#include "Globals.h"
#include "ChunkDataSerializer.h"
#include "Protocol_1_8.h"
#include "Protocol_1_9.h"
#include "../ClientHandle.h"
#include "../WorldStorage/FastNBT.h"
#include "Palettes/Upgrade.h"
#include "Palettes/Palette_1_13.h"
#include "Palettes/Palette_1_13_1.h"
#include "Palettes/Palette_1_14.h"
namespace
{
std::pair<UInt16, size_t> GetSectionBitmask(const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData)
{
size_t Present = 0;
UInt16 Mask = 0;
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
Present++;
Mask |= (1 << Y);
});
return { Mask, Present };
}
auto PaletteLegacy(const BLOCKTYPE a_BlockType, const NIBBLETYPE a_Meta)
{
return (a_BlockType << 4) | a_Meta;
}
auto Palette393(const BLOCKTYPE a_BlockType, const NIBBLETYPE a_Meta)
{
return Palette_1_13::From(PaletteUpgrade::FromBlock(a_BlockType, a_Meta));
}
auto Palette401(const BLOCKTYPE a_BlockType, const NIBBLETYPE a_Meta)
{
return Palette_1_13_1::From(PaletteUpgrade::FromBlock(a_BlockType, a_Meta));
}
auto Palette477(const BLOCKTYPE a_BlockType, const NIBBLETYPE a_Meta)
{
return Palette_1_14::From(PaletteUpgrade::FromBlock(a_BlockType, a_Meta));
}
}
////////////////////////////////////////////////////////////////////////////////
// cChunkDataSerializer:
cChunkDataSerializer::cChunkDataSerializer(const eDimension a_Dimension) :
m_Packet(512 KiB),
m_Dimension(a_Dimension)
{
}
void cChunkDataSerializer::SendToClients(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap, const ClientHandles & a_SendTo)
{
for (const auto & Client : a_SendTo)
{
switch (static_cast<cProtocol::Version>(Client->GetProtocolVersion()))
{
case cProtocol::Version::v1_8_0:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v47);
continue;
}
case cProtocol::Version::v1_9_0:
case cProtocol::Version::v1_9_1:
case cProtocol::Version::v1_9_2:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v107);
continue;
}
case cProtocol::Version::v1_9_4:
case cProtocol::Version::v1_10_0:
case cProtocol::Version::v1_11_0:
case cProtocol::Version::v1_11_1:
case cProtocol::Version::v1_12:
case cProtocol::Version::v1_12_1:
case cProtocol::Version::v1_12_2:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v110);
continue;
}
case cProtocol::Version::v1_13:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v393); // This version didn't last very long xD
continue;
}
case cProtocol::Version::v1_13_1:
case cProtocol::Version::v1_13_2:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v401);
continue;
}
case cProtocol::Version::v1_14:
case cProtocol::Version::v1_14_1:
case cProtocol::Version::v1_14_2:
case cProtocol::Version::v1_14_3:
case cProtocol::Version::v1_14_4:
{
Serialize(Client, a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap, CacheVersion::v477);
continue;
}
}
UNREACHABLE("Unknown chunk data serialization version");
}
// Our cache is only persistent during the function call:
for (auto & Cache : m_Cache)
{
Cache.Engaged = false;
}
}
inline void cChunkDataSerializer::Serialize(const ClientHandles::value_type & a_Client, const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap, const CacheVersion a_CacheVersion)
{
auto & Cache = m_Cache[static_cast<size_t>(a_CacheVersion)];
if (Cache.Engaged)
{
// Success! We've done it already, just re-use:
a_Client->SendChunkData(a_ChunkX, a_ChunkZ, Cache.ToSend);
return;
}
switch (a_CacheVersion)
{
case CacheVersion::v47:
{
Serialize47(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
case CacheVersion::v107:
{
Serialize107(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
case CacheVersion::v110:
{
Serialize110(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
case CacheVersion::v393:
{
Serialize393<&Palette393>(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
case CacheVersion::v401:
{
Serialize393<&Palette401>(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
case CacheVersion::v477:
{
Serialize477(a_ChunkX, a_ChunkZ, a_BlockData, a_LightData, a_BiomeMap);
break;
}
}
CompressPacketInto(Cache);
ASSERT(Cache.Engaged); // Cache must be populated now
a_Client->SendChunkData(a_ChunkX, a_ChunkZ, Cache.ToSend);
}
inline void cChunkDataSerializer::Serialize47(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap)
{
// This function returns the fully compressed packet (including packet size), not the raw packet!
