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Diffstat (limited to 'core/multiplayer/multiplayer_replicator.cpp')
| -rw-r--r-- | core/multiplayer/multiplayer_replicator.cpp | 788 |
1 files changed, 788 insertions, 0 deletions
diff --git a/core/multiplayer/multiplayer_replicator.cpp b/core/multiplayer/multiplayer_replicator.cpp new file mode 100644 index 0000000000..17af2c5ef8 --- /dev/null +++ b/core/multiplayer/multiplayer_replicator.cpp @@ -0,0 +1,788 @@ +/*************************************************************************/ +/* multiplayer_replicator.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/*************************************************************************/ + +#include "core/multiplayer/multiplayer_replicator.h" + +#include "core/io/marshalls.h" +#include "scene/main/node.h" +#include "scene/resources/packed_scene.h" + +#define MAKE_ROOM(m_amount) \ + if (packet_cache.size() < m_amount) \ + packet_cache.resize(m_amount); + +Error MultiplayerReplicator::_sync_all_default(const ResourceUID::ID &p_scene_id, int p_peer) { + ERR_FAIL_COND_V(!replications.has(p_scene_id), ERR_INVALID_PARAMETER); + SceneConfig &cfg = replications[p_scene_id]; + int full_size = 0; + bool same_size = true; + int last_size = 0; + bool all_raw = true; + struct EncodeInfo { + int size = 0; + bool raw = false; + List<Variant> state; + }; + Map<ObjectID, struct EncodeInfo> state; + if (tracked_objects.has(p_scene_id)) { + for (const ObjectID &obj_id : tracked_objects[p_scene_id]) { + Object *obj = ObjectDB::get_instance(obj_id); + if (obj) { + struct EncodeInfo info; + Error err = _get_state(cfg.sync_properties, obj, info.state); + ERR_CONTINUE(err); + err = _encode_state(info.state, nullptr, info.size, &info.raw); + ERR_CONTINUE(err); + state[obj_id] = info; + full_size += info.size; + if (last_size && info.size != last_size) { + same_size = false; + } + all_raw = all_raw && info.raw; + last_size = info.size; + } + } + } + // Default implementation do not send empty updates. + if (!full_size) { + return OK; + } +#ifdef DEBUG_ENABLED + if (full_size > 4096 && cfg.sync_interval) { + WARN_PRINT_ONCE(vformat("The timed state update for scene %d is big (%d bytes) consider optimizing it", p_scene_id)); + } +#endif + if (same_size) { + // This is fast and small. Should we allow more than 256 objects per type? + // This costs us 1 byte. + MAKE_ROOM(SYNC_CMD_OFFSET + 1 + 2 + 2 + full_size); + } else { + MAKE_ROOM(SYNC_CMD_OFFSET + 1 + 2 + state.size() * 2 + full_size); + } + int ofs = 0; + uint8_t *ptr = packet_cache.ptrw(); + ptr[0] = MultiplayerAPI::NETWORK_COMMAND_SYNC | (same_size ? BYTE_OR_ZERO_FLAG : 0); + ofs = 1; + ofs += encode_uint64(p_scene_id, &ptr[ofs]); + ptr[ofs] = cfg.sync_recv++; + ofs += 1; + ofs += encode_uint16(state.size(), &ptr[ofs]); + if (same_size) { + ofs += encode_uint16(last_size + (all_raw ? 1 << 15 : 0), &ptr[ofs]); + } + for (const ObjectID &obj_id : tracked_objects[p_scene_id]) { + if (!state.has(obj_id)) { + continue; + } + struct EncodeInfo &info = state[obj_id]; + Object *obj = ObjectDB::get_instance(obj_id); + ERR_CONTINUE(!obj); + int size = 0; + if (!same_size) { + // We need to encode the size of every object. + ofs += encode_uint16(info.size + (info.raw ? 1 << 15 : 0), &ptr[ofs]); + } + Error err = _encode_state(info.state, &ptr[ofs], size, &info.raw); + ERR_CONTINUE(err); + ofs += size; + } + Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer(); + peer->set_target_peer(p_peer); + peer->set_transfer_channel(0); + peer->set_transfer_mode(Multiplayer::TRANSFER_MODE_UNRELIABLE); + return peer->put_packet(ptr, ofs); +} + +void MultiplayerReplicator::_process_default_sync(const ResourceUID::ID &p_id, const uint8_t *p_packet, int p_packet_len) { + ERR_FAIL_COND_MSG(p_packet_len < SYNC_CMD_OFFSET + 5, "Invalid spawn packet received"); + ERR_FAIL_COND_MSG(!replications.has(p_id), "Invalid spawn ID received " + itos(p_id)); + SceneConfig &cfg = replications[p_id]; + ERR_FAIL_COND_MSG(cfg.mode != REPLICATION_MODE_SERVER || multiplayer->is_server(), "The defualt implementation only allows sync packets from the server"); + const bool same_size = p_packet[0] & BYTE_OR_ZERO_FLAG; + int ofs = SYNC_CMD_OFFSET; + int time = p_packet[ofs]; + // Skip old update. + if (time < cfg.sync_recv && cfg.sync_recv - time < 127) { + return; + } + cfg.sync_recv = time; + ofs += 1; + int count = decode_uint16(&p_packet[ofs]); + ofs += 2; +#ifdef DEBUG_ENABLED + ERR_FAIL_COND(!tracked_objects.has(p_id) || tracked_objects[p_id].size() != count); +#else + if (!tracked_objects.has(p_id) || tracked_objects[p_id].size() != count) { + return; + } +#endif + int data_size = 0; + bool raw = false; + if (same_size) { + // This is fast and optimized. + data_size = decode_uint16(&p_packet[ofs]); + raw = (data_size & (1 << 15)) != 0; + data_size = data_size & ~(1 << 15); + ofs += 2; + ERR_FAIL_COND(p_packet_len - ofs < data_size * count); + } + for (const ObjectID &obj_id : tracked_objects[p_id]) { + Object *obj = ObjectDB::get_instance(obj_id); + ERR_CONTINUE(!obj); + if (!same_size) { + // This is slow and wasteful. + data_size = decode_uint16(&p_packet[ofs]); + raw = (data_size & (1 << 15)) != 0; + data_size = data_size & ~(1 << 15); + ofs += 2; + ERR_FAIL_COND(p_packet_len - ofs < data_size); + } + int size = 0; + Error err = _decode_state(cfg.sync_properties, obj, &p_packet[ofs], data_size, size, raw); + ofs += data_size; + ERR_CONTINUE(err); + ERR_CONTINUE(size != data_size); + } +} + +Error MultiplayerReplicator::_send_default_spawn_despawn(int p_peer_id, const ResourceUID::ID &p_scene_id, Object *p_obj, const NodePath &p_path, bool p_spawn) { + ERR_FAIL_COND_V(p_spawn && !p_obj, ERR_INVALID_PARAMETER); + ERR_FAIL_COND_V(!replications.has(p_scene_id), ERR_INVALID_PARAMETER); + Error err; + // Prepare state + List<Variant> state_variants; + int state_len = 0; + const SceneConfig &cfg = replications[p_scene_id]; + if (p_spawn) { + if ((err = _get_state(cfg.properties, p_obj, state_variants)) != OK) { + return err; + } + } + + bool is_raw = false; + if (state_variants.size() == 1 && state_variants[0].get_type() == Variant::PACKED_BYTE_ARRAY) { + is_raw = true; + const PackedByteArray pba = state_variants[0]; + state_len = pba.size(); + } else if (state_variants.size()) { + err = _encode_state(state_variants, nullptr, state_len); + ERR_FAIL_COND_V(err, err); + } else { + is_raw = true; + } + + int ofs = 0; + + // Prepare simplified path + const Node *root_node = multiplayer->get_root_node(); + ERR_FAIL_COND_V(!root_node, ERR_UNCONFIGURED); + NodePath rel_path = (root_node->get_path()).rel_path_to(p_path); + const Vector<StringName> names = rel_path.get_names(); + ERR_FAIL_COND_V(names.size() < 2, ERR_INVALID_PARAMETER); + + NodePath parent = NodePath(names.subarray(0, names.size() - 2), false); + ERR_FAIL_COND_V_MSG(!root_node->has_node(parent), ERR_INVALID_PARAMETER, "Path not found: " + parent); + + int path_id = 0; + multiplayer->send_confirm_path(root_node->get_node(parent), parent, p_peer_id, path_id); + + // Encode name and parent ID. + CharString cname = String(names[names.size() - 1]).utf8(); + int nlen = encode_cstring(cname.get_data(), nullptr); + MAKE_ROOM(SPAWN_CMD_OFFSET + 4 + 4 + nlen + state_len); + uint8_t *ptr = packet_cache.ptrw(); + ptr[0] = (p_spawn ? MultiplayerAPI::NETWORK_COMMAND_SPAWN : MultiplayerAPI::NETWORK_COMMAND_DESPAWN) | (is_raw ? BYTE_OR_ZERO_FLAG : 0); + ofs = 1; + ofs += encode_uint64(p_scene_id, &ptr[ofs]); + ofs += encode_uint32(path_id, &ptr[ofs]); + ofs += encode_uint32(nlen, &ptr[ofs]); + ofs += encode_cstring(cname.get_data(), &ptr[ofs]); + + // Encode state. + if (!is_raw) { + _encode_state(state_variants, &ptr[ofs], state_len); + } else if (state_len) { + PackedByteArray pba = state_variants[0]; + memcpy(&ptr[ofs], pba.ptr(), state_len); + } + + Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer(); + peer->set_target_peer(p_peer_id); + peer->set_transfer_channel(0); + peer->set_transfer_mode(Multiplayer::TRANSFER_MODE_RELIABLE); + return peer->put_packet(ptr, ofs + state_len); +} + +void MultiplayerReplicator::_process_default_spawn_despawn(int p_from, const ResourceUID::ID &p_scene_id, const uint8_t *p_packet, int p_packet_len, bool p_spawn) { + ERR_FAIL_COND_MSG(p_packet_len < SPAWN_CMD_OFFSET + 9, "Invalid spawn packet received"); + int ofs = SPAWN_CMD_OFFSET; + uint32_t node_target = decode_uint32(&p_packet[ofs]); + Node *parent = multiplayer->get_cached_node(p_from, node_target); + ofs += 4; + ERR_FAIL_COND_MSG(parent == nullptr, "Invalid packet received. Requested node was not found."); + + uint32_t name_len = decode_uint32(&p_packet[ofs]); + ofs += 4; + ERR_FAIL_COND_MSG(name_len > uint32_t(p_packet_len - ofs), vformat("Invalid spawn packet size: %d, wants: %d", p_packet_len, ofs + name_len)); + ERR_FAIL_COND_MSG(name_len < 1, "Zero spawn name size."); + + const String name = String::utf8((const char *)&p_packet[ofs], name_len); + // We need to make sure no trickery happens here (e.g. despawning a subpath), but we want to allow autogenerated ("@") node names. + ERR_FAIL_COND_MSG(name.validate_node_name() != name.replace("@", ""), vformat("Invalid node name received: '%s'", name)); + ofs += name_len; + + const SceneConfig &cfg = replications[p_scene_id]; + if (cfg.mode == REPLICATION_MODE_SERVER && p_from == 1) { + String scene_path = ResourceUID::get_singleton()->get_id_path(p_scene_id); + if (p_spawn) { + const bool is_raw = ((p_packet[0] & BYTE_OR_ZERO_FLAG) >> BYTE_OR_ZERO_SHIFT) == 1; + + ERR_FAIL_COND_MSG(parent->has_node(name), vformat("Unable to spawn node. Node already exists: %s/%s", parent->get_path(), name)); + RES res = ResourceLoader::load(scene_path); + ERR_FAIL_COND_MSG(!res.is_valid(), "Unable to load scene to spawn at path: " + scene_path); + PackedScene *scene = Object::cast_to<PackedScene>(res.ptr()); + ERR_FAIL_COND(!scene); + Node *node = scene->instantiate(); + ERR_FAIL_COND(!node); + replicated_nodes[node->get_instance_id()] = p_scene_id; + _track(p_scene_id, node); + int size; + _decode_state(cfg.properties, node, &p_packet[ofs], p_packet_len - ofs, size, is_raw); + parent->_add_child_nocheck(node, name); + emit_signal(SNAME("spawned"), p_scene_id, node); + } else { + ERR_FAIL_COND_MSG(!parent->has_node(name), vformat("Path not found: %s/%s", parent->get_path(), name)); + Node *node = parent->get_node(name); + ERR_FAIL_COND_MSG(!replicated_nodes.has(node->get_instance_id()), vformat("Trying to despawn a Node that was not replicated: %s/%s", parent->get_path(), name)); + emit_signal(SNAME("despawned"), p_scene_id, node); + _untrack(p_scene_id, node); + replicated_nodes.erase(node->get_instance_id()); + node->queue_delete(); + } + } else { + PackedByteArray data; + if (p_packet_len > ofs) { + data.resize(p_packet_len - ofs); + memcpy(data.ptrw(), &p_packet[ofs], data.size()); + } + if (p_spawn) { + emit_signal(SNAME("spawn_requested"), p_from, p_scene_id, parent, name, data); + } else { + emit_signal(SNAME("despawn_requested"), p_from, p_scene_id, parent, name, data); + } + } +} + +void MultiplayerReplicator::process_spawn_despawn(int p_from, const uint8_t *p_packet, int p_packet_len, bool p_spawn) { + ERR_FAIL_COND_MSG(p_packet_len < SPAWN_CMD_OFFSET, "Invalid spawn packet received"); + ResourceUID::ID id = decode_uint64(&p_packet[1]); + ERR_FAIL_COND_MSG(!replications.has(id), "Invalid spawn ID received " + itos(id)); + + const SceneConfig &cfg = replications[id]; + if (cfg.on_spawn_despawn_receive.is_valid()) { + int ofs = SPAWN_CMD_OFFSET; + bool is_raw = ((p_packet[0] & BYTE_OR_ZERO_FLAG) >> BYTE_OR_ZERO_SHIFT) == 1; + Variant data; + int left = p_packet_len - ofs; + if (is_raw && left) { + PackedByteArray pba; + pba.resize(left); + memcpy(pba.ptrw(), &p_packet[ofs], pba.size()); + data = pba; + } else if (left) { + ERR_FAIL_COND(decode_variant(data, &p_packet[ofs], left) != OK); + } + + Variant args[4]; + args[0] = p_from; + args[1] = id; + args[2] = data; + args[3] = p_spawn; + const Variant *argp[] = { &args[0], &args[1], &args[2], &args[3] }; + Callable::CallError ce; + Variant ret; + cfg.on_spawn_despawn_receive.call(argp, 4, ret, ce); + ERR_FAIL_COND_MSG(ce.error != Callable::CallError::CALL_OK, "Custom receive function failed"); + } else { + _process_default_spawn_despawn(p_from, id, p_packet, p_packet_len, p_spawn); + } +} + +void MultiplayerReplicator::process_sync(int p_from, const uint8_t *p_packet, int