minetest/src/mapgen_v5.cpp

/*
Minetest
Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
Copyright (C) 2010-2015 paramat, Matt Gregory

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 "treegen.h"
#include "mg_biome.h"
#include "mg_ore.h"
#include "mg_decoration.h"
#include "mapgen_v5.h"


FlagDesc flagdesc_mapgen_v5[] = {
	{NULL,         0}
};


MapgenV5::MapgenV5(int mapgenid, MapgenParams *params, EmergeManager *emerge)
	: MapgenBasic(mapgenid, params, emerge)
{
	this->m_emerge = emerge;
	this->bmgr     = emerge->biomemgr;

	// amount of elements to skip for the next index
	// for noise/height/biome maps (not vmanip)
	this->ystride = csize.X;
	// 1-down overgeneration
	this->zstride_1d = csize.X * (csize.Y + 1);

	this->heightmap = new s16[csize.X * csize.Z];

	MapgenV5Params *sp = (MapgenV5Params *)params->sparams;

	this->spflags    = sp->spflags;
	this->cave_width = sp->cave_width;

	// Terrain noise
	noise_filler_depth = new Noise(&sp->np_filler_depth, seed, csize.X, csize.Z);
	noise_factor       = new Noise(&sp->np_factor,       seed, csize.X, csize.Z);
	noise_height       = new Noise(&sp->np_height,       seed, csize.X, csize.Z);

	// 3D terrain noise
	// 1-up 1-down overgeneration
	noise_ground = new Noise(&sp->np_ground, seed, csize.X, csize.Y + 2, csize.Z);
	// 1-down overgeneraion
	noise_cave1  = new Noise(&sp->np_cave1,  seed, csize.X, csize.Y + 1, csize.Z);
	noise_cave2  = new Noise(&sp->np_cave2,  seed, csize.X, csize.Y + 1, csize.Z);

	//// Initialize biome generator
	biomegen = emerge->biomemgr->createBiomeGen(
		BIOMEGEN_ORIGINAL, params->bparams, csize);
	biomemap = biomegen->biomemap;

	//// Resolve nodes to be used
	c_stone                = ndef->getId("mapgen_stone");
	c_water_source         = ndef->getId("mapgen_water_source");
	c_lava_source          = ndef->getId("mapgen_lava_source");
	c_desert_stone         = ndef->getId("mapgen_desert_stone");
	c_ice                  = ndef->getId("mapgen_ice");
	c_sandstone            = ndef->getId("mapgen_sandstone");

	c_cobble               = ndef->getId("mapgen_cobble");
	c_stair_cobble         = ndef->getId("mapgen_stair_cobble");
	c_mossycobble          = ndef->getId("mapgen_mossycobble");
	c_sandstonebrick       = ndef->getId("mapgen_sandstonebrick");
	c_stair_sandstonebrick = ndef->getId("mapgen_stair_sandstonebrick");

	if (c_ice == CONTENT_IGNORE)
		c_ice = CONTENT_AIR;
	if (c_mossycobble == CONTENT_IGNORE)
		c_mossycobble = c_cobble;
	if (c_stair_cobble == CONTENT_IGNORE)
		c_stair_cobble = c_cobble;
	if (c_sandstonebrick == CONTENT_IGNORE)
		c_sandstonebrick = c_sandstone;
	if (c_stair_sandstonebrick == CONTENT_IGNORE)
		c_stair_sandstonebrick = c_sandstone;
}


MapgenV5::~MapgenV5()
{
	delete noise_filler_depth;
	delete noise_factor;
	delete noise_height;
	delete noise_cave1;
	delete noise_cave2;
	delete noise_ground;

	delete biomegen;

	delete[] heightmap;
}


MapgenV5Params::MapgenV5Params()
{
	spflags    = 0;
	cave_width = 0.125;

	np_filler_depth = NoiseParams(0, 1,  v3f(150, 150, 150), 261,    4, 0.7,  2.0);
	np_factor       = NoiseParams(0, 1,  v3f(250, 250, 250), 920381, 3, 0.45, 2.0);
	np_height       = NoiseParams(0, 10, v3f(250, 250, 250), 84174,  4, 0.5,  2.0);
	np_cave1        = NoiseParams(0, 12, v3f(50,  50,  50),  52534,  4, 0.5,  2.0);
	np_cave2        = NoiseParams(0, 12, v3f(50,  50,  50),  10325,  4, 0.5,  2.0);
	np_ground       = NoiseParams(0, 40, v3f(80,  80,  80),  983240, 4, 0.55, 2.0, NOISE_FLAG_EASED);
}


