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