webasm_timebase.hpp

#pragma once
 
#include <chrono>
#include <cstdint>
 
#include "timebase.hpp"
 
namespace LibXR
{
 
class WebAsmTimebase : public Timebase
{
 public:
  WebAsmTimebase()
  {
    // Initialize reference timestamp.
    start_time_ = std::chrono::system_clock::now();
  }
 
  MicrosecondTimestamp _get_microseconds() override
  {
    auto now = std::chrono::system_clock::now();
    auto us =
        std::chrono::duration_cast<std::chrono::microseconds>(now - start_time_).count();
    return static_cast<MicrosecondTimestamp>(us % UINT32_MAX);
  }
 
  MillisecondTimestamp _get_milliseconds() override
  {
    auto now = std::chrono::system_clock::now();
    auto ms =
        std::chrono::duration_cast<std::chrono::milliseconds>(now - start_time_).count();
    return static_cast<MillisecondTimestamp>(ms % UINT32_MAX);
  }
 
 private:
  std::chrono::system_clock::time_point start_time_;
};
 
}  // namespace LibXR