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<h1>glext.c</h1> </div>
</div>
<div class="contents">
<a href="glext_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This code is (C) AllegroGL contributors, and double licensed under</span>
<a name="l00002"></a>00002 <span class="comment"> * the GPL and zlib licenses. See gpl.txt or zlib.txt for details.</span>
<a name="l00003"></a>00003 <span class="comment"> */</span>
<a name="l00008"></a>00008 <span class="preprocessor">#include "alleggl.h"</span>
<a name="l00009"></a>00009 <span class="preprocessor">#include "allglint.h"</span>
<a name="l00010"></a>00010 <span class="preprocessor">#include <string.h></span>
<a name="l00011"></a>00011 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#include <OpenGL/glu.h></span>
<a name="l00013"></a>00013 <span class="preprocessor">#else</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#include <GL/glu.h></span>
<a name="l00015"></a>00015 <span class="preprocessor">#endif</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span>
<a name="l00017"></a>00017 <span class="preprocessor">#include <allegro/internal/aintern.h></span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="comment">/* GL extension Structure. Holds the extension pointers for a single context */</span>
<a name="l00021"></a>00021 <span class="preprocessor">#define AGL_API(type, name, args) AGL_##name##_t name;</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="keyword">typedef</span> <span class="keyword">struct </span>AGL_EXT {
<a name="l00023"></a>00023 <span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00024"></a>00024 <span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/wgl_ext_api.h"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/glx_ext_api.h"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#endif</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>} AGL_EXT;
<a name="l00030"></a>00030 <span class="preprocessor">#undef AGL_API</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span>
<a name="l00032"></a>00032 <span class="preprocessor">#define PREFIX_I "agl-ext INFO: "</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span><span class="preprocessor">#define PREFIX_W "agl-ext WARNING: "</span>
<a name="l00034"></a>00034 <span class="preprocessor"></span><span class="preprocessor">#define PREFIX_E "agl-ext ERROR: "</span>
<a name="l00035"></a>00035 <span class="preprocessor"></span>
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="comment">/* Current driver info */</span>
<a name="l00038"></a>00038 <span class="keyword">struct </span>allegro_gl_info allegro_gl_info;
<a name="l00039"></a>00039
<a name="l00040"></a>00040
<a name="l00041"></a>00041
<a name="l00055"></a><a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436">00055</a> <span class="keyword">struct </span>AGL_EXTENSION_LIST_GL <a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>;
<a name="l00056"></a>00056
<a name="l00057"></a>00057
<a name="l00058"></a>00058
<a name="l00064"></a>00064 <span class="preprocessor">#ifdef ALLEGRO_UNIX</span>
<a name="l00065"></a>00065 <span class="preprocessor"></span><span class="keyword">struct </span>AGL_EXTENSION_LIST_GLX allegro_gl_extensions_GLX;
<a name="l00066"></a>00066 <span class="preprocessor">#endif</span>
<a name="l00067"></a>00067 <span class="preprocessor"></span>
<a name="l00068"></a>00068
<a name="l00069"></a>00069
<a name="l00075"></a>00075 <span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00076"></a>00076 <span class="preprocessor"></span><span class="keyword">struct </span>AGL_EXTENSION_LIST_WGL allegro_gl_extensions_WGL;
<a name="l00077"></a>00077 <span class="preprocessor">#endif</span>
<a name="l00078"></a>00078 <span class="preprocessor"></span>
<a name="l00079"></a>00079
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="comment">/* Current context */</span>
<a name="l00082"></a><a class="code" href="group__extensions.html#ga2d6ebb26eec58470e4242b750656268b">00082</a> AGL_EXT *<a class="code" href="group__extensions.html#ga2d6ebb26eec58470e4242b750656268b" title="List of GLX extensions supported by AllegroGL.">agl_extension_table</a> = NULL;
<a name="l00083"></a>00083
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="preprocessor">#ifdef ALLEGROGL_GENERIC_DRIVER</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#include "GL/amesa.h"</span>
<a name="l00087"></a>00087 <span class="preprocessor">#endif</span>
<a name="l00088"></a>00088 <span class="preprocessor"></span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="preprocessor">#ifdef ALLEGROGL_HAVE_DYNAMIC_LINK</span>
<a name="l00091"></a>00091 <span class="preprocessor"></span><span class="preprocessor">#include <dlfcn.h></span>
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="comment">/* Handle for dynamic library libGL.so */</span>
<a name="l00094"></a>00094 <span class="keyword">static</span> <span class="keywordtype">void</span>* __agl_handle = NULL;
<a name="l00095"></a>00095 <span class="comment">/* Pointer to glXGetProcAddressARB */</span>
<a name="l00096"></a>00096 <span class="keyword">typedef</span> <span class="keywordtype">void</span>* (*GLXGETPROCADDRESSARBPROC) (<span class="keyword">const</span> GLubyte*);
<a name="l00097"></a>00097 <span class="keyword">static</span> GLXGETPROCADDRESSARBPROC aglXGetProcAddress;
<a name="l00098"></a>00098 <span class="preprocessor">#else</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span><span class="comment">/* Tries static linking */</span>
<a name="l00100"></a>00100 <span class="preprocessor">#ifdef ALLEGROGL_GLXGETPROCADDRESSARB</span>
<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="preprocessor">#define aglXGetProcAddress glXGetProcAddressARB</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span><span class="preprocessor">#define aglXGetProcAddress glXGetProcAddress</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00105"></a>00105 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span>
