X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fnet%2Fnet.cpp;h=4f7fc66647a2817eb8f87133f4f937e382096097;hb=dcd54cacda98c2c0f7cf0c7a9131fb858d8ee10a;hp=86098f4d4a3e087c6b16f03e0546df6f45bfbf59;hpb=7c5e04a4af82947ae8e26db3d03f13a555c10aba;p=blank.git diff --git a/src/net/net.cpp b/src/net/net.cpp index 86098f4..4f7fc66 100644 --- a/src/net/net.cpp +++ b/src/net/net.cpp @@ -1,9 +1,11 @@ +#include "CongestionControl.hpp" #include "Connection.hpp" #include "ConnectionHandler.hpp" #include "io.hpp" #include "Packet.hpp" #include "../app/init.hpp" +#include "../geometry/const.hpp" #include "../model/Model.hpp" #include "../world/Entity.hpp" #include "../world/EntityState.hpp" @@ -30,10 +32,175 @@ 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 } @@ -84,6 +251,11 @@ uint16_t Connection::Send(UDPpacket &udp_pack, UDPsocket sock) { throw NetError("SDLNet_UDP_Send"); } + if (HasHandler()) { + Handler().PacketOut(udp_pack); + Handler().PacketSent(seq); + } + FlagSend(); return seq; } @@ -111,6 +283,7 @@ void Connection::Received(const UDPpacket &udp_pack) { } Packet::TControl ctrl_new = pack.header.ctrl; + Handler().PacketIn(udp_pack); Handler().Handle(udp_pack); if (diff > 0) { @@ -149,31 +322,30 @@ uint16_t Connection::SendPing(UDPpacket &udp_pack, UDPsocket sock) { 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); } @@ -262,58 +434,110 @@ void Packet::Payload::ReadString(string &dst, size_t off, size_t maxlen) const n } void Packet::Payload::Write(const glm::quat &val, size_t off) noexcept { - WritePackN(val.w, off); - WritePackN(val.x, off + 2); - WritePackN(val.y, off + 4); - WritePackN(val.z, off + 6); + // 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 { - ReadPackN(val.w, off); - ReadPackN(val.x, off + 2); - ReadPackN(val.y, off + 4); - ReadPackN(val.z, off + 6); - val = normalize(val); + // 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.chunk_pos, off); - WritePackU(state.block_pos * (1.0f / 16.0f), off + 12); + 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); - Write(state.ang_vel, off + 38); + 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.chunk_pos, off); - ReadPackU(state.block_pos, off + 12); + Read(state.pos.chunk, off); + ReadPackU(state.pos.block, off + 12); Read(state.velocity, off + 18); Read(state.orient, off + 30); - Read(state.ang_vel, off + 38); - state.block_pos *= 16.0f; + 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.chunk_pos - base, off); - WritePackU(state.block_pos * (1.0f / 16.0f), off + 3); + 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); - Write(state.ang_vel, off + 29); + 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.chunk_pos, off); - ReadPackU(state.block_pos, off + 3); + ReadPackB(state.pos.chunk, off); + ReadPackU(state.pos.block, off + 3); Read(state.velocity, off + 9); Read(state.orient, off + 21); - Read(state.ang_vel, off + 29); - state.chunk_pos += base; - state.block_pos *= 16.0f; -} - -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); + 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 { @@ -332,6 +556,11 @@ void Packet::Payload::ReadPackB(glm::ivec3 &val, size_t off) const noexcept { 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); @@ -396,11 +625,11 @@ void Packet::Join::ReadPlayerState(EntityState &state) const noexcept { } void Packet::Join::WriteWorldName(const string &name) noexcept { - WriteString(name, 54, 32); + WriteString(name, 46, 32); } void Packet::Join::ReadWorldName(string &name) const noexcept { - ReadString(name, 54, 32); + ReadString(name, 46, 32); } void Packet::PlayerUpdate::WritePredictedState(const EntityState &state) noexcept { @@ -412,47 +641,27 @@ void Packet::PlayerUpdate::ReadPredictedState(EntityState &state) const noexcept } void Packet::PlayerUpdate::WriteMovement(const glm::vec3 &mov) noexcept { - WritePackN(mov, 50); + WritePackN(mov, 42); } void Packet::PlayerUpdate::ReadMovement(glm::vec3 &mov) const noexcept { - ReadPackN(mov, 50); -} - -void Packet::PlayerUpdate::WritePitch(float pitch) noexcept { - float conv = pitch * PI_0p5_inv; - WritePackN(conv, 56); -} - -void Packet::PlayerUpdate::ReadPitch(float &pitch) const noexcept { - ReadPackN(pitch, 56); - pitch *= PI_0p5; -} - -void Packet::PlayerUpdate::WriteYaw(float yaw) noexcept { - float conv = yaw * PI_inv; - WritePackN(conv, 58); -} - -void Packet::PlayerUpdate::ReadYaw(float &yaw) const noexcept { - ReadPackN(yaw, 58); - yaw *= PI; + ReadPackN(mov, 42); } void Packet::PlayerUpdate::WriteActions(uint8_t actions) noexcept { - Write(actions, 60); + Write(actions, 48); } void Packet::PlayerUpdate::ReadActions(uint8_t &actions) const noexcept { - Read(actions, 60); + Read(actions, 48); } void Packet::PlayerUpdate::WriteSlot(uint8_t slot) noexcept { - Write(slot, 61); + Write(slot, 49); } void Packet::PlayerUpdate::ReadSlot(uint8_t &slot) const noexcept { - Read(slot, 61); + Read(slot, 49); } void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept { @@ -463,13 +672,13 @@ void Packet::SpawnEntity::WriteEntity(const Entity &e) noexcept { Write(uint32_t(0), 4); } Write(e.GetState(), 8); - Write(e.Bounds(), 58); + Write(e.Bounds(), 50); uint32_t flags = 0; if (e.WorldCollidable()) { flags |= 1; } - Write(flags, 82); - WriteString(e.Name(), 86, 32); + Write(flags, 74); + WriteString(e.Name(), 78, 32); } void Packet::SpawnEntity::ReadEntityID(uint32_t &id) const noexcept { @@ -487,9 +696,9 @@ void Packet::SpawnEntity::ReadEntity(Entity &e) const noexcept { string name; Read(state, 8); - Read(bounds, 58); - Read(flags, 82); - ReadString(name, 86, 32); + Read(bounds, 50); + Read(flags, 74); + ReadString(name, 78, 32); e.SetState(state); e.Bounds(bounds);