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* | | try to make engine animation workorwell962016-10-19
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* | some smaller slopesorwell962016-10-06
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* | add japanese wagon and engineorwell962016-10-06
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* add acceleration calculationorwell962016-09-29
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* fix train entities moving with wrong speedorwell962016-09-29
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* add owner system to prevent random train destroyingorwell962016-09-29
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* destructed wagons in survival give only steel back, user confirmation addedorwell962016-09-28
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* adding ability for custom on_step/destroy functions in wagon definitionorwell962016-09-28
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* add 45 degrees vertical railsorwell962016-09-18
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* add more crafting recipes and a manualorwell962016-09-17
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* add some items to the not-blocking-trains grouporwell962016-09-15
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* wtf did this file in here?orwell962016-09-15
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* relicensing under CC-BY-NC-SA and updationg readme.orwell962016-09-15
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* various improvements on signals and bumpersorwell962016-09-13
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* make switches not switchable when train is on it, and do neccessary stuff on ↵orwell962016-09-13
| | | | switching
* add electric signal and rotate signals for better placementorwell962016-09-13
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* add mesecon support for switches and signalsorwell962016-09-13
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* adding a signal.orwell962016-09-12
| | | | it is controllable by mesecons and by right click. it does not influence trains
* adding mbb's new texturesorwell962016-09-12
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* Adding crafting recipesorwell962016-09-12
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* fix item drops on rails, and throw bumpers out of the trackplacer tables, ↵orwell962016-09-12
| | | | because it caused confusion
* add bumpersorwell962016-09-12
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* Fix two trackplacer issuesorwell962016-08-30
| | | | | 1. you can't place tracks on non-walkable nodes 2. in certain situations no rail was placed at all
* removed 2 very annoying debug messages that should not go with 1.0orwell962016-08-29
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* Updating readme, and branching to v1.0orwell962016-08-29
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* implement track placing algorithm betterorwell962016-08-29
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* correcting an error that caused a crashorwell962016-08-28
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* correct wrongly rotated texture for subwayorwell962016-08-28
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* Add a subway train (and fix spelling mistake resulting in collision not workingorwell962016-08-28
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* Add a platform node, make some nodes (esp. fences) not blocking trains, ↵orwell962016-08-28
| | | | implement benchmarking better and optimize some things
* Fixing inventory and inventory imagesorwell962016-08-28
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* Making everything visible in creative inventory, since the code that should ↵orwell962016-08-28
| | | | do that does not work.
* Re-implement collision in a less resource-intensive way that I should have ↵orwell962016-08-27
| | | | used on from the beginning (ad fix some logical mistakes)
* Creating new switches, and adding lbms to finally abandon old railsorwell962016-08-26
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* Tidy up the workspaceorwell962016-08-25
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* Fix shadow bug on some rail modelsorwell962016-08-23
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* finally fix train collisions (please work now)orwell962016-08-22
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* tidying up the tracks and trackworker/placer code and making rail ↵orwell962016-08-22
| | | | registration a lot more modular
* repairing the trackworkerorwell962016-08-21
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* add new-style vertical tracksorwell962016-08-21
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* fix error in real train index calculationorwell962016-08-21
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* removing unused debug itemsorwell962016-08-21
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* Extending to 30deg rails, creating and adding the modelsorwell962016-08-21
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* integrating the new rails (currently no verticals and switches) (fix mistake)orwell962016-07-04
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* integrating the new rails (currently no verticals and switches)orwell962016-07-04
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* adding some dummy textures (dtrack) for new anglesorwell962016-07-04
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* Screwing everything up in order to extend to 16 possible directions with 1/8 ↵orwell962016-07-04
| | | | precision
* delete a commentorwell962016-07-04
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* Hopefully fix collision finally (fix mistake)orwell962016-07-04
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* Hopefully fix collision finallyorwell962016-07-04
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/*
Minetest
Copyright (C) 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 "mapblock.h"

#include <sstream>
#include "map.h"
#include "light.h"
#include "nodedef.h"
#include "nodemetadata.h"
#include "gamedef.h"
#include "log.h"
#include "nameidmapping.h"
#include "content_mapnode.h" // For legacy name-id mapping
#include "content_nodemeta.h" // For legacy deserialization
#include "serialization.h"
#ifndef SERVER
#include "client/mapblock_mesh.h"
#endif
#include "porting.h"
#include "util/string.h"
#include "util/serialize.h"
#include "util/basic_macros.h"

static const char *modified_reason_strings[] = {
	"initial",
	"reallocate",
	"setIsUnderground",
	"setLightingExpired",
	"setGenerated",
	"setNode",
	"setNodeNoCheck",
	"setTimestamp",
	"NodeMetaRef::reportMetadataChange",
	"clearAllObjects",
	"Timestamp expired (step)",
	"addActiveObjectRaw",
	"removeRemovedObjects/remove",
	"removeRemovedObjects/deactivate",
	"Stored list cleared in activateObjects due to overflow",
	"deactivateFarObjects: Static data moved in",
	"deactivateFarObjects: Static data moved out",
	"deactivateFarObjects: Static data changed considerably",
	"finishBlockMake: expireDayNightDiff",
	"unknown",
};


/*
	MapBlock
*/

MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
		m_parent(parent),
		m_pos(pos),
		m_pos_relative(pos * MAP_BLOCKSIZE),
		m_gamedef(gamedef)
{
	if (!dummy)
		reallocate();
}

MapBlock::~MapBlock()
{
#ifndef SERVER
	{
		delete mesh;
		mesh = nullptr;
	}
#endif

	delete[] data;
}

bool MapBlock::isValidPositionParent(v3s16 p)
{
	if (isValidPosition(p)) {
		return true;
	}

	return m_parent->isValidPosition(getPosRelative() + p);
}

MapNode MapBlock::getNodeParent(v3s16 p, bool *is_valid_position)
{
	if (!isValidPosition(p))
		return m_parent->getNode(getPosRelative() + p, is_valid_position);

	if (!data) {
		if (is_valid_position)
			*is_valid_position = false;
		return {CONTENT_IGNORE};
	}
	if (is_valid_position)
		*is_valid_position = true;
	return data[p.Z * zstride + p.Y * ystride + p.X];
}

std::string MapBlock::getModifiedReasonString()
{
	std::string reason;

	const u32 ubound = MYMIN(sizeof(m_modified_reason) * CHAR_BIT,
		ARRLEN(modified_reason_strings));

	for (u32 i = 0; i != ubound; i++) {
		if ((m_modified_reason & (1 << i)) == 0)
			continue;

		reason += modified_reason_strings[i];
		reason += ", ";
	}

	if (reason.length() > 2)
		reason.resize(reason.length() - 2);

	return reason;
}


void MapBlock::copyTo(VoxelManipulator &dst)
{
	v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
	VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));

	// Copy from data to VoxelManipulator
	dst.copyFrom(data, data_area, v3s16(0,0,0),
			getPosRelative(), data_size);
}

void MapBlock::copyFrom(VoxelManipulator &dst)
{
	v3s16 data_size(MAP_BLOCKSIZE, MAP_BLOCKSIZE, MAP_BLOCKSIZE);
	VoxelArea data_area(v3s16(0,0,0), data_size - v3s16(1,1,1));

	// Copy from VoxelManipulator to data
	dst.copyTo(data, data_area, v3s16(0,0,0),
			getPosRelative(), data_size);