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Profiler: Implement QPCClock to get better precision on Win32

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MSVC 2013 (at least) doesn't use QueryPerformanceCounter to implement
std::chrono::high_resolution_clock, so it has bad precision. Manually
implementing our own clock type using it works around this for now.
This commit is contained in:
Yuri Kunde Schlesner 2015-02-15 15:49:27 -02:00
parent cd1fbfcf1b
commit dc8a3f8bc8
2 changed files with 42 additions and 1 deletions
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20
src/common/profiler.h
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@ -18,8 +18,26 @@ namespace Profiling {
#define ENABLE_PROFILING 1
#endif
using Duration = std::chrono::nanoseconds;
#if defined(_MSC_VER) && _MSC_VER <= 1800 // MSVC 2013
// MSVC up to 2013 doesn't use QueryPerformanceCounter for high_resolution_clock, so it has bad
// precision. We manually implement a clock based on QPC to get good results.
struct QPCClock {
using duration = std::chrono::microseconds;
using time_point = std::chrono::time_point<QPCClock>;
using rep = duration::rep;
using period = duration::period;
static const bool is_steady = false;
static time_point now();
};
using Clock = QPCClock;
#else
using Clock = std::chrono::high_resolution_clock;
#endif
using Duration = Clock::duration;
/**
* Represents a timing category that measured time can be accounted towards. Should be declared as a