+#include "CongestionControl.hpp"
#include "Connection.hpp"
#include "ConnectionHandler.hpp"
#include "io.hpp"
#include "Packet.hpp"
-#include "../app/init.hpp"
-#include "../model/CompositeModel.hpp"
+#include "../app/error.hpp"
+#include "../geometry/const.hpp"
+#include "../model/Model.hpp"
#include "../world/Entity.hpp"
#include "../world/EntityState.hpp"
constexpr size_t Packet::PlayerCorrection::MAX_LEN;
constexpr size_t Packet::ChunkBegin::MAX_LEN;
constexpr size_t Packet::ChunkData::MAX_LEN;
+constexpr size_t Packet::BlockUpdate::MAX_LEN;
+constexpr size_t Packet::Message::MAX_LEN;
+constexpr size_t Packet::Message::MAX_MESSAGE_LEN;
+
+
+CongestionControl::CongestionControl()
+// I know, I know, it's an estimate (about 20 for IPv4, 48 for IPv6)
+: packet_overhead(20)
+// only sample every eighth packet for measuring RTT
+, sample_skip(8)
+, packets_lost(0)
+, packets_received(0)
+, packet_loss(0.0f)
+, stamp_last(0)
+, rtt(64.0f)
+, next_sample(1000)
+, tx_bytes(0)
+, rx_bytes(0)
+, tx_kbps(0.0f)
+, rx_kbps(0.0f)
+, mode(GOOD)
+// rtt > 75ms or packet loss > 5% is BAD
+, bad_rtt(75.0f)
+, bad_loss(0.05f)
+// rtt > 150ms or packet loss > 15% is UGLY
+, ugly_rtt(150.0f)
+, ugly_loss(0.15f)
+, mode_keep_time(1000) {
+ Uint32 now = SDL_GetTicks();
+ for (Uint32 &s : stamps) {
+ s = now;
+ }
+ next_sample += now;
+ mode_entered = now;
+ mode_reset = now;
+ mode_step = now;
+}
+
+void CongestionControl::PacketSent(uint16_t seq) noexcept {
+ if (!SamplePacket(seq)) {
+ return;
+ }
+ stamps[SampleIndex(seq)] = SDL_GetTicks();
+ stamp_last = seq;
+}
+
+void CongestionControl::PacketLost(uint16_t seq) noexcept {
+ ++packets_lost;
+ UpdatePacketLoss();
+ UpdateRTT(seq);
+}
+
+void CongestionControl::PacketReceived(uint16_t seq) noexcept {
+ ++packets_received;
+ UpdatePacketLoss();
+ UpdateRTT(seq);
+}
+
+void CongestionControl::UpdatePacketLoss() noexcept {
+ unsigned int packets_total = packets_lost + packets_received;
+ if (packets_total >= 256) {
+ packet_loss = float(packets_lost) / float(packets_total);
+ packets_lost = 0;
+ packets_received = 0;
+ }
+}
+
+void CongestionControl::UpdateRTT(uint16_t seq) noexcept {
+ if (!SamplePacket(seq)) return;
+ int16_t diff = int16_t(stamp_last) - int16_t(seq);
+ if (diff < 0 || diff > int(15 * sample_skip)) {
+ // packet outside observed frame
+ return;
+ }
+ int cur_rtt = SDL_GetTicks() - stamps[SampleIndex(seq)];
+ rtt += (cur_rtt - rtt) * 0.1f;
+}
+
+bool CongestionControl::SamplePacket(uint16_t seq) const noexcept {
+ return seq % sample_skip == 0;
+}
+
+size_t CongestionControl::SampleIndex(uint16_t seq) const noexcept {
+ return (seq / sample_skip) % 16;
+}
+
+void CongestionControl::PacketIn(const UDPpacket &pack) noexcept {
+ rx_bytes += pack.len + packet_overhead;
+ UpdateStats();
+}
+
+void CongestionControl::PacketOut(const UDPpacket &pack) noexcept {
+ tx_bytes += pack.len + packet_overhead;
