perfstat.cpp

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/*
 * The ManaPlus Client
 * Copyright (C) 2018-2019 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/perfstat.h"
 
#include "utils/cast.h"
 
#include "logger.h"
 
#include "debug.h"
 
PerfStats perfStats[PERFSTAT_MAX];
 
size_t perfFrameId = 0;
size_t prevPerfFrameId = PERFSTAT_MAX;
int *perfFrame = &perfStats[perfFrameId].ticks[0];
PerfStats worstFrameStats;
int worstTime = -1;
int skipPerfFrames = -1;
 
namespace Perf
{
 void init()
 {
 logger->log("perf stats init");
 worstTime = -1;
 perfFrameId = 0;
 prevPerfFrameId = 0;
 for (size_t f = 0; f < PERFSTAT_LAST_STAT; f ++)
 {
 worstFrameStats.ticks[f] = 0;
 }
 for (size_t f = 0; f < PERFSTAT_MAX; f ++)
 {
 PerfStats &perf = perfStats[f];
 for (size_t d = 0; d < PERFSTAT_LAST_STAT; d ++)
 {
 perf.ticks[d] = 0;
 }
 }
 skipPerfFrames = 0;
 }
 
 void nextFrame()
 {
 if (skipPerfFrames > 0)
 {
 skipPerfFrames --;
// logger->log("skip frames: %d", skipPerfFrames);
 return;
 }
 else if (skipPerfFrames < 0)
 {
 return;
 }
 prevPerfFrameId = perfFrameId;
 perfFrameId ++;
 if (perfFrameId >= PERFSTAT_MAX)
 {
 perfFrameId = 0;
 selectWorstFrame();
 }
 perfFrame = &perfStats[perfFrameId].ticks[0];
 }
 
 void selectWorstFrame()
 {
 int time = worstTime;
 int index = -1;
 for (size_t f = 0; f < PERFSTAT_MAX; f ++)
 {
 if (f == perfFrameId)
 continue;
 const int time1 = Perf::getTime(f, PERFSTAT_FPS_STAT - 1);
 if (time1 > time)
 {
 time = time1;
 index = CAST_S32(f);
 }
 }
 if (index >= 0)
 {
 worstFrameStats = perfStats[index];
 logger->log("worst frame: %d, %d",
 perfStats[index].ticks[PERFSTAT_FPS_STAT - 1] -
 perfStats[index].ticks[0],
 worstFrameStats.ticks[PERFSTAT_FPS_STAT - 1] -
 worstFrameStats.ticks[0]);
 worstTime = time;
 }
 }
 
 int getTime(const size_t frameId,
 const size_t counterId)
 {
 const PerfStats &perf = perfStats[frameId];
 const int val1 = perf.ticks[0];
 const int val2 = perf.ticks[counterId];
 if (val2 >= val1)
 return val2 - val1;
 return val1 - val2;
 }
 
 int getWorstTime(const size_t counterId)
 {
 const int val1 = worstFrameStats.ticks[0];
 const int val2 = worstFrameStats.ticks[counterId];
 if (val2 >= val1)
 return val2 - val1;
 return val1 - val2;
 }
} // namespace Perf