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#include "nes/app/input/input-buffer.hh"
#include "nes/app/input/input-event.hh"
namespace nes::app
{
auto input_buffer::key_down(key const k) -> void
{
set_pressed(k, true);
}
auto input_buffer::key_up(key const k) -> void
{
set_pressed(k, false);
}
auto input_buffer::read_key(key const k) -> bool
{
return get_event(k).pressed;
}
auto input_buffer::poll_event() -> input_event
{
auto it = event_queue_.begin();
if (it == event_queue_.end()) { return input_event{}; }
auto const event = *it;
auto const k = get_key(*event);
auto const pressed = event->pressed;
event_queue_.remove(it);
return pressed ? input_event::key_down(k) : input_event::key_up(k);
}
auto input_buffer::get_event(key const k) -> event&
{
return key_events_[static_cast<u32>(k)];
}
auto input_buffer::get_key(event const& ev) -> key
{
return static_cast<key>(&ev - key_events_);
}
auto input_buffer::set_pressed(key const k, bool const pressed) -> void
{
auto& event = get_event(k);
if (event.pressed == pressed) { return; }
event.pressed = pressed;
// Remove the event if it was not previously fetched (skipping it entirely), otherwise add a new event.
if (!event_queue_.remove(event))
{
event_queue_.append(event);
}
}
} // namespace nes::app
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