Difference between revisions of "HOWTO-Backends"

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=== Subclassing OSystem ===
=== Subclassing OSystem ===
TODO: This section is meant to give some specific hints on creating a useful OSystem subclass. For now I can't really think of anything useful besides the obvious, and besides what we already say in other places... Take a look at [http://doxygen.scummvm.org/d9/df4/classOSystem.html OSystem class] which contains lots of useful information. Also take a look at null.cpp to see what you have to implement, and peek at the SDL backend (which is our main backend and thus kind of a reference for all the others). And finally, take a look at <tt>common/system.h</tt> to see which methods are pure abstract, and thus '''must''' be implemented by you. Oh and of course: You can always talk to us on [[IRC Channel|IRC]] or via [[Mailing lists|email]] :-).
TODO: This section is meant to give some specific hints on creating a useful OSystem subclass. For now I can't really think of anything useful besides the obvious, and besides what we already say in other places... Take a look at [http://doxygen.scummvm.org/d9/df4/classOSystem.html OSystem class] which contains lots of useful information. Also take a look at null.cpp to see what you have to implement, and peek at the SDL backend (which is our main backend and thus kind of a reference for all the others). And finally, take a look at <tt>common/system.h</tt> to see which methods are pure abstract, and thus '''must''' be implemented by you. Oh and of course: You can always talk to us on [[IRC Channel|IRC]] or via [[Mailing lists|email]] :-).
==== Testing your backend ====
We have a special game engine, called 'testbed'. Its only purpose is to perform series of tests which help engine authors to see correctness of their implementation.
To run the game, point ScummVM to directory <tt>&lt;scummvm sources root&gt;/dists/engine-data/testbed-audiocd-files/</tt> and then run. Follow the on-screen instructions.


=== Misc notes ===
=== Misc notes ===

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