--- /dev/null
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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 <cmath>
+#include "mapgen_math.h"
+#include "voxel.h"
+#include "mapblock.h"
+#include "mapnode.h"
+#include "map.h"
+#include "nodedef.h"
+#include "voxelalgorithms.h"
+#include "profiler.h"
+#include "settings.h" // For g_settings
+#include "main.h" // For g_profiler
+#include "emerge.h"
+#include "biome.h"
+
+// can use ported lib from http://mandelbulber.googlecode.com/svn/trunk/src
+//#include "mandelbulber/fractal.h"
+//#include "mandelbulber/fractal.cpp"
+
+double mandelbox(double x, double y, double z, double d, int nn = 10) {
+ int s = 7;
+ x *= s;
+ y *= s;
+ z *= s;
+ d *= s;
+
+ double posX = x;
+ double posY = y;
+ double posZ = z;
+
+ double dr = 1.0;
+ double r = 0.0;
+
+ double scale = 2;
+
+ double minRadius2 = 0.25;
+ double fixedRadius2 = 1;
+
+ for (int n = 0; n < nn; n++) {
+ // Reflect
+ if (x > 1.0)
+ x = 2.0 - x;
+ else if (x < -1.0)
+ x = -2.0 - x;
+ if (y > 1.0)
+ y = 2.0 - y;
+ else if (y < -1.0)
+ y = -2.0 - y;
+ if (z > 1.0)
+ z = 2.0 - z;
+ else if (z < -1.0)
+ z = -2.0 - z;
+
+ // Sphere Inversion
+ double r2 = x * x + y * y + z * z;
+
+ if (r2 < minRadius2) {
+ x = x * fixedRadius2 / minRadius2;
+ y = y * fixedRadius2 / minRadius2;
+ z = z * fixedRadius2 / minRadius2;
+ dr = dr * fixedRadius2 / minRadius2;
+ } else if (r2 < fixedRadius2) {
+ x = x * fixedRadius2 / r2;
+ y = y * fixedRadius2 / r2;
+ z = z * fixedRadius2 / r2;
+ fixedRadius2 *= fixedRadius2 / r2;
+ }
+
+ x = x * scale + posX;
+ y = y * scale + posY;
+ z = z * scale + posZ;
+ dr *= scale;
+ }
+ r = sqrt(x * x + y * y + z * z);
+ return ((r / fabs(dr)) < d);
+
+}
+
+double mengersponge(double x, double y, double z, double d, int MI = 10) {
+
+ double r = x * x + y * y + z * z;
+ double scale = 3;
+ int i = 0;
+
+
+ for (i = 0; i < MI && r < 9; i++) {
+
+
+ x = fabs(x);
+ y = fabs(y);
+ z = fabs(z);
+
+
+ if (x - y < 0) {
+ double x1 = y;
+ y = x;
+ x = x1;
+ }
+ if (x - z < 0) {
+ double x1 = z;
+ z = x;
+ x = x1;
+ }
+ if (y - z < 0) {
+ double y1 = z;
+ z = y;
+ y = y1;
+ }
+
+
+ x = scale * x - 1 * (scale - 1);
+ y = scale * y - 1 * (scale - 1);
+ z = scale * z;
+
+
+ if (z > 0.5 * 1 * (scale - 1))
+ z -= 1 * (scale - 1);
+
+
+ r = x * x + y * y + z * z;
+ }
+ return ((sqrt(r)) * pow(scale, (-i)) < d);
+}
+
+double sphere(double x, double y, double z, double d, int ITR = 1) {
+ return v3f(x, y, z).getLength() < d;
+}
+
+
+//////////////////////// Mapgen Singlenode parameter read/write
+
+bool MapgenMathParams::readParams(Settings *settings) {
+ //params = settings->getJson("mg_math");
+ // can be counfigured from here.
