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<hr><h1>sound_driver.cpp</h1><a href="sound__driver_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 
00007 <font class="comment">/* Copyright, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025 
00026 <font class="preprocessor">#include "<a class="code" href="sound__driver_8h.html">sound/driver/sound_driver.h</a>"</font>
00027 <font class="preprocessor">#include "<a class="code" href="debug_8h.html">nel/misc/debug.h</a>"</font>
00028 
00029 
00030 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00031 <font class="preprocessor"></font>
00032 <font class="preprocessor">#include &lt;windows.h&gt;</font>
00033 
00034 <font class="preprocessor">#else // NL_OS_WINDOWS</font>
00035 <font class="preprocessor"></font>
00036 <font class="preprocessor">#include &lt;dlfcn.h&gt;</font>
00037 
00038 <font class="preprocessor">#endif // NL_OS_WINDOWS</font>
00039 <font class="preprocessor"></font>
00040 
00041 <font class="keyword">namespace </font>NLSOUND
00042 {
00043 
00044 
00045 <font class="comment">// Interface version</font>
<a name="l00046"></a><a class="code" href="classNLSOUND_1_1ISoundDriver.html#p0">00046</a> <font class="keyword">const</font> uint32 ISoundDriver::InterfaceVersion = 0x04;
00047 
00048 <font class="keyword">typedef</font> ISoundDriver* (*ISDRV_CREATE_PROC)(void); 
00049 <font class="keyword">const</font> <font class="keywordtype">char</font> *<a class="code" href="namespaceNLSOUND.html#a39">IDRV_CREATE_PROC_NAME</a> = <font class="stringliteral">"NLSOUND_createISoundDriverInstance"</font>;
00050 
00051 <font class="keyword">typedef</font> <a class="code" href="memory__common_8h.html#a11">uint32</a> (*<a class="code" href="namespaceNLSOUND.html#a40">ISDRV_VERSION_PROC</a>)(void); 
00052 <font class="keyword">const</font> <font class="keywordtype">char</font> *<a class="code" href="namespaceNLSOUND.html#a41">IDRV_VERSION_PROC_NAME</a> = <font class="stringliteral">"NLSOUND_interfaceVersion"</font>;
00053 
00054 
00055 
00056 <font class="comment">/*</font>
00057 <font class="comment"> * The static method which builds the sound driver instance</font>
00058 <font class="comment"> */</font>
<a name="l00059"></a><a class="code" href="classNLSOUND_1_1ISoundDriver.html#d0">00059</a> ISoundDriver    *ISoundDriver::createDriver()
00060 {
00061         <a class="code" href="namespaceNLSOUND.html#a38">ISDRV_CREATE_PROC</a>       createSoundDriver = NULL;
00062         <a class="code" href="namespaceNLSOUND.html#a40">ISDRV_VERSION_PROC</a>      versionDriver = NULL;
00063 
00064 <font class="preprocessor">#ifdef NL_OS_WINDOWS</font>
00065 <font class="preprocessor"></font>
00066         <font class="comment">// WINDOWS code.</font>
00067         HINSTANCE                       hInst;
00068 
00069         hInst = LoadLibrary(NLSOUND_DLL_NAME);
00070 
00071         <font class="keywordflow">if</font> (!hInst)
00072         {
00073                 <font class="keywordflow">throw</font> ESoundDriverNotFound();
00074         }
00075 
00076         <font class="keywordtype">char</font> buffer[1024], *ptr;
00077         SearchPath (NULL, NLSOUND_DLL_NAME, NULL, 1023, buffer, &amp;ptr);
00078         <a class="code" href="debug_8h.html#a1">nlinfo</a> (<font class="stringliteral">"Using the library '"</font>NLSOUND_DLL_NAME<font class="stringliteral">"' that is in the directory: '%s'"</font>, buffer);
00079 
00080         createSoundDriver = (ISDRV_CREATE_PROC) GetProcAddress (hInst, <a class="code" href="namespaceNLSOUND.html#a39">IDRV_CREATE_PROC_NAME</a>);
00081         <font class="keywordflow">if</font> (createSoundDriver == NULL)
00082         {