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00109"></a>00109 <span class="preprocessor"></span><span class="preprocessor">#undef TRUE</span>
<a name="l00110"></a>00110 <span class="preprocessor"></span><span class="preprocessor">#undef FALSE</span>
<a name="l00111"></a>00111 <span class="preprocessor"></span><span class="preprocessor">#include <Carbon/Carbon.h></span>
<a name="l00112"></a>00112 <span class="preprocessor">#undef TRUE</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span><span class="preprocessor">#undef FALSE</span>
<a name="l00114"></a>00114 <span class="preprocessor"></span><span class="preprocessor">#define TRUE -1</span>
<a name="l00115"></a>00115 <span class="preprocessor"></span><span class="preprocessor">#define FALSE 0</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span>
<a name="l00117"></a>00117 <span class="keyword">static</span> CFBundleRef opengl_bundle_ref;
<a name="l00118"></a>00118 <span class="preprocessor">#endif</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span>
<a name="l00120"></a>00120
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">/* Define the GL API pointers */</span>
<a name="l00123"></a>00123 <span class="preprocessor">#define AGL_API(type, name, args) AGL_##name##_t __agl##name = NULL;</span>
<a name="l00124"></a>00124 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00125"></a>00125 <span class="preprocessor">#undef AGL_API</span>
<a name="l00126"></a>00126 <span class="preprocessor"></span><span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00127"></a>00127 <span class="preprocessor"></span><span class="preprocessor">#define AGL_API(type, name, args) AGL_##name##_t __awgl##name = NULL;</span>
<a name="l00128"></a>00128 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/wgl_ext_api.h"</span>
<a name="l00129"></a>00129 <span class="preprocessor">#undef AGL_API</span>
<a name="l00130"></a>00130 <span class="preprocessor"></span><span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00131"></a>00131 <span class="preprocessor"></span><span class="preprocessor">#define AGL_API(type, name, args) AGL_##name##_t __aglX##name = NULL;</span>
<a name="l00132"></a>00132 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/glx_ext_api.h"</span>
<a name="l00133"></a>00133 <span class="preprocessor">#undef AGL_API</span>
<a name="l00134"></a>00134 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span>
<a name="l00136"></a>00136
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="comment">/* Create the extension table */</span>
<a name="l00139"></a>00139 AGL_EXT* __allegro_gl_create_extensions() {
<a name="l00140"></a>00140
<a name="l00141"></a>00141 AGL_EXT *ret = malloc(<span class="keyword">sizeof</span>(AGL_EXT));
<a name="l00142"></a>00142
<a name="l00143"></a>00143 <span class="keywordflow">if</span> (!ret) {
<a name="l00144"></a>00144 <span class="keywordflow">return</span> NULL;
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147 memset(ret, 0, <span class="keyword">sizeof</span>(AGL_EXT));
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="keywordflow">return</span> ret;
<a name="l00150"></a>00150 }
<a name="l00151"></a>00151
<a name="l00152"></a>00152
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="comment">/* Load the extension addresses into the table.</span>
<a name="l00155"></a>00155 <span class="comment"> * Should only be done on context creation.</span>
<a name="l00156"></a>00156 <span class="comment"> */</span>
<a name="l00157"></a>00157 <span class="keywordtype">void</span> __allegro_gl_load_extensions(AGL_EXT *ext) {
<a name="l00158"></a>00158
<a name="l00159"></a>00159 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00160"></a>00160 <span class="preprocessor"></span> CFStringRef function;
<a name="l00161"></a>00161 <span class="preprocessor">#endif</span>
<a name="l00162"></a>00162 <span class="preprocessor"></span>
<a name="l00163"></a>00163 <span class="keywordflow">if</span> (!ext) {
<a name="l00164"></a>00164 <span class="keywordflow">return</span>;
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166 <span class="preprocessor">#ifdef ALLEGRO_UNIX</span>
<a name="l00167"></a>00167 <span class="preprocessor"></span> <span class="keywordflow">if</span> (!aglXGetProcAddress) {
<a name="l00168"></a>00168 <span class="keywordflow">return</span>;
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 <span class="preprocessor">#endif</span>
<a name="l00171"></a>00171 <span class="preprocessor"></span>
<a name="l00172"></a>00172 <span class="preprocessor"># ifdef ALLEGRO_WINDOWS</span>
<a name="l00173"></a>00173 <span class="preprocessor"></span><span class="preprocessor"># define AGL_API(type, name, args) \</span>
<a name="l00174"></a>00174 <span class="preprocessor"> ext->name = (AGL_##name##_t)wglGetProcAddress("gl" #name); \</span>
<a name="l00175"></a>00175 <span class="preprocessor"> if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }</span>
<a name="l00176"></a>00176 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00177"></a>00177 <span class="preprocessor"># undef AGL_API</span>
<a name="l00178"></a>00178 <span class="preprocessor"></span><span class="preprocessor"># define AGL_API(type, name, args) \</span>
<a name="l00179"></a>00179 <span class="preprocessor"> ext->name = (AGL_##name##_t)wglGetProcAddress("wgl" #name); \</span>
<a name="l00180"></a>00180 <span class="preprocessor"> if (ext->name) { AGL_LOG(2,"wgl" #name " successfully loaded\n"); }</span>
<a name="l00181"></a>00181 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/wgl_ext_api.h"</span>
<a name="l00182"></a>00182 <span class="preprocessor"># undef AGL_API</span>
<a name="l00183"></a>00183 <span class="preprocessor"></span><span class="preprocessor"># elif defined ALLEGRO_UNIX</span>
<a name="l00184"></a>00184 <span class="preprocessor"></span><span class="preprocessor"># define AGL_API(type, name, args) \</span>