p_packet_len) { + ERR_FAIL_COND_MSG(p_packet_len < SPAWN_CMD_OFFSET, "Invalid spawn packet received"); + ResourceUID::ID id = decode_uint64(&p_packet[1]); + ERR_FAIL_COND_MSG(!replications.has(id), "Invalid spawn ID received " + itos(id)); + const SceneConfig &cfg = replications[id]; + if (cfg.on_sync_receive.is_valid()) { + Array objs; + if (tracked_objects.has(id)) { + objs.resize(tracked_objects[id].size()); + int idx = 0; + for (const ObjectID &obj_id : tracked_objects[id]) { + objs[idx++] = ObjectDB::get_instance(obj_id); + } + } + PackedByteArray pba; + pba.resize(p_packet_len - SPAWN_CMD_OFFSET); + if (pba.size()) { + memcpy(pba.ptrw(), p_packet, p_packet_len - SPAWN_CMD_OFFSET); + } + Variant args[4] = { p_from, id, objs, pba }; + Variant *argp[4] = { args, &args[1], &args[2], &args[3] }; + Callable::CallError ce; + Variant ret; + cfg.on_sync_receive.call((const Variant **)argp, 4, ret, ce); + ERR_FAIL_COND_MSG(ce.error != Callable::CallError::CALL_OK, "Custom sync function failed"); + } else { + ERR_FAIL_COND_MSG(p_from != 1, "Default sync implementation only allow syncing from server to client"); + _process_default_sync(id, p_packet, p_packet_len); + } +} + +Error MultiplayerReplicator::_get_state(const List<StringName> &p_properties, const Object *p_obj, List<Variant> &r_variant) { + ERR_FAIL_COND_V_MSG(!p_obj, ERR_INVALID_PARAMETER, "Cannot encode null object"); + for (const StringName &prop : p_properties) { + bool valid = false; + const Variant v = p_obj->get(prop, &valid); + ERR_FAIL_COND_V_MSG(!valid, ERR_INVALID_DATA, vformat("Property '%s' not found.", prop)); + r_variant.push_back(v); + } + return OK; +} + +Error MultiplayerReplicator::_encode_state(const List<Variant> &p_variants, uint8_t *p_buffer, int &r_len, bool *r_raw) { + r_len = 0; + int size = 0; + + // Try raw encoding optimization. + if (r_raw && p_variants.size() == 1) { + *r_raw = false; + const Variant v = p_variants[0]; + if (v.get_type() == Variant::PACKED_BYTE_ARRAY) { + *r_raw = true; + const PackedByteArray pba = v; + if (p_buffer) { + memcpy(p_buffer, pba.ptr(), pba.size()); + } + r_len += pba.size(); + } else { + multiplayer->encode_and_compress_variant(v, p_buffer, size); + r_len += size; + } + return OK; + } + + // Regular encoding. + for (const Variant &v : p_variants) { + multiplayer->encode_and_compress_variant(v, p_buffer ? p_buffer + r_len : nullptr, size); + r_len += size; + } + return OK; +} + +Error MultiplayerReplicator::_decode_state(const List<StringName> &p_properties, Object *p_obj, const uint8_t *p_buffer, int p_len, int &r_len, bool p_raw) { + r_len = 0; + int argc = p_properties.size(); + if (argc == 0 && p_raw) { + ERR_FAIL_COND_V_MSG(p_len != 0, ERR_INVALID_DATA, "Buffer has trailing bytes."); + return OK; + } + ERR_FAIL_COND_V(p_raw && argc != 1, ERR_INVALID_DATA); + if (p_raw) { + r_len = p_len; + PackedByteArray pba; + pba.resize(p_len); + memcpy(pba.ptrw(), p_buffer, p_len); + p_obj->set(p_properties[0], pba); + return OK; + } + + Vector<Variant> args; + Vector<const Variant *> argp; + args.resize(argc); + + for (int i = 0; i < argc; i++) { + ERR_FAIL_COND_V_MSG(r_len >= p_len, ERR_INVALID_DATA, "Invalid packet received. Size too small."); + + int vlen; + Error err = multiplayer->decode_and_decompress_variant(args.write[i], &p_buffer[r_len], p_len - r_len, &vlen); + ERR_FAIL_COND_V_MSG(err != OK, err, "Invalid packet received. Unable to decode state variable."); + r_len += vlen; + } + ERR_FAIL_COND_V_MSG(p_len - r_len != 0, ERR_INVALID_DATA, "Buffer has trailing bytes."); + + int i = 0; + for (const StringName &prop : p_properties) { + p_obj->set(prop, args[i]); + i += 1; + } + return OK; +} + +Error MultiplayerReplicator::spawn_config(const ResourceUID::ID &p_id, ReplicationMode p_mode, const TypedArray<StringName> &p_props, const Callable &p_on_send, const Callable &p_on_recv) { + ERR_FAIL_COND_V(p_mode < REPLICATION_MODE_NONE || p_mode > REPLICATION_MODE_CUSTOM, ERR_INVALID_PARAMETER); + ERR_FAIL_COND_V(!ResourceUID::get_singleton()->has_id(p_id), ERR_INVALID_PARAMETER); + ERR_FAIL_COND_V_MSG(p_on_send.is_valid() != p_on_recv.is_valid(), ERR_INVALID_PARAMETER, "Send