4jcraft/Minecraft.World/Blocks/LiquidTileDynamic.cpp

#include "../Platform/stdafx.h"
#include "../Headers/net.minecraft.world.level.h"
#include "LiquidTileDynamic.h"
#include "../Headers/net.minecraft.world.level.dimension.h"

LiquidTileDynamic::LiquidTileDynamic(int id, Material* material)
    : LiquidTile(id, material) {
    maxCount = 0;
    result = new bool[4];
    dist = new int[4];
    m_iterativeInstatick = false;
}

LiquidTileDynamic::~LiquidTileDynamic() {
    delete[] result;
    delete[] dist;
}

void LiquidTileDynamic::setStatic(Level* level, int x, int y, int z) {
    int d = level->getData(x, y, z);
    level->setTileAndData(x, y, z, id + 1, d, Tile::UPDATE_CLIENTS);
}

bool LiquidTileDynamic::isPathfindable(LevelSource* level, int x, int y,
                                       int z) {
    return material != Material::lava;
}

void LiquidTileDynamic::iterativeTick(Level* level, int x, int y, int z,
                                      Random* random) {
    m_tilesToTick.push_back(LiquidTickData(level, x, y, z, random));

    int failsafe = 100;
    while ((m_tilesToTick.size() > 0) && (failsafe > 0)) {
        LiquidTickData tickData = m_tilesToTick.front();
        m_tilesToTick.pop_front();
        mainTick(tickData.level, tickData.x, tickData.y, tickData.z,
                 tickData.random);
        failsafe--;
    }
    m_tilesToTick.clear();
}

void LiquidTileDynamic::tick(Level* level, int x, int y, int z,
                             Random* random) {
    if (!m_iterativeInstatick && level->getInstaTick()) {
        m_iterativeInstatick = true;
        iterativeTick(level, x, y, z, random);
        m_iterativeInstatick = false;
    } else if (m_iterativeInstatick && level->getInstaTick()) {
        m_tilesToTick.push_back(LiquidTickData(level, x, y, z, random));
    } else {
        mainTick(level, x, y, z, random);
    }
}

// 4J Stu - Split off what was the tick function to be able to change between
// recursive and iterative ticking This is to fix the stack overflow that occurs
// sometimes when instaticking on level gen.
void LiquidTileDynamic::mainTick(Level* level, int x, int y, int z,
                                 Random* random) {
    int depth = getDepth(level, x, y, z);

    int dropOff = 1;
    if (material == Material::lava && !level->dimension->ultraWarm) dropOff = 2;

    bool becomeStatic = true;
    int tickDelay = getTickDelay(level);
    if (depth > 0) {
        int highest = -100;
        maxCount = 0;
        highest = getHighest(level, x - 1, y, z, highest);
        highest = getHighest(level, x + 1, y, z, highest);
        highest = getHighest(level, x, y, z - 1, highest);
        highest = getHighest(level, x, y, z + 1, highest);

        int newDepth = highest + dropOff;
        if (newDepth >= 8 || highest < 0) {
            newDepth = -1;
        }
        if (getDepth(level, x, y + 1, z) >= 0) {
            int above = getDepth(level, x, y + 1, z);
            if (above >= 8)
                newDepth = above;
            else
                newDepth = above + 8;
        }
        if (maxCount >= 2 && material == Material::water) {
            // Only spread spring if it's on top of an existing spring, or
            // on top of solid ground.
            if (level->getMaterial(x, y - 1, z)->isSolid()) {
                newDepth = 0;
            } else if (level->getMaterial(x, y - 1, z) == material &&
                       level->getData(x, y - 1, z) == 0) {
                newDepth = 0;
            }
        }
        if (material == Material::lava) {
            if (depth < 8 && newDepth < 8) {
                if (newDepth > depth) {
                    if (random->nextInt(4) != 0) {
                        tickDelay = tickDelay * 4;
                    }
                }
            }
        }
        if (newDepth == depth) {
            if (becomeStatic) {
                setStatic(level, x, y, z);
            }
        } else {
            depth = newDepth;
            if (depth < 0) {
                level->removeTile(x, y, z);
            } else {
                level->setData(x, y, z, depth, Tile::UPDATE_CLIENTS);
                level->addToTickNextTick(x, y, z, id, tickDelay);
                level->updateNeighborsAt(x, y, z, id);
            }
        }
    } else {
        setStatic(level, x, y, z);
    }
    if (canSpreadTo(level, x, y - 1, z)) {
        if (material == Material::lava) {
            if (level->getMaterial(x, y - 1, z) == Material::water) {
                level->setTileAndUpdate(x, y - 1, z, Tile::stone_Id);
                fizz(level, x, y - 1, z);
                return;
            }
        }

        if (depth >= 8)
            trySpreadTo(level, x, y - 1, z, depth);
        else
            trySpreadTo(level, x, y - 1, z, depth + 8);
    } else if (depth >= 0 &&
               (depth == 0 || isWaterBlocking(level, x, y - 1, z))) {
        bool* spreads = getSpread(level, x, y, z);
        int neighbor = depth + dropOff;
        if (depth >= 8) {
            neighbor = 1;
        }
        if (neighbor >= 8) return;
        if (spreads[0]) trySpreadTo(level, x - 1, y, z, neighbor);
        if (spreads[1]) trySpreadTo(level, x + 1, y, z, neighbor);
        if (spreads[2]) trySpreadTo(level, x, y, z - 1, neighbor);
        if (spreads[3]) trySpreadTo(level, x, y, z + 1, neighbor);
    }
}

