mirror of
https://github.com/love2d/love.git
synced 2026-08-12 08:30:56 +02:00
Alex Szpakowski
110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
/**
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* Copyright (c) 2006-2016 LOVE Development Team
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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#ifndef LOVE_TIMER_TIMER_H
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#define LOVE_TIMER_TIMER_H
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// LOVE
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#include "common/Module.h"
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namespace love
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{
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namespace timer
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{
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class Timer : public Module
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{
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public:
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Timer();
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virtual ~Timer() {}
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// Implements Module.
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virtual ModuleType getModuleType() const { return M_TIMER; }
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/**
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* Measures the time between this call and the previous call,
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* and updates internal values accordinly.
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**/
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virtual void step();
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/**
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* Tries to sleep for the specified amount of time. The precision is
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* usually 1ms.
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* @param seconds The number of seconds to sleep for.
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**/
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virtual void sleep(double seconds) const = 0;
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/**
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* Gets the time between the last two frames, assuming step is called
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* each frame.
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**/
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virtual double getDelta() const;
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/**
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* Gets the average FPS over the last second. Beucase the value is only updated
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* once per second, it does not look erratic when displayed on screen.
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* @return The "current" FPS.
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**/
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virtual int getFPS() const;
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/**
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* Gets the average delta time (seconds per frame) over the last second.
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**/
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virtual double getAverageDelta() const;
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/**
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* Gets the amount of time passed since an unspecified time. Useful for
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* profiling code or measuring intervals. The time is microsecond-precise,
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* and increases monotonically.
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* @return The time (in seconds)
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**/
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static double getTime();
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private:
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// Frame delta vars.
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double currTime;
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double prevTime;
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double prevFpsUpdate;
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// Updated with a certain frequency.
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int fps;
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double averageDelta;
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// The frequency by which to update the FPS.
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double fpsUpdateFrequency;
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// Frames since last FPS update.
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int frames;
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// The current timestep.
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double dt;
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// Returns the timer period on some platforms.
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static double getTimerPeriod();
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}; // Timer
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} // timer
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} // love
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#endif // LOVE_TIMER_TIMER_H
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