Function grasses_for_tile

plugins/regrass.cpp:170–218

}

static void grasses_for_tile(color_ostream &out, vector<int32_t> &vec, df::map_block *block, int tx, int ty)
{   // Fill vector with sorted valid grass IDs.
    vec.clear();
    if (block->occupancy[tx][ty].bits.no_grow) {
        TRACE(log, out).print("Skipping grass collection: no_grow\n");
        return;
    }
    // TODO: Use world.area_grasses.layer_grasses[] if not options.new_grass?
    TRACE(log, out).print("Collecting grasses...\n");
    if (block->designation[tx][ty].bits.subterranean) {
        for (auto p_raw : world->raws.plants.grasses)
        {   // Sorted by df::plant_raw::index
            if (p_raw->flags.is_set(plant_raw_flags::BIOME_SUBTERRANEAN_WATER)) {
                TRACE(log, out).print("Cave grass: {}\n", p_raw->id);
                vec.push_back(p_raw->index);
            }
        }
    }
    else
    {   // Surface
        auto rgn_pos = Maps::getBlockTileBiomeRgn(block, df::coord2d(tx, ty));
        if (!rgn_pos.isValid())
        {   // No biome (happens in sky).
            TRACE(log, out).print("No grass: No biome region!\n");
            return;
        }

        auto &biome_info = *Maps::getRegionBiome(rgn_pos); // TODO: Cache grasses based on region?
        auto plant_biome_flag = ENUM_ATTR(biome_type, plant_raw_flag, Maps::getBiomeType(rgn_pos.x, rgn_pos.y));

        bool good = (biome_info.evilness < 33);
        bool evil = (biome_info.evilness > 65);
        bool savage = (biome_info.savagery > 65);

        for (auto p_raw : world->raws.plants.grasses)
        {   // Sorted by df::plant_raw::index
            auto &flags = p_raw->flags;
            if (flags.is_set(plant_biome_flag) &&
                (good || !flags.is_set(plant_raw_flags::GOOD)) &&
                (evil || !flags.is_set(plant_raw_flags::EVIL)) &&
                (savage || !flags.is_set(plant_raw_flags::SAVAGE)))
            {
                TRACE(log, out).print("Surface grass: {}\n", p_raw->id);
                vec.push_back(p_raw->index);
            }
        }
    }
    TRACE(log, out).print("Done collecting grasses.\n");
}

static bool regrass_events(color_ostream &out, const regrass_options &options, df::map_block *block, int tx, int ty)
{   // Utility fn to modify grass block events.