mirror of
https://github.com/moparisthebest/minetest
synced 2024-11-15 13:55:11 -05:00
8591713405
In the calculation of y_start, when 'column height max' was large it caused nmin.Y + max_height > nmax.Y - max_height Now, in this situation y_start is set to the midpoint between nmin.Y and nmax.Y Limit y0 and y1 to between nmin.Y and nmax.Y, otherwise index calculation, which has no checks for limits, places them at unwanted locations in the voxelmanip
447 lines
11 KiB
C++
447 lines
11 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2014 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 "mg_ore.h"
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#include "mapgen.h"
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#include "noise.h"
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#include "util/numeric.h"
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#include "map.h"
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#include "log.h"
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FlagDesc flagdesc_ore[] = {
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{"absheight", OREFLAG_ABSHEIGHT},
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{"puff_cliffs", OREFLAG_PUFF_CLIFFS},
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{"puff_additive_composition", OREFLAG_PUFF_ADDITIVE},
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{NULL, 0}
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};
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///////////////////////////////////////////////////////////////////////////////
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OreManager::OreManager(IGameDef *gamedef) :
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ObjDefManager(gamedef, OBJDEF_ORE)
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{
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}
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size_t OreManager::placeAllOres(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
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{
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size_t nplaced = 0;
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for (size_t i = 0; i != m_objects.size(); i++) {
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Ore *ore = (Ore *)m_objects[i];
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if (!ore)
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continue;
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nplaced += ore->placeOre(mg, blockseed, nmin, nmax);
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blockseed++;
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}
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return nplaced;
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}
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void OreManager::clear()
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{
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for (size_t i = 0; i < m_objects.size(); i++) {
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Ore *ore = (Ore *)m_objects[i];
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delete ore;
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}
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m_objects.clear();
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}
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///////////////////////////////////////////////////////////////////////////////
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Ore::Ore()
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{
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flags = 0;
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noise = NULL;
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}
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Ore::~Ore()
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{
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delete noise;
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}
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void Ore::resolveNodeNames()
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{
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getIdFromNrBacklog(&c_ore, "", CONTENT_AIR);
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getIdsFromNrBacklog(&c_wherein);
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}
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size_t Ore::placeOre(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
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{
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int in_range = 0;
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in_range |= (nmin.Y <= y_max && nmax.Y >= y_min);
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if (flags & OREFLAG_ABSHEIGHT)
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in_range |= (nmin.Y >= -y_max && nmax.Y <= -y_min) << 1;
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if (!in_range)
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return 0;
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int actual_ymin, actual_ymax;
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if (in_range & ORE_RANGE_MIRROR) {
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actual_ymin = MYMAX(nmin.Y, -y_max);
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actual_ymax = MYMIN(nmax.Y, -y_min);
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} else {
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actual_ymin = MYMAX(nmin.Y, y_min);
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actual_ymax = MYMIN(nmax.Y, y_max);
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}
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if (clust_size >= actual_ymax - actual_ymin + 1)
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return 0;
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nmin.Y = actual_ymin;
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nmax.Y = actual_ymax;
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generate(mg->vm, mg->seed, blockseed, nmin, nmax, mg->biomemap);
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return 1;
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}
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///////////////////////////////////////////////////////////////////////////////
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void OreScatter::generate(MMVManip *vm, int mapseed, u32 blockseed,
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v3s16 nmin, v3s16 nmax, u8 *biomemap)
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{
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PcgRandom pr(blockseed);
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MapNode n_ore(c_ore, 0, ore_param2);
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u32 sizex = (nmax.X - nmin.X + 1);
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u32 volume = (nmax.X - nmin.X + 1) *
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(nmax.Y - nmin.Y + 1) *
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(nmax.Z - nmin.Z + 1);
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u32 csize = clust_size;
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u32 cvolume = csize * csize * csize;
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u32 nclusters = volume / clust_scarcity;
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for (u32 i = 0; i != nclusters; i++) {
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int x0 = pr.range(nmin.X, nmax.X - csize + 1);
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int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
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int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
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if ((flags & OREFLAG_USE_NOISE) &&
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(NoisePerlin3D(&np, x0, y0, z0, mapseed) < nthresh))
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continue;
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if (biomemap && !biomes.empty()) {
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u32 index = sizex * (z0 - nmin.Z) + (x0 - nmin.X);
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std::set<u8>::iterator it = biomes.find(biomemap[index]);
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if (it == biomes.end())
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continue;
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}
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for (u32 z1 = 0; z1 != csize; z1++)
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for (u32 y1 = 0; y1 != csize; y1++)
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for (u32 x1 = 0; x1 != csize; x1++) {
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if (pr.range(1, cvolume) > clust_num_ores)
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continue;
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u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
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if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
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continue;
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vm->m_data[i] = n_ore;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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void OreSheet::generate(MMVManip *vm, int mapseed, u32 blockseed,
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v3s16 nmin, v3s16 nmax, u8 *biomemap)
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{
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PcgRandom pr(blockseed + 4234);
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MapNode n_ore(c_ore, 0, ore_param2);
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u16 max_height = column_height_max;
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int y_start_min = nmin.Y + max_height;
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int y_start_max = nmax.Y - max_height;
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int y_start = y_start_min < y_start_max ?