//#define CAVE_NOISE_SCALE 12.0
//#define CAVE_NOISE_THRESHOLD (1.5/CAVE_NOISE_SCALE) = 0.125


void MapgenV5Params::readParams(const Settings *settings)
{
	settings->getFlagStrNoEx("mgv5_spflags",  spflags, flagdesc_mapgen_v5);
	settings->getFloatNoEx("mgv5_cave_width", cave_width);

	settings->getNoiseParams("mgv5_np_filler_depth", np_filler_depth);
	settings->getNoiseParams("mgv5_np_factor",       np_factor);
	settings->getNoiseParams("mgv5_np_height",       np_height);
	settings->getNoiseParams("mgv5_np_cave1",        np_cave1);
	settings->getNoiseParams("mgv5_np_cave2",        np_cave2);
	settings->getNoiseParams("mgv5_np_ground",       np_ground);
}


void MapgenV5Params::writeParams(Settings *settings) const
{
	settings->setFlagStr("mgv5_spflags",  spflags, flagdesc_mapgen_v5, U32_MAX);
	settings->setFloat("mgv5_cave_width", cave_width);

	settings->setNoiseParams("mgv5_np_filler_depth", np_filler_depth);
	settings->setNoiseParams("mgv5_np_factor",       np_factor);
	settings->setNoiseParams("mgv5_np_height",       np_height);
	settings->setNoiseParams("mgv5_np_cave1",        np_cave1);
	settings->setNoiseParams("mgv5_np_cave2",        np_cave2);
	settings->setNoiseParams("mgv5_np_ground",       np_ground);
}


int MapgenV5::getSpawnLevelAtPoint(v2s16 p)
{
	//TimeTaker t("getGroundLevelAtPoint", NULL, PRECISION_MICRO);

	float f = 0.55 + NoisePerlin2D(&noise_factor->np, p.X, p.Y, seed);
	if (f < 0.01)
		f = 0.01;
	else if (f >= 1.0)
		f *= 1.6;
	float h = NoisePerlin2D(&noise_height->np, p.X, p.Y, seed);

	for (s16 y = 128; y >= -128; y--) {
		float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);

		if (n_ground * f > y - h) {  // If solid
			// If either top 2 nodes of search are solid this is inside a
			// mountain or floatland with possibly no space for the player to spawn.
			if (y >= 127) {
				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
			} else {  // Ground below at least 2 nodes of empty space
				if (y <= water_level || y > water_level + 16)
					return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
				else
					return y;
			}
		}
	}

	//printf("getGroundLevelAtPoint: %dus\n", t.stop());
	return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn position, no ground found
}


void MapgenV5::makeChunk(BlockMakeData *data)
{
	// Pre-conditions
	assert(data->vmanip);
	assert(data->nodedef);
	assert(data->blockpos_requested.X >= data->blockpos_min.X &&
		data->blockpos_requested.Y >= data->blockpos_min.Y &&
		data->blockpos_requested.Z >= data->blockpos_min.Z);
	assert(data->blockpos_requested.X <= data->blockpos_max.X &&
		data->blockpos_requested.Y <= data->blockpos_max.Y &&
		data->blockpos_requested.Z <= data->blockpos_max.Z);

	this->generating = true;
	this->vm   = data->vmanip;
	this->ndef = data->nodedef;
	//TimeTaker t("makeChunk");

	v3s16 blockpos_min = data->blockpos_min;
	v3s16 blockpos_max = data->blockpos_max;
	node_min = blockpos_min * MAP_BLOCKSIZE;
	node_max = (blockpos_max + v3s16(1, 1, 1)) * MAP_BLOCKSIZE - v3s16(1, 1, 1);
	full_node_min = (blockpos_min - 1) * MAP_BLOCKSIZE;
	full_node_max = (blockpos_max + 2) * MAP_BLOCKSIZE - v3s16(1, 1, 1);

	// Create a block-specific seed
	blockseed = getBlockSeed2(full_node_min, seed);

	// Make some noise
	calculateNoise();

	// Generate base terrain
	s16 stone_surface_max_y = generateBaseTerrain();

	// Create heightmap
	updateHeightmap(node_min, node_max);

	// Init biome generator, place biome-specific nodes, and build biomemap
	biomegen->calcBiomeNoise(node_min);
	biomegen->getBiomes(heightmap);
	MgStoneType stone_type = generateBiomes();

	// Generate caves
	if ((flags & MG_CAVES) && (stone_surface_max_y >= node_min.Y))
		generateCaves(stone_surface_max_y, MGV5_LARGE_CAVE_DEPTH);