+ UpdateStats();
+}
+
+void CongestionControl::UpdateStats() noexcept {
+ Uint32 now = SDL_GetTicks();
+ if (now < next_sample) {
+ // not yet
+ return;
+ }
+ tx_kbps = float(tx_bytes) * (1.0f / 1024.0f);
+ rx_kbps = float(rx_bytes) * (1.0f / 1024.0f);
+ tx_bytes = 0;
+ rx_bytes = 0;
+ next_sample += 1000;
+ UpdateMode();
+}
+
+void CongestionControl::UpdateMode() noexcept {
+ Mode now_mode = Conditions();
+ if (now_mode > mode) {
+ ChangeMode(now_mode);
+ } else if (now_mode < mode) {
+ CheckUpgrade(now_mode);
+ } else {
+ KeepMode();
+ }
+}
+
+void CongestionControl::CheckUpgrade(Mode m) noexcept {
+ Uint32 now = SDL_GetTicks();
+ Uint32 time_in_mode = now - mode_entered;
+ if (time_in_mode < mode_keep_time) {
+ return;
+ }
+ ChangeMode(m);
+}
+
+void CongestionControl::ChangeMode(Mode m) noexcept {
+ Uint32 now = SDL_GetTicks();
+ if (m > mode) {
+ // changed to worse mode
+ // if we spent less than 10 seconds in better mode
+ // double keep time till up to 64 seconds
+ if (now - mode_entered < 10000) {
+ if (mode_keep_time < 64000) {
+ mode_keep_time *= 2;
+ }
+ }
+ }
+ mode = m;
+ mode_entered = now;
+ mode_reset = mode_entered;
+}
+
+void CongestionControl::KeepMode() noexcept {
+ mode_reset = SDL_GetTicks();
+ // if in good mode for 10 seconds, halve keep time till down to one second
+ if (mode == GOOD && mode_keep_time > 1000 && mode_step - mode_reset > 10000) {
+ mode_keep_time /= 2;
+ mode_step = mode_reset;
+ }
+}
+
+CongestionControl::Mode CongestionControl::Conditions() const noexcept {
+ if (rtt > ugly_rtt || packet_loss > ugly_loss) {
+ return UGLY;
+ } else if (rtt > bad_rtt || packet_loss > bad_loss) {
+ return BAD;
+ } else {
+ return GOOD;
+ }
+}
+
Connection::Connection(const IPaddress &addr)
: handler(nullptr)
, addr(addr)
-, send_timer(500)
+// make sure a packet is sent at least every 50ms since packets contains
+// acks that the remote end will use to measure RTT
+, send_timer(50)
, recv_timer(10000)
, ctrl_out{ 0, 0xFFFF, 0xFFFFFFFF }
, ctrl_in{ 0, 0xFFFF, 0xFFFFFFFF }
throw NetError("SDLNet_UDP_Send");
}
+ if (HasHandler()) {
+ Handler().PacketOut(udp_pack);
+ Handler().PacketSent(seq);
+ }
+
FlagSend();
return seq;
}
}
Packet::TControl ctrl_new = pack.header.ctrl;
+ Handler().PacketIn(udp_pack);
Handler().Handle(udp_pack);
if (diff > 0) {
ConnectionHandler::ConnectionHandler()
-: packets_lost(0)
-, packets_received(0)
-, packet_loss(0.0f) {
+: cc() {
+
+}
+void ConnectionHandler::PacketSent(uint16_t seq) noexcept {
+ cc.PacketSent(seq);
}
void ConnectionHandler::PacketLost(uint16_t seq) {
OnPacketLost(seq);
- ++packets_lost;
- UpdatePacketLoss();
+ cc.PacketLost(seq);
}
void ConnectionHandler::PacketReceived(uint16_t seq) {
OnPacketReceived(seq);
- ++packets_received;
- UpdatePacketLoss();
+ cc.PacketReceived(seq);
}
-void ConnectionHandler::UpdatePacketLoss() noexcept {
- unsigned int packets_total = packets_lost + packets_received;
