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<h3 class="subsection"> C.2.16 64-Bit Portability Changes </h3>
<p>Some changes have been made to the Crystal Space <small>API</small> in order to better
support 64-bit hardware, which is now becoming common. Additional changes to
improve 64-bit support have also been made internally, but the internal changes
essentially are transparent to external clients.
</p>
<p>The most significant change to the <small>API</small> involves methods and classes
dealing with data opaquely. Historically, opaque data has been handled using
<samp>‘void*’</samp>, and programmers would cast numbers, booleans, and pointers to
<samp>‘void*’</samp> when it was necessary to deal with the data in an opaque fashion.
This technique, however, is not portable to 64-bit platforms. For this reason,
the new standard type <samp>‘intptr_t’</samp> was introduced. This type is guaranteed
to be large enough to store any integral numeric or pointer value regardless of
the machine's word size.
</p>
<p>Crystal Space now uniformly uses <samp>‘intptr_t’</samp>, rather than <samp>‘void*’</samp>,
when dealing with opaque data. Upgrading your code to reflect this change is
usually quite simple. Where your code presently declares a variable or casts a
value to <samp>‘void*’</samp>, change it to <samp>‘intptr_t’</samp>. Likewise, <samp>‘void**’</samp>
becomes <samp>‘intptr_t*’</samp>. For example:
</p>
<table><tr><td> </td><td><pre class="example">iGraphics2D canvas = ...;
iEventOutlet* outlet = ...;
outlet->Broadcast(cscmdCanvasExposed, (void*)canvas);
</pre></td></tr></table>
<p>Becomes:
</p>
<table><tr><td> </td><td><pre class="example">outlet->Broadcast(cscmdCanvasExposed, (intptr_t)canvas);
</pre></td></tr></table>
<p>The event system is impacted by this change. Specifically, the following
methods and data members now deal with <samp>‘intptr_t’</samp> rather than <samp>‘void*’</samp>
for the opaque “info” member of <code>csevCommand</code>-type events.
</p>
<ul>
<li>
<code>csEvent::csEvent()</code>
</li><li>
<code>csEventCommandData::Info</code>
</li><li>
<code>iEventOutlet::Broadcast()</code>
</li><li>
<code>iEventOutlet::ImmediateBroadcast()</code>
</li></ul>
<p>The <small>AWS</small> plugin (Alternate Windowing System) and its interfaces have been
been updated for 64-bit platform conformance. Specifically, the following
methods now deal with <samp>‘intptr_t’</samp> rather than <samp>‘void*’</samp> for all of
<small>AWS</small>'s opaque data needs.
</p>
<ul>
<li>
<code>iAwsComponent::GetProperty()</code>
</li><li>
<code>iAwsComponent::SetProperty()</code>
</li><li>
<code>iAwsParmList::AddOpaque()</code>
</li><li>
<code>iAwsParmList::GetOpaque()</code>
</li><li>
<code>iAwsSink::RegisterTrigger()</code>
</li><li>
<code>iAwsSinkManager::CreateSink()</code>
</li></ul>
<p><small>AWS</small> callback functions (<em>triggers</em>) are likewise impacted. You need to
change the declaration of your triggers to use <samp>‘intptr_t’</samp> rather than
<samp>‘void*’</samp>. For example:
</p>
<table><tr><td> </td><td><pre class="example">void MyTrigger(void* sink, iAwsSource* source);
</pre></td></tr></table>
<p>Becomes:
</p>
<table><tr><td> </td><td><pre class="example">void MyTrigger(intptr_t sink, iAwsSource* source);
</pre></td></tr></table>
<p>Since converting client <small>AWS</small> code to the new <small>API</small> can be rather onerous
on account of the amount of repetitious manual labor involved, the old
<samp>‘void*’</samp> <small>API</small> is still present in <small>AWS</small>, though heavily
deprecated. In the interests of 64-bit portability, the old <small>API</small> will be
removed at some point in the future. You are encouraged, therefore, to convert
your code to the new <small>API</small>. As an aid to clients in upgrading their code to
the new <small>API</small>, one of two control macros can be defined which will help to
isolate code which needs to be updated. Defining <samp>‘AWS_OBSOLETE_VOIDP’</samp>
(via <samp>‘#define’</samp> before including <tt>‘iaws/aws.h’</tt>) removes from the
<small>API</small> all methods dealing with <samp>‘void*’</samp>, thus invocations of any such
methods will result in compilation errors. Alternately, defining
<samp>‘AWS_DEPRECATE_VOIDP’</samp>, will cause invocations of methods dealing with
<samp>‘void*’</samp> to generate compilation warnings, assuming that the compiler
supports such deprecation warnings. (Presently, only modern version of the
<small>GNU</small> compiler are so configured.)
</p>
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