const auto Bitmask = GetSectionBitmask(a_BlockData, a_LightData);
// Create the packet:
m_Packet.WriteVarInt32(0x21); // Packet id (Chunk Data packet)
m_Packet.WriteBEInt32(a_ChunkX);
m_Packet.WriteBEInt32(a_ChunkZ);
m_Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
// Minecraft 1.8 does not like completely empty packets
// Send one completely empty chunk section if this is the case
m_Packet.WriteBEUInt16(Bitmask.first ? Bitmask.first : 1);
// Write the chunk size:
// Account for the single empty section if sending an empty chunk
const int BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const size_t ChunkSize = (
(Bitmask.second ? Bitmask.second : 1) * (ChunkBlockData::SectionBlockCount * 2 + ChunkLightData::SectionLightCount * 2) + // Blocks and lighting
BiomeDataSize // Biome data
);
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSize));
// Chunk written as seperate arrays of (blocktype + meta), blocklight and skylight
// each array stores all present sections of the same kind packed together
// Write the block types to the packet:
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
const bool BlocksExist = Blocks != nullptr;
const bool MetasExist = Metas != nullptr;
for (size_t BlockIdx = 0; BlockIdx != ChunkBlockData::SectionBlockCount; ++BlockIdx)
{
BLOCKTYPE BlockType = BlocksExist ? (*Blocks)[BlockIdx] : 0;
NIBBLETYPE BlockMeta = MetasExist ? cChunkDef::ExpandNibble(Metas->data(), BlockIdx) : 0;
m_Packet.WriteBEUInt8(static_cast<unsigned char>(BlockType << 4) | BlockMeta);
m_Packet.WriteBEUInt8(static_cast<unsigned char>(BlockType >> 4));
}
});
// Write the block lights:
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
if (BlockLights == nullptr)
{
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultBlockLightValue);
}
else
{
m_Packet.WriteBuf(BlockLights->data(), BlockLights->size());
}
});
// Write the sky lights:
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
if (SkyLights == nullptr)
{
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultSkyLightValue);
}
else
{
m_Packet.WriteBuf(SkyLights->data(), SkyLights->size());
}
});
// Serialize a single empty section if sending an empty chunk
if (!Bitmask.first)
{
// Block data (all air)
for (size_t i = 0; i < ChunkBlockData::SectionBlockCount * 2; i++)
{
m_Packet.WriteBEUInt8(0);
}
// Light data (XXX: sky light is not sent if in the nether)
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultSkyLightValue);
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultSkyLightValue);
}
// Write the biome data:
m_Packet.WriteBuf(a_BiomeMap, BiomeDataSize);
}
inline void cChunkDataSerializer::Serialize107(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap)
{
// This function returns the fully compressed packet (including packet size), not the raw packet!
// Below variables tagged static because of https://developercommunity.visualstudio.com/content/problem/367326
static constexpr UInt8 BitsPerEntry = 13;
static constexpr size_t ChunkSectionDataArraySize = (ChunkBlockData::SectionBlockCount * BitsPerEntry) / 8 / 8; // Convert from bit count to long count
const auto Bitmask = GetSectionBitmask(a_BlockData, a_LightData);
// Create the packet:
m_Packet.WriteVarInt32(0x20); // Packet id (Chunk Data packet)
m_Packet.WriteBEInt32(a_ChunkX);
m_Packet.WriteBEInt32(a_ChunkZ);
m_Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
m_Packet.WriteVarInt32(Bitmask.first);
size_t ChunkSectionSize = (
1 + // Bits per block - set to 13, so the global palette is used and the palette has a length of 0
1 + // Palette length
2 + // Data array length VarInt - 2 bytes for the current value
ChunkSectionDataArraySize * 8 + // Actual block data - multiplied by 8 because first number is longs
ChunkLightData::SectionLightCount // Block light
);
if (m_Dimension == dimOverworld)
{
// Sky light is only sent in the overworld.