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pr.range(y_start_min, y_start_max) :
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(y_start_min + y_start_max) / 2;
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if (!noise) {
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int sx = nmax.X - nmin.X + 1;
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int sz = nmax.Z - nmin.Z + 1;
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noise = new Noise(&np, 0, sx, sz);
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}
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noise->seed = mapseed + y_start;
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noise->perlinMap2D(nmin.X, nmin.Z);
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size_t index = 0;
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for (int z = nmin.Z; z <= nmax.Z; z++)
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for (int x = nmin.X; x <= nmax.X; x++, index++) {
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float noiseval = noise->result[index];
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if (noiseval < nthresh)
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continue;
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if (biomemap && !biomes.empty()) {
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std::set<u8>::iterator it = biomes.find(biomemap[index]);
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if (it == biomes.end())
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continue;
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}
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u16 height = pr.range(column_height_min, column_height_max);
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int ymidpoint = y_start + noiseval;
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int y0 = MYMAX(nmin.Y, ymidpoint - height * (1 - column_midpoint_factor));
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int y1 = MYMIN(nmax.Y, y0 + height - 1);
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for (int y = y0; y <= y1; y++) {
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u32 i = vm->m_area.index(x, y, z);
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if (!vm->m_area.contains(i))
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continue;
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if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
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continue;
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vm->m_data[i] = n_ore;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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OrePuff::OrePuff() :
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Ore()
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{
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noise_puff_top = NULL;
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noise_puff_bottom = NULL;
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}
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OrePuff::~OrePuff()
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{
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delete noise_puff_top;
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delete noise_puff_bottom;
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}
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void OrePuff::generate(MMVManip *vm, int mapseed, u32 blockseed,
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v3s16 nmin, v3s16 nmax, u8 *biomemap)
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{
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PcgRandom pr(blockseed + 4234);
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MapNode n_ore(c_ore, 0, ore_param2);
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int y_start = pr.range(nmin.Y, nmax.Y);
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if (!noise) {
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int sx = nmax.X - nmin.X + 1;
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int sz = nmax.Z - nmin.Z + 1;
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noise = new Noise(&np, 0, sx, sz);
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noise_puff_top = new Noise(&np_puff_top, 0, sx, sz);
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noise_puff_bottom = new Noise(&np_puff_bottom, 0, sx, sz);
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}
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noise->seed = mapseed + y_start;
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noise->perlinMap2D(nmin.X, nmin.Z);
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bool noise_generated = false;
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size_t index = 0;
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for (int z = nmin.Z; z <= nmax.Z; z++)
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for (int x = nmin.X; x <= nmax.X; x++, index++) {
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float noiseval = noise->result[index];
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if (noiseval < nthresh)
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continue;
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if (biomemap && !biomes.empty()) {
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std::set<u8>::iterator it = biomes.find(biomemap[index]);
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if (it == biomes.end())
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continue;
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}
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if (!noise_generated) {
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noise_generated = true;
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noise_puff_top->perlinMap2D(nmin.X, nmin.Z);
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noise_puff_bottom->perlinMap2D(nmin.X, nmin.Z);
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}
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float ntop = noise_puff_top->result[index];
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float nbottom = noise_puff_bottom->result[index];
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if (!(flags & OREFLAG_PUFF_CLIFFS)) {
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float ndiff = noiseval - nthresh;
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if (ndiff < 1.0f) {
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ntop *= ndiff;
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nbottom *= ndiff;
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}
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}
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int ymid = y_start;
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int y0 = ymid - nbottom;
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int y1 = ymid + ntop;
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if ((flags & OREFLAG_PUFF_ADDITIVE) && (y0 > y1))
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SWAP(int, y0, y1);
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for (int y = y0; y <= y1; y++) {
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u32 i = vm->m_area.index(x, y, z);
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if (!vm->m_area.contains(i))
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continue;
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if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
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continue;
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vm->m_data[i] = n_ore;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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void OreBlob::generate(MMVManip *vm, int mapseed, u32 blockseed,
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v3s16 nmin, v3s16 nmax, u8 *biomemap)
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{
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PcgRandom pr(blockseed + 2404);