and receive custom callables must be both valid or both empty"); +#ifdef TOOLS_ENABLED + if (!p_on_send.is_valid()) { + // We allow non scene spawning with custom callables. + String path = ResourceUID::get_singleton()->get_id_path(p_id); + RES res = ResourceLoader::load(path); + ERR_FAIL_COND_V(!res->is_class("PackedScene"), ERR_INVALID_PARAMETER); + } +#endif + if (p_mode == REPLICATION_MODE_NONE) { + if (replications.has(p_id)) { + replications.erase(p_id); + } + } else { + SceneConfig cfg; + cfg.mode = p_mode; + for (int i = 0; i < p_props.size(); i++) { + cfg.properties.push_back(p_props[i]); + } + cfg.on_spawn_despawn_send = p_on_send; + cfg.on_spawn_despawn_receive = p_on_recv; + replications[p_id] = cfg; + } + return OK; +} + +Error MultiplayerReplicator::sync_config(const ResourceUID::ID &p_id, uint64_t p_interval, const TypedArray<StringName> &p_props, const Callable &p_on_send, const Callable &p_on_recv) { + ERR_FAIL_COND_V(!ResourceUID::get_singleton()->has_id(p_id), ERR_INVALID_PARAMETER); + ERR_FAIL_COND_V_MSG(p_on_send.is_valid() != p_on_recv.is_valid(), ERR_INVALID_PARAMETER, "Send and receive custom callables must be both valid or both empty"); + ERR_FAIL_COND_V(!replications.has(p_id), ERR_UNCONFIGURED); + SceneConfig &cfg = replications[p_id]; + ERR_FAIL_COND_V_MSG(p_interval && cfg.mode != REPLICATION_MODE_SERVER && !p_on_send.is_valid(), ERR_INVALID_PARAMETER, "Timed updates in custom mode are only allowed if custom callbacks are also specified"); + for (int i = 0; i < p_props.size(); i++) { + cfg.sync_properties.push_back(p_props[i]); + } + cfg.on_sync_send = p_on_send; + cfg.on_sync_receive = p_on_recv; + cfg.sync_interval = p_interval * 1000; + return OK; +} + +Error MultiplayerReplicator::_send_spawn_despawn(int p_peer_id, const ResourceUID::ID &p_scene_id, const Variant &p_data, bool p_spawn) { + int data_size = 0; + int is_raw = false; + if (p_data.get_type() == Variant::PACKED_BYTE_ARRAY) { + const PackedByteArray pba = p_data; + is_raw = true; + data_size = p_data.operator PackedByteArray().size(); + } else if (p_data.get_type() == Variant::NIL) { + is_raw = true; + } else { + Error err = encode_variant(p_data, nullptr, data_size); + ERR_FAIL_COND_V(err, err); + } + MAKE_ROOM(SPAWN_CMD_OFFSET + data_size); + uint8_t *ptr = packet_cache.ptrw(); + ptr[0] = (p_spawn ? MultiplayerAPI::NETWORK_COMMAND_SPAWN : MultiplayerAPI::NETWORK_COMMAND_DESPAWN) + ((is_raw ? 1 : 0) << BYTE_OR_ZERO_SHIFT); + encode_uint64(p_scene_id, &ptr[1]); + if (p_data.get_type() == Variant::PACKED_BYTE_ARRAY) { + const PackedByteArray pba = p_data; + memcpy(&ptr[SPAWN_CMD_OFFSET], pba.ptr(), pba.size()); + } else if (data_size) { + encode_variant(p_data, &ptr[SPAWN_CMD_OFFSET], data_size); + } + Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer(); + peer->set_target_peer(p_peer_id); + peer->set_transfer_channel(0); + peer->set_transfer_mode(Multiplayer::TRANSFER_MODE_RELIABLE); + return peer->put_packet(ptr, SPAWN_CMD_OFFSET + data_size); +} + +Error MultiplayerReplicator::send_despawn(int p_peer_id, const ResourceUID::ID &p_scene_id, const Variant &p_data, const NodePath &p_path) { + ERR_FAIL_COND_V(!multiplayer->has_multiplayer_peer(), ERR_UNCONFIGURED); + ERR_FAIL_COND_V_MSG(!replications.has(p_scene_id), ERR_INVALID_PARAMETER, vformat("Spawnable not found: %d", p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + if (cfg.on_spawn_despawn_send.is_valid()) { + return _send_spawn_despawn(p_peer_id, p_scene_id, p_data, true); + } else { + ERR_FAIL_COND_V_MSG(cfg.mode == REPLICATION_MODE_SERVER && multiplayer->is_server(), ERR_UNAVAILABLE, "Manual despawn is restricted in default server mode implementation. Use custom mode if you desire control over server spawn requests."); + NodePath path = p_path; + Object *obj = p_data.get_type() == Variant::OBJECT ? p_data.get_validated_object() : nullptr; + if (path.is_empty() && obj) { + Node *node = Object::cast_to<Node>(obj); + if (node && node->is_inside_tree()) { + path = node->get_path(); + } + } + ERR_FAIL_COND_V_MSG(path.is_empty(), ERR_INVALID_PARAMETER, "Despawn default implementation requires a despawn