pcsx2/plugins/LilyPad/KeyboardQueue.cpp

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/* LilyPad - Pad plugin for PS2 Emulator
* Copyright (C) 2002-2014 PCSX2 Dev Team/ChickenLiver
*
* PCSX2 is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Found- ation, either version 3 of the License, or (at your option)
* any later version.
*
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with PCSX2. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Global.h"
// This is undoubtedly completely unnecessary.
#include "KeyboardQueue.h"
// What MS calls a single process Mutex. Faster, supposedly.
// More importantly, can be abbreviated, amusingly, as cSection.
#ifdef _MSC_VER
static CRITICAL_SECTION cSection;
static u8 csInitialized = 0;
#else
static std::mutex cSection;
#endif
#define EVENT_QUEUE_LEN 16
// Actually points one beyond the last queued event.
static u8 lastQueuedEvent = 0;
static u8 nextQueuedEvent = 0;
static keyEvent queuedEvents[EVENT_QUEUE_LEN];
void QueueKeyEvent(int key, int event)
{
#ifdef _MSC_VER
if (!csInitialized) {
csInitialized = 1;
InitializeCriticalSection(&cSection);
}
EnterCriticalSection(&cSection);
#else
std::lock_guard<std::mutex> lock(cSection);
#endif
// Don't queue events if escape is on top of queue. This is just for safety
// purposes when a game is killing the emulator for whatever reason.
if (nextQueuedEvent == lastQueuedEvent ||
queuedEvents[nextQueuedEvent].key != VK_ESCAPE ||
queuedEvents[nextQueuedEvent].evt != KEYPRESS) {
// Clear queue on escape down, bringing escape to front. May do something
// with shift/ctrl/alt and F-keys, later.
if (event == KEYPRESS && key == VK_ESCAPE) {
nextQueuedEvent = lastQueuedEvent;
}
queuedEvents[lastQueuedEvent].key = key;
queuedEvents[lastQueuedEvent].evt = event;
lastQueuedEvent = (lastQueuedEvent + 1) % EVENT_QUEUE_LEN;
// If queue wrapped around, remove last element.
if (nextQueuedEvent == lastQueuedEvent) {
nextQueuedEvent = (nextQueuedEvent + 1) % EVENT_QUEUE_LEN;
}
}
#ifdef _MSC_VER
LeaveCriticalSection(&cSection);
#endif
}
int GetQueuedKeyEvent(keyEvent *event)
{
if (lastQueuedEvent == nextQueuedEvent)
return 0;
#ifdef _MSC_VER
EnterCriticalSection(&cSection);
#else
std::lock_guard<std::mutex> lock(cSection);
#endif
*event = queuedEvents[nextQueuedEvent];
nextQueuedEvent = (nextQueuedEvent + 1) % EVENT_QUEUE_LEN;
#ifdef _MSC_VER
LeaveCriticalSection(&cSection);
#endif
return 1;
}
void ClearKeyQueue()
{
lastQueuedEvent = nextQueuedEvent;
#ifdef _MSC_VER
if (csInitialized) {
DeleteCriticalSection(&cSection);
csInitialized = 0;
}
#endif
}