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XEngine uses and depends on the following excellent Open Source projects:
wxWidgets
STLport
Boost
Spirit
DevIL
lib3ds
FFTW

Documentation

The XEngine source code is documented using the excellent tool doxygen.
Click here to browse the API reference.
You can also download a compiled HTML file that contains the entire documentation. Note that this file can be viewed on any Windows and on Linux using e.g. KchmViewer.

You can also download and read a couple of papers that present an introduction to programmable graphics pipelines and shaders, describe the engine's design and implementation, and discuss the programming guidelines used in the XEngine source code:

• System Design and Implementation
• Programmable Graphics Pipeline Architectures
• Programming Guidelines

The System Design and Implementation document is a bit outdated at the moment. Although the basic engine structure has not changed much from what is described in that document, a lot of small details have changed. It is nevertheless an interesting read when you start out with the engine as it explains some of the basic concepts of the engine. The document also describes most of the conventions used throughout the engine, such as the layout of vectors and matrices and the various coordinate systems used, which have not changed.