<a name="l00185"></a>00185 <span class="preprocessor"> ext->name = (AGL_##name##_t)aglXGetProcAddress((const GLubyte*)"gl" #name); \</span>
<a name="l00186"></a>00186 <span class="preprocessor"> if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }</span>
<a name="l00187"></a>00187 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00188"></a>00188 <span class="preprocessor"># undef AGL_API</span>
<a name="l00189"></a>00189 <span class="preprocessor"></span><span class="preprocessor"># define AGL_API(type, name, args) \</span>
<a name="l00190"></a>00190 <span class="preprocessor"> ext->name = (AGL_##name##_t)aglXGetProcAddress((const GLubyte*)"glX" #name); \</span>
<a name="l00191"></a>00191 <span class="preprocessor"> if (ext->name) { AGL_LOG(2,"glX" #name " successfully loaded\n"); }</span>
<a name="l00192"></a>00192 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/glx_ext_api.h"</span>
<a name="l00193"></a>00193 <span class="preprocessor"># undef AGL_API</span>
<a name="l00194"></a>00194 <span class="preprocessor"></span><span class="preprocessor"># elif defined ALLEGRO_MACOSX</span>
<a name="l00195"></a>00195 <span class="preprocessor"></span><span class="preprocessor"># define AGL_API(type, name, args) \</span>
<a name="l00196"></a>00196 <span class="preprocessor"> function = CFStringCreateWithCString(kCFAllocatorDefault, "gl" #name, \</span>
<a name="l00197"></a>00197 <span class="preprocessor"> kCFStringEncodingASCII); \</span>
<a name="l00198"></a>00198 <span class="preprocessor"> if (function) { \</span>
<a name="l00199"></a>00199 <span class="preprocessor"> ext->name = (AGL_##name##_t)CFBundleGetFunctionPointerForName( \</span>
<a name="l00200"></a>00200 <span class="preprocessor"> opengl_bundle_ref, function); \</span>
<a name="l00201"></a>00201 <span class="preprocessor"> CFRelease(function); \</span>
<a name="l00202"></a>00202 <span class="preprocessor"> } \</span>
<a name="l00203"></a>00203 <span class="preprocessor"> if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }</span>
<a name="l00204"></a>00204 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00205"></a>00205 <span class="preprocessor"># undef AGL_API</span>
<a name="l00206"></a>00206 <span class="preprocessor"></span><span class="preprocessor"># endif</span>
<a name="l00207"></a>00207 <span class="preprocessor"></span>}
<a name="l00208"></a>00208
<a name="l00209"></a>00209
<a name="l00210"></a>00210
<a name="l00211"></a>00211 <span class="comment">/* Set the GL API pointers to the current table </span>
<a name="l00212"></a>00212 <span class="comment"> * Should only be called on context switches.</span>
<a name="l00213"></a>00213 <span class="comment"> */</span>
<a name="l00214"></a>00214 <span class="keywordtype">void</span> __allegro_gl_set_extensions(AGL_EXT *ext) {
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="keywordflow">if</span> (!ext) {
<a name="l00217"></a>00217 <span class="keywordflow">return</span>;
<a name="l00218"></a>00218 }
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="preprocessor">#define AGL_API(type, name, args) __agl##name = ext->name;</span>
<a name="l00221"></a>00221 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_api.h"</span>
<a name="l00222"></a>00222 <span class="preprocessor">#undef AGL_API</span>
<a name="l00223"></a>00223 <span class="preprocessor"></span><span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00224"></a>00224 <span class="preprocessor"></span><span class="preprocessor">#define AGL_API(type, name, args) __awgl##name = ext->name;</span>
<a name="l00225"></a>00225 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/wgl_ext_api.h"</span>
<a name="l00226"></a>00226 <span class="preprocessor">#undef AGL_API</span>
<a name="l00227"></a>00227 <span class="preprocessor"></span><span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00228"></a>00228 <span class="preprocessor"></span><span class="preprocessor">#define AGL_API(type, name, args) __aglX##name = ext->name;</span>
<a name="l00229"></a>00229 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/glx_ext_api.h"</span>
<a name="l00230"></a>00230 <span class="preprocessor">#undef AGL_API</span>
<a name="l00231"></a>00231 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00232"></a>00232 <span class="preprocessor"></span>}
<a name="l00233"></a>00233
<a name="l00234"></a>00234
<a name="l00235"></a>00235
<a name="l00236"></a>00236 <span class="comment">/* Destroys the extension table */</span>
<a name="l00237"></a>00237 <span class="keywordtype">void</span> __allegro_gl_destroy_extensions(AGL_EXT *ext) {
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="keywordflow">if</span> (ext) {
<a name="l00240"></a>00240 <span class="keywordflow">if</span> (ext == agl_extension_table) {
<a name="l00241"></a>00241 agl_extension_table = NULL;
<a name="l00242"></a>00242 }
<a name="l00243"></a>00243 free(ext);
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245 }
<a name="l00246"></a>00246
<a name="l00247"></a>00247
<a name="l00248"></a>00248
<a name="l00249"></a>00249 <span class="comment">/* __allegro_gl_look_for_an_extension:</span>
<a name="l00250"></a>00250 <span class="comment"> * This function has been written by Mark J. Kilgard in one of his</span>
<a name="l00251"></a>00251 <span class="comment"> * tutorials about OpenGL extensions</span>
<a name="l00252"></a>00252 <span class="comment"> */</span>
<a name="l00253"></a>00253 <span class="keywordtype">int</span> __allegro_gl_look_for_an_extension(AL_CONST <span class="keywordtype">char</span> *name,
<a name="l00254"></a>00254 AL_CONST GLubyte * extensions)
<a name="l00255"></a>00255 {
<a name="l00256"></a>00256 AL_CONST GLubyte *start;
<a name="l00257"></a>00257 GLubyte *where, *terminator;
<a name="l00258"></a>00258
<a name="l00259"></a>00259 <span class="comment">/* Extension names should not have spaces. */</span>
<a name="l00260"></a>00260 where = (GLubyte *) strchr(name, <span class="charliteral">' '</span>);
