Introducing swapchains

Swapchains are a mechanism by which the rendering of the drawing primitive is shown on a platform-specific presentation window/surface. A swapchain may contain single or multiple drawing images. These drawing images are called color images. A color image is simply an array of pixel information that resides in a special layout in the memory. The number of draw images in a swapchain is very specific to the implementation. When double images are used, it's called double buffering, and when three surfaces are used, triple buffering.

Among these images, when one image completes the drawing process in the background, it is swapped to the presentation window. In order to fully utilize the GPU, a different image is then treated as a background buffer for the drawing process. This process is repeated back and forth and the swapping of the images takes place continuously. Making use of multiple images improves the frame rate output as the GPU is always constantly busy with the...