ChunkSectionSize += ChunkLightData::SectionLightCount;
}
const size_t BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const size_t ChunkSize = (
ChunkSectionSize * Bitmask.second +
BiomeDataSize
);
// Write the chunk size:
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSize));
// Write each chunk section...
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
m_Packet.WriteBEUInt8(BitsPerEntry);
m_Packet.WriteVarInt32(0); // Palette length is 0
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSectionDataArraySize));
WriteBlockSectionSeamless<&PaletteLegacy>(Blocks, Metas, BitsPerEntry);
WriteLightSectionGrouped(BlockLights, SkyLights);
});
// Write the biome data
m_Packet.WriteBuf(a_BiomeMap, BiomeDataSize);
}
inline void cChunkDataSerializer::Serialize110(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap)
{
// This function returns the fully compressed packet (including packet size), not the raw packet!
// Below variables tagged static because of https://developercommunity.visualstudio.com/content/problem/367326
static constexpr UInt8 BitsPerEntry = 13;
static constexpr size_t ChunkSectionDataArraySize = (ChunkBlockData::SectionBlockCount * BitsPerEntry) / 8 / 8; // Convert from bit count to long count
const auto Bitmask = GetSectionBitmask(a_BlockData, a_LightData);
// Create the packet:
m_Packet.WriteVarInt32(0x20); // Packet id (Chunk Data packet)
m_Packet.WriteBEInt32(a_ChunkX);
m_Packet.WriteBEInt32(a_ChunkZ);
m_Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
m_Packet.WriteVarInt32(Bitmask.first);
size_t ChunkSectionSize = (
1 + // Bits per block - set to 13, so the global palette is used and the palette has a length of 0
1 + // Palette length
2 + // Data array length VarInt - 2 bytes for the current value
ChunkSectionDataArraySize * 8 + // Actual block data - multiplied by 8 because first number is longs
ChunkLightData::SectionLightCount // Block light
);
if (m_Dimension == dimOverworld)
{
// Sky light is only sent in the overworld.
ChunkSectionSize += ChunkLightData::SectionLightCount;
}
const size_t BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const size_t ChunkSize = (
ChunkSectionSize * Bitmask.second +
BiomeDataSize
);
// Write the chunk size:
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSize));
// Write each chunk section...
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
m_Packet.WriteBEUInt8(BitsPerEntry);
m_Packet.WriteVarInt32(0); // Palette length is 0
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSectionDataArraySize));
WriteBlockSectionSeamless<&PaletteLegacy>(Blocks, Metas, BitsPerEntry);
WriteLightSectionGrouped(BlockLights, SkyLights);
});
// Write the biome data
m_Packet.WriteBuf(a_BiomeMap, BiomeDataSize);
// Identify 1.9.4's tile entity list as empty
m_Packet.WriteBEUInt8(0);
}
template <auto Palette>
inline void cChunkDataSerializer::Serialize393(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap)
{
// This function returns the fully compressed packet (including packet size), not the raw packet!