<a name="l00261"></a>00261 <span class="keywordflow">if</span> (where || *name == <span class="charliteral">'\0'</span>)
<a name="l00262"></a>00262 <span class="keywordflow">return</span> FALSE;
<a name="l00263"></a>00263 <span class="comment">/* It takes a bit of care to be fool-proof about parsing the</span>
<a name="l00264"></a>00264 <span class="comment"> * OpenGL extensions string. Don't be fooled by sub-strings, etc.</span>
<a name="l00265"></a>00265 <span class="comment"> */</span>
<a name="l00266"></a>00266 start = extensions;
<a name="l00267"></a>00267 <span class="keywordflow">for</span> (;;) {
<a name="l00268"></a>00268 where = (GLubyte *) strstr((AL_CONST <span class="keywordtype">char</span> *) start, name);
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (!where)
<a name="l00270"></a>00270 <span class="keywordflow">break</span>;
<a name="l00271"></a>00271 terminator = where + strlen(name);
<a name="l00272"></a>00272 <span class="keywordflow">if</span> (where == start || *(where - 1) == <span class="charliteral">' '</span>)
<a name="l00273"></a>00273 <span class="keywordflow">if</span> (*terminator == <span class="charliteral">' '</span> || *terminator == <span class="charliteral">'\0'</span>)
<a name="l00274"></a>00274 <span class="keywordflow">return</span> TRUE;
<a name="l00275"></a>00275 start = terminator;
<a name="l00276"></a>00276 }
<a name="l00277"></a>00277 <span class="keywordflow">return</span> FALSE;
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279
<a name="l00280"></a>00280
<a name="l00281"></a>00281
<a name="l00282"></a>00282 <span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00283"></a>00283 <span class="preprocessor"></span><span class="keyword">static</span> AGL_GetExtensionsStringARB_t __wglGetExtensionsStringARB = NULL;
<a name="l00284"></a>00284 <span class="keyword">static</span> HDC __hdc = NULL;
<a name="l00285"></a>00285 <span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00286"></a>00286 <span class="preprocessor"></span><span class="preprocessor">#include <xalleg.h></span>
<a name="l00287"></a>00287 <span class="preprocessor">#endif</span>
<a name="l00288"></a>00288 <span class="preprocessor"></span>
<a name="l00289"></a>00289
<a name="l00290"></a>00290 <span class="comment">/* int allegro_gl_is_extension_supported(AL_CONST char *extension) */</span>
<a name="l00306"></a><a class="code" href="group__extensions.html#ga7351f56ea1c4f4665193fc3bf547ff0a">00306</a> <span class="keywordtype">int</span> <a class="code" href="group__extensions.html#ga7351f56ea1c4f4665193fc3bf547ff0a" title="This function is an helper to determine whether an OpenGL extension is available or not...">allegro_gl_is_extension_supported</a>(AL_CONST <span class="keywordtype">char</span> *extension)
<a name="l00307"></a>00307 {
<a name="l00308"></a>00308 <span class="keywordtype">int</span> ret;
<a name="l00309"></a>00309
<a name="l00310"></a>00310 <span class="keywordflow">if</span> (!__allegro_gl_valid_context)
<a name="l00311"></a>00311 <span class="keywordflow">return</span> FALSE;
<a name="l00312"></a>00312
<a name="l00313"></a>00313 <span class="keywordflow">if</span> (!glGetString(GL_EXTENSIONS))
<a name="l00314"></a>00314 <span class="keywordflow">return</span> FALSE;
<a name="l00315"></a>00315
<a name="l00316"></a>00316 ret = __allegro_gl_look_for_an_extension(extension,
<a name="l00317"></a>00317 glGetString(GL_EXTENSIONS));
<a name="l00318"></a>00318
<a name="l00319"></a>00319 <span class="preprocessor">#ifdef ALLEGRO_WINDOWS</span>
<a name="l00320"></a>00320 <span class="preprocessor"></span> <span class="keywordflow">if</span> (!ret && strncmp(extension, <span class="stringliteral">"WGL"</span>, 3) == 0) {
<a name="l00321"></a>00321 <span class="keywordflow">if</span> (!__wglGetExtensionsStringARB || __hdc != __allegro_gl_hdc) {
<a name="l00322"></a>00322 __wglGetExtensionsStringARB = (AGL_GetExtensionsStringARB_t)
<a name="l00323"></a>00323 wglGetProcAddress(<span class="stringliteral">"wglGetExtensionsStringARB"</span>);
<a name="l00324"></a>00324 __hdc = __allegro_gl_hdc;
<a name="l00325"></a>00325 }
<a name="l00326"></a>00326 <span class="keywordflow">if</span> (__wglGetExtensionsStringARB) {
<a name="l00327"></a>00327 ret = __allegro_gl_look_for_an_extension(extension,
<a name="l00328"></a>00328 (AL_CONST GLubyte*)__wglGetExtensionsStringARB(__allegro_gl_hdc));
<a name="l00329"></a>00329 }
<a name="l00330"></a>00330 }
<a name="l00331"></a>00331 <span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00332"></a>00332 <span class="preprocessor"></span> <span class="keywordflow">if</span> (!ret && strncmp(extension, <span class="stringliteral">"GLX"</span>, 3) == 0) {
<a name="l00333"></a>00333 XLOCK();
<a name="l00334"></a>00334 ret = __allegro_gl_look_for_an_extension(extension,
<a name="l00335"></a>00335 (<span class="keyword">const</span> GLubyte*)glXQueryExtensionsString(_xwin.display,
<a name="l00336"></a>00336 _xwin.screen));
<a name="l00337"></a>00337 XUNLOCK();
<a name="l00338"></a>00338 }
<a name="l00339"></a>00339 <span class="preprocessor">#endif</span>
<a name="l00340"></a>00340 <span class="preprocessor"></span>
<a name="l00341"></a>00341 <span class="keywordflow">return</span> ret;
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343
<a name="l00344"></a>00344
<a name="l00345"></a>00345
<a name="l00346"></a>00346 <span class="comment">/* void * allegro_gl_get_proc_address(AL_CONST char *name) */</span>
<a name="l00372"></a><a class="code" href="group__extensions.html#gaa0c2cd7c4b4a94e8801af42a58356cc4">00372</a> <span class="keywordtype">void</span> *<a class="code" href="group__extensions.html#gaa0c2cd7c4b4a94e8801af42a58356cc4" title="Helper to get the address of an OpenGL symbol.">allegro_gl_get_proc_address</a>(AL_CONST <span class="keywordtype">char</span> *name)
<a name="l00373"></a>00373 {
<a name="l00374"></a>00374 <span class="keywordtype">void</span> *symbol = NULL;
