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);
}