// Below variables tagged static because of https://developercommunity.visualstudio.com/content/problem/367326
static constexpr UInt8 BitsPerEntry = 14;
static constexpr size_t ChunkSectionDataArraySize = (ChunkBlockData::SectionBlockCount * BitsPerEntry) / 8 / 8;
const auto Bitmask = GetSectionBitmask(a_BlockData, a_LightData);
// Create the packet:
m_Packet.WriteVarInt32(0x22); // Packet id (Chunk Data packet)
m_Packet.WriteBEInt32(a_ChunkX);
m_Packet.WriteBEInt32(a_ChunkZ);
m_Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
m_Packet.WriteVarInt32(Bitmask.first);
size_t ChunkSectionSize = (
1 + // Bits per entry, BEUInt8, 1 byte
m_Packet.GetVarIntSize(static_cast<UInt32>(ChunkSectionDataArraySize)) + // Field containing "size of whole section", VarInt32, variable size
ChunkSectionDataArraySize * 8 + // Actual section data, lots of bytes (multiplier 1 long = 8 bytes)
ChunkLightData::SectionLightCount // Size of blocklight which is always sent
);
if (m_Dimension == dimOverworld)
{
// Sky light is only sent in the overworld.
ChunkSectionSize += ChunkLightData::SectionLightCount;
}
const size_t BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const size_t ChunkSize = (
ChunkSectionSize * Bitmask.second +
BiomeDataSize * 4 // Biome data now BE ints
);
// Write the chunk size in bytes:
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSize));
// Write each chunk section...
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
m_Packet.WriteBEUInt8(BitsPerEntry);
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSectionDataArraySize));
WriteBlockSectionSeamless<Palette>(Blocks, Metas, BitsPerEntry);
WriteLightSectionGrouped(BlockLights, SkyLights);
});
// Write the biome data
for (size_t i = 0; i != BiomeDataSize; i++)
{
m_Packet.WriteBEUInt32(static_cast<UInt32>(a_BiomeMap[i]));
}
// Identify 1.9.4's tile entity list as empty
m_Packet.WriteVarInt32(0);
}
inline void cChunkDataSerializer::Serialize477(const int a_ChunkX, const int a_ChunkZ, const ChunkBlockData & a_BlockData, const ChunkLightData & a_LightData, const unsigned char * a_BiomeMap)
{
// This function returns the fully compressed packet (including packet size), not the raw packet!
// Below variables tagged static because of https://developercommunity.visualstudio.com/content/problem/367326
static constexpr UInt8 BitsPerEntry = 14;
static constexpr size_t ChunkSectionDataArraySize = (ChunkBlockData::SectionBlockCount * BitsPerEntry) / 8 / 8;
const auto Bitmask = GetSectionBitmask(a_BlockData, a_LightData);
// Create the packet:
m_Packet.WriteVarInt32(0x21); // Packet id (Chunk Data packet)
m_Packet.WriteBEInt32(a_ChunkX);
m_Packet.WriteBEInt32(a_ChunkZ);
m_Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
m_Packet.WriteVarInt32(Bitmask.first);
{
cFastNBTWriter Writer;
// TODO: client works fine without?
// std::array<Int64, 36> Longz = {};
// Writer.AddLongArray("MOTION_BLOCKING", Longz.data(), Longz.size());
Writer.Finish();
m_Packet.Write(Writer.GetResult().data(), Writer.GetResult().size());
}
const size_t ChunkSectionSize = (
2 + // Block count, BEInt16, 2 bytes
1 + // Bits per entry, BEUInt8, 1 byte
m_Packet.GetVarIntSize(static_cast<UInt32>(ChunkSectionDataArraySize)) + // Field containing "size of whole section", VarInt32, variable size
ChunkSectionDataArraySize * 8 // Actual section data, lots of bytes (multiplier 1 long = 8 bytes)
);
const size_t BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const size_t ChunkSize = (
ChunkSectionSize * Bitmask.second +
BiomeDataSize * 4 // Biome data now BE ints
);
// Write the chunk size in bytes:
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSize));
// Write each chunk section...
ChunkDef_ForEachSection(a_BlockData, a_LightData,
{
// Count non-air blocks.