<a name="l00375"></a>00375 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00376"></a>00376 <span class="preprocessor"></span> CFStringRef function;
<a name="l00377"></a>00377 <span class="preprocessor">#endif</span>
<a name="l00378"></a>00378 <span class="preprocessor"></span>
<a name="l00379"></a>00379 <span class="keywordflow">if</span> (!__allegro_gl_valid_context)
<a name="l00380"></a>00380 <span class="keywordflow">return</span> NULL;
<a name="l00381"></a>00381
<a name="l00382"></a>00382 <span class="preprocessor">#ifdef ALLEGROGL_GENERIC_DRIVER</span>
<a name="l00383"></a>00383 <span class="preprocessor"></span> <span class="comment">/* AMesa provides a function to get a proc address. It does</span>
<a name="l00384"></a>00384 <span class="comment"> * not emulate dynamic linking of course...</span>
<a name="l00385"></a>00385 <span class="comment"> */</span>
<a name="l00386"></a>00386 symbol = AMesaGetProcAddress(name);
<a name="l00387"></a>00387
<a name="l00388"></a>00388 <span class="preprocessor">#elif defined ALLEGRO_WINDOWS</span>
<a name="l00389"></a>00389 <span class="preprocessor"></span> <span class="comment">/* For once Windows is the easiest platform to use :)</span>
<a name="l00390"></a>00390 <span class="comment"> * It provides a standardized way to get a function address</span>
<a name="l00391"></a>00391 <span class="comment"> * But of course there is a drawback : the symbol is only valid</span>
<a name="l00392"></a>00392 <span class="comment"> * under the current context :P</span>
<a name="l00393"></a>00393 <span class="comment"> */</span>
<a name="l00394"></a>00394 symbol = wglGetProcAddress(name);
<a name="l00395"></a>00395 <span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00396"></a>00396 <span class="preprocessor"></span> <span class="keywordflow">if</span> (aglXGetProcAddress) {
<a name="l00397"></a>00397 <span class="comment">/* This is definitely the *good* way on Unix to get a GL proc</span>
<a name="l00398"></a>00398 <span class="comment"> * address. Unfortunately glXGetProcAddress is an extension</span>
<a name="l00399"></a>00399 <span class="comment"> * and may not be available on all platforms</span>
<a name="l00400"></a>00400 <span class="comment"> */</span>
<a name="l00401"></a>00401 symbol = aglXGetProcAddress((<span class="keyword">const</span> GLubyte*)name);
<a name="l00402"></a>00402 }
<a name="l00403"></a>00403 <span class="preprocessor">#elif defined ALLEGROGL_HAVE_DYNAMIC_LINK</span>
<a name="l00404"></a>00404 <span class="preprocessor"></span> <span class="keywordflow">else</span> {
<a name="l00405"></a>00405 <span class="comment">/* Hack if glXGetProcAddress is not available :</span>
<a name="l00406"></a>00406 <span class="comment"> * we try to find the symbol into libGL.so</span>
<a name="l00407"></a>00407 <span class="comment"> */</span>
<a name="l00408"></a>00408 <span class="keywordflow">if</span> (__agl_handle) {
<a name="l00409"></a>00409 symbol = dlsym(__agl_handle, name);
<a name="l00410"></a>00410 }
<a name="l00411"></a>00411 }
<a name="l00412"></a>00412 <span class="preprocessor">#elif defined ALLEGRO_MACOSX</span>
<a name="l00413"></a>00413 <span class="preprocessor"></span> function = CFStringCreateWithCString(kCFAllocatorDefault, name,
<a name="l00414"></a>00414 kCFStringEncodingASCII);
<a name="l00415"></a>00415 <span class="keywordflow">if</span> (function) {
<a name="l00416"></a>00416 symbol = CFBundleGetFunctionPointerForName(opengl_bundle_ref, function);
<a name="l00417"></a>00417 CFRelease(function);
<a name="l00418"></a>00418 }
<a name="l00419"></a>00419 <span class="preprocessor">#else</span>
<a name="l00420"></a>00420 <span class="preprocessor"></span> <span class="comment">/* DOS does not support dynamic linking. If the function is not</span>
<a name="l00421"></a>00421 <span class="comment"> * available at build-time then it will not be available at run-time</span>
<a name="l00422"></a>00422 <span class="comment"> * Therefore we do not need to look for it...</span>
<a name="l00423"></a>00423 <span class="comment"> */</span>
<a name="l00424"></a>00424 <span class="preprocessor">#endif</span>
<a name="l00425"></a>00425 <span class="preprocessor"></span>
<a name="l00426"></a>00426 <span class="keywordflow">if</span> (!symbol) {
<a name="l00427"></a>00427
<a name="l00428"></a>00428 <span class="preprocessor">#if defined ALLEGROGL_HAVE_DYNAMIC_LINK</span>
<a name="l00429"></a>00429 <span class="preprocessor"></span> <span class="keywordflow">if</span> (!aglXGetProcAddress) {
<a name="l00430"></a>00430 TRACE(PREFIX_W <span class="stringliteral">"get_proc_address: libdl::dlsym: %s\n"</span>,
<a name="l00431"></a>00431 dlerror());
<a name="l00432"></a>00432 }
<a name="l00433"></a>00433 <span class="preprocessor">#endif</span>
<a name="l00434"></a>00434 <span class="preprocessor"></span>
<a name="l00435"></a>00435 TRACE(PREFIX_W <span class="stringliteral">"get_proc_address : Unable to load symbol %s\n"</span>,
<a name="l00436"></a>00436 name);
<a name="l00437"></a>00437 }
<a name="l00438"></a>00438 <span class="keywordflow">else</span> {
<a name="l00439"></a>00439 TRACE(PREFIX_I <span class="stringliteral">"get_proc_address : Symbol %s successfully loaded\n"</span>,
<a name="l00440"></a>00440 name);
<a name="l00441"></a>00441 }
<a name="l00442"></a>00442 <span class="keywordflow">return</span> symbol;
<a name="l00443"></a>00443 }
<a name="l00444"></a>00444
<a name="l00445"></a>00445
<a name="l00446"></a>00446
<a name="l00447"></a>00447 <span class="comment">/* Fills in the AllegroGL info struct for blacklisting video cards.</span>
<a name="l00448"></a>00448 <span class="comment"> */</span>
<a name="l00449"></a>00449 <span class="keyword">static</span> <span class="keywordtype">void</span> __fill_in_info_struct(<span class="keyword">const</span> GLubyte *rendereru,
<a name="l00450"></a>00450 <span class="keyword">struct</span> allegro_gl_info *info) {
