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# glext.c

Go to the documentation of this file.

    00001 /* This code is (C) AllegroGL contributors, and double licensed under
    00002  * the GPL and zlib licenses. See gpl.txt or zlib.txt for details.
    00003  */
    00008 #include "alleggl.h"
    00009 #include "allglint.h"
    00010 #include <string.h>
    00011 #ifdef ALLEGRO_MACOSX
    00012 #include <OpenGL/glu.h>
    00013 #else
    00014 #include <GL/glu.h>
    00015 #endif
    00016
    00017 #include <allegro/internal/aintern.h>
    00018
    00019
    00020 /* GL extension Structure. Holds the extension pointers for a single context */
    00021 #define AGL_API(type, name, args) AGL_##name##_t name;
    00022 typedef struct AGL_EXT {
    00023 #   include "allegrogl/GLext/gl_ext_api.h"
    00024 #ifdef ALLEGRO_WINDOWS
    00025 #   include "allegrogl/GLext/wgl_ext_api.h"
    00026 #elif defined ALLEGRO_UNIX
    00027 #   include "allegrogl/GLext/glx_ext_api.h"
    00028 #endif
    00029 } AGL_EXT;
    00030 #undef AGL_API
    00031
    00032 #define PREFIX_I                "agl-ext INFO: "
    00033 #define PREFIX_W                "agl-ext WARNING: "
    00034 #define PREFIX_E                "agl-ext ERROR: "
    00035
    00036
    00037 /* Current driver info */
    00038 struct allegro_gl_info allegro_gl_info;
    00039
    00040
    00041
    00055 struct AGL_EXTENSION_LIST_GL allegro_gl_extensions_GL;
    00056
    00057
    00058
    00064 #ifdef ALLEGRO_UNIX
    00065 struct AGL_EXTENSION_LIST_GLX allegro_gl_extensions_GLX;
    00066 #endif
    00067
    00068
    00069
    00075 #ifdef ALLEGRO_WINDOWS
    00076 struct AGL_EXTENSION_LIST_WGL allegro_gl_extensions_WGL;
    00077 #endif
    00078
    00079
    00080
    00081 /* Current context */
    00082 AGL_EXT *agl_extension_table = NULL;
    00083
    00084
    00085 #ifdef ALLEGROGL_GENERIC_DRIVER
    00086 #include "GL/amesa.h"
    00087 #endif
    00088
    00089
    00090 #ifdef ALLEGROGL_HAVE_DYNAMIC_LINK
    00091 #include <dlfcn.h>
    00092
    00093 /* Handle for dynamic library libGL.so */
    00094 static void* __agl_handle = NULL;
    00095 /* Pointer to glXGetProcAddressARB */
    00096 typedef void* (*GLXGETPROCADDRESSARBPROC) (const GLubyte*);
    00097 static GLXGETPROCADDRESSARBPROC aglXGetProcAddress;
    00098 #else
    00099 /* Tries static linking */
    00100 #ifdef ALLEGROGL_GLXGETPROCADDRESSARB
    00101 #define aglXGetProcAddress glXGetProcAddressARB
    00102 #else
    00103 #define aglXGetProcAddress glXGetProcAddress
    00104 #endif
    00105 #endif
    00106
    00107
    00108 #ifdef ALLEGRO_MACOSX
    00109 #undef TRUE
    00110 #undef FALSE
    00111 #include <Carbon/Carbon.h>
    00112 #undef TRUE
    00113 #undef FALSE
    00114 #define TRUE  -1
    00115 #define FALSE 0
    00116
    00117 static CFBundleRef opengl_bundle_ref;
    00118 #endif
    00119
    00120
    00121
    00122 /* Define the GL API pointers */
    00123 #define AGL