mirror of https://github.com/doitsujin/dxvk
65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
#pragma once
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#include <chrono>
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#include <cstdint>
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#if defined(_WIN32) && !defined(__WINE__)
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#include <windows.h>
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#endif
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namespace dxvk {
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#if defined(_WIN32) && !defined(__WINE__)
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struct high_resolution_clock {
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static constexpr bool is_steady = true;
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using rep = int64_t;
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using period = std::nano;
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using duration = std::chrono::nanoseconds;
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using time_point = std::chrono::time_point<high_resolution_clock>;
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static inline time_point now() noexcept {
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return get_time_from_counter(get_counter());
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}
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static inline time_point get_time_from_counter(int64_t counter) {
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// Keep the frequency static, this doesn't change at all.
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static const int64_t freq = get_frequency();
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const int64_t whole = (counter / freq) * period::den;
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const int64_t part = (counter % freq) * period::den / freq;
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return time_point(duration(whole + part));
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}
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static inline int64_t get_frequency() {
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LARGE_INTEGER freq;
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QueryPerformanceFrequency(&freq);
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return freq.QuadPart;
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}
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static inline int64_t get_counter() {
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LARGE_INTEGER count;
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QueryPerformanceCounter(&count);
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return count.QuadPart;
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}
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};
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#else
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struct high_resolution_clock : public std::chrono::high_resolution_clock {
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static inline time_point get_time_from_counter(int64_t counter) {
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return time_point() + duration(counter);
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}
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static inline int64_t get_frequency() {
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return period::den;
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}
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static inline int64_t get_counter() {
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return now().time_since_epoch().count();
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}
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};
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#endif
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} |