Quote:
Originally Posted by AMIGASYSTEM
Sorry Toni, technically i do not know how it works, as you can see from the screenshot DoomAttack allows you to play Doom in Window
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This is nothing special. RTG games can support windowed mode but using overlay adds some nice extra features compared to fullscreen/overlay mode:
- overlay can support scaling for free. (This is very useful for video players)
- overlay can support different color depths (overlay can for example use 16-bit mode when WB is using 32-bit mode)
Overlay is basically separate "fullscreen mode" overlayed in top of normal screen, position and size can be freely chosen. Overlays were supported in hardware in most VGA chips. Later models used 3D hardware to do the overlay and dropped the hardware level bitmap overlay support.