path, or the data to be a node inside the SceneTree"); + return _send_default_spawn_despawn(p_peer_id, p_scene_id, obj, path, false); + } +} + +Error MultiplayerReplicator::send_spawn(int p_peer_id, const ResourceUID::ID &p_scene_id, const Variant &p_data, const NodePath &p_path) { + ERR_FAIL_COND_V(!multiplayer->has_multiplayer_peer(), ERR_UNCONFIGURED); + ERR_FAIL_COND_V_MSG(!replications.has(p_scene_id), ERR_INVALID_PARAMETER, vformat("Spawnable not found: %d", p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + if (cfg.on_spawn_despawn_send.is_valid()) { + return _send_spawn_despawn(p_peer_id, p_scene_id, p_data, false); + } else { + ERR_FAIL_COND_V_MSG(cfg.mode == REPLICATION_MODE_SERVER && multiplayer->is_server(), ERR_UNAVAILABLE, "Manual spawn is restricted in default server mode implementation. Use custom mode if you desire control over server spawn requests."); + NodePath path = p_path; + Object *obj = p_data.get_type() == Variant::OBJECT ? p_data.get_validated_object() : nullptr; + ERR_FAIL_COND_V_MSG(!obj, ERR_INVALID_PARAMETER, "Spawn default implementation requires the data to be an object."); + if (path.is_empty()) { + Node *node = Object::cast_to<Node>(obj); + if (node && node->is_inside_tree()) { + path = node->get_path(); + } + } + ERR_FAIL_COND_V_MSG(path.is_empty(), ERR_INVALID_PARAMETER, "Spawn default implementation requires a spawn path, or the data to be a node inside the SceneTree"); + return _send_default_spawn_despawn(p_peer_id, p_scene_id, obj, path, true); + } +} + +Error MultiplayerReplicator::_spawn_despawn(ResourceUID::ID p_scene_id, Object *p_obj, int p_peer, bool p_spawn) { + ERR_FAIL_COND_V_MSG(!replications.has(p_scene_id), ERR_INVALID_PARAMETER, vformat("Spawnable not found: %d", p_scene_id)); + + const SceneConfig &cfg = replications[p_scene_id]; + if (cfg.on_spawn_despawn_send.is_valid()) { + Variant args[4]; + args[0] = p_peer; + args[1] = p_scene_id; + args[2] = p_obj; + args[3] = true; + const Variant *argp[] = { &args[0], &args[1], &args[2], &args[3] }; + Callable::CallError ce; + Variant ret; + cfg.on_spawn_despawn_send.call(argp, 4, ret, ce); + ERR_FAIL_COND_V_MSG(ce.error != Callable::CallError::CALL_OK, FAILED, "Custom send function failed"); + return OK; + } else { + Node *node = Object::cast_to<Node>(p_obj); + ERR_FAIL_COND_V_MSG(!p_obj, ERR_INVALID_PARAMETER, "Only nodes can be replicated by the default implementation"); + return _send_default_spawn_despawn(p_peer, p_scene_id, node, node->get_path(), p_spawn); + } +} + +Error MultiplayerReplicator::spawn(ResourceUID::ID p_scene_id, Object *p_obj, int p_peer) { + return _spawn_despawn(p_scene_id, p_obj, p_peer, true); +} + +Error MultiplayerReplicator::despawn(ResourceUID::ID p_scene_id, Object *p_obj, int p_peer) { + return _spawn_despawn(p_scene_id, p_obj, p_peer, false); +} + +PackedByteArray MultiplayerReplicator::encode_state(const ResourceUID::ID &p_scene_id, const Object *p_obj, bool p_initial) { + PackedByteArray state; + ERR_FAIL_COND_V_MSG(!replications.has(p_scene_id), state, vformat("Spawnable not found: %d", p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + int len = 0; + List<Variant> state_vars; + const List<StringName> props = p_initial ? cfg.properties : cfg.sync_properties; + Error err = _get_state(props, p_obj, state_vars); + ERR_FAIL_COND_V_MSG(err != OK, state, "Unable to retrieve object state."); + err = _encode_state(state_vars, nullptr, len); + ERR_FAIL_COND_V_MSG(err != OK, state, "Unable to encode object state."); + state.resize(len); + _encode_state(state_vars, state.ptrw(), len); + return state; +} + +Error MultiplayerReplicator::decode_state(const ResourceUID::ID &p_scene_id, Object *p_obj, const PackedByteArray p_data, bool p_initial) { + ERR_FAIL_COND_V_MSG(!replications.has(p_scene_id), ERR_INVALID_PARAMETER, vformat("Spawnable not found: %d", p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + const List<StringName> props = p_initial ? cfg.properties : cfg.sync_properties; + int size; + return _decode_state(props, p_obj, p_data.ptr(), p_data.size(), size); +} + +void MultiplayerReplicator::scene_enter_exit_notify(const String &p_scene, Node *p_node, bool p_enter) { + if (!multiplayer->has_multiplayer_peer()) { + return; + } + Node *root_node = multiplayer->get_root_node(); + ERR_FAIL_COND(!p_node || !p_node->get_parent() || !root_node); + NodePath path = (root_node->get_path()).rel_path_to(p_node->get_parent()->get_path()); + if (path.is_empty()) { + return; + } + ResourceUID::ID id = ResourceLoader::get_resource_uid(p_scene); + if (!replications.has(id)) { + return; + } + const SceneConfig &cfg = replications[id]; + if (p_enter) { + if (cfg.mode == REPLICATION_MODE_SERVER && multiplayer->is_server()) { + replicated_nodes[p_node->get_instance_id()] = id; + _track(id, p_node); + spawn(id, p_node, 0); + } + emit_signal(SNAME("replicated_instance_added"), id, p_node); + } else { + if (cfg.mode == REPLICATION_MODE_SERVER && multiplayer->is_server() && replicated_nodes.has(p_node->get_instance_id())) { + replicated_nodes.erase(p_node->get_instance_id()); + _untrack(id, p_node); + despawn(id, p_node, 0); + } + emit_signal(SNAME("replicated_instance_removed"), id, p_node); + } +} + +void MultiplayerReplicator::spawn_all(int p_peer) { + for (const KeyValue<ObjectID, ResourceUID::ID> &E : replicated_nodes) { + // Only server mode adds to replicated_nodes, no need to check it. + Object *obj = ObjectDB::get_instance(E.key); + ERR_CONTINUE(!obj); + Node *node = Object::cast_to<Node>(obj); + ERR_CONTINUE(!node); + spawn(E.value, node, p_peer); + } +} + +void MultiplayerReplicator::poll() { + for (KeyValue<ResourceUID::ID, SceneConfig> &E : replications) { + if (!E.value.sync_interval) { + continue; + } + if (E.value.mode == REPLICATION_MODE_SERVER && !multiplayer->is_server()) { + continue; + } + uint64_t time = OS::get_singleton()->get_ticks_usec(); + if (E.value.sync_last + E.value.sync_interval <= time) { + sync_all(E.key, 0); + E.value.sync_last = time; + } + // Handle wrapping. + if (E.value.sync_last > time) { + E.value.sync_last = time; + } + } +} + +void MultiplayerReplicator::track(const ResourceUID::ID &p_scene_id, Object *p_obj) { + ERR_FAIL_COND(!replications.has(p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + ERR_FAIL_COND_MSG(cfg.mode == REPLICATION_MODE_SERVER, "Manual object tracking is not allowed in server mode."); + _track(p_scene_id, p_obj); +} + +void MultiplayerReplicator::_track(const ResourceUID::ID &p_scene_id, Object *p_obj) { + ERR_FAIL_COND(!p_obj); + ERR_FAIL_COND(!replications.has(p_scene_id)); + if (!tracked_objects.has(p_scene_id)) { + tracked_objects[p_scene_id] = List<ObjectID>(); + } + tracked_objects[p_scene_id].push_back(p_obj->get_instance_id()); +} + +void MultiplayerReplicator::untrack(const ResourceUID::ID &p_scene_id, Object *p_obj) { + ERR_FAIL_COND(!replications.has(p_scene_id)); + const SceneConfig &cfg = replications[p_scene_id]; + ERR_FAIL_COND_MSG(cfg.mode == REPLICATION_MODE_SERVER, "Manual object tracking is not allowed in server mode."); + _untrack(p_scene_id, p_obj); +} + +void MultiplayerReplicator::_untrack(const ResourceUID::ID &p_scene_id, Object *p_obj) { + ERR_FAIL_COND(!p_obj); + ERR_FAIL_COND(!replications.has(p_scene_id)); + if (tracked_objects.has(p_scene_id)) { + tracked_objects[p_scene_id].erase(p_obj->get_instance_id()); + } +} + +Error MultiplayerReplicator::sync_all(const ResourceUID::ID &p_scene_id, int p_peer) { + ERR_FAIL_COND_V(!replications.has(p_scene_id), ERR_INVALID_PARAMETER); + if (!tracked_objects.has(p_scene_id)) { + return OK; + } + const SceneConfig &cfg = replications[p_scene_id]; + if (cfg.on_sync_send.is_valid()) { + Array objs; + if (tracked_objects.has(p_scene_id)) { + objs.resize(tracked_objects[p_scene_id].size()); + int idx = 0; + for (const ObjectID &obj_id : tracked_objects[p_scene_id]) { + objs[idx++] = ObjectDB::get_instance(obj_id); + } + } + Variant args[3] = { p_scene_id, objs, p_peer }; + Variant *argp[3] = { args, &args[1], &args[2] }; + Callable::CallError ce; + Variant ret; + cfg.on_sync_send.call((const Variant **)argp, 3, ret, ce); + ERR_FAIL_COND_V_MSG(ce.error != Callable::CallError::CALL_OK, FAILED, "Custom sync function failed"); + return OK; + } else if (cfg.sync_properties.size()) { + return _sync_all_default(p_scene_id, p_peer); + } + return OK; +} + +Error MultiplayerReplicator::send_sync(int p_peer_id, const ResourceUID::ID &p_scene_id, PackedByteArray p_data, Multiplayer::TransferMode p_transfer_mode, int p_channel) { + ERR_FAIL_COND_V(!multiplayer->has_multiplayer_peer(), ERR_UNCONFIGURED); + ERR_FAIL_COND_V(!replications.has(p_scene_id), ERR_INVALID_PARAMETER); + const SceneConfig &cfg = replications[p_scene_id]; + ERR_FAIL_COND_V_MSG(!cfg.on_sync_send.is_valid(), ERR_UNCONFIGURED, "Sending raw sync messages is only available with custom functions"); + MAKE_ROOM(SYNC_CMD_OFFSET + p_data.size()); + uint8_t *ptr = packet_cache.ptrw(); + ptr[0] = MultiplayerAPI::NETWORK_COMMAND_SYNC; + encode_uint64(p_scene_id, &ptr[1]); + Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer(); + peer->set_target_peer(p_peer_id); + peer->set_transfer_channel(p_channel); + peer->set_transfer_mode(p_transfer_mode); + return peer->put_packet(ptr, SYNC_CMD_OFFSET + p_data.size()); +} + +void MultiplayerReplicator::clear() { + tracked_objects.clear(); + replicated_nodes.clear(); +} + +void MultiplayerReplicator::_bind_methods() { + ClassDB::bind_method(D_METHOD("spawn_config", "scene_id", "spawn_mode", "properties", "custom_send", "custom_receive"), &MultiplayerReplicator::spawn_config, DEFVAL(TypedArray<StringName>()), DEFVAL(Callable()), DEFVAL(Callable())); + ClassDB::bind_method(D_METHOD("sync_config", "scene_id", "interval", "properties", "custom_send", "custom_receive"), &MultiplayerReplicator::sync_config, DEFVAL(TypedArray<StringName>()), DEFVAL(Callable()), DEFVAL(Callable())); + ClassDB::bind_method(D_METHOD("despawn", "scene_id", "object", "peer_id"), &MultiplayerReplicator::despawn, DEFVAL(0)); + ClassDB::bind_method(D_METHOD("spawn", "scene_id", "object", "peer_id"), &MultiplayerReplicator::spawn, DEFVAL(0)); + ClassDB::bind_method(D_METHOD("send_despawn", "peer_id", "scene_id", "data", "path"), &MultiplayerReplicator::send_despawn, DEFVAL(Variant()), DEFVAL(NodePath())); + ClassDB::bind_method(D_METHOD("send_spawn", "peer_id", "scene_id", "data", "path"), &MultiplayerReplicator::send_spawn, DEFVAL(Variant()), DEFVAL(NodePath())); + ClassDB::bind_method(D_METHOD("send_sync", "peer_id", "scene_id", "data", "transfer_mode", "channel"), &MultiplayerReplicator::send_sync, DEFVAL(Multiplayer::TRANSFER_MODE_RELIABLE), DEFVAL(0)); + ClassDB::bind_method(D_METHOD("sync_all", "scene_id", "peer_id"), &MultiplayerReplicator::sync_all, DEFVAL(0)); + ClassDB::bind_method(D_METHOD("track", "scene_id", "object"), &MultiplayerReplicator::track); + ClassDB::bind_method(D_METHOD("untrack", "scene_id", "object"), &MultiplayerReplicator::untrack); + ClassDB::bind_method(D_METHOD("encode_state", "scene_id", "object", "initial"), &MultiplayerReplicator::encode_state, DEFVAL(true)); + ClassDB::bind_method(D_METHOD("decode_state", "scene_id", "object", "data", "initial"), &MultiplayerReplicator::decode_state, DEFVAL(true)); + + ADD_SIGNAL(MethodInfo("despawned", PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node"))); + ADD_SIGNAL(MethodInfo("spawned", PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node"))); + ADD_SIGNAL(MethodInfo("despawn_requested", PropertyInfo(Variant::INT, "id"), PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "parent", PROPERTY_HINT_RESOURCE_TYPE, "Node"), PropertyInfo(Variant::STRING, "name"), PropertyInfo(Variant::PACKED_BYTE_ARRAY, "data"))); + ADD_SIGNAL(MethodInfo("spawn_requested", PropertyInfo(Variant::INT, "id"), PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "parent", PROPERTY_HINT_RESOURCE_TYPE, "Node"), PropertyInfo(Variant::STRING, "name"), PropertyInfo(Variant::PACKED_BYTE_ARRAY, "data"))); + ADD_SIGNAL(MethodInfo("replicated_instance_added", PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node"))); + ADD_SIGNAL(MethodInfo("replicated_instance_removed", PropertyInfo(Variant::INT, "scene_id"), PropertyInfo(Variant::OBJECT, "node", PROPERTY_HINT_RESOURCE_TYPE, "Node"))); + + BIND_ENUM_CONSTANT(REPLICATION_MODE_NONE); + BIND_ENUM_CONSTANT(REPLICATION_MODE_SERVER); + BIND_ENUM_CONSTANT(REPLICATION_MODE_CUSTOM); +} |