<a name="l00451"></a>00451 <span class="keyword">const</span> <span class="keywordtype">char</span> *renderer = (<span class="keyword">const</span> <span class="keywordtype">char</span>*)rendereru;
<a name="l00452"></a>00452
<a name="l00453"></a>00453 <span class="comment">/* Some cards are "special"... */</span>
<a name="l00454"></a>00454 <span class="keywordflow">if</span> (strstr(renderer, <span class="stringliteral">"3Dfx/Voodoo"</span>)) {
<a name="l00455"></a>00455 info->is_voodoo = 1;
<a name="l00456"></a>00456 }
<a name="l00457"></a>00457 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strstr(renderer, <span class="stringliteral">"Matrox G200"</span>)) {
<a name="l00458"></a>00458 info->is_matrox_g200 = 1;
<a name="l00459"></a>00459 }
<a name="l00460"></a>00460 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strstr(renderer, <span class="stringliteral">"RagePRO"</span>)) {
<a name="l00461"></a>00461 info->is_ati_rage_pro = 1;
<a name="l00462"></a>00462 }
<a name="l00463"></a>00463 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strstr(renderer, <span class="stringliteral">"RADEON 7000"</span>)) {
<a name="l00464"></a>00464 info->is_ati_radeon_7000 = 1;
<a name="l00465"></a>00465 }
<a name="l00466"></a>00466 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strstr(renderer, <span class="stringliteral">"Mesa DRI R200"</span>)) {
<a name="l00467"></a>00467 info->is_ati_r200_chip = 1;
<a name="l00468"></a>00468 }
<a name="l00469"></a>00469
<a name="l00470"></a>00470 <span class="keywordflow">if</span> ((strncmp(renderer, <span class="stringliteral">"3Dfx/Voodoo3 "</span>, 13) == 0)
<a name="l00471"></a>00471 || (strncmp(renderer, <span class="stringliteral">"3Dfx/Voodoo2 "</span>, 13) == 0)
<a name="l00472"></a>00472 || (strncmp(renderer, <span class="stringliteral">"3Dfx/Voodoo "</span>, 12) == 0)) {
<a name="l00473"></a>00473 info->is_voodoo3_and_under = 1;
<a name="l00474"></a>00474 }
<a name="l00475"></a>00475
<a name="l00476"></a>00476 <span class="comment">/* Read OpenGL properties */</span>
<a name="l00477"></a>00477 info->version = <a class="code" href="group__core.html#ga444d507eaeb5ba800787f6a81827615d" title="Returns the OpenGL version number of the client (the computer the program is running on)...">allegro_gl_opengl_version</a>();
<a name="l00478"></a>00478
<a name="l00479"></a>00479 <span class="keywordflow">return</span>;
<a name="l00480"></a>00480 }
<a name="l00481"></a>00481
<a name="l00482"></a>00482
<a name="l00483"></a>00483
<a name="l00484"></a>00484 <span class="comment">/* __allegro_gl_manage_extensions:</span>
<a name="l00485"></a>00485 <span class="comment"> * This functions fills the __allegro_gl_extensions structure and displays</span>
<a name="l00486"></a>00486 <span class="comment"> * on the log file which extensions are available</span>
<a name="l00487"></a>00487 <span class="comment"> */</span>
<a name="l00488"></a>00488 <span class="keywordtype">void</span> __allegro_gl_manage_extensions(<span class="keywordtype">void</span>)
<a name="l00489"></a>00489 {
<a name="l00490"></a>00490 AL_CONST GLubyte *buf;
<a name="l00491"></a>00491 <span class="keywordtype">int</span> i;
<a name="l00492"></a>00492
<a name="l00493"></a>00493 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00494"></a>00494 <span class="preprocessor"></span> CFURLRef bundle_url;
<a name="l00495"></a>00495 <span class="preprocessor">#endif</span>
<a name="l00496"></a>00496 <span class="preprocessor"></span>
<a name="l00497"></a>00497 <span class="comment">/* Print out OpenGL extensions */</span>
<a name="l00498"></a>00498 <span class="preprocessor">#if LOGLEVEL >= 1</span>
<a name="l00499"></a>00499 <span class="preprocessor"></span> AGL_LOG(1, <span class="stringliteral">"OpenGL Extensions:\n"</span>);
<a name="l00500"></a>00500 __allegro_gl_print_extensions((AL_CONST <span class="keywordtype">char</span>*)
<a name="l00501"></a>00501 glGetString(GL_EXTENSIONS));
<a name="l00502"></a>00502 <span class="preprocessor">#endif</span>
<a name="l00503"></a>00503 <span class="preprocessor"></span>
<a name="l00504"></a>00504 <span class="comment">/* Print out GLU version */</span>
<a name="l00505"></a>00505 buf = gluGetString(GLU_VERSION);
<a name="l00506"></a>00506 TRACE(PREFIX_I <span class="stringliteral">"GLU Version : %s\n"</span>, buf);
<a name="l00507"></a>00507
<a name="l00508"></a>00508 <span class="preprocessor">#ifdef ALLEGROGL_HAVE_DYNAMIC_LINK</span>
<a name="l00509"></a>00509 <span class="preprocessor"></span> <span class="comment">/* Get glXGetProcAddress entry */</span>
<a name="l00510"></a>00510 __agl_handle = dlopen(<span class="stringliteral">"libGL.so"</span>, RTLD_LAZY);
<a name="l00511"></a>00511 <span class="keywordflow">if</span> (__agl_handle) {
<a name="l00512"></a>00512 aglXGetProcAddress = (GLXGETPROCADDRESSARBPROC) dlsym(__agl_handle,
<a name="l00513"></a>00513 <span class="stringliteral">"glXGetProcAddressARB"</span>);
<a name="l00514"></a>00514 <span class="keywordflow">if</span> (!aglXGetProcAddress) {
<a name="l00515"></a>00515 aglXGetProcAddress = (GLXGETPROCADDRESSARBPROC) dlsym(__agl_handle,
<a name="l00516"></a>00516 <span class="stringliteral">"glXGetProcAddress"</span>);
<a name="l00517"></a>00517 }
<a name="l00518"></a>00518 }
<a name="l00519"></a>00519 <span class="keywordflow">else</span> {
<a name="l00520"></a>00520 TRACE(PREFIX_W <span class="stringliteral">"Failed to dlopen libGL.so : %s\n"</span>, dlerror());
<a name="l00521"></a>00521 }
<a name="l00522"></a>00522 TRACE(PREFIX_I <span class="stringliteral">"glXGetProcAddress Extension: %s\n"</span>,
<a name="l00523"></a>00523 aglXGetProcAddress ? <span class="stringliteral">"Supported"</span> : <span class="stringliteral">"Unsupported"</span>);
<a name="l00524"></a>00524 <span class="preprocessor">#elif defined ALLEGRO_UNIX</span>
<a name="l00525"></a>00525 <span class="preprocessor"></span><span class="preprocessor">#ifdef ALLEGROGL_GLXGETPROCADDRESSARB</span>
<a name="l00526"></a>00526 <span class="preprocessor"></span> TRACE(PREFIX_I <span class="stringliteral">"glXGetProcAddressARB Extension: supported\n"</span>);