	// Generate dungeons and desert temples
	if ((flags & MG_DUNGEONS) && (stone_surface_max_y >= node_min.Y)) {
		DungeonParams dp;

		dp.np_rarity  = nparams_dungeon_rarity;
		dp.np_density = nparams_dungeon_density;
		dp.np_wetness = nparams_dungeon_wetness;
		dp.c_water    = c_water_source;
		if (stone_type == STONE) {
			dp.c_cobble = c_cobble;
			dp.c_moss   = c_mossycobble;
			dp.c_stair  = c_stair_cobble;

			dp.diagonal_dirs = false;
			dp.mossratio     = 3.0;
			dp.holesize      = v3s16(1, 2, 1);
			dp.roomsize      = v3s16(0, 0, 0);
			dp.notifytype    = GENNOTIFY_DUNGEON;
		} else if (stone_type == DESERT_STONE) {
			dp.c_cobble = c_desert_stone;
			dp.c_moss   = c_desert_stone;
			dp.c_stair  = c_desert_stone;

			dp.diagonal_dirs = true;
			dp.mossratio     = 0.0;
			dp.holesize      = v3s16(2, 3, 2);
			dp.roomsize      = v3s16(2, 5, 2);
			dp.notifytype    = GENNOTIFY_TEMPLE;
		} else if (stone_type == SANDSTONE) {
			dp.c_cobble = c_sandstonebrick;
			dp.c_moss   = c_sandstonebrick;
			dp.c_stair  = c_sandstonebrick;

			dp.diagonal_dirs = false;
			dp.mossratio     = 0.0;
			dp.holesize      = v3s16(2, 2, 2);
			dp.roomsize      = v3s16(2, 0, 2);
			dp.notifytype    = GENNOTIFY_DUNGEON;
		}

		DungeonGen dgen(this, &dp);
		dgen.generate(blockseed, full_node_min, full_node_max);
	}

	// Generate the registered decorations
	if (flags & MG_DECORATIONS)
		m_emerge->decomgr->placeAllDecos(this, blockseed, node_min, node_max);

	// Generate the registered ores
	m_emerge->oremgr->placeAllOres(this, blockseed, node_min, node_max);

	// Sprinkle some dust on top after everything else was generated
	dustTopNodes();

	//printf("makeChunk: %dms\n", t.stop());

	// Add top and bottom side of water to transforming_liquid queue
	updateLiquid(&data->transforming_liquid, full_node_min, full_node_max);

	// Calculate lighting
	if (flags & MG_LIGHT) {
		calcLighting(node_min - v3s16(0, 1, 0), node_max + v3s16(0, 1, 0),
			full_node_min, full_node_max);
	}

	this->generating = false;
}


void MapgenV5::calculateNoise()
{
	//TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
	s16 x = node_min.X;
	s16 y = node_min.Y - 1;
	s16 z = node_min.Z;

	noise_factor->perlinMap2D(x, z);
	noise_height->perlinMap2D(x, z);
	noise_ground->perlinMap3D(x, y, z);

	// Cave noises are calculated in generateCaves()
	// only if solid terrain is present in mapchunk

	noise_filler_depth->perlinMap2D(x, z);

	//printf("calculateNoise: %dus\n", t.stop());
}


//bool is_cave(u32 index) {
//	double d1 = contour(noise_cave1->result[index]);
//	double d2 = contour(noise_cave2->result[index]);
//	return d1*d2 > CAVE_NOISE_THRESHOLD;
//}

//bool val_is_ground(v3s16 p, u32 index, u32 index2d) {
//	double f = 0.55 + noise_factor->result[index2d];
//	if(f < 0.01)
//		f = 0.01;
//	else if(f >= 1.0)
//		f *= 1.6;
//	double h = WATER_LEVEL + 10 * noise_height->result[index2d];
//	return (noise_ground->result[index] * f > (double)p.Y - h);
//}


int MapgenV5::generateBaseTerrain()
{
	u32 index = 0;
	u32 index2d = 0;
	int stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;

	for (s16 z=node_min.Z; z<=node_max.Z; z++) {
		for (s16 y=node_min.Y - 1; y<=node_max.Y + 1; y++) {
			u32 vi = vm->m_area.index(node_min.X, y, z);
			for (s16 x=node_min.X; x<=node_max.X; x++, vi++, index++, index2d++) {
				if (vm->m_data[vi].getContent() != CONTENT_IGNORE)
					continue;

				float f = 0.55 + noise_factor->result[index2d];
				if (f < 0.01)
					f = 0.01;
				else if (f >= 1.0)
					f *= 1.6;
				float h = noise_height->result[index2d];

				if (noise_ground->result[index] * f < y - h) {
					if (y <= water_level)
						vm->m_data[vi] = MapNode(c_water_source);
					else
						vm->m_data[vi] = MapNode(CONTENT_AIR);
				} else {
					vm->m_data[vi] = MapNode(c_stone);
					if (y > stone_surface_max_y)
						stone_surface_max_y = y;
				}
			}
			index2d -= ystride;
		}
		index2d += ystride;
	}

	return stone_surface_max_y;
}