Int16 BlockCount = 0;
if (Blocks != nullptr)
{
for (size_t i = 0; i != ChunkBlockData::SectionBlockCount; i++)
{
const BLOCKTYPE BlockType = (*Blocks)[i];
if (BlockType != E_BLOCK_AIR)
{
BlockCount++;
}
}
}
m_Packet.WriteBEInt16(BlockCount);
m_Packet.WriteBEUInt8(BitsPerEntry);
m_Packet.WriteVarInt32(static_cast<UInt32>(ChunkSectionDataArraySize));
WriteBlockSectionSeamless<&Palette477>(Blocks, Metas, BitsPerEntry);
});
// Write the biome data
for (size_t i = 0; i != BiomeDataSize; i++)
{
m_Packet.WriteBEUInt32(a_BiomeMap[i]);
}
// Identify 1.9.4's tile entity list as empty
m_Packet.WriteVarInt32(0);
}
template <auto Palette>
inline void cChunkDataSerializer::WriteBlockSectionSeamless(const ChunkBlockData::BlockArray * a_Blocks, const ChunkBlockData::MetaArray * a_Metas, const UInt8 a_BitsPerEntry)
{
// https://wiki.vg/Chunk_Format#Data_structure
// We shift a UInt64 by a_BitsPerEntry, the latter cannot be too big:
ASSERT(a_BitsPerEntry < 64);
UInt64 Buffer = 0; // A buffer to compose multiple smaller bitsizes into one 64-bit number
unsigned char BitIndex = 0; // The bit-position in Buffer that represents where to write next
const bool BlocksExist = a_Blocks != nullptr;
const bool MetasExist = a_Metas != nullptr;
for (size_t Index = 0; Index != ChunkBlockData::SectionBlockCount; Index++)
{
const BLOCKTYPE BlockType = BlocksExist ? (*a_Blocks)[Index] : 0;
const NIBBLETYPE BlockMeta = MetasExist ? cChunkDef::ExpandNibble(a_Metas->data(), Index) : 0;
const auto Value = Palette(BlockType, BlockMeta);
// Write as much as possible of Value, starting from BitIndex, into Buffer:
Buffer |= static_cast<UInt64>(Value) << BitIndex;
// The _signed_ count of bits in Value left to write
const auto Remaining = static_cast<char>(a_BitsPerEntry - (64 - BitIndex));
if (Remaining >= 0)
{
// There were some bits remaining: we've filled the buffer. Flush it:
m_Packet.WriteBEUInt64(Buffer);
// And write the remaining bits, setting the new BitIndex:
Buffer = static_cast<UInt64>(Value >> (a_BitsPerEntry - Remaining));
BitIndex = static_cast<unsigned char>(Remaining);
}
else
{
// It fit, excellent.
BitIndex += a_BitsPerEntry;
}
}
static_assert((ChunkBlockData::SectionBlockCount % 64) == 0, "Section must fit wholly into a 64-bit long array");
ASSERT(BitIndex == 0);
ASSERT(Buffer == 0);
}
inline void cChunkDataSerializer::WriteLightSectionGrouped(const ChunkLightData::LightArray * const a_BlockLights, const ChunkLightData::LightArray * const a_SkyLights)
{
// Write lighting:
if (a_BlockLights == nullptr)
{
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultBlockLightValue);
}
else
{
m_Packet.WriteBuf(a_BlockLights->data(), a_BlockLights->size());
}
// Skylight is only sent in the overworld; the nether and end do not use it:
if (m_Dimension == dimOverworld)
{
if (a_SkyLights == nullptr)
{
m_Packet.WriteBuf(ChunkLightData::SectionLightCount, ChunkLightData::DefaultSkyLightValue);
}
else
{
m_Packet.WriteBuf(a_SkyLights->data(), a_SkyLights->size());
}
}
}
inline void cChunkDataSerializer::CompressPacketInto(ChunkDataCache & a_Cache)
{
m_Compressor.ReadFrom(m_Packet);
m_Packet.CommitRead();
cProtocol_1_8_0::CompressPacket(m_Compressor, a_Cache.ToSend);
a_Cache.Engaged = true;
}