00083                 <a class="code" href="debug_8h.html#a1">nlinfo</a>( <font class="stringliteral">"Error: %u"</font>, GetLastError() );
00084                 <font class="keywordflow">throw</font> ESoundDriverCorrupted();
00085         }
00086 
00087         versionDriver = (ISDRV_VERSION_PROC) GetProcAddress (hInst, <a class="code" href="namespaceNLSOUND.html#a41">IDRV_VERSION_PROC_NAME</a>);
00088         <font class="keywordflow">if</font> (versionDriver != NULL)
00089         {
00090                 <font class="keywordflow">if</font> (versionDriver()&lt;ISoundDriver::InterfaceVersion)
00091                         <font class="keywordflow">throw</font> ESoundDriverOldVersion();
00092                 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (versionDriver()&gt;ISoundDriver::InterfaceVersion)
00093                         <font class="keywordflow">throw</font> ESoundDriverUnknownVersion();
00094         }
00095 
00096 <font class="preprocessor">#elif defined (NL_OS_UNIX)</font>
00097 <font class="preprocessor"></font>
00098         <font class="comment">// Unix code</font>
00099         <font class="keywordtype">void</font> *handle = dlopen(NLSOUND_DLL_NAME, RTLD_NOW);
00100 
00101         <font class="keywordflow">if</font> (handle == NULL)
00102         {
00103                 <a class="code" href="debug_8h.html#a2">nlwarning</a> (<font class="stringliteral">"when loading dynamic library '%s': %s"</font>, NLSOUND_DLL_NAME, dlerror());
00104                 <font class="keywordflow">throw</font> ESoundDriverNotFound();
00105         }
00106 
00107         <font class="comment">/* Not ANSI. Might produce a warning */</font>
00108         createSoundDriver = (ISDRV_CREATE_PROC) dlsym (handle, <a class="code" href="namespaceNLSOUND.html#a39">IDRV_CREATE_PROC_NAME</a>);
00109         <font class="keywordflow">if</font> (createSoundDriver == NULL)
00110         {
00111                 <a class="code" href="debug_8h.html#a2">nlwarning</a> (<font class="stringliteral">"when getting function in dynamic library '%s': %s"</font>, NLSOUND_DLL_NAME, dlerror());
00112                 <font class="keywordflow">throw</font> ESoundDriverCorrupted();
00113         }
00114 
00115         versionDriver = (ISDRV_VERSION_PROC) dlsym (handle, <a class="code" href="namespaceNLSOUND.html#a41">IDRV_VERSION_PROC_NAME</a>);
00116         <font class="keywordflow">if</font> (versionDriver != NULL)
00117         {
00118                 <font class="keywordflow">if</font> (versionDriver()&lt;ISoundDriver::InterfaceVersion)
00119                         <font class="keywordflow">throw</font> ESoundDriverOldVersion();
00120                 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (versionDriver()&gt;ISoundDriver::InterfaceVersion)
00121                         <font class="keywordflow">throw</font> ESoundDriverUnknownVersion();
00122         }
00123 
00124 <font class="preprocessor">#else // NL_OS_LINUX</font>
00125 <font class="preprocessor"></font><font class="preprocessor">#error "Dynamic DLL loading not implemented!"</font>
00126 <font class="preprocessor"></font><font class="preprocessor">#endif // NL_OS_LINUX</font>
00127 <font class="preprocessor"></font>
00128         <a class="code" href="classNLSOUND_1_1ISoundDriver.html#b0">ISoundDriver</a> *ret = createSoundDriver();
00129         <font class="keywordflow">if</font> ( ret == NULL )
00130         {
00131                 <font class="keywordflow">throw</font> ESoundDriverCantCreateDriver();
00132         }
00133         <font class="keywordflow">return</font> ret;
00134 }
00135 
00136 
00137 } <font class="comment">// NLSOUND</font>
</pre></div>

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