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

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

PoweredRailTile::PoweredRailTile(int id) : BaseRailTile(id, true) {}

Icon* PoweredRailTile::getTexture(int face, int data) {
    if ((data & RAIL_DATA_BIT) == 0) {
        return icon;
    } else {
        return iconPowered;
    }
}

void PoweredRailTile::registerIcons(IconRegister* iconRegister) {
    BaseRailTile::registerIcons(iconRegister);
    iconPowered = iconRegister->registerIcon(getIconName() + L"_powered");
}

bool PoweredRailTile::findPoweredRailSignal(Level* level, int x, int y, int z,
                                            int data, bool forward,
                                            int searchDepth) {
    if (searchDepth >= 8) {
        return false;
    }

    int dir = data & RAIL_DIRECTION_MASK;

    bool checkBelow = true;
    switch (dir) {
        case DIR_FLAT_Z:
            if (forward) {
                z++;
            } else {
                z--;
            }
            break;
        case DIR_FLAT_X:
            if (forward) {
                x--;
            } else {
                x++;
            }
            break;
        case 2:
            if (forward) {
                x--;
            } else {
                x++;
                y++;
                checkBelow = false;
            }
            dir = DIR_FLAT_X;
            break;
        case 3:
            if (forward) {
                x--;
                y++;
                checkBelow = false;
            } else {
                x++;
            }
            dir = DIR_FLAT_X;
            break;
        case 4:
            if (forward) {
                z++;
            } else {
                z--;
                y++;
                checkBelow = false;
            }
            dir = DIR_FLAT_Z;
            break;
        case 5:
            if (forward) {
                z++;
                y++;
                checkBelow = false;
            } else {
                z--;
            }
            dir = DIR_FLAT_Z;
            break;
    }

    if (isSameRailWithPower(level, x, y, z, forward, searchDepth, dir)) {
        return true;
    }
    if (checkBelow &&
        isSameRailWithPower(level, x, y - 1, z, forward, searchDepth, dir)) {
        return true;
    }
    return false;
}

bool PoweredRailTile::isSameRailWithPower(Level* level, int x, int y, int z,
                                          bool forward, int searchDepth,
                                          int dir) {
    int tile = level->getTile(x, y, z);

    if (tile == id) {
        int tileData = level->getData(x, y, z);
        int myDir = tileData & RAIL_DIRECTION_MASK;

        if (dir == DIR_FLAT_X &&
            (myDir == DIR_FLAT_Z || myDir == 4 || myDir == 5)) {
            return false;
        }
        if (dir == DIR_FLAT_Z &&
            (myDir == DIR_FLAT_X || myDir == 2 || myDir == 3)) {
            return false;
        }

        if ((tileData & RAIL_DATA_BIT) != 0) {
            if (level->hasNeighborSignal(x, y, z)) {
                return true;
            } else {
                return findPoweredRailSignal(level, x, y, z, tileData, forward,
                                             searchDepth + 1);
            }
        }
    }

    return false;
}

void PoweredRailTile::updateState(Level* level, int x, int y, int z, int data,
                                  int dir, int type) {
    bool signal = level->hasNeighborSignal(x, y, z);
    signal = signal || findPoweredRailSignal(level, x, y, z, data, true, 0) ||
             findPoweredRailSignal(level, x, y, z, data, false, 0);

    bool changed = false;
    if (signal && (data & RAIL_DATA_BIT) == 0) {
        level->setData(x, y, z, dir | RAIL_DATA_BIT, Tile::UPDATE_ALL);
        changed = true;
    } else if (!signal && (data & RAIL_DATA_BIT) != 0) {
        level->setData(x, y, z, dir, Tile::UPDATE_ALL);
        changed = true;
    }

    // usually the level only updates neighbors that are in the same
    // y plane as the current tile, but sloped rails may need to
    // update tiles above or below it as well
    if (changed) {
        level->updateNeighborsAt(x, y - 1, z, id);
        if (dir == 2 || dir == 3 || dir == 4 || dir == 5) {
            level->updateNeighborsAt(x, y + 1, z, id);
        }
    }
}