+ std::string value = "{}";
+ Json::Reader reader;
+ if (!reader.parse( value, params ) ) {
+ errorstream << "Failed to parse json conf var ='" << value << "' : " << reader.getFormattedErrorMessages();
+ }
+
+ if (params["generator"].empty()) params["generator"] = settings->get("mgmath_generator");
+
+ return true;
+}
+
+
+void MapgenMathParams::writeParams(Settings *settings) {
+ //settings->setJson("mg_math", params);
+ settings->set("mgmath_generator", params["generator"].asString());
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+MapgenMath::MapgenMath(int mapgenid, MapgenMathParams *params_, EmergeManager *emerge) : MapgenV7(mapgenid, params_, emerge) {
+ mg_params = params_;
+
+ Json::Value & params = mg_params->params;
+ invert = params["invert"].empty() ? 1 : params["invert"].asBool(); //params["invert"].empty()?1:params["invert"].asBool();
+ size = params["size"].empty() ? 0 : params["size"].asDouble(); // = max_r
+ scale = params["scale"].empty() ? 0 : params["scale"].asDouble(); //(double)1 / size;
+ if(!params["center"].empty()) center = v3f(params["center"]["x"].asFloat(), params["center"]["y"].asFloat(), params["center"]["z"].asFloat()); //v3f(5, -size - 5, 5);
+ iterations = params["iterations"].empty() ? 0 : params["iterations"].asInt(); //10;
+ distance = params["distance"].empty() ? 0 : params["distance"].asDouble(); // = 1/size;
+
+ func = &sphere;
+
+ if (params["generator"].empty()) params["generator"] = "mandelbox";
+ if (params["generator"].asString() == "mengersponge") {
+ if (!size) size = (MAP_GENERATION_LIMIT - 1000) / 2;
+ if (!iterations) iterations = 10;
+ if (!distance) distance = 0.0003;
+ //if (!scale) scale = (double)0.1 / size;
+ //if (!distance) distance = 0.01; //10/size;//sqrt3 * bd4;
+ //if (!scale) scale = 0.01; //10/size;//sqrt3 * bd4;
+ //center=v3f(-size/3,-size/3+(-2*-invert),2);
+ center = v3f(-size, -size, -size);
+ func = &mengersponge;
+ } else if (params["generator"].asString() == "mandelbox") {
+ /*
+ size = MAP_GENERATION_LIMIT - 1000;
+ //size = 1000;
+ distance = 0.01; //100/size; //0.01;
+ iterations = 10;
+ center = v3f(1, 1, 1); // *size/6;
+ */
+
+ //mandelbox
+ if (!size) size = 1000;
+ if (!distance) distance = 0.01;
+ if(params["invert"].empty()) invert = 0;
+ //center=v3f(2,-size/4,2);
+ //size = 10000;
+ //center=v3f(size/2,-size*0.9,size/2);
+ if(params["center"].empty())center = v3f(size * 0.3, -size * 0.6, size * 0.5);
+ func = &mandelbox;
+ } else if (params["generator"].asString() == "sphere") {
+ if(params["invert"].empty()) invert = 0;
+ if (!size) size = 100;
+ if (!distance) distance = size;
+ func = &sphere;
+ if (!scale) scale = 1;
+ //sphere
+ //size = 1000;scale = 1;center = v3f(2,-size-2,2);
+ }
+
+ if (!iterations) iterations = 10;
+ if (!size) size = 1000;
+ if (!scale) scale = (double)1 / size;
+ if (!distance) distance = scale;
+ if (params["center"].empty() && !center.getLength()) center = v3f(3, -size + (-5 - (-invert * 10)), 3);
+ //size ||= params["size"].empty()?1000:params["size"].asDouble(); // = max_r
+
+}
+
+
+MapgenMath::~MapgenMath() {
+}
+
+//////////////////////// Map generator
+
+void MapgenMath::generateTerrain() {
+
+ MapNode n_air(CONTENT_AIR), n_water_source(c_water_source, LIGHT_SUN);
+ MapNode n_stone(c_stone, LIGHT_SUN);
+ u32 index = 0;
+ v3s16 em = vm->m_area.getExtent();
+
+#if 1
+
+ /* debug
+ v3f vec0 = (v3f(node_min.X, node_min.Y, node_min.Z) - center) * scale ;
+ errorstream << " X=" << node_min.X << " Y=" << node_min.Y << " Z=" << node_min.Z
+ //<< " N="<< mengersponge(vec0.X, vec0.Y, vec0.Z, distance, iterations)
+ << " N=" << (*func)(vec0.X, vec0.Y, vec0.Z, distance, iterations)
+ << " Sc=" << scale << " gen=" << params["generator"].asString() << " J=" << Json::FastWriter().write(params) << std::endl;
+ */
+ for (s16 z = node_min.Z; z <= node_max.Z; z++) {
+ for (s16 x = node_min.X; x <= node_max.X; x++, index++) {
+ Biome *biome = bmgr->biomes[biomemap[index]];
+ u32 i = vm->m_area.index(x, node_min.Y, z);
+ for (s16 y = node_min.Y; y <= node_max.Y; y++) {
+ v3f vec = (v3f(x, y, z) - center) * scale ;
+ double d = (*func)(vec.X, vec.Y, vec.Z, distance, iterations);
+ if ((!invert && d > 0) || (invert && d == 0) ) {
+ if (vm->m_data[i].getContent() == CONTENT_IGNORE)
+ vm->m_data[i] = (y > water_level + biome->filler_height) ?