- if (packets_total >= 256) {
- packet_loss = float(packets_lost) / float(packets_total);
- packets_lost = 0;
- packets_received = 0;
- }
+void ConnectionHandler::PacketIn(const UDPpacket &pack) noexcept {
+ cc.PacketIn(pack);
+}
+
+void ConnectionHandler::PacketOut(const UDPpacket &pack) noexcept {
+ cc.PacketOut(pack);
}
return "ChunkBegin";
case ChunkData::TYPE:
return "ChunkData";
+ case BlockUpdate::TYPE:
+ return "BlockUpdate";
+ case Message::TYPE:
+ return "Message";
default:
return "Unknown";
}
}
}
+void Packet::Payload::Write(const glm::quat &val, size_t off) noexcept {
+ // find the largest component
+ float largest = 0.0f;
+ int largest_index = -1;
+ for (int i = 0; i < 4; ++i) {
+ float iabs = abs(val[i]);
+ if (iabs > largest) {
+ largest = iabs;
+ largest_index = i;
+ }
+ }
+ // make sure it's positive
+ const glm::quat q(val[largest_index] < 0.0f ? -val : val);
+ // move index to the two most significant bits
+ uint64_t packed = uint64_t(largest_index) << 62;
+ // we have to map from [-0.7072,0.7072] to [-524287,524287] and move into positive range
+ constexpr float conv = 524287.0f / 0.7072f;
+ // if largest is 1, the other three are 0
+ // precision of comparison is the interval of our mapping
+ if (abs(1.0 - largest) < (1.0f / conv)) {
+ packed |= 0x7FFFF7FFFF7FFFF;
+ } else {
+ // pack the three smaller components into 20bit ints each
+ int shift = 40;
+ for (int i = 0; i < 4; ++i) {
+ if (i != largest_index) {
+ packed |= uint64_t(int(q[i] * conv) + 524287) << shift;
+ shift -= 20;
+ }
+ }
+ }
+ // and write it out
+ Write(packed, off);
+}
+
+void Packet::Payload::Read(glm::quat &val, size_t off) const noexcept {
+ // extract the 8 byte packed value
+ uint64_t packed = 0;
+ Read(packed, off);
+ // two most significant bits are the index of the largest (omitted) component
+ int largest_index = packed >> 62;
+ // if all other three are 0, largest is 1 and we can omit the conversion
+ if ((packed & 0xFFFFFFFFFFFFFFF) == 0x7FFFF7FFFF7FFFF) {
+ val = { 0.0f, 0.0f, 0.0f, 0.0f };
+ val[largest_index] = 1.0f;
+ return;
+ }
+ // we have to map from [-524287,524287] to [-0.7072,0.7072]
+ constexpr float conv = 0.7072f / 524287.0f;
+ int shift = 40;
+ for (int i = 0; i < 4; ++i) {
+ if (i != largest_index) {
+ val[i] = float(int((packed >> shift) & 0xFFFFF) - 524287) * conv;
+ shift -= 20;
+ } else {
+ // set to zero so the length of the other three can be determined
+ val[i] = 0.0f;
+ }
+ }
+ // omitted component squared is 1 - length squared of others
+ val[largest_index] = sqrt(1.0f - glm::length2(val));
+ // and already normalized
+}
+
+void Packet::Payload::Write(const EntityState &state, size_t off) noexcept {
+ Write(state.pos.chunk, off);
+ WritePackU(state.pos.block * (1.0f / ExactLocation::fscale), off + 12);
+ Write(state.velocity, off + 18);
+ Write(state.orient, off + 30);
+ WritePackN(state.pitch * PI_0p5_inv, off + 38);
