cube-game-plus-plus/server/packets/WorldPackets.cpp

#include "server/packets/WorldPackets.h"
#include "common/network/Packets.h"

void WorldPackets::sendChunk(ServerPlayer& p, World& w, int cx, int cz) {
    constexpr int size = BlockStorage::SEGMENT;
    cx *= size;
    cz *= size;
    OutPacket out = OutPacket::reliable(
        w.blocks.getHeight() * size * size * sizeof(Block::Id) * 2 + 10);
    out.writeU16(Packets::S_WORLD_SEGMENT);
    out.writeS32(cx);
    out.writeS32(cz);
    int endX = cx + size;
    int endZ = cz + size;

    Block::Id current = w.blocks.get(cx, 0, cz);
    uint16 counter = 0;

    for(int y = 0; y < w.blocks.getHeight(); y++) {
        for(int x = cx; x < endX; x++) {
            for(int z = cz; z < endZ; z++) {
                Block::Id id = w.blocks.get(x, y, z);
                if(current == id && counter < 65535) {
                    counter++;
                } else {
                    out.writeU16(current);
                    out.writeU16(counter);
                    current = id;
                    counter = 1;
                }
            }
        }
    }
    out.writeU16(current);
    out.writeU16(counter);

    p.send(out);
}