mirror of https://github.com/minetest/minetest.git
258 lines
7.1 KiB
C++
258 lines
7.1 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "biome.h"
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#include "nodedef.h"
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#include "map.h" //for ManualMapVoxelManipulator
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#include "log.h"
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#include "util/numeric.h"
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#include "main.h"
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#include "util/mathconstants.h"
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NoiseParams nparams_biome_def_heat =
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{50, 50, v3f(500.0, 500.0, 500.0), 5349, 3, 0.70};
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NoiseParams nparams_biome_def_humidity =
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{50, 50, v3f(500.0, 500.0, 500.0), 842, 3, 0.55};
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BiomeDefManager::BiomeDefManager() {
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biome_registration_finished = false;
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np_heat = &nparams_biome_def_heat;
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np_humidity = &nparams_biome_def_humidity;
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// Create default biome to be used in case none exist
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Biome *b = new Biome;
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b->id = 0;
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b->name = "Default";
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b->flags = 0;
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b->depth_top = 0;
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b->depth_filler = 0;
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b->nname_top = "air";
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b->nname_filler = "air";
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b->nname_water = "mapgen_water_source";
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b->nname_dust = "air";
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b->nname_dust_water = "mapgen_water_source";
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b->c_top = CONTENT_IGNORE;
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b->c_filler = CONTENT_IGNORE;
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b->c_water = CONTENT_IGNORE;
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b->c_dust = CONTENT_IGNORE;
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b->c_dust_water = CONTENT_IGNORE;
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b->height_min = -MAP_GENERATION_LIMIT;
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b->height_max = MAP_GENERATION_LIMIT;
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b->heat_point = 0.0;
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b->humidity_point = 0.0;
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biomes.push_back(b);
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}
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BiomeDefManager::~BiomeDefManager() {
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//if (biomecache)
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// delete[] biomecache;
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for (size_t i = 0; i != biomes.size(); i++)
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delete biomes[i];
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}
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Biome *BiomeDefManager::createBiome(BiomeTerrainType btt) {
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/*switch (btt) {
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case BIOME_TERRAIN_NORMAL:
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return new Biome;
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case BIOME_TERRAIN_LIQUID:
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return new BiomeLiquid;
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case BIOME_TERRAIN_NETHER:
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return new BiomeHell;
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case BIOME_TERRAIN_AETHER:
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return new BiomeSky;
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case BIOME_TERRAIN_FLAT:
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return new BiomeSuperflat;
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}
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return NULL;*/
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return new Biome;
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}
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// just a PoC, obviously needs optimization later on (precalculate this)
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void BiomeDefManager::calcBiomes(BiomeNoiseInput *input, u8 *biomeid_map) {
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int i = 0;
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for (int y = 0; y != input->mapsize.Y; y++) {
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for (int x = 0; x != input->mapsize.X; x++, i++) {
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float heat = (input->heat_map[i] + 1) * 50;
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float humidity = (input->humidity_map[i] + 1) * 50;
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biomeid_map[i] = getBiome(heat, humidity, input->height_map[i])->id;
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}
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}
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}
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void BiomeDefManager::resolveNodeNames(INodeDefManager *ndef) {
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Biome *b;
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biome_registration_finished = true;
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for (size_t i = 0; i < biomes.size(); i++) {
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b = biomes[i];
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b->c_top = ndef->getId(b->nname_top);
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if (b->c_top == CONTENT_IGNORE) {
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errorstream << "BiomeDefManager::resolveNodeNames: node '"
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<< b->nname_top << "' not defined" << std::endl;
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b->c_top = CONTENT_AIR;
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b->depth_top = 0;
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}
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b->c_filler = ndef->getId(b->nname_filler);
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if (b->c_filler == CONTENT_IGNORE) {
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errorstream << "BiomeDefManager::resolveNodeNames: node '"
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<< b->nname_filler << "' not defined" << std::endl;
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b->c_filler = CONTENT_AIR;
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b->depth_filler = 0;
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}
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b->c_water = ndef->getId(b->nname_water);
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if (b->c_water == CONTENT_IGNORE) {
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errorstream << "BiomeDefManager::resolveNodeNames: node '"
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<< b->nname_water << "' not defined" << std::endl;
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b->c_water = CONTENT_AIR;
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}
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b->c_dust = ndef->getId(b->nname_dust);
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if (b->c_dust == CONTENT_IGNORE) {
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errorstream << "BiomeDefManager::resolveNodeNames: node '"
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<< b->nname_dust << "' not defined" << std::endl;
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}
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b->c_dust_water = ndef->getId(b->nname_dust_water);
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if (b->c_dust_water == CONTENT_IGNORE) {
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errorstream << "BiomeDefManager::resolveNodeNames: node '"
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<< b->nname_dust_water << "' not defined" << std::endl;
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}
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}
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}
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void BiomeDefManager::addBiome(Biome *b) {
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if (biome_registration_finished) {
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errorstream << "BIomeDefManager: biome registration already finished, dropping " << b->name <<std::endl;
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delete b;
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return;
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}
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size_t nbiomes = biomes.size();
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if (nbiomes >= 0xFF) {
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errorstream << "BiomeDefManager: too many biomes, dropping " << b->name << std::endl;
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delete b;
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return;
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}
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b->id = (u8)nbiomes;
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biomes.push_back(b);
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verbosestream << "BiomeDefManager: added biome " << b->name << std::endl;
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}
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Biome *BiomeDefManager::getBiome(float heat, float humidity, s16 y) {
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Biome *b, *biome_closest = NULL;
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float dist_min = FLT_MAX;
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for (size_t i = 1; i < biomes.size(); i++) {
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b = biomes[i];
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if (y > b->height_max || y < b->height_min)
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continue;
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float d_heat = heat - b->heat_point;
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float d_humidity = humidity - b->humidity_point;
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float dist = (d_heat * d_heat) +
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(d_humidity * d_humidity);
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if (dist < dist_min) {
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dist_min = dist;
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biome_closest = b;
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}
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}
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return biome_closest ? biome_closest : biomes[0];
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}
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u8 BiomeDefManager::getBiomeIdByName(const char *name) {
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for (size_t i = 0; i != biomes.size(); i++) {
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if (!strcasecmp(name, biomes[i]->name.c_str()))
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return i;
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}
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return 0;
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}
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///////////////////////////// Weather
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s16 BiomeDefManager::calcBlockHeat(v3s16 p, u64 seed, float timeofday, float totaltime) {
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//variant 1: full random
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//f32 heat = NoisePerlin3D(np_heat, p.X, env->getGameTime()/100, p.Z, seed);
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//variant 2: season change based on default heat map
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const f32 offset = 20; // = np_heat->offset
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const f32 scale = 20; // = np_heat->scale
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const f32 range = 20;
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f32 heat = NoisePerlin2D(np_heat, p.X, p.Z, seed); // 0..50..100
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heat -= np_heat->offset; // -50..0..+50
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// normalizing - todo REMOVE after fixed NoiseParams nparams_biome_def_heat = {50, 50, -> 20, 50,
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if (np_heat->scale)
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heat /= np_heat->scale / scale; // -20..0..+20
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f32 seasonv = totaltime;
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seasonv /= 86400 * g_settings->getS16("year_days"); // season change speed
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seasonv += (f32)p.X / 3000; // you can walk to area with other season
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seasonv = sin(seasonv * M_PI);
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heat += (range * (heat < 0 ? 2 : 0.5)) * seasonv; // -60..0..30
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heat += offset; // -40..0..50
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heat += p.Y / -333; // upper=colder, lower=hotter, 3c per 1000
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// daily change, hotter at sun +4, colder at night -4
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heat += 8 * (sin(cycle_shift(timeofday, -0.25) * M_PI) - 0.5); //-44..20..54
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return heat;
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}
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s16 BiomeDefManager::calcBlockHumidity(v3s16 p, u64 seed, float timeofday, float totaltime) {
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f32 humidity = NoisePerlin2D(np_humidity, p.X, p.Z, seed);
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f32 seasonv = totaltime;
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seasonv /= 86400 * 2; // bad weather change speed (2 days)
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seasonv += (f32)p.Z / 300;
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humidity += 30 * sin(seasonv * M_PI);
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humidity += -12 * (sin(cycle_shift(timeofday, -0.1) * M_PI) - 0.5);
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humidity = rangelim(humidity, 0, 100);
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return humidity;
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}
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