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MapNode n_ore(c_ore, 0, ore_param2);
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u32 sizex = (nmax.X - nmin.X + 1);
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u32 volume = (nmax.X - nmin.X + 1) *
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(nmax.Y - nmin.Y + 1) *
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(nmax.Z - nmin.Z + 1);
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u32 csize = clust_size;
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u32 nblobs = volume / clust_scarcity;
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if (!noise)
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noise = new Noise(&np, mapseed, csize, csize, csize);
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for (u32 i = 0; i != nblobs; i++) {
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int x0 = pr.range(nmin.X, nmax.X - csize + 1);
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int y0 = pr.range(nmin.Y, nmax.Y - csize + 1);
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int z0 = pr.range(nmin.Z, nmax.Z - csize + 1);
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if (biomemap && !biomes.empty()) {
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u32 bmapidx = sizex * (z0 - nmin.Z) + (x0 - nmin.X);
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std::set<u8>::iterator it = biomes.find(biomemap[bmapidx]);
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if (it == biomes.end())
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continue;
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}
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bool noise_generated = false;
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noise->seed = blockseed + i;
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size_t index = 0;
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for (u32 z1 = 0; z1 != csize; z1++)
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for (u32 y1 = 0; y1 != csize; y1++)
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for (u32 x1 = 0; x1 != csize; x1++, index++) {
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u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
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if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
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continue;
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// Lazily generate noise only if there's a chance of ore being placed
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// This simple optimization makes calls 6x faster on average
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if (!noise_generated) {
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noise_generated = true;
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noise->perlinMap3D(x0, y0, z0);
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}
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float noiseval = noise->result[index];
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float xdist = (s32)x1 - (s32)csize / 2;
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float ydist = (s32)y1 - (s32)csize / 2;
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float zdist = (s32)z1 - (s32)csize / 2;
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noiseval -= (sqrt(xdist * xdist + ydist * ydist + zdist * zdist) / csize);
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if (noiseval < nthresh)
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continue;
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vm->m_data[i] = n_ore;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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OreVein::OreVein() :
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Ore()
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{
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noise2 = NULL;
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}
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OreVein::~OreVein()
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{
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delete noise2;
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}
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void OreVein::generate(MMVManip *vm, int mapseed, u32 blockseed,
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v3s16 nmin, v3s16 nmax, u8 *biomemap)
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{
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PcgRandom pr(blockseed + 520);
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MapNode n_ore(c_ore, 0, ore_param2);
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u32 sizex = (nmax.X - nmin.X + 1);
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if (!noise) {
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int sx = nmax.X - nmin.X + 1;
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int sy = nmax.Y - nmin.Y + 1;
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int sz = nmax.Z - nmin.Z + 1;
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noise = new Noise(&np, mapseed, sx, sy, sz);
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noise2 = new Noise(&np, mapseed + 436, sx, sy, sz);
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}
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bool noise_generated = false;
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size_t index = 0;
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for (int z = nmin.Z; z <= nmax.Z; z++)
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for (int y = nmin.Y; y <= nmax.Y; y++)
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for (int x = nmin.X; x <= nmax.X; x++, index++) {
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u32 i = vm->m_area.index(x, y, z);
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if (!vm->m_area.contains(i))
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continue;
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if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
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continue;
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if (biomemap && !biomes.empty()) {
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u32 bmapidx = sizex * (z - nmin.Z) + (x - nmin.X);
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std::set<u8>::iterator it = biomes.find(biomemap[bmapidx]);
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if (it == biomes.end())
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continue;
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}
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// Same lazy generation optimization as in OreBlob
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if (!noise_generated) {
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noise_generated = true;
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noise->perlinMap3D(nmin.X, nmin.Y, nmin.Z);
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noise2->perlinMap3D(nmin.X, nmin.Y, nmin.Z);
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}
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// randval ranges from -1..1
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float randval = (float)pr.next() / (pr.RANDOM_RANGE / 2) - 1.f;
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float noiseval = contour(noise->result[index]);
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float noiseval2 = contour(noise2->result[index]);
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if (noiseval * noiseval2 + randval * random_factor < nthresh)
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continue;
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vm->m_data[i] = n_ore;
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}
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}
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