A conceptually rectangular area in memory that is generally used to store bitmaps that will be blitted to a back buffer before being displayed. Commonly used to store sprites.
Operation code that defines how the vertices in an execute buffer should be interpreted or how the state of the system should be changed.
The average number of times a screen pixel is written to.
A conceptually rectangular area in memory whose stored image information will cover the image information of the primary surface to which it is applied. Overlays are assumed to be on top of all other screen components.
Determines the order in which overlays clip each other, enabling a hardware sprite system to be implemented under DirectDraw.