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https://github.com/ReMinecraftPE/mcpe.git
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100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
/********************************************************************
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Minecraft: Pocket Edition - Decompilation Project
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Copyright (C) 2023 iProgramInCpp
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The following code is licensed under the BSD 1 clause license.
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SPDX-License-Identifier: BSD-1-Clause
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********************************************************************/
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#include "Timer.hpp"
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#include "common/Utils.hpp"
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#if !defined(_WIN32) && defined(USE_ACCURATE_TIMER)
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#error "Implement getAccurateTimeMs() for your platform!"
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#endif
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#if defined(_WIN32) && defined(USE_ACCURATE_TIMER)
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static LARGE_INTEGER s_StartTime;
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static bool s_Initted;
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double getAccurateTimeMs()
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{
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// Thanks to @Kleadron for helping out with this!
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if (!s_Initted)
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{
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s_Initted = true;
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QueryPerformanceCounter(&s_StartTime);
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}
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LARGE_INTEGER frequency;
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QueryPerformanceFrequency(&frequency);
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LARGE_INTEGER currentCounter;
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QueryPerformanceCounter(¤tCounter);
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LONGLONG diff = currentCounter.QuadPart - s_StartTime.QuadPart;
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return double(diff) / double(frequency.QuadPart) * 1000.0;
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}
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#endif
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void Timer::advanceTime()
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{
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#ifdef USE_ACCURATE_TIMER
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double timeMs = getAccurateTimeMs();
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#else
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int timeMs = getTimeMs();
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#endif
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if (timeMs - m_lastSyncTime <= 1000)
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{
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if (timeMs - m_lastSyncTime < 0)
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{
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m_lastSyncTime = m_unprocessedTime = timeMs;
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}
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}
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else
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{
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#ifdef USE_ACCURATE_TIMER
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double diff1 = timeMs - m_lastSyncTime;
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double diff2 = timeMs - m_unprocessedTime;
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#else
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int diff1 = timeMs - m_lastSyncTime;
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int diff2 = timeMs - m_unprocessedTime;
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#endif
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m_tickAdjustment += ((float(diff1) / float(diff2)) - m_tickAdjustment) * 0.2f;
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}
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float diff = float(timeMs) / 1000.0f - m_lastUpdateTime;
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m_lastUpdateTime = float(timeMs) / 1000.0f;
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float x1 = diff * m_tickAdjustment;
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if (x1 > 1) x1 = 1;
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if (x1 < 0) x1 = 0;
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float x2 = m_partialTicks + x1 * m_timerSpeed * m_ticksPerSecond;
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m_ticks = int(x2);
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m_partialTicks = x2 - m_ticks;
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m_renderTicks = x2 - m_ticks;
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if (m_ticks > 10)
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m_ticks = 10;
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}
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Timer::Timer()
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{
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m_lastUpdateTime = 0;
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#ifndef USE_ACCURATE_TIMER
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m_lastSyncTime = 0;
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m_unprocessedTime = 0;
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#else
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m_lastSyncTime = 0;
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m_unprocessedTime = 0;
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#endif
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m_tickAdjustment = 1.0f;
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m_ticksPerSecond = 20.0f;
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m_ticks = 0;
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m_renderTicks = 0;
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m_timerSpeed = 1.0f;
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m_partialTicks = 0;
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m_lastSyncTime = m_unprocessedTime = getTimeMs();
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}
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