Of course, each of these measurements was taken dozens of times, to obtain a precise average input lag for each of the controllers tested. and receiving information from the system that the button has been pressed. All it has to do is time the time elapsing between pressing the button. The Raspberry Pi will then be able to press the button itself, just as a gamer would.
To do this, we've created a loop: a button on the joystick or arcade panel is connected to one of the Raspberry Pi's GPIO pins. To do this, we're going to try out different controllers and arcade kits, and compare the results obtained according to the systems used. finally, the Latency Bro will enable us to measure the famous global latency as a whole.įirst, we're going to concentrate on input lag.an oscilloscope will enable us to measure the sum of input lag and process lag.input-lag-tools will enable us to specifically measure controller-related input lag.Well, quite simply with precise tools and methodologies! So, you might ask: how can we measure all this in a factual way? Video lag is considered to be non-existent on CRT screens, although it can vary depending on the configuration of your HDTV. video lag, which is the time between your console sending the video signal and its display on screen.process lag, which is the processing time taken by the emulator to generate a new frame according to the event received.This time can vary enormously depending on the controller, protocol (wired, USB, i2c, Bluetooth.), emulator configuration or operating system you're using. input lag, in the literal sense of the term, which corresponds solely to the time it takes for the emulator to register the press of a key.To put it simply: global latency is the time it takes for your character to react, when you press a button on your controller.īut behind the term overall latency, there are actually 3 very distinct phases :
Here, we prefer to use the more appropriate term global lag. Input lag is a term that's become a bit of a catch-all when it comes to defining a game's reaction time after an action on your part. That's what we're going to try to do in this blog post!īefore we get down to the technical side of things, let's talk a bit about semantics, to make sure we understand what we're talking about. In the midst of fantasies and preconceived ideas, we felt it was vital to provide you with a transparent, factual, technical and rational explanation. Many talk about it, but few really master the subject. Input lag is a serious and highly technical subject, which for some remains an eternal debate. Since the release of the Recalbox RGB DUAL and even more so since the launch of the Recalbox RGB JAMMA campaign, many of you have been asking questions about input lag.
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