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Merge pull request #242 from BernardoGomesNegri/local-mp
Emulated local Wi-Fi multiplayer support (2 players max)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| #include "mp.hpp" | ||
| #include "environment.hpp" | ||
| #include <ctime> | ||
| #include <libretro.h> | ||
| #include <retro_assert.h> | ||
| #include <retro_endianness.h> | ||
| using namespace MelonDsDs; | ||
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| constexpr long RECV_TIMEOUT_MS = 25; | ||
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| uint64_t swapToNetwork(uint64_t n) { | ||
| return swap_if_little64(n); | ||
| } | ||
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| Packet Packet::parsePk(const void *buf, uint64_t len) { | ||
| // Necessary because arithmetic on void* is forbidden | ||
| const char *indexableBuf = (const char *)buf; | ||
| const char *data = indexableBuf + HeaderSize; | ||
| retro_assert(len >= HeaderSize); | ||
| size_t dataLen = len - HeaderSize; | ||
| uint64_t timestamp = swapToNetwork(*(const uint64_t*)(indexableBuf)); | ||
| uint8_t aid = *(const uint8_t*)(indexableBuf + 8); | ||
| uint8_t type = *(const uint8_t*)(indexableBuf + 9); | ||
| // type 2 means cmd frame | ||
| // type 1 means reply frame | ||
| // type 0 means anything else | ||
| retro_assert(type == 2 || type == 1 || type == 0); | ||
| Packet::Type pkType; | ||
| switch (type) { | ||
| case 0: | ||
| pkType = Other; | ||
| break; | ||
| case 1: | ||
| pkType = Reply; | ||
| break; | ||
| case 2: | ||
| pkType = Cmd; | ||
| break; | ||
| } | ||
| return Packet(data, dataLen, timestamp, aid, pkType); | ||
| } | ||
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| Packet::Packet(const void *data, uint64_t len, uint64_t timestamp, uint8_t aid, Packet::Type type) : | ||
| _data((unsigned char*)data, (unsigned char*)data + len), | ||
| _timestamp(timestamp), | ||
| _aid(aid), | ||
| _type(type){ | ||
| } | ||
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| std::vector<uint8_t> Packet::ToBuf() const { | ||
| std::vector<uint8_t> ret; | ||
| ret.reserve(HeaderSize + Length()); | ||
| uint64_t netTimestamp = swapToNetwork(_timestamp); | ||
| ret.insert(ret.end(), (const char *)&netTimestamp, ((const char *)&netTimestamp) + sizeof(uint64_t)); | ||
| ret.push_back(_aid); | ||
| uint8_t numericalType = 0; | ||
| switch(_type) { | ||
| case Other: | ||
| numericalType = 0; | ||
| break; | ||
| case Reply: | ||
| numericalType = 1; | ||
| break; | ||
| case Cmd: | ||
| numericalType = 2; | ||
| break; | ||
| } | ||
| ret.push_back(numericalType); | ||
| ret.insert(ret.end(), _data.begin(), _data.end()); | ||
| return ret; | ||
| } | ||
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| bool MpState::IsReady() const noexcept { | ||
| return _sendFn != nullptr && _pollFn != nullptr; | ||
| } | ||
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| void MpState::SetSendFn(retro_netpacket_send_t sendFn) noexcept { | ||
| _sendFn = sendFn; | ||
| } | ||
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| void MpState::SetPollFn(retro_netpacket_poll_receive_t pollFn) noexcept { | ||
| _pollFn = pollFn; | ||
| } | ||
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| void MpState::PacketReceived(const void *buf, size_t len, uint16_t client_id) noexcept { | ||
| retro_assert(IsReady()); | ||
| Packet p = Packet::parsePk(buf, len); | ||
| if(p.PacketType() == Packet::Type::Cmd) { | ||
| _hostId = client_id; | ||
| //retro::debug("Host client id is {}", client_id); | ||
| } | ||
| receivedPackets.push(std::move(p)); | ||
| } | ||
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| std::optional<Packet> MpState::NextPacket() noexcept { | ||
| retro_assert(IsReady()); | ||
| if(receivedPackets.empty()) { | ||
| _sendFn(RETRO_NETPACKET_FLUSH_HINT, NULL, 0, RETRO_NETPACKET_BROADCAST); | ||
| _pollFn(); | ||
| } | ||
| if(receivedPackets.empty()) { | ||
| return std::nullopt; | ||
| } else { | ||
| Packet p = receivedPackets.front(); | ||
| receivedPackets.pop(); | ||
| return p; | ||
| } | ||
| } | ||
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| std::optional<Packet> MpState::NextPacketBlock() noexcept { | ||
| retro_assert(IsReady()); | ||
| if (receivedPackets.empty()) { | ||
| for(std::clock_t start = std::clock(); std::clock() < (start + (RECV_TIMEOUT_MS * CLOCKS_PER_SEC / 1000));) { | ||
| _sendFn(RETRO_NETPACKET_FLUSH_HINT, NULL, 0, RETRO_NETPACKET_BROADCAST); | ||
| _pollFn(); | ||
| if(!receivedPackets.empty()) { | ||
| return NextPacket(); | ||
| } | ||
| } | ||
| } else { | ||
| return NextPacket(); | ||
| } | ||
| retro::debug("Timeout while waiting for packet"); | ||
| return std::nullopt; | ||
| } | ||
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| void MpState::SendPacket(const Packet &p) noexcept { | ||
| retro_assert(IsReady()); | ||
| uint16_t dest = RETRO_NETPACKET_BROADCAST; | ||
| if(p.PacketType() == Packet::Type::Cmd) { | ||
| _hostId = std::nullopt; | ||
| } | ||
| if(p.PacketType() == Packet::Type::Reply && _hostId.has_value()) { | ||
| dest = _hostId.value(); | ||
| } | ||
| _sendFn(RETRO_NETPACKET_UNSEQUENCED | RETRO_NETPACKET_UNRELIABLE | RETRO_NETPACKET_FLUSH_HINT, p.ToBuf().data(), p.Length() + HeaderSize, dest); | ||
| } | ||
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