void LiquidTileDynamic::trySpreadTo(Level* level, int x, int y, int z,
                                    int neighbor) {
    if (canSpreadTo(level, x, y, z)) {
        {
            int old = level->getTile(x, y, z);
            if (old > 0) {
                if (material == Material::lava) {
                    fizz(level, x, y, z);
                } else {
                    Tile::tiles[old]->spawnResources(
                        level, x, y, z, level->getData(x, y, z), 0);
                }
            }
        }
        level->setTileAndData(x, y, z, id, neighbor, Tile::UPDATE_ALL);
    }
}

int LiquidTileDynamic::getSlopeDistance(Level* level, int x, int y, int z,
                                        int pass, int from) {
    int lowest = 1000;
    for (int d = 0; d < 4; d++) {
        if (d == 0 && from == 1) continue;
        if (d == 1 && from == 0) continue;
        if (d == 2 && from == 3) continue;
        if (d == 3 && from == 2) continue;

        int xx = x;
        int yy = y;
        int zz = z;

        if (d == 0) xx--;
        if (d == 1) xx++;
        if (d == 2) zz--;
        if (d == 3) zz++;

        if (isWaterBlocking(level, xx, yy, zz)) {
            continue;
        } else if (level->getMaterial(xx, yy, zz) == material &&
                   level->getData(xx, yy, zz) == 0) {
            continue;
        } else {
            if (isWaterBlocking(level, xx, yy - 1, zz)) {
                if (pass < 4) {
                    int v = getSlopeDistance(level, xx, yy, zz, pass + 1, d);
                    if (v < lowest) lowest = v;
                }
            } else {
                return pass;
            }
        }
    }
    return lowest;
}

bool* LiquidTileDynamic::getSpread(Level* level, int x, int y, int z) {
    for (int d = 0; d < 4; d++) {
        dist[d] = 1000;
        int xx = x;
        int yy = y;
        int zz = z;

        if (d == 0) xx--;
        if (d == 1) xx++;
        if (d == 2) zz--;
        if (d == 3) zz++;
        if (isWaterBlocking(level, xx, yy, zz)) {
            continue;
        } else if (level->getMaterial(xx, yy, zz) == material &&
                   level->getData(xx, yy, zz) == 0) {
            continue;
        }

        {
            if (isWaterBlocking(level, xx, yy - 1, zz)) {
                dist[d] = getSlopeDistance(level, xx, yy, zz, 1, d);
            } else {
                dist[d] = 0;
            }
        }
    }

    int lowest = dist[0];
    for (int d = 1; d < 4; d++) {
        if (dist[d] < lowest) lowest = dist[d];
    }

    for (int d = 0; d < 4; d++) {
        result[d] = (dist[d] == lowest);
    }
    return result;
}

bool LiquidTileDynamic::isWaterBlocking(Level* level, int x, int y, int z) {
    int t = level->getTile(x, y, z);
    if (t == Tile::door_wood_Id || t == Tile::door_iron_Id ||
        t == Tile::sign_Id || t == Tile::ladder_Id || t == Tile::reeds_Id) {
        return true;
    }
    if (t == 0) return false;
    Material* m = Tile::tiles[t]->material;
    if (m == Material::portal) return true;
    if (m->blocksMotion()) return true;
    return false;
}

int LiquidTileDynamic::getHighest(Level* level, int x, int y, int z,
                                  int current) {
    int d = getDepth(level, x, y, z);
    if (d < 0) return current;
    if (d == 0) maxCount++;
    if (d >= 8) {
        d = 0;
    }
    return current < 0 || d < current ? d : current;
}

bool LiquidTileDynamic::canSpreadTo(Level* level, int x, int y, int z) {
    // 4J added - don't try and spread out of our restricted map. If we don't do
    // this check then tiles at the edge of the world will try and spread
    // outside as the outside tiles report that they contain only air. The fact
    // that this successfully spreads then updates the neighbours of the tile
    // outside of the map, one of which is the original tile just inside the
    // map, which gets set back to being dynamic, and added to the pending ticks
    // array.
    int xc = x >> 4;
    int zc = z >> 4;
    int ix = xc + (level->chunkSourceXZSize / 2);
    int iz = zc + (level->chunkSourceXZSize / 2);
    if ((ix < 0) || (ix >= level->chunkSourceXZSize)) return false;
    if ((iz < 0) || (iz >= level->chunkSourceXZSize)) return false;

    Material* target = level->getMaterial(x, y, z);
    if (target == material) return false;
    if (target == Material::lava) return false;
    return !isWaterBlocking(level, x, y, z);
}

void LiquidTileDynamic::onPlace(Level* level, int x, int y, int z) {
    LiquidTile::onPlace(level, x, y, z);
    if (level->getTile(x, y, z) == id) {
        level->addToTickNextTick(x, y, z, id, getTickDelay(level));
    }
}

bool LiquidTileDynamic::canInstantlyTick() { return true; }