timer.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2011-2019 The ManaPlus Developers
 * Copyright (C) 2019-2021 Andrei Karas
 *
 * This file is part of The ManaPlus Client.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "utils/timer.h"
 
#include "const/utils/timer.h"
 
PRAGMA48(GCC diagnostic push)
PRAGMA48(GCC diagnostic ignored "-Wshadow")
#include <SDL_timer.h>
PRAGMA48(GCC diagnostic pop)
 
#include <climits>
 
#include "debug.h"
 
namespace
{
#ifdef USE_SDL2
 SDL_TimerID mLogicCounterId(0);
 SDL_TimerID mSecondsCounterId(0);
#else // USE_SDL2
 
 SDL_TimerID mLogicCounterId(nullptr);
 SDL_TimerID mSecondsCounterId(nullptr);
#endif // USE_SDL2
} // namespace
 
static const int MAX_TICK_VALUE = INT_MAX / 2;
 
volatile int tick_time; 
volatile int fps = 0; 
volatile int lps = 0; 
volatile int frame_count = 0; 
volatile int logic_count = 0; 
volatile time_t cur_time = 0;
 
static uint32_t nextTick(uint32_t interval, void *param A_UNUSED);
static uint32_t nextSecond(uint32_t interval, void *param A_UNUSED);
 
static uint32_t nextTick(uint32_t interval, void *param A_UNUSED)
{
 tick_time = tick_time + 1;
 if (tick_time == MAX_TICK_VALUE)
 tick_time = 0;
 return interval;
}
 
static uint32_t nextSecond(uint32_t interval, void *param A_UNUSED)
{
 fps = frame_count;
 lps = logic_count;
 frame_count = 0;
 logic_count = 0;
 
 return interval;
}
 
int get_elapsed_time(const int startTime)
{
 const int time = tick_time;
 if (startTime <= time)
 {
 return (time - startTime) * MILLISECONDS_IN_A_TICK;
 }
 return (time + (MAX_TICK_VALUE - startTime))
 * MILLISECONDS_IN_A_TICK;
}
 
int get_elapsed_time1(const int startTime)
{
 const int time = tick_time;
 if (startTime <= time)
 return time - startTime;
 return time + (MAX_TICK_VALUE - startTime);
}
 
void startTimers()
{
 // Initialize logic and seconds counters
 tick_time = 0;
 mLogicCounterId = SDL_AddTimer(MILLISECONDS_IN_A_TICK, nextTick, nullptr);
 mSecondsCounterId = SDL_AddTimer(1000, nextSecond, nullptr);
}
 
void stopTimers()
{
 SDL_RemoveTimer(mLogicCounterId);
 SDL_RemoveTimer(mSecondsCounterId);
}