+ WritePackN(state.yaw * PI_inv, off + 40);
+}
+
+void Packet::Payload::Read(EntityState &state, size_t off) const noexcept {
+ Read(state.pos.chunk, off);
+ ReadPackU(state.pos.block, off + 12);
+ Read(state.velocity, off + 18);
+ Read(state.orient, off + 30);
+ ReadPackN(state.pitch, off + 38);
+ ReadPackN(state.yaw, off + 40);
+ state.pos.block *= ExactLocation::fscale;
+ state.pitch *= PI_0p5;
+ state.yaw *= PI;
+}
+
+void Packet::Payload::Write(const EntityState &state, const glm::ivec3 &base, size_t off) noexcept {
+ WritePackB(state.pos.chunk - base, off);
+ WritePackU(state.pos.block * (1.0f / ExactLocation::fscale), off + 3);
+ Write(state.velocity, off + 9);
+ Write(state.orient, off + 21);
+ WritePackN(state.pitch * PI_0p5_inv, off + 29);
+ WritePackN(state.yaw * PI_inv, off + 31);
+}
+
+void Packet::Payload::Read(EntityState &state, const glm::ivec3 &base, size_t off) const noexcept {
+ ReadPackB(state.pos.chunk, off);
+ ReadPackU(state.pos.block, off + 3);
+ Read(state.velocity, off + 9);
+ Read(state.orient, off + 21);
+ ReadPackN(state.pitch, off + 29);
+ ReadPackN(state.yaw, off + 31);
+ state.pos.chunk += base;
+ state.pos.block *= ExactLocation::fscale;
+ state.pitch *= PI_0p5;
+ state.yaw *= PI;
+}
+
+void Packet::Payload::WritePackB(const glm::ivec3 &val, size_t off) noexcept {
+ Write(int8_t(val.x), off);
+ Write(int8_t(val.y), off + 1);
+ Write(int8_t(val.z), off + 2);
+}
+
+void Packet::Payload::ReadPackB(glm::ivec3 &val, size_t off) const noexcept {
+ int8_t conv = 0;
+ Read(conv, off);
+ val.x = conv;
+ Read(conv, off + 1);
+ val.y = conv;
+ Read(conv, off + 2);
+ val.z = conv;
+}
+
+void Packet::Payload::WritePackN(float val, size_t off) noexcept {
+ int16_t raw = glm::clamp(glm::round(val * 32767.0f), -32767.0f, 32767.0f);
+ Write(raw, off);
+}
+
+void Packet::Payload::ReadPackN(float &val, size_t off) const noexcept {
+ int16_t raw = 0;
+ Read(raw, off);
+ val = raw * (1.0f/32767.0f);
+}
+
+void Packet::Payload::WritePackN(const glm::vec3 &val, size_t off) noexcept {
+ WritePackN(val.x, off);
+ WritePackN(val.y, off + 2);
+ WritePackN(val.z, off + 4);
+}
+
+void Packet::Payload::ReadPackN(glm::vec3 &val, size_t off) const noexcept {
+ ReadPackN(val.x, off);
+ ReadPackN(val.y, off + 2);
+ ReadPackN(val.z, off + 4);
+}
+
+void Packet::Payload::WritePackU(float val, size_t off) noexcept {
+ uint16_t raw = glm::clamp(glm::round(val * 65535.0f), 0.0f, 65535.0f);
+ Write(raw, off);
+}
+
+void Packet::Payload::ReadPackU(float &val, size_t off) const noexcept {
+ uint16_t raw = 0;
+ Read(raw, off);
+ val = raw * (1.0f/65535.0f);
+}
+
+void Packet::Payload::WritePackU(const glm::vec3 &val, size_t off) noexcept {
+ WritePackU(val.x, off);
+ WritePackU(val.y, off + 2);
+ WritePackU(val.z, off + 4);
+}
+
+void Packet::Payload::ReadPackU(glm::vec3 &val, size_t off) const noexcept {
+ ReadPackU(val.x, off);
+ ReadPackU(val.y, off + 2);
