summaryrefslogtreecommitdiff
path: root/src/mapgen/mapgen_v5.cpp
blob: c5be727b97b1ba70d814e4097fcc81a9acfb7451 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
/*
Minetest
Copyright (C) 2014-2018 paramat
Copyright (C) 2014-2018 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_v5.h"


FlagDesc flagdesc_mapgen_v5[] = {
	{"caverns", MGV5_CAVERNS},
	{NULL,      0}
};


MapgenV5::MapgenV5(int mapgenid, MapgenV5Params *params, EmergeManager *emerge)
	: MapgenBasic(mapgenid, params, emerge)
{
	spflags          = params->spflags;
	cave_width       = params->cave_width;
	large_cave_depth = params->large_cave_depth;
	lava_depth       = params->lava_depth;
	cavern_limit     = params->cavern_limit;
	cavern_taper     = params->cavern_taper;
	cavern_threshold = params->cavern_threshold;
	dungeon_ymin     = params->dungeon_ymin;
	dungeon_ymax     = params->dungeon_ymax;

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

	// 3D terrain noise
	// 1-up 1-down overgeneration
	noise_ground = new Noise(&params->np_ground, seed, csize.X, csize.Y + 2, csize.Z);
	// 1 down overgeneration
	MapgenBasic::np_cave1  = params->np_cave1;
	MapgenBasic::np_cave2  = params->np_cave2;
	MapgenBasic::np_cavern = params->np_cavern;
}


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


MapgenV5Params::MapgenV5Params():
	np_filler_depth (0, 1,  v3f(150, 150, 150), 261,    4, 0.7,  2.0),
	np_factor       (0, 1,  v3f(250, 250, 250), 920381, 3, 0.45, 2.0),
	np_height       (0, 10, v3f(250, 250, 250), 84174,  4, 0.5,  2.0),
	np_ground       (0, 40, v3f(80,  80,  80),  983240, 4, 0.55, 2.0, NOISE_FLAG_EASED),
	np_cave1        (0, 12, v3f(61,  61,  61),  52534,  3, 0.5,  2.0),
	np_cave2        (0, 12, v3f(67,  67,  67),  10325,  3, 0.5,  2.0),
	np_cavern       (0, 1,  v3f(384, 128, 384), 723,    5, 0.63, 2.0)
{
}


void MapgenV5Params::readParams(const Settings *settings)
{
	settings->getFlagStrNoEx("mgv5_spflags",        spflags, flagdesc_mapgen_v5);
	settings->getFloatNoEx("mgv5_cave_width",       cave_width);
	settings->getS16NoEx("mgv5_large_cave_depth",   large_cave_depth);
	settings->getS16NoEx("mgv5_lava_depth",         lava_depth);
	settings->getS16NoEx("mgv5_cavern_limit",       cavern_limit);
	settings->getS16NoEx("mgv5_cavern_taper",       cavern_taper);
	settings->getFloatNoEx("mgv5_cavern_threshold", cavern_threshold);
	settings->getS16NoEx("mgv5_dungeon_ymin",       dungeon_ymin);
	settings->getS16NoEx("mgv5_dungeon_ymax",       dungeon_ymax);

	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_ground",       np_ground);
	settings->getNoiseParams("mgv5_np_cave1",        np_cave1);
	settings->getNoiseParams("mgv5_np_cave2",        np_cave2);
	settings->getNoiseParams("mgv5_np_cavern",       np_cavern);
}


void MapgenV5Params::writeParams(Settings *settings) const
{
	settings->setFlagStr("mgv5_spflags",        spflags, flagdesc_mapgen_v5, U32_MAX);
	settings->setFloat("mgv5_cave_width",       cave_width);
	settings->setS16("mgv5_large_cave_depth",   large_cave_depth);
	settings->setS16("mgv5_lava_depth",         lava_depth);
	settings->setS16("mgv5_cavern_limit",       cavern_limit);
	settings->setS16("mgv5_cavern_taper",       cavern_taper);
	settings->setFloat("mgv5_cavern_threshold", cavern_threshold);
	settings->setS16("mgv5_dungeon_ymin",       dungeon_ymin);
	settings->setS16("mgv5_dungeon_ymax",       dungeon_ymax);

	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_ground",       np_ground);
	settings->setNoiseParams("mgv5_np_cave1",        np_cave1);
	settings->setNoiseParams("mgv5_np_cave2",        np_cave2);
	settings->setNoiseParams("mgv5_np_cavern",       np_cavern);
}


int MapgenV5::getSpawnLevelAtPoint(v2s16 p)
{

	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);

	// noise_height 'offset' is the average level of terrain. At least 50% of
	// terrain will be below this.
	// Raising the maximum spawn level above 'water_level + 16' is necessary
	// for when noise_height 'offset' is set much higher than water_level.
	s16 max_spawn_y = MYMAX(noise_height->np.offset, water_level + 16);

	// Starting spawn search at max_spawn_y + 128 ensures 128 nodes of open
	// space above spawn position. Avoids spawning in possibly sealed voids.
	for (s16 y = max_spawn_y + 128; y >= water_level; y--) {
		float n_ground = NoisePerlin3D(&noise_ground->np, p.X, y, p.Y, seed);

		if (n_ground * f > y - h) {  // If solid
			if (y < water_level || y > max_spawn_y)
				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point

			// y + 2 because y is surface and due to biome 'dust' nodes.
			return y + 2;
		}
	}
	// Unsuitable spawn position, no ground found
	return MAX_MAP_GENERATION_LIMIT;
}


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);

	// 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
	if (flags & MG_BIOMES) {
		biomegen->calcBiomeNoise(node_min);
		generateBiomes();
	}

	// Generate tunnels, caverns and large randomwalk caves
	if (flags & MG_CAVES) {
		// Generate tunnels first as caverns confuse them
		generateCavesNoiseIntersection(stone_surface_max_y);

		// Generate caverns
		bool near_cavern = false;
		if (spflags & MGV5_CAVERNS)
			near_cavern = generateCavernsNoise(stone_surface_max_y);

		// Generate large randomwalk caves
		if (near_cavern)
			// Disable large randomwalk caves in this mapchunk by setting
			// 'large cave depth' to world base. Avoids excessive liquid in
			// large caverns and floating blobs of overgenerated liquid.
			generateCavesRandomWalk(stone_surface_max_y,
				-MAX_MAP_GENERATION_LIMIT);
		else
			generateCavesRandomWalk(stone_surface_max_y, large_cave_depth);
	}

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

	// Generate dungeons and desert temples
	if ((flags & MG_DUNGEONS) && full_node_min.Y >= dungeon_ymin &&
			full_node_max.Y <= dungeon_ymax)
		generateDungeons(stone_surface_max_y);

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

	// Sprinkle some dust on top after everything else was generated
	if (flags & MG_BIOMES)
		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;
}


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

	noise_factor->perlinMap2D(node_min.X, node_min.Z);
	noise_height->perlinMap2D(node_min.X, node_min.Z);
	noise_ground->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);

	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;
}