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Fractal mapgen: Add seabed and large pseudorandom caves
This commit is contained in:
paramat
parent
d152b55971
commit
706e7cebea
4 changed files with 371 additions and 50 deletions
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@ -1,7 +1,7 @@
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/*
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Minetest
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Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
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Additional development and fractal code by paramat
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Copyright (C) 2010-2015 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
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Copyright (C) 2010-2015 paramat, Matt Gregory
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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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@ -73,9 +73,12 @@ MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *
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this->offset_y = sp->offset_y;
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this->offset_z = sp->offset_z;
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//// 3d terrain noise
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noise_cave1 = new Noise(&sp->np_cave1, seed, csize.X, csize.Y + 2, csize.Z);
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noise_cave2 = new Noise(&sp->np_cave2, seed, csize.X, csize.Y + 2, csize.Z);
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//// 2D terrain noise
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noise_seabed = new Noise(&sp->np_seabed, seed, csize.X, csize.Z);
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//// 3D terrain noise
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noise_cave1 = new Noise(&sp->np_cave1, seed, csize.X, csize.Y + 2, csize.Z);
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noise_cave2 = new Noise(&sp->np_cave2, seed, csize.X, csize.Y + 2, csize.Z);
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//// Biome noise
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noise_heat = new Noise(¶ms->np_biome_heat, seed, csize.X, csize.Z);
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@ -114,6 +117,8 @@ MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *
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MapgenFractal::~MapgenFractal()
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{
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delete noise_seabed;
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delete noise_cave1;
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delete noise_cave2;
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@ -132,20 +137,21 @@ MapgenFractalParams::MapgenFractalParams()
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spflags = 0;
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iterations = 9;
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scale_x = 1024;
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scale_y = 256;
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scale_z = 1024;
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scale_x = 1024.0;
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scale_y = 256.0;
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scale_z = 1024.0;
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offset_x = -1.75;
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offset_y = 0;
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offset_z = 0;
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offset_y = 0.0;
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offset_z = 0.0;
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slice_w = 0.5;
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julia_x = 0.33;
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julia_y = 0.33;
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julia_z = 0.33;
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julia_w = 0.33;
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np_cave1 = NoiseParams(0, 12, v3f(128, 128, 128), 52534, 4, 0.5, 2.0);
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np_cave2 = NoiseParams(0, 12, v3f(128, 128, 128), 10325, 4, 0.5, 2.0);
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np_seabed = NoiseParams(-14, 9, v3f(600, 600, 600), 41900, 5, 0.6, 2.0);
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np_cave1 = NoiseParams(0, 12, v3f(128, 128, 128), 52534, 4, 0.5, 2.0);
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np_cave2 = NoiseParams(0, 12, v3f(128, 128, 128), 10325, 4, 0.5, 2.0);
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}
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@ -166,6 +172,7 @@ void MapgenFractalParams::readParams(const Settings *settings)
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settings->getFloatNoEx("mgfractal_julia_z", julia_z);
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settings->getFloatNoEx("mgfractal_julia_w", julia_w);
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settings->getNoiseParams("mgfractal_np_seabed", np_seabed);
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settings->getNoiseParams("mgfractal_np_cave1", np_cave1);
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settings->getNoiseParams("mgfractal_np_cave2", np_cave2);
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}
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@ -188,6 +195,7 @@ void MapgenFractalParams::writeParams(Settings *settings) const
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settings->setFloat("mgfractal_julia_z", julia_z);
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settings->setFloat("mgfractal_julia_w", julia_w);
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settings->setNoiseParams("mgfractal_np_seabed", np_seabed);
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settings->setNoiseParams("mgfractal_np_cave1", np_cave1);
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settings->setNoiseParams("mgfractal_np_cave2", np_cave2);
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}
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@ -198,15 +206,15 @@ void MapgenFractalParams::writeParams(Settings *settings) const
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int MapgenFractal::getGroundLevelAtPoint(v2s16 p)
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{
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s16 search_top = water_level + 128;
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s16 search_base = water_level;
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s16 level = -MAX_MAP_GENERATION_LIMIT;
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for (s16 y = search_top; y >= search_base; y--) {
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if (getTerrainAtPoint(p.X, y, p.Y))
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s16 search_start = 128;
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s16 search_end = -128;
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for (s16 y = search_start; y >= search_end; y--) {
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if (getFractalAtPoint(p.X, y, p.Y))
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return y;
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}
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return level;
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return -MAX_MAP_GENERATION_LIMIT;
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}
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@ -329,6 +337,8 @@ void MapgenFractal::calculateNoise()
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int y = node_min.Y - 1;
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int z = node_min.Z;
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noise_seabed->perlinMap2D(x, z);
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if (flags & MG_CAVES) {
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noise_cave1->perlinMap3D(x, y, z);
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noise_cave2->perlinMap3D(x, y, z);
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@ -350,7 +360,7 @@ void MapgenFractal::calculateNoise()
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}
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bool MapgenFractal::getTerrainAtPoint(s16 x, s16 y, s16 z)
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bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
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{
