EventDelay.cc

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#include "EventDelay.hh"
#include "EventDistributor.hh"
#include "MSXEventDistributor.hh"
#include "ReverseManager.hh"
#include "Event.hh"
#include "Timer.hh"
#include "MSXException.hh"
#include "narrow.hh"
#include "one_of.hh"
#include "ranges.hh"
#include "stl.hh"
#include <cassert>
 
#include <SDL.h>
 
namespace openmsx {
 
EventDelay::EventDelay(Scheduler& scheduler_,
                       CommandController& commandController,
                       EventDistributor& eventDistributor_,
                       MSXEventDistributor& msxEventDistributor_,
                       ReverseManager& reverseManager)
        : Schedulable(scheduler_)
        , eventDistributor(eventDistributor_)
        , msxEventDistributor(msxEventDistributor_)
        , prevEmu(EmuTime::zero())
        , prevReal(Timer::getTime())
        , delaySetting(
                commandController, "inputdelay",
                "delay input to avoid key-skips", 0.0, 0.0, 10.0)
{
        using enum EventType;
        for (auto type : {KEY_DOWN, KEY_UP,
                          MOUSE_MOTION, MOUSE_BUTTON_DOWN, MOUSE_BUTTON_UP,
                          JOY_AXIS_MOTION, JOY_HAT, JOY_BUTTON_DOWN, JOY_BUTTON_UP}) {
                eventDistributor.registerEventListener(type, *this, EventDistributor::MSX);
        }
 
        reverseManager.registerEventDelay(*this);
}
 
EventDelay::~EventDelay()
{
        using enum EventType;
        for (auto type : {JOY_BUTTON_UP, JOY_BUTTON_DOWN, JOY_HAT, JOY_AXIS_MOTION,
                          MOUSE_BUTTON_UP, MOUSE_BUTTON_DOWN, MOUSE_MOTION,
                          KEY_UP, KEY_DOWN}) {
                eventDistributor.unregisterEventListener(type, *this);
        }
}
 
int EventDelay::signalEvent(const Event& event)
{
        toBeScheduledEvents.push_back(event);
        if (delaySetting.getDouble() == 0.0) {
                sync(getCurrentTime());
        }
        return 0;
}
 
void EventDelay::sync(EmuTime::param curEmu)
{
        auto curRealTime = Timer::getTime();
        auto realDuration = curRealTime - prevReal;
        prevReal = curRealTime;
        auto emuDuration = curEmu - prevEmu;
        prevEmu = curEmu;
 
        double factor = emuDuration.toDouble() / narrow_cast<double>(realDuration);
        EmuDuration extraDelay(delaySetting.getDouble());
 
#if PLATFORM_ANDROID
        // The virtual keyboard on Android sends a key press and the
        // corresponding key release event directly after each other, without a
        // delay. It sends both events either when the user has finished a
        // short tap or alternatively after the user has hold the button
        // pressed for a few seconds and then has selected the appropriate
        // character from the multi-character-popup that the virtual keyboard
        // displays when the user holds a button pressed for a short while.
        // Either way, the key release event comes way too short after the
        // press event for the MSX to process it. The two events follow each
        // other within a few milliseconds at most. Therefore, on Android,
        // special logic must be foreseen to delay the release event for a
        // short while. This special logic correlates each key release event
        // with the corresponding press event for the same key. If they are
        // less then 2/50 second apart, the release event gets delayed until
        // the next sync call. The 2/50 second has been chosen because it can
        // take up to 2 vertical interrupts (2 screen refreshes) for the MSX to
        // see the key press in the keyboard matrix, thus, 2/50 seconds is the
        // minimum delay required for an MSX running in PAL mode.
        std::vector<Event> toBeRescheduledEvents;
#endif
 
        EmuTime time = curEmu + extraDelay;
        for (auto& e : toBeScheduledEvents) {
#if PLATFORM_ANDROID
                if (getType(e) == one_of(EventType::KEY_DOWN, EventType::KEY_UP)) {
                        const auto& keyEvent = get_event<KeyEvent>(e);
                        int maskedKeyCode = int(keyEvent.getKeyCode()) & int(Keys::K_MASK);
                        auto it = ranges::find(nonMatchedKeyPresses, maskedKeyCode,
                                               [](const auto& p) { return p.first; });
                        if (getType(e) == EventType::KEY_DOWN) {
                                if (it == end(nonMatchedKeyPresses)) {
                                        nonMatchedKeyPresses.emplace_back(maskedKeyCode, e);
                                } else {
                                        it->second = e;
                                }
                        } else {
                                if (it != end(nonMatchedKeyPresses)) {
                                        const auto& timedPressEvent   = get_event<TimedEvent>(it->second);
                                        const auto& timedReleaseEvent = get_event<TimedEvent>(e);
                                        auto pressRealTime = timedPressEvent.getRealTime();
                                        auto releaseRealTime = timedReleaseEvent.getRealTime();
                                        auto deltaTime = releaseRealTime - pressRealTime;
                                        if (deltaTime <= 2000000 / 50) {
                                                // The key release came less then 2 MSX interrupts from the key press.
                                                // Reschedule it for the next sync, with the realTime updated to now, so that it seems like the
                                                // key was released now and not when android released it.
                                                // Otherwise, the offset calculation for the emuTime further down below will go wrong on the next sync
                                                Event newKeyupEvent = KeyUpEvent(keyEvent.getKeyCode());
                                                toBeRescheduledEvents.push_back(newKeyupEvent);
                                                continue; // continue with next to be scheduled event
                                        }
                                        move_pop_back(nonMatchedKeyPresses, it);
                                }
                        }
                }
#endif
                scheduledEvents.push_back(e);
                const auto& sdlEvent = get_event<SdlEvent>(e);
                uint32_t eventSdlTime = sdlEvent.getCommonSdlEvent().timestamp;
                uint32_t sdlNow = SDL_GetTicks();
                auto sdlOffset = int32_t(sdlNow - eventSdlTime);
                assert(sdlOffset >= 0);
                auto offset = 1000 * int64_t(sdlOffset); // ms -> us
                EmuDuration emuOffset(factor * narrow_cast<double>(offset));
                auto schedTime = (emuOffset < extraDelay)
                               ? time - emuOffset
                               : curEmu;
                assert(curEmu <= schedTime);
                setSyncPoint(schedTime);
        }
        toBeScheduledEvents.clear();
 
#if PLATFORM_ANDROID
        append(toBeScheduledEvents, std::move(toBeRescheduledEvents));
#endif
}
 
void EventDelay::executeUntil(EmuTime::param time)
{
        try {
                auto event = std::move(scheduledEvents.front());
                scheduledEvents.pop_front();
                msxEventDistributor.distributeEvent(event, time);
        } catch (MSXException&) {
                // ignore
        }
}
 
void EventDelay::flush()
{
        EmuTime time = getCurrentTime();
 
        for (auto& e : scheduledEvents) {
                msxEventDistributor.distributeEvent(e, time);
        }
        scheduledEvents.clear();
 
        for (auto& e : toBeScheduledEvents) {
                msxEventDistributor.distributeEvent(e, time);
        }
        toBeScheduledEvents.clear();
 
        removeSyncPoints();
}
 
} // namespace openmsx