+ MapNode(biome->c_filler) : n_stone;
+ } else if (y <= water_level) {
+ vm->m_data[i] = n_water_source;
+ } else {
+ vm->m_data[i] = n_air;
+ }
+ vm->m_area.add_y(em, i, 1);
+ }
+ }
+ }
+#endif
+
+
+#if 0
+// mandelbulber, unfinished but works
+ sFractal par;
+ par.doubles.N = 10;
+
+ par.doubles.power = 9.0;
+ par.doubles.foldingSphericalFixed = 1.0;
+ par.doubles.foldingSphericalMin = 0.5;
+ //no par.formula = smoothMandelbox; par.doubles.N = 40; invert = 0;//no
+ par.mandelbox.doubles.sharpness = 3.0;
+ par.mandelbox.doubles.scale = 1;
+ par.mandelbox.doubles.sharpness = 2;
+ par.mandelbox.doubles.foldingLimit = 1.0;
+ par.mandelbox.doubles.foldingValue = 2;
+
+//ok par.formula = mandelboxVaryScale4D; par.doubles.N = 50; scale = 5; invert = 1; //ok
+ par.mandelbox.doubles.vary4D.scaleVary = 0.1;
+ par.mandelbox.doubles.vary4D.fold = 1;
+ par.mandelbox.doubles.vary4D.rPower = 1;
+ par.mandelbox.doubles.vary4D.minR = 0.5;
+ par.mandelbox.doubles.vary4D.wadd = 0;
+ par.doubles.constantFactor = 1.0;
+
+ par.formula = menger_sponge; par.doubles.N = 15; invert = 0; size = 30000; center = v3f(-size / 2, -size + (-2 * -invert), 2); scale = (double)1 / size; //ok
+
+ //double tresh = 1.5;
+ //par.formula = mandelbulb2; par.doubles.N = 10; scale = (double)1/size; invert=1; center = v3f(5,-size-5,0); //ok
+ //par.formula = hypercomplex; par.doubles.N = 20; scale = 0.0001; invert=1; center = v3f(0,-10001,0); //(double)50 / max_r;
+
+ //no par.formula = trig_DE; par.doubles.N = 5; scale = (double)10; invert=1;
+
+ //no par.formula = trig_optim; scale = (double)10; par.doubles.N = 4;
+
+ //par.formula = mandelbulb2; scale = (double)1/10000; par.doubles.N = 10; invert = 1; center = v3f(1,-4201,1); //ok
+ // no par.formula = tglad;
+
+ //par.formula = xenodreambuie; par.juliaMode = 1; par.doubles.julia.x = -1; par.doubles.power = 2.0; center=v3f(-size/2,-size/2-5,5); //ok
+
+ par.mandelbox.doubles.vary4D.scaleVary = 0.1;
+ par.mandelbox.doubles.vary4D.fold = 1;
+ par.mandelbox.doubles.vary4D.minR = 0.5;
+ par.mandelbox.doubles.vary4D.rPower = 1;
+ par.mandelbox.doubles.vary4D.wadd = 0;
+ //no par.formula = mandelboxVaryScale4D;
+ par.doubles.cadd = -1.3;
+ //par.formula = aexion; // ok but center
+ //par.formula = benesi; par.doubles.N = 10; center = v3f(0,0,0); invert = 0; //ok
+
+ // par.formula = bristorbrot; //ok
+
+ v3f vec0(node_min.X, node_min.Y, node_min.Z);
+ vec0 = (vec0 - center) * scale ;
+ errorstream << " X=" << node_min.X << " Y=" << node_min.Y << " Z=" << node_min.Z
+ << " N=" << Compute<normal>(CVector3(vec0.X, vec0.Y, vec0.Z), par)
+ //<<" F="<< Compute<fake_AO>(CVector3(node_min.X,node_min.Y,node_min.Z), par)
+ //<<" L="<<node_min.getLength()<< " -="<<node_min.getLength() - Compute<normal>(CVector3(node_min.X,node_min.Y,node_min.Z), par)
+ << " Sc=" << scale
+ << std::endl;
+
+ for (s16 z = node_min.Z; z <= node_max.Z; z++)
+ for (s16 y = node_min.Y; y <= node_max.Y; y++) {
+ u32 i = vm->m_area.index(node_min.X, y, z);
+ for (s16 x = node_min.X; x <= node_max.X; x++) {
+ v3f vec(x, y, z);
+ vec = (vec - center) * scale ;
+ //double d = Compute<fake_AO>(CVector3(x,y,z), par);
+ double d = Compute<normal>(CVector3(vec.X, vec.Y, vec.Z), par);
+ //if (d>0)
+ // errorstream << " d=" << d <<" v="<< vec.getLength()<< " -="<< vec.getLength() - d <<" yad="
+ //<< Compute<normal>(CVector3(x,y,z), par)
+ //<< std::endl;
+ if ((!invert && d > 0) || (invert && d == 0)/*&& vec.getLength() - d > tresh*/ ) {
+ if (vm->m_data[i].getContent() == CONTENT_IGNORE)
+ vm->m_data[i] = n_stone;
+ } else {
+ vm->m_data[i] = n_air;
+ }
+ i++;
+ }
+ }
+
+
+#endif
+
+}
+
+int MapgenMath::getGroundLevelAtPoint(v2s16 p) {
+ return 0;
+}
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