94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright © 2025 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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#include <fennec/containers/dynarray.h>
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#include <fennec/containers/set.h>
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#include <fennec/core/event.h>
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#include <fennec/threading/lock_guard.h>
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#include <fennec/threading/mpscq.h>
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#include <fennec/threading/mutex.h>
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#define FENNEC_EVENT_QUEUE_SIZE 8192
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namespace fennec
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{
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static mutex lock;
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static dynarray<set<event_listener*>> listeners;
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static mpscq<event> queue(FENNEC_EVENT_QUEUE_SIZE);
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event_listener::~event_listener() {
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event::remove_listener(this);
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}
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void event::handle_events() {
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lock_guard guard(lock);
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// if we don't copy into a temporary buffer, we could deadlock ourselves
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// if someone unwittingly calls dispatch() in an event listener.
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dynarray<unique_ptr<event>> dispatch(FENNEC_EVENT_QUEUE_SIZE);
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// we query the size instead of empty just in case someone decides to run their own thread
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// and send events from that thread.
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size_t n = queue.size();
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for (size_t i = 0; i < n; ++i) {
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dispatch[i] = queue.pop();
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}
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for (size_t i = 0; i < n; ++i) {
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_handle_event(dispatch[i]);
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}
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}
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void event::_add_listener(event_listener* listener, uint64_t type) {
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lock_guard guard(lock);
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if (listeners.size() <= type) {
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listeners.resize(type + 1);
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}
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listeners[type].insert(listener);
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}
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void event::remove_listener(event_listener* listener) {
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lock_guard guard(lock);
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for (auto& it : listeners) {
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it.erase(listener);
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}
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}
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void event::_handle_event(unique_ptr<event>& event) {
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auto type = event->get_type().id();
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for (auto& listener : listeners[type]) {
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listener->handle_event(event.get());
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}
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}
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void event::_dispatch(unique_ptr<event>&& event) {
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// queue is taking ownership of the resource
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queue.emplace(event.release());
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}
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void event::_dispatch_immediate(unique_ptr<event>&& event) {
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lock_guard guard(lock);
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_handle_event(event);
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}
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}
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