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<H2> 8.2 Dependencies </H2>
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<P>
To make sure some parts of Crystal Space can be used by themselves, there is
a philosophy, about which parts of Crystal Space are allowed to use other
parts. You can think of the various modules as sitting on a specific level:
</P><P>
<EM>Note</EM>: This information may not be fully accurate at the time you read
this. Crystal Space is moving toward a system of plug-in modules which
advertise pure, abstract interfaces which often imply much less dependency
than actually linking with a library.
</P><P>
<UL>
<LI>Level 1: <EM>Utility--Independant of CS</EM>
<P>
<UL>
<LI>
<CODE>libjpeg</CODE>
<LI>
<CODE>libpng</CODE>
<LI>
<CODE>zlib</CODE>
<LI>
<CODE>csgeom</CODE>
<LI>
<CODE>csutil</CODE>
</UL>
<P>
<LI>Level 2: <EM>Basics--Common Base of Various CS Parts</EM>
<P>
<UL>
<LI>
<CODE>cssys</CODE>
</UL>
<P>
<LI>Level 3: <EM>SCF--Various Interchangeable Plug-In Modules of CS</EM>
<P>
<UL>
<LI>
<CODE>video/canvas</CODE>
<LI>
<CODE>video/renderer</CODE>
<LI>
<CODE>network/driver</CODE>
<LI>
<CODE>sound/driver</CODE>
<LI>
<CODE>sound/renderer</CODE>
</UL>
<P>
<LI>Level 4: <EM>Engine--Binds Together Engines Components</EM>
<P>
<UL>
<LI>
<CODE>csengine</CODE>
<LI>
<CODE>csparser</CODE>
</UL>
<P>
<LI>Level 5: <EM>Support--Adds a Common Layer of Engine Abstraction</EM>
<P>
<UL>
<LI>
<CODE>csws</CODE>
<LI>
<CODE>csphyzik</CODE>
</UL>
<P>
<LI>Level 6: <EM>Application</EM>
<P>
<UL>
<LI>
<CODE>walktest</CODE>
<LI>
<CODE>metademo</CODE>
</UL>
</UL>
<P>
Every modules is only allowed to include headers from the same modules or from
lower levels. So for example, `<TT>csengine</TT>' may include headers from
`<TT>csutil</TT>' but not from `<TT>csws</TT>' or `<TT>csparser</TT>'.
</P><P>
All communication between level 3 libraries happens through SCF
interfaces. Those are defined in the `<TT>CS/include</TT>' directory. That is
the <EM>only</EM> way to communicate on level 3. `<TT>csengine</TT>' can use level
3 libraries only through SCF.
<A NAME="Makefile How-To"></A>
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