4jcraft/Minecraft.World/WorldGen/Features/LakeFeature.cpp

#include "../../Platform/stdafx.h"
#include "LakeFeature.h"
#include "../../Headers/net.minecraft.world.level.h"
#include "../../Headers/net.minecraft.world.level.tile.h"
#include "../../Headers/net.minecraft.world.level.biome.h"

LakeFeature::LakeFeature(int tile) { this->tile = tile; }

bool LakeFeature::place(Level* level, Random* random, int x, int y, int z) {
    x -= 8;
    z -= 8;
    while (y > 5 && level->isEmptyTile(x, y, z)) y--;
    if (y <= 4) {
        return false;
    }

    y -= 4;

    bool grid[16 * 16 * 8] = {0};

    LevelGenerationOptions* levelGenOptions = NULL;
    if (app.getLevelGenerationOptions() != NULL) {
        levelGenOptions = app.getLevelGenerationOptions();

        int minX = x;
        int minY = y;
        int minZ = z;

        int maxX = x + 16;
        int maxY = y + 8;
        int maxZ = z + 16;

        bool intersects = levelGenOptions->checkIntersects(minX, minY, minZ,
                                                           maxX, maxY, maxZ);
        if (intersects) {
            // app.DebugPrintf("Skipping reeds feature generation as it overlaps
            // a game rule structure\n");
            return false;
        }
    }

    int spots = random->nextInt(4) + 4;
    for (int i = 0; i < spots; i++) {
        double xr = random->nextDouble() * 6 + 3;
        double yr = random->nextDouble() * 4 + 2;
        double zr = random->nextDouble() * 6 + 3;

        double xp = random->nextDouble() * (16 - xr - 2) + 1 + xr / 2;
        double yp = random->nextDouble() * (8 - yr - 4) + 2 + yr / 2;
        double zp = random->nextDouble() * (16 - zr - 2) + 1 + zr / 2;

        for (int xx = 1; xx < 15; xx++) {
            for (int zz = 1; zz < 15; zz++) {
                for (int yy = 1; yy < 7; yy++) {
                    double xd = ((xx - xp) / (xr / 2));
                    double yd = ((yy - yp) / (yr / 2));
                    double zd = ((zz - zp) / (zr / 2));
                    double d = xd * xd + yd * yd + zd * zd;
                    if (d < 1) grid[((xx) * 16 + (zz)) * 8 + (yy)] = true;
                }
            }
        }
    }

    for (int xx = 0; xx < 16; xx++) {
        for (int zz = 0; zz < 16; zz++) {
            for (int yy = 0; yy < 8; yy++) {
                bool check =
                    !grid[((xx) * 16 + (zz)) * 8 + (yy)] &&
                    ((xx < 15 && grid[((xx + 1) * 16 + (zz)) * 8 + (yy)])  //
                     || (xx > 0 && grid[((xx - 1) * 16 + (zz)) * 8 + (yy)]) ||
                     (zz < 15 && grid[((xx) * 16 + (zz + 1)) * 8 + (yy)]) ||
                     (zz > 0 && grid[((xx) * 16 + (zz - 1)) * 8 + (yy)]) ||
                     (yy < 7 && grid[((xx) * 16 + (zz)) * 8 + (yy + 1)]) ||
                     (yy > 0 && grid[((xx) * 16 + (zz)) * 8 + (yy - 1)]));

                if (check) {
                    Material* m = level->getMaterial(x + xx, y + yy, z + zz);
                    if (yy >= 4 && m->isLiquid()) return false;
                    if (yy < 4 &&
                        (!m->isSolid() &&
                         level->getTile(x + xx, y + yy, z + zz) != tile))
                        return false;
                }
            }
        }
    }

    for (int xx = 0; xx < 16; xx++) {
        for (int zz = 0; zz < 16; zz++) {
            for (int yy = 0; yy < 8; yy++) {
                if (grid[((xx) * 16 + (zz)) * 8 + (yy)]) {
                    level->setTileAndData(x + xx, y + yy, z + zz,
                                          yy >= 4 ? 0 : tile, 0,
                                          Tile::UPDATE_CLIENTS);
                }
            }
        }
    }

    for (int xx = 0; xx < 16; xx++) {
        for (int zz = 0; zz < 16; zz++) {
            for (int yy = 4; yy < 8; yy++) {
                if (grid[((xx) * 16 + (zz)) * 8 + (yy)]) {
                    if (level->getTile(x + xx, y + yy - 1, z + zz) ==
                            Tile::dirt_Id &&
                        level->getBrightness(LightLayer::Sky, x + xx, y + yy,
                                             z + zz) > 0) {
                        Biome* b = level->getBiome(x + xx, z + zz);
                        if (b->topMaterial == Tile::mycel_Id)
                            level->setTileAndData(x + xx, y + yy - 1, z + zz,
                                                  Tile::mycel_Id, 0,
                                                  Tile::UPDATE_CLIENTS);
                        else
                            level->setTileAndData(x + xx, y + yy - 1, z + zz,
                                                  Tile::grass_Id, 0,
                                                  Tile::UPDATE_CLIENTS);
                    }
                }
            }
        }
    }

    if (Tile::tiles[tile]->material == Material::lava) {
        for (int xx = 0; xx < 16; xx++) {
            for (int zz = 0; zz < 16; zz++) {
                for (int yy = 0; yy < 8; yy++) {
                    bool check =
                        !grid[((xx) * 16 + (zz)) * 8 + (yy)] &&
                        ((xx < 15 &&
                          grid[(((xx + 1) * 16 + (zz)) * 8 + (yy))]) ||
                         (xx > 0 &&
                          grid[(((xx - 1) * 16 + (zz)) * 8 + (yy))]) ||
                         (zz < 15 &&
                          grid[(((xx) * 16 + (zz + 1)) * 8 + (yy))]) ||
                         (zz > 0 &&
                          grid[(((xx) * 16 + (zz - 1)) * 8 + (yy))]) ||
                         (yy < 7 &&
                          grid[(((xx) * 16 + (zz)) * 8 + (yy + 1))]) ||
                         (yy > 0 && grid[(((xx) * 16 + (zz)) * 8 + (yy - 1))]));

                    if (check) {
                        if ((yy < 4 || random->nextInt(2) != 0) &&
                            level->getMaterial(x + xx, y + yy, z + zz)
                                ->isSolid()) {
                            level->setTileAndData(x + xx, y + yy, z + zz,
                                                  Tile::stone_Id, 0,
                                                  Tile::UPDATE_CLIENTS);
                        }
                    }
                }
            }
        }
    }

    // 4J - brought forward from 1.8.2
    if (Tile::tiles[tile]->material == Material::water) {
        for (int xx = 0; xx < 16; xx++) {
            for (int zz = 0; zz < 16; zz++) {
                int yy = 4;
                if (level->shouldFreezeIgnoreNeighbors(x + xx, y + yy, z + zz))
                    level->setTileAndData(x + xx, y + yy, z + zz, Tile::ice_Id,
                                          0, Tile::UPDATE_CLIENTS);
            }
        }
    }

    return true;
}