<a name="l00527"></a>00527 <span class="preprocessor">#else</span>
<a name="l00528"></a>00528 <span class="preprocessor"></span> TRACE(PREFIX_I <span class="stringliteral">"glXGetProcAddress Extension: supported\n"</span>);
<a name="l00529"></a>00529 <span class="preprocessor">#endif</span>
<a name="l00530"></a>00530 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00531"></a>00531 <span class="preprocessor"></span>
<a name="l00532"></a>00532 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00533"></a>00533 <span class="preprocessor"></span> bundle_url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
<a name="l00534"></a>00534 CFSTR(<span class="stringliteral">"/System/Library/Frameworks/OpenGL.framework"</span>),
<a name="l00535"></a>00535 kCFURLPOSIXPathStyle, <span class="keyword">true</span>);
<a name="l00536"></a>00536 opengl_bundle_ref = CFBundleCreate(kCFAllocatorDefault, bundle_url);
<a name="l00537"></a>00537 CFRelease(bundle_url);
<a name="l00538"></a>00538 <span class="preprocessor">#endif</span>
<a name="l00539"></a>00539 <span class="preprocessor"></span>
<a name="l00540"></a>00540 __fill_in_info_struct(glGetString(GL_RENDERER), &allegro_gl_info);
<a name="l00541"></a>00541
<a name="l00542"></a>00542 <span class="comment">/* Load extensions */</span>
<a name="l00543"></a>00543 agl_extension_table = __allegro_gl_create_extensions();
<a name="l00544"></a>00544 __allegro_gl_load_extensions(agl_extension_table);
<a name="l00545"></a>00545 __allegro_gl_set_extensions(agl_extension_table);
<a name="l00546"></a>00546
<a name="l00547"></a>00547 <span class="keywordflow">for</span> (i = 0; i < 5; i++) {
<a name="l00548"></a>00548 __allegro_gl_texture_read_format[i] = -1;
<a name="l00549"></a>00549 __allegro_gl_texture_components[i] = GL_RGB;
<a name="l00550"></a>00550 }
<a name="l00551"></a>00551 __allegro_gl_texture_read_format[3] = GL_UNSIGNED_BYTE;
<a name="l00552"></a>00552 __allegro_gl_texture_read_format[4] = GL_UNSIGNED_BYTE;
<a name="l00553"></a>00553 __allegro_gl_texture_components[4] = GL_RGBA;
<a name="l00554"></a>00554
<a name="l00555"></a>00555
<a name="l00556"></a>00556 <span class="comment">/* Get extension info for the rest of the lib */</span>
<a name="l00557"></a>00557 <span class="preprocessor"># define AGL_EXT(name, ver) { \</span>
<a name="l00558"></a>00558 <span class="preprocessor"> allegro_gl_extensions_GL.name = \</span>
<a name="l00559"></a>00559 <span class="preprocessor"> allegro_gl_is_extension_supported("GL_" #name) \</span>
<a name="l00560"></a>00560 <span class="preprocessor"> || (allegro_gl_info.version >= ver && ver > 0); \</span>
<a name="l00561"></a>00561 <span class="preprocessor"> }</span>
<a name="l00562"></a>00562 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/gl_ext_list.h"</span>
<a name="l00563"></a>00563 <span class="preprocessor"># undef AGL_EXT</span>
<a name="l00564"></a>00564 <span class="preprocessor"></span>
<a name="l00565"></a>00565 <span class="preprocessor">#ifdef ALLEGRO_UNIX</span>
<a name="l00566"></a>00566 <span class="preprocessor"></span><span class="preprocessor"># define AGL_EXT(name, ver) { \</span>
<a name="l00567"></a>00567 <span class="preprocessor"> allegro_gl_extensions_GLX.name = \</span>
<a name="l00568"></a>00568 <span class="preprocessor"> allegro_gl_is_extension_supported("GLX_" #name) \</span>
<a name="l00569"></a>00569 <span class="preprocessor"> || (allegro_gl_info.version >= ver && ver > 0); \</span>
<a name="l00570"></a>00570 <span class="preprocessor"> }</span>
<a name="l00571"></a>00571 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/glx_ext_list.h"</span>
<a name="l00572"></a>00572 <span class="preprocessor"># undef AGL_EXT</span>
<a name="l00573"></a>00573 <span class="preprocessor"></span><span class="preprocessor">#elif defined ALLEGRO_WINDOWS</span>
<a name="l00574"></a>00574 <span class="preprocessor"></span><span class="preprocessor"># define AGL_EXT(name, ver) { \</span>
<a name="l00575"></a>00575 <span class="preprocessor"> allegro_gl_extensions_WGL.name = \</span>
<a name="l00576"></a>00576 <span class="preprocessor"> allegro_gl_is_extension_supported("WGL_" #name) \</span>
<a name="l00577"></a>00577 <span class="preprocessor"> || (allegro_gl_info.version >= ver && ver > 0); \</span>
<a name="l00578"></a>00578 <span class="preprocessor"> }</span>
<a name="l00579"></a>00579 <span class="preprocessor"></span><span class="preprocessor"># include "allegrogl/GLext/wgl_ext_list.h"</span>
<a name="l00580"></a>00580 <span class="preprocessor"># undef AGL_EXT</span>
<a name="l00581"></a>00581 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00582"></a>00582 <span class="preprocessor"></span>
<a name="l00583"></a>00583 <span class="comment">/* Get number of texture units */</span>
<a name="l00584"></a>00584 <span class="keywordflow">if</span> (<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.ARB_multitexture) {
<a name="l00585"></a>00585 glGetIntegerv(GL_MAX_TEXTURE_UNITS,
<a name="l00586"></a>00586 (GLint*)&allegro_gl_info.num_texture_units);
<a name="l00587"></a>00587 }
<a name="l00588"></a>00588 <span class="keywordflow">else</span> {
<a name="l00589"></a>00589 allegro_gl_info.num_texture_units = 1;
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591
<a name="l00592"></a>00592 <span class="comment">/* Get max texture size */</span>
<a name="l00593"></a>00593 glGetIntegerv(GL_MAX_TEXTURE_SIZE,
<a name="l00594"></a>00594 (GLint*)&allegro_gl_info.max_texture_size);
<a name="l00595"></a>00595
<a name="l00596"></a>00596 <span class="comment">/* Note: Voodoo (even V5) don't seem to correctly support</span>
<a name="l00597"></a>00597 <span class="comment"> * packed pixel formats. Disabling them for those cards.</span>
<a name="l00598"></a>00598 <span class="comment"> */</span>
<a name="l00599"></a>00599 <a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.EXT_packed_pixels &= !allegro_gl_info.is_voodoo;