+ ReadPackU(val.z, off + 4);
+}
+
void Packet::Login::WritePlayerName(const string &name) noexcept {
WriteString(name, 0, 32);
}
void Packet::Join::WriteWorldName(const string &name) noexcept {
- WriteString(name, 68, 32);
+ WriteString(name, 46, 32);
}
void Packet::Join::ReadWorldName(string &name) const noexcept {
- ReadString(name, 68, 32);
+ ReadString(name, 46, 32);
}
void Packet::PlayerUpdate::WritePredictedState(const EntityState &state) noexcept {
}
void Packet::PlayerUpdate::WriteMovement(const glm::vec3 &mov) noexcept {
- glm::ivec3 conv = clamp(glm::ivec3(mov * 32767.0f), -32767, 32767);
- Write(int16_t(conv.x), 64);
- Write(int16_t(conv.y), 66);
- Write(int16_t(conv.z), 68);
+ WritePackN(mov, 42);
}
void Packet::PlayerUpdate::ReadMovement(glm::vec3 &mov) const noexcept {
- int16_t x, y, z;
- Read(x, 64);
- Read(y, 66);
- Read(z, 68);
- mov = glm::vec3(x, y, z) * .00003051850947599719f;
-}
-
-void Packet::PlayerUpdate::WritePitch(float pitch) noexcept {
- int16_t conv = pitch * 20860.12008116853786870640f;
- Write(conv, 70);
-}
-
-void Packet::PlayerUpdate::ReadPitch(float &pitch) const noexcept {
- int16_t conv = 0;
- Read(conv, 70);
- pitch = conv * .00004793836258415163f;
-}
-
-void Packet::PlayerUpdate::WriteYaw(float yaw) noexcept {
- int16_t conv = yaw * 10430.06004058426893435320f;
- Write(conv, 72);
-}
-
-void Packet::PlayerUpdate::ReadYaw(float &yaw) const noexcept {
- int16_t conv = 0;
- Read(conv, 72);
- yaw = conv * .00009587672516830326f;
+ ReadPackN(mov, 42);
}
void Packet::PlayerUpdate::WriteActions(uint8_t actions) noexcept {
- Write(actions, 74);
+ Write(actions, 48);
}
void Packet::PlayerUpdate::ReadActions(uint8_t &actions) const noexcept {
- Read(actions, 74);
+ Read(actions, 48);
}
void Packet::PlayerUpdate::WriteSlot(uint8_t slot) noexcept {
- Write(slot, 75);
+ Write(slot, 49);
}
void Packet::PlayerUpdate::ReadSlot(uint8_t &slot) const noexcept {
- Read(slot, 75);
+ Read(slot, 49);
}
void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept {
Write(uint32_t(0), 4);
}
Write(e.GetState(), 8);
- Write(e.Bounds(), 72);
+ Write(e.Bounds(), 50);
uint32_t flags = 0;
if (e.WorldCollidable()) {
flags |= 1;
}
- Write(flags, 96);
- WriteString(e.Name(), 100, 32);
+ Write(flags, 74);
+ WriteString(e.Name(), 78, 32);
}
void Packet::SpawnEntity::ReadEntityID(uint32_t &id) const noexcept {
Read(id, 0);
}
-void Packet::SpawnEntity::ReadSkeletonID(uint32_t &id) const noexcept {
+void Packet::SpawnEntity::ReadModelID(uint32_t &id) const noexcept {
Read(id, 4);
}
string name;
Read(state, 8);
- Read(bounds, 72);
- Read(flags, 96);
- ReadString(name, 100, 32);
+ Read(bounds, 50);
+ Read(flags, 74);
+ ReadString(name, 78, 32);
e.SetState(state);
e.Bounds(bounds);
Read(count, 0);
}
-void Packet::EntityUpdate::WriteEntity(const Entity &entity, uint32_t num) noexcept {
+void Packet::EntityUpdate::WriteChunkBase(const glm::ivec3 &base) noexcept {
