External/NRIFramework/Source/Timer.cpp - master - redgpu/nv_rt

External/NRIFramework/Source/Timer.cpp

64 строки2 KB

Constantine Tarasenkov

NRDSample commit 3dd5136f292ad958c698627d2ee19959a4117f7e, NRI commit b5cfe2c4161ccc39421041ba9ec55331af9221d1

19 апр 2024, 05:54

19 апр 2024, 05:54491b2d5

#include "Timer.h"

#include <math.h>

#if defined(_WIN32)
    #include <windows.h>
#elif defined(__linux__) || defined(__SCE__) || defined(__APPLE__)
    #include <time.h>
    #ifdef USE_MONOTONIC_TIMER
        constexpr clockid_t CLOCKID = CLOCK_MONOTONIC;
    #else
        constexpr clockid_t CLOCKID = CLOCK_REALTIME;
    #endif
#else
    #error "Undefined platform"
#endif

#define MY_MIN( a, b )   ( a < b ? a : b )
#define MY_MAX( a, b )   ( a > b ? a : b )

inline uint64_t _GetTicks()
{
#if defined(_WIN32)
    uint64_t ticks;
    QueryPerformanceCounter((LARGE_INTEGER*)&ticks);
    return ticks;
#elif defined(__linux__) || defined(__SCE__) || defined(__APPLE__)
    struct timespec spec;
    clock_gettime(CLOCKID, &spec);
    return uint64_t(spec.tv_sec) * 1000000000ull + spec.tv_nsec;
#endif
}

Timer::Timer()
{
#if defined(_WIN32)
    uint64_t ticksPerSecond = 1;
    QueryPerformanceFrequency((LARGE_INTEGER*)&ticksPerSecond);

    m_InvTicksPerMs = 1000.0 / ticksPerSecond;
#elif defined(__linux__) || defined(__SCE__) || defined(__APPLE__)
    m_InvTicksPerMs = 1.0 / 1000000.0;
#endif
}

void Timer::UpdateFrameTime()
{
    if (m_Time != 0)
    {
        double ms = (_GetTicks() - m_Time) * m_InvTicksPerMs;
        m_Delta = float(ms);

        float relativeDelta = fabsf(m_Delta - m_SmoothedDelta) / (MY_MIN(m_Delta, m_SmoothedDelta) + 1e-7f);
        float f = relativeDelta / (1.0f + relativeDelta);

        m_SmoothedDelta = m_SmoothedDelta + (m_Delta - m_SmoothedDelta) * MY_MAX(f, 1.0f / 32.0f);
        m_VerySmoothedDelta = m_VerySmoothedDelta + (m_Delta - m_VerySmoothedDelta) * MY_MAX(f, 1.0f / 64.0f);
    }

    m_Time = _GetTicks();
}

double Timer::GetTimeStamp() const
{ return _GetTicks() * m_InvTicksPerMs; }