mirror of
				https://github.com/OpenMW/openmw.git
				synced 2025-11-04 12:56:39 +00:00 
			
		
		
		
	
		
			
				
	
	
		
			57 lines
		
	
	
	
		
			2 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			57 lines
		
	
	
	
		
			2 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#ifndef OPENMW_COMPONENTS_MISC_FRAMERATELIMITER_H
 | 
						|
#define OPENMW_COMPONENTS_MISC_FRAMERATELIMITER_H
 | 
						|
 | 
						|
#include <chrono>
 | 
						|
#include <thread>
 | 
						|
 | 
						|
namespace Misc
 | 
						|
{
 | 
						|
    class FrameRateLimiter
 | 
						|
    {
 | 
						|
        public:
 | 
						|
            template <class Rep, class Ratio>
 | 
						|
            explicit FrameRateLimiter(std::chrono::duration<Rep, Ratio> maxFrameDuration,
 | 
						|
                                      std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now())
 | 
						|
                : mMaxFrameDuration(std::chrono::duration_cast<std::chrono::steady_clock::duration>(maxFrameDuration))
 | 
						|
                , mLastMeasurement(now)
 | 
						|
                , mLastFrameDuration(0)
 | 
						|
            {}
 | 
						|
 | 
						|
            std::chrono::steady_clock::duration getLastFrameDuration() const
 | 
						|
            {
 | 
						|
                return mLastFrameDuration;
 | 
						|
            }
 | 
						|
 | 
						|
            void limit(std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now())
 | 
						|
            {
 | 
						|
                const auto passed = now - mLastMeasurement;
 | 
						|
                const auto left = mMaxFrameDuration - passed;
 | 
						|
                if (left > left.zero())
 | 
						|
                {
 | 
						|
                    std::this_thread::sleep_for(left);
 | 
						|
                    mLastMeasurement = now + left;
 | 
						|
                    mLastFrameDuration = mMaxFrameDuration;
 | 
						|
                }
 | 
						|
                else
 | 
						|
                {
 | 
						|
                    mLastMeasurement = now;
 | 
						|
                    mLastFrameDuration = passed;
 | 
						|
                }
 | 
						|
            }
 | 
						|
 | 
						|
        private:
 | 
						|
            std::chrono::steady_clock::duration mMaxFrameDuration;
 | 
						|
            std::chrono::steady_clock::time_point mLastMeasurement;
 | 
						|
            std::chrono::steady_clock::duration mLastFrameDuration;
 | 
						|
    };
 | 
						|
 | 
						|
    inline Misc::FrameRateLimiter makeFrameRateLimiter(float frameRateLimit)
 | 
						|
    {
 | 
						|
        if (frameRateLimit > 0.0f)
 | 
						|
            return Misc::FrameRateLimiter(std::chrono::duration<float>(1.0f / frameRateLimit));
 | 
						|
        else
 | 
						|
            return Misc::FrameRateLimiter(std::chrono::steady_clock::duration::zero());
 | 
						|
    }
 | 
						|
}
 | 
						|
 | 
						|
#endif
 |