<a name="l00600"></a>00600
<a name="l00601"></a>00601
<a name="l00602"></a>00602 <span class="keywordflow">if</span> (<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.EXT_packed_pixels) {
<a name="l00603"></a>00603
<a name="l00604"></a>00604 AGL_LOG(1, <span class="stringliteral">"Packed Pixels formats available\n"</span>);
<a name="l00605"></a>00605
<a name="l00606"></a>00606 <span class="comment">/* XXX On NV cards, we want to use BGRA instead of RGBA for speed */</span>
<a name="l00607"></a>00607 <span class="comment">/* Fills the __allegro_gl_texture_format array */</span>
<a name="l00608"></a>00608 __allegro_gl_texture_read_format[0] = GL_UNSIGNED_BYTE_3_3_2;
<a name="l00609"></a>00609 __allegro_gl_texture_read_format[1] = GL_UNSIGNED_SHORT_5_5_5_1;
<a name="l00610"></a>00610 __allegro_gl_texture_read_format[2] = GL_UNSIGNED_SHORT_5_6_5;
<a name="l00611"></a>00611 }
<a name="l00612"></a>00612
<a name="l00613"></a>00613 <span class="comment">/* NVidia and ATI cards expose OpenGL 2.0 but often don't accelerate</span>
<a name="l00614"></a>00614 <span class="comment"> * non-power-of-2 textures. This check is how you verify that NP2</span>
<a name="l00615"></a>00615 <span class="comment"> * textures are hardware accelerated or not.</span>
<a name="l00616"></a>00616 <span class="comment"> * We should clobber the NPOT support if it's not accelerated.</span>
<a name="l00617"></a>00617 <span class="comment"> */</span>
<a name="l00618"></a>00618 { <span class="keyword">const</span> <span class="keywordtype">char</span> *vendor = (<span class="keyword">const</span> <span class="keywordtype">char</span>*)glGetString(GL_VENDOR);
<a name="l00619"></a>00619 <span class="keywordflow">if</span> (strstr(vendor, <span class="stringliteral">"NVIDIA Corporation"</span>)) {
<a name="l00620"></a>00620 <span class="keywordflow">if</span> (!<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.NV_fragment_program2
<a name="l00621"></a>00621 || !<a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.NV_vertex_program3) {
<a name="l00622"></a>00622 <a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.ARB_texture_non_power_of_two = 0;
<a name="l00623"></a>00623 }
<a name="l00624"></a>00624 }
<a name="l00625"></a>00625 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (strstr(vendor, <span class="stringliteral">"ATI Technologies"</span>)) {
<a name="l00626"></a>00626 <span class="keywordflow">if</span> (!strstr((<span class="keyword">const</span> <span class="keywordtype">char</span>*)glGetString(GL_EXTENSIONS),
<a name="l00627"></a>00627 <span class="stringliteral">"GL_ARB_texture_non_power_of_two"</span>)
<a name="l00628"></a>00628 && allegro_gl_info.version >= 2.0f) {
<a name="l00629"></a>00629 <a class="code" href="group__extensions.html#ga7492f6f6acc608789210560ee63e5436" title="List of OpenGL extensions supported by AllegroGL.">allegro_gl_extensions_GL</a>.ARB_texture_non_power_of_two = 0;
<a name="l00630"></a>00630 }
<a name="l00631"></a>00631 }
<a name="l00632"></a>00632 }
<a name="l00633"></a>00633 }
<a name="l00634"></a>00634
<a name="l00635"></a>00635
<a name="l00636"></a>00636
<a name="l00637"></a>00637 <span class="comment">/* __allegro_gl_print_extensions:</span>
<a name="l00638"></a>00638 <span class="comment"> * Given a string containing extensions (i.e. a NULL terminated string where</span>
<a name="l00639"></a>00639 <span class="comment"> * each extension are separated by a space and which names do not contain any</span>
<a name="l00640"></a>00640 <span class="comment"> * space)</span>
<a name="l00641"></a>00641 <span class="comment"> */</span>
<a name="l00642"></a>00642 <span class="keywordtype">void</span> __allegro_gl_print_extensions(AL_CONST <span class="keywordtype">char</span> * extension)
<a name="l00643"></a>00643 {
<a name="l00644"></a>00644 <span class="keywordtype">char</span> buf[80];
<a name="l00645"></a>00645 <span class="keywordtype">char</span>* start;
<a name="l00646"></a>00646
<a name="l00647"></a>00647 <span class="keywordflow">while</span> (*extension != <span class="charliteral">'\0'</span>) {
<a name="l00648"></a>00648 start = buf;
<a name="l00649"></a>00649 strncpy(buf, extension, 80);
<a name="l00650"></a>00650 <span class="keywordflow">while</span> ((*start != <span class="charliteral">' '</span>) && (*start != <span class="charliteral">'\0'</span>)) {
<a name="l00651"></a>00651 extension++;
<a name="l00652"></a>00652 start++;
<a name="l00653"></a>00653 }
<a name="l00654"></a>00654 *start = <span class="charliteral">'\0'</span>;
<a name="l00655"></a>00655 extension ++;
<a name="l00656"></a>00656 TRACE(PREFIX_I <span class="stringliteral">"%s\n"</span>, buf);
<a name="l00657"></a>00657 }
<a name="l00658"></a>00658 }
<a name="l00659"></a>00659
<a name="l00660"></a>00660
<a name="l00661"></a>00661
<a name="l00662"></a>00662 <span class="keywordtype">void</span> __allegro_gl_unmanage_extensions() {
<a name="l00663"></a>00663 __allegro_gl_destroy_extensions(agl_extension_table);
<a name="l00664"></a>00664 <span class="preprocessor">#ifdef ALLEGRO_MACOSX</span>
<a name="l00665"></a>00665 <span class="preprocessor"></span> CFRelease(opengl_bundle_ref);
<a name="l00666"></a>00666 <span class="preprocessor">#endif</span>
<a name="l00667"></a>00667 <span class="preprocessor"></span><span class="preprocessor">#ifdef ALLEGROGL_HAVE_DYNAMIC_LINK</span>
<a name="l00668"></a>00668 <span class="preprocessor"></span> <span class="keywordflow">if</span> (__agl_handle) {
<a name="l00669"></a>00669 dlclose(__agl_handle);
<a name="l00670"></a>00670 __agl_handle = NULL;
<a name="l00671"></a>00671 }
<a name="l00672"></a>00672 <span class="preprocessor">#endif</span>
<a name="l00673"></a>00673 <span class="preprocessor"></span>}
<a name="l00674"></a>00674
</pre></div></div>
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<li class="navelem"><a class="el" href="glext_8c.html">glext.c</a> </li>
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