+ Write(base, 4);
+}
+
+void Packet::EntityUpdate::ReadChunkBase(glm::ivec3 &base) const noexcept {
+ Read(base, 4);
+}
+
+void Packet::EntityUpdate::WriteEntity(const Entity &entity, const glm::ivec3 &base, uint32_t num) noexcept {
uint32_t off = GetSize(num);
Write(entity.ID(), off);
- Write(entity.GetState(), off + 4);
+ Write(entity.GetState(), base, off + 4);
}
void Packet::EntityUpdate::ReadEntityID(uint32_t &id, uint32_t num) const noexcept {
Read(id, off);
}
-void Packet::EntityUpdate::ReadEntityState(EntityState &state, uint32_t num) const noexcept {
+void Packet::EntityUpdate::ReadEntityState(EntityState &state, const glm::ivec3 &base, uint32_t num) const noexcept {
uint32_t off = GetSize(num);
- Read(state, off + 4);
+ Read(state, base, off + 4);
}
void Packet::PlayerCorrection::WritePacketSeq(std::uint16_t s) noexcept {
memcpy(d, &data[12], len);
}
+void Packet::BlockUpdate::WriteChunkCoords(const glm::ivec3 &coords) noexcept {
+ Write(coords, 0);
+}
+
+void Packet::BlockUpdate::ReadChunkCoords(glm::ivec3 &coords) const noexcept {
+ Read(coords, 0);
+}
+
+void Packet::BlockUpdate::WriteBlockCount(uint32_t count) noexcept {
+ Write(count, 12);
+}
+
+void Packet::BlockUpdate::ReadBlockCount(uint32_t &count) const noexcept {
+ Read(count, 12);
+}
+
+void Packet::BlockUpdate::WriteIndex(uint16_t index, uint32_t num) noexcept {
+ uint32_t off = GetSize(num);
+ Write(index, off);
+}
+
+void Packet::BlockUpdate::ReadIndex(uint16_t &index, uint32_t num) const noexcept {
+ uint32_t off = GetSize(num);
+ Read(index, off);
+}
+
+void Packet::BlockUpdate::WriteBlock(const Block &block, uint32_t num) noexcept {
+ uint32_t off = GetSize(num) + 2;
+ Write(block, off);
+}
+
+void Packet::BlockUpdate::ReadBlock(Block &block, uint32_t num) const noexcept {
+ uint32_t off = GetSize(num) + 2;
+ Read(block, off);
+}
+
+void Packet::Message::WriteType(uint8_t type) noexcept {
+ Write(type, 0);
+}
+
+void Packet::Message::ReadType(uint8_t &type) const noexcept {
+ Read(type, 0);
+}
+
+void Packet::Message::WriteReferral(uint32_t ref) noexcept {
+ Write(ref, 1);
+}
+
+void Packet::Message::ReadReferral(uint32_t &ref) const noexcept {
+ Read(ref, 1);
+}
+
+void Packet::Message::WriteMessage(const string &msg) noexcept {
+ WriteString(msg, 5, MAX_MESSAGE_LEN);
+}
+
+void Packet::Message::ReadMessage(string &msg) const noexcept {
+ ReadString(msg, 5, MAX_MESSAGE_LEN);
+}
+
void ConnectionHandler::Handle(const UDPpacket &udp_pack) {
const Packet &pack = *reinterpret_cast<const Packet *>(udp_pack.data);
case Packet::ChunkData::TYPE:
On(Packet::As<Packet::ChunkData>(udp_pack));
break;
+ case Packet::BlockUpdate::TYPE:
+ On(Packet::As<Packet::BlockUpdate>(udp_pack));
+ break;
+ case Packet::Message::TYPE:
+ On(Packet::As<Packet::Message>(udp_pack));
+ break;
default:
// drop unknown or unhandled packets
break;
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