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

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

bool ReedsFeature::place(Level* level, Random* random, int x, int y, int z) {
    for (int i = 0; i < 20; i++) {
        int x2 = x + random->nextInt(4) - random->nextInt(4);
        int y2 = y;
        int z2 = z + random->nextInt(4) - random->nextInt(4);

        // 4J Stu Added to stop reed features generating areas previously place
        // by game rule generation
        if (app.getLevelGenerationOptions() != nullptr) {
            LevelGenerationOptions* levelGenOptions =
                app.getLevelGenerationOptions();
            bool intersects =
                levelGenOptions->checkIntersects(x2, y2, z2, x2, y2, z2);
            if (intersects) {
                // app.DebugPrintf("Skipping reeds feature generation as it
                // overlaps a game rule structure\n");
                continue;
            }
        }
        if (level->isEmptyTile(x2, y2, z2)) {
            if (level->getMaterial(x2 - 1, y2 - 1, z2) == Material::water ||
                level->getMaterial(x2 + 1, y2 - 1, z2) == Material::water ||
                level->getMaterial(x2, y2 - 1, z2 - 1) == Material::water ||
                level->getMaterial(x2, y2 - 1, z2 + 1) == Material::water) {
                int h = 2 + random->nextInt(random->nextInt(3) + 1);
                for (int yy = 0; yy < h; yy++) {
                    if (Tile::reeds->canSurvive(level, x2, y2 + yy, z2)) {
                        level->setTileAndData(x2, y2 + yy, z2, Tile::reeds_Id,
                                              0, Tile::UPDATE_CLIENTS);
                    }
                }
            }
        }
    }

    return true;
}