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float cx, cy, cz, cw, ox, oy, oz, ow;
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@ -368,22 +378,21 @@ bool MapgenFractal::getTerrainAtPoint(s16 x, s16 y, s16 z)
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cy = (float)y / scale_y + offset_y;
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cz = (float)z / scale_z + offset_z;
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cw = slice_w;
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ox = 0.0;
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oy = 0.0;
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oz = 0.0;
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ow = 0.0;
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ox = 0.0f;
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oy = 0.0f;
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oz = 0.0f;
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ow = 0.0f;
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}
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for (u16 iter = 0; iter < iterations; iter++) {
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// 4D "Roundy" Mandelbrot set
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float nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
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float ny = 2.0 * (ox * oy + oz * ow) + cy;
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float nz = 2.0 * (ox * oz + oy * ow) + cz;
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float nw = 2.0 * (ox * ow + oy * oz) + cw;
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float ny = 2.0f * (ox * oy + oz * ow) + cy;
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float nz = 2.0f * (ox * oz + oy * ow) + cz;
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float nw = 2.0f * (ox * ow + oy * oz) + cw;
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if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0) {
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if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
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return false;
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}
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ox = nx;
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oy = ny;
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@ -402,23 +411,29 @@ s16 MapgenFractal::generateTerrain()
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MapNode n_water(c_water_source);
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s16 stone_surface_max_y = -MAX_MAP_GENERATION_LIMIT;
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u32 index2d = 0;
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for (s16 z = node_min.Z; z <= node_max.Z; z++)
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for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
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u32 i = vm->m_area.index(node_min.X, y, z);
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for (s16 x = node_min.X; x <= node_max.X; x++, i++) {
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if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
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if (getTerrainAtPoint(x, y, z)) {
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vm->m_data[i] = n_stone;
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if (y > stone_surface_max_y)
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stone_surface_max_y = y;
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} else if (y <= water_level) {
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vm->m_data[i] = n_water;
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} else {
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vm->m_data[i] = n_air;
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for (s16 z = node_min.Z; z <= node_max.Z; z++) {
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for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
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u32 vi = vm->m_area.index(node_min.X, y, z);
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for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index2d++) {
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if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
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s16 seabed_height = noise_seabed->result[index2d];
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if (y <= seabed_height || getFractalAtPoint(x, y, z)) {
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vm->m_data[vi] = n_stone;
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if (y > stone_surface_max_y)
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stone_surface_max_y = y;
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} else if (y <= water_level) {
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vm->m_data[vi] = n_water;
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} else {
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vm->m_data[vi] = n_air;
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}
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}
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}
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index2d -= ystride;
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}
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index2d += ystride;
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}
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return stone_surface_max_y;
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@ -575,23 +590,32 @@ void MapgenFractal::dustTopNodes()
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void MapgenFractal::generateCaves(s16 max_stone_y)
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{
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if (max_stone_y >= node_min.Y) {
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u32 index = 0;
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u32 index = 0;
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for (s16 z = node_min.Z; z <= node_max.Z; z++)
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for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
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u32 i = vm->m_area.index(node_min.X, y, z);
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for (s16 x = node_min.X; x <= node_max.X; x++, i++, index++) {
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u32 vi = vm->m_area.index(node_min.X, y, z);
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for (s16 x = node_min.X; x <= node_max.X; x++, vi++, index++) {
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float d1 = contour(noise_cave1->result[index]);
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float d2 = contour(noise_cave2->result[index]);
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if (d1 * d2 > 0.3) {
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content_t c = vm->m_data[i].getContent();
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content_t c = vm->m_data[vi].getContent();
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if (!ndef->get(c).is_ground_content || c == CONTENT_AIR)
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continue;
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vm->m_data[i] = MapNode(CONTENT_AIR);
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vm->m_data[vi] = MapNode(CONTENT_AIR);
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}
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}
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}
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}
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}
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if (node_max.Y > MGFRACTAL_LARGE_CAVE_DEPTH)
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return;
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PseudoRandom ps(blockseed + 21343);
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u32 bruises_count = (ps.range(1, 4) == 1) ? ps.range(1, 2) : 0;
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for (u32 i = 0; i < bruises_count; i++) {
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CaveFractal cave(this, &ps);
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cave.makeCave(node_min, node_max, max_stone_y);
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}
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}
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