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authorywang <yw05@forksworld.de>2021-01-05 15:10:58 +0100
committerywang <yw05@forksworld.de>2021-01-05 15:10:58 +0100
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/*
Minetest
Copyright (C) 2015-2017 paramat
Copyright (C) 2015-2016 kwolekr, Ryan Kwolek <kwolekr@minetest.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 "mapgen.h"
#include "voxel.h"
#include "noise.h"
#include "mapblock.h"
#include "mapnode.h"
#include "map.h"
#include "content_sao.h"
#include "nodedef.h"
#include "voxelalgorithms.h"
//#include "profiler.h" // For TimeTaker
#include "settings.h" // For g_settings
#include "emerge.h"
#include "dungeongen.h"
#include "cavegen.h"
#include "mg_biome.h"
#include "mg_ore.h"
#include "mg_decoration.h"
#include "mapgen_fractal.h"


FlagDesc flagdesc_mapgen_fractal[] = {
	{NULL,    0}
};

///////////////////////////////////////////////////////////////////////////////////////


MapgenFractal::MapgenFractal(int mapgenid, MapgenFractalParams *params, EmergeManager *emerge)
	: MapgenBasic(mapgenid, params, emerge)
{
	this->spflags    = params->spflags;
	this->cave_width = params->cave_width;
	this->fractal    = params->fractal;
	this->iterations = params->iterations;
	this->scale      = params->scale;
	this->offset     = params->offset;
	this->slice_w    = params->slice_w;
	this->julia_x    = params->julia_x;
	this->julia_y    = params->julia_y;
	this->julia_z    = params->julia_z;
	this->julia_w    = params->julia_w;

	//// 2D terrain noise
	noise_seabed       = new Noise(&params->np_seabed, seed, csize.X, csize.Z);
	noise_filler_depth = new Noise(&params->np_filler_depth, seed, csize.X, csize.Z);

	MapgenBasic::np_cave1 = params->np_cave1;
	MapgenBasic::np_cave2 = params->np_cave2;

	this->formula = fractal / 2 + fractal % 2;
	this->julia   = fractal % 2 == 0;
}


MapgenFractal::~MapgenFractal()
{
	delete noise_seabed;
	delete noise_filler_depth;
}


MapgenFractalParams::MapgenFractalParams()
{
	spflags    = 0;
	cave_width = 0.09;
	fractal    = 1;
	iterations = 11;
	scale      = v3f(4096.0, 1024.0, 4096.0);
	offset     = v3f(1.79, 0.0, 0.0);
	slice_w    = 0.0;
	julia_x    = 0.33;
	julia_y    = 0.33;
	julia_z    = 0.33;
	julia_w    = 0.33;

	np_seabed       = NoiseParams(-14, 9,   v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
	np_filler_depth = NoiseParams(0,   1.2, v3f(150, 150, 150), 261,   3, 0.7, 2.0);
	np_cave1        = NoiseParams(0,   12,  v3f(61,  61,  61),  52534, 3, 0.5, 2.0);
	np_cave2        = NoiseParams(0,   12,  v3f(67,  67,  67),  10325, 3, 0.5, 2.0);
}


void MapgenFractalParams::readParams(const Settings *settings)
{
	settings->getFlagStrNoEx("mgfractal_spflags",  spflags, flagdesc_mapgen_fractal);
	settings->getFloatNoEx("mgfractal_cave_width", cave_width);
	settings->getU16NoEx("mgfractal_fractal",      fractal);
	settings->getU16NoEx("mgfractal_iterations",   iterations);
	settings->getV3FNoEx("mgfractal_scale",        scale);
	settings->getV3FNoEx("mgfractal_offset",       offset);
	settings->getFloatNoEx("mgfractal_slice_w",    slice_w);
	settings->getFloatNoEx("mgfractal_julia_x",    julia_x);
	settings->getFloatNoEx("mgfractal_julia_y",    julia_y);
	settings->getFloatNoEx("mgfractal_julia_z",    julia_z);
	settings->getFloatNoEx("mgfractal_julia_w",    julia_w);

	settings->getNoiseParams("mgfractal_np_seabed",       np_seabed);
	settings->getNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
	settings->getNoiseParams("mgfractal_np_cave1",        np_cave1);
	settings->getNoiseParams("mgfractal_np_cave2",        np_cave2);
}


void MapgenFractalParams::writeParams(Settings *settings) const
{
	settings->setFlagStr("mgfractal_spflags",  spflags, flagdesc_mapgen_fractal, U32_MAX);
	settings->setFloat("mgfractal_cave_width", cave_width);
	settings->setU16("mgfractal_fractal",      fractal);
	settings->setU16("mgfractal_iterations",   iterations);
	settings->setV3F("mgfractal_scale",        scale);
	settings->setV3F("mgfractal_offset",       offset);
	settings->setFloat("mgfractal_slice_w",    slice_w);
	settings->setFloat("mgfractal_julia_x",    julia_x);
	settings->setFloat("mgfractal_julia_y",    julia_y);
	settings->setFloat("mgfractal_julia_z",    julia_z);
	settings->setFloat("mgfractal_julia_w",    julia_w);

	settings->setNoiseParams("mgfractal_np_seabed",       np_seabed);
	settings->setNoiseParams("mgfractal_np_filler_depth", np_filler_depth);
	settings->setNoiseParams("mgfractal_np_cave1",        np_cave1);
	settings->setNoiseParams("mgfractal_np_cave2",        np_cave2);
}


/////////////////////////////////////////////////////////////////


int MapgenFractal::getSpawnLevelAtPoint(v2s16 p)
{
	bool solid_below = false;  // Dry solid node is present below to spawn on
	u8 air_count = 0;  // Consecutive air nodes above the dry solid node
	s16 seabed_level = NoisePerlin2D(&noise_seabed->np, p.X, p.Y, seed);
	// Seabed can rise above water_level or might be raised to create dry land
	s16 search_start = MYMAX(seabed_level, water_level + 1);
	if (seabed_level > water_level)
		solid_below = true;

	for (s16 y = search_start; y <= search_start + 128; y++) {
		if (getFractalAtPoint(p.X, y, p.Y)) {  // Fractal node
			solid_below = true;
			air_count = 0;
		} else if (solid_below) {  // Air above solid node
			air_count++;
			if (air_count == 2)
				return y - 2;
		}
	}

	return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
}


void MapgenFractal::makeChunk(BlockMakeData *data)
{
	// Pre-conditions