1 files changed, 127 insertions, 0 deletions
diff --git a/src/utils/perfstat.cpp b/src/utils/perfstat.cpp
new file mode 100644
index 000000000..839fc7291
--- /dev/null
+++ b/src/utils/perfstat.cpp
@@ -0,0 +1,127 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2018  The ManaPlus Developers
+ *
+ *  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 "logger.h"
+
+#include "utils/timer.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_LAST_STAT - 1);
+            if (time1 > time)
+            {
+                time = time1;
+                index = f;
+            }
+        }
+        if (index >= 0)
+        {
+            worstFrameStats = perfStats[index];
+            logger->log("worst frame: %d, %d",
+                perfStats[index].ticks[PERFSTAT_LAST_STAT - 1],
+                worstFrameStats.ticks[PERFSTAT_LAST_STAT - 1]);
+            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 - val1;
+    }
+
+    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 - val1;
+    }
+}