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The term quad buffering is the use of double buffering for each of the left and right eye images in stereoscopic implementations, thus four buffers total (if triple buffering was used then there would be six buffers). The command to swap or copy the buffer typically applies to both pairs at once, so at no time does one eye see an older image ...
The most common solution is to use multiple buffering. Most systems use multiple buffering and some means of synchronization of display and video memory refresh cycles. [3] Option "TearFree" "boolean": disable or enable TearFree updates. This option forces X to perform all rendering to a back buffer before updating the actual display.
The flicker of a CRT monitor can cause various symptoms in those sensitive to it such as eye strain, headaches [9] in migraine sufferers, and seizures in epileptics. [10]As the flicker is most clearly seen at the edge of our vision there is no obvious risk in using a CRT, but prolonged use can cause a sort of retinal shock where the flickering is seen even when looking away from the monitor.
Double buffering Using a dedicated buffer for rendering and copying the result to the screen buffer when finished. This prevents stutter on the screen and the user seeing rendering in progress. Drawcall A single rendering command submitted to a rendering API, referring to a single set of render states.
However, the lower refresh rate of 50 Hz introduces more flicker, so sets that use digital technology to double the refresh rate to 100 Hz are now very popular. (see Broadcast television systems ) Another difference between 50 Hz and 60 Hz standards is the way motion pictures (film sources as opposed to video camera sources) are transferred or ...
In these cases, the CPU may use the extra video memory for other purposes. For example, one use is as a scratch-pad for uncompressing graphics or sound data stored in cartridge ROM into. Another popular use is to create a second copy of some or all of the display data to eliminate flickering and tearing, a technique known as double buffering.
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The final part of Carmack's technique is to use the same EGA hardware scrolling features to also implement double buffering. This establishes a second buffer into which the code can draw while the first buffer is being displayed, which is then switched out during screen refresh.