTENT)
			continue;

		MapNode &n2 = m_data[n2i];
		
		/*
			If the neighbor is dimmer than what was specified
			as oldlight (the light of the previous node)
		*/
		u8 light2 = n2.getLight(bank, nodemgr);
		if(light2 < oldlight)
		{
			/*
				And the neighbor is transparent and it has some light
			*/
			if(nodemgr->get(n2).light_propagates && light2 != 0)
			{
				/*
					Set light to 0 and add to queue
				*/

				n2.setLight(bank, 0, nodemgr);
				
				unspreadLight(bank, n2pos, light2, light_sources, nodemgr);
				
				/*
					Remove from light_sources if it is there
					NOTE: This doesn't happen nearly at all
				*/
				/*if(light_sources.find(n2pos))
				{
					std::cout<<"Removed from light_sources"<<std::endl;
					light_sources.remove(n2pos);
				}*/
			}
		}
		else{
			light_sources.insert(n2pos, true);
		}
	}
}

#if 1
/*
	Goes recursively through the neighbours of the node.

	Alters only transparent nodes.

	If the lighting of the neighbour is lower than the lighting of
	the node was (before changing it to 0 at the step before), the
	lighting of the neighbour is set to 0 and then the same stuff
	repeats for the neighbour.

	The ending nodes of the routine are stored in light_sources.
	This is useful when a light is removed. In such case, this
	routine can be called for the light node and then again for
	light_sources to re-light the area without the removed light.

	values of from_nodes are lighting values.
*/
void VoxelManipulator::unspreadLight(enum LightBank bank,
		core::map<v3s16, u8> & from_nodes,
		core::map<v3s16, bool> & light_sources, INodeDefManager *nodemgr)
{
	if(from_nodes.size() == 0)
		return;
	
	core::map<v3s16, u8>::Iterator j;
	j = from_nodes.getIterator();

	for(; j.atEnd() == false; j++)
	{
		v3s16 pos = j.getNode()->getKey();
		
		//MapNode &n = m_data[m_area.index(pos)];
		
		u8 oldlight = j.getNode()->getValue();

		unspreadLight(bank, pos, oldlight, light_sources, nodemgr);
	}
}
#endif

#if 0
/*
	Goes recursively through the neighbours of the node.

	Alters only transparent nodes.

	If the lighting of the neighbour is lower than the lighting of
	the node was (before changing it to 0 at the step before), the
	lighting of the neighbour is set to 0 and then the same stuff
	repeats for the neighbour.

	The ending nodes of the routine are stored in light_sources.
	This is useful when a light is removed. In such case, this
	routine can be called for the light node and then again for
	light_sources to re-light the area without the removed light.

	values of from_nodes are lighting values.
*/
void VoxelManipulator::unspreadLight(enum LightBank bank,
		core::map<v3s16, u8> & from_nodes,
		core::map<v3s16, bool> & light_sources)
{
	v3s16 dirs[6] = {
		v3s16(0,0,1), // back
		v3s16(0,1,0), // top
		v3s16(1,0,0), // right
		v3s16(0,0,-1), // front
		v3s16(0,-1,0), // bottom
		v3s16(-1,0,0), // left
	};
	
	if(from_nodes.size() == 0)
		return;