Quadruple D (which stands for "Do the DirectDraw with Delphi") is a DirectX library for Delphi developed by a Japanese programmer named "SANDMAN". It has become the de facto graphics library for Japanese PC games written in Delphi.
In addition to DirectX routines, the library also includes the "Quadruple D Archiver" tool, and contains functions to read files from the .QDA archives created by the archiver.
- (Japanese) Information page
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