Split up mapgen.cpp

src/mg_biome.cpp

@@ -0,0 +1,160 @@
+/*
+Minetest
+Copyright (C) 2010-2013 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 "mg_biome.h"
+#include "nodedef.h"
+#include "map.h" //for ManualMapVoxelManipulator
+#include "log.h"
+#include "util/numeric.h"
+#include "main.h"
+#include "util/mathconstants.h"
+#include "porting.h"
+
+NoiseParams nparams_biome_def_heat(50, 50, v3f(500.0, 500.0, 500.0), 5349, 3, 0.70);
+NoiseParams nparams_biome_def_humidity(50, 50, v3f(500.0, 500.0, 500.0), 842, 3, 0.55);
+
+
+BiomeDefManager::BiomeDefManager(NodeResolver *resolver)
+{
+	biome_registration_finished = false;
+	np_heat     = &nparams_biome_def_heat;
+	np_humidity = &nparams_biome_def_humidity;
+
+	// Create default biome to be used in case none exist
+	Biome *b = new Biome;
+	
+	b->id             = 0;
+	b->name           = "Default";
+	b->flags          = 0;
+	b->depth_top      = 0;
+	b->depth_filler   = 0;
+	b->height_min     = -MAP_GENERATION_LIMIT;
+	b->height_max     = MAP_GENERATION_LIMIT;
+	b->heat_point     = 0.0;
+	b->humidity_point = 0.0;
+
+	resolver->addNode("air",                 "", CONTENT_AIR, &b->c_top);
+	resolver->addNode("air",                 "", CONTENT_AIR, &b->c_filler);
+	resolver->addNode("mapgen_water_source", "", CONTENT_AIR, &b->c_water);
+	resolver->addNode("air",                 "", CONTENT_AIR, &b->c_dust);
+	resolver->addNode("mapgen_water_source", "", CONTENT_AIR, &b->c_dust_water);
+
+	biomes.push_back(b);
+}
+
+
+BiomeDefManager::~BiomeDefManager()
+{
+	//if (biomecache)
+	//	delete[] biomecache;
+	
+	for (size_t i = 0; i != biomes.size(); i++)
+		delete biomes[i];
+}
+
+
+Biome *BiomeDefManager::createBiome(BiomeTerrainType btt)
+{
+	/*switch (btt) {
+		case BIOME_TERRAIN_NORMAL:
+			return new Biome;
+		case BIOME_TERRAIN_LIQUID:
+			return new BiomeLiquid;
+		case BIOME_TERRAIN_NETHER:
+			return new BiomeHell;
+		case BIOME_TERRAIN_AETHER:
+			return new BiomeSky;
+		case BIOME_TERRAIN_FLAT:
+			return new BiomeSuperflat;
+	}
+	return NULL;*/
+	return new Biome;
+}
+
+
+// just a PoC, obviously needs optimization later on (precalculate this)
+void BiomeDefManager::calcBiomes(BiomeNoiseInput *input, u8 *biomeid_map)
+{
+	int i = 0;
+	for (int y = 0; y != input->mapsize.Y; y++) {
+		for (int x = 0; x != input->mapsize.X; x++, i++) {
+			float heat     = (input->heat_map[i] + 1) * 50;
+			float humidity = (input->humidity_map[i] + 1) * 50;
+			biomeid_map[i] = getBiome(heat, humidity, input->height_map[i])->id;
+		}
+	}
+}
+
+
+bool BiomeDefManager::addBiome(Biome *b)
+{
+	if (biome_registration_finished) {
+		errorstream << "BiomeDefManager: biome registration already "
+			"finished, dropping " << b->name << std::endl;
+		return false;
+	}
+	
+	size_t nbiomes = biomes.size();
+	if (nbiomes >= 0xFF) {
+		errorstream << "BiomeDefManager: too many biomes, dropping "
+			<< b->name << std::endl;
+		return false;
+	}
+
+	b->id = (u8)nbiomes;
+	biomes.push_back(b);
+	verbosestream << "BiomeDefManager: added biome " << b->name << std::endl;
+
+	return true;
+}
+
+
+Biome *BiomeDefManager::getBiome(float heat, float humidity, s16 y)
+{
+	Biome *b, *biome_closest = NULL;
+	float dist_min = FLT_MAX;
+
+	for (size_t i = 1; i < biomes.size(); i++) {
+		b = biomes[i];
+		if (y > b->height_max || y < b->height_min)
+			continue;
+
+		float d_heat     = heat     - b->heat_point;
+		float d_humidity = humidity - b->humidity_point;
+		float dist = (d_heat * d_heat) +
+					 (d_humidity * d_humidity);
+		if (dist < dist_min) {
+			dist_min = dist;
+			biome_closest = b;
+		}
+	}
+	
+	return biome_closest ? biome_closest : biomes[0];
+}
+
+
+u8 BiomeDefManager::getBiomeIdByName(const char *name)
+{
+	for (size_t i = 0; i != biomes.size(); i++) {
+		if (!strcasecmp(name, biomes[i]->name.c_str()))
+			return i;
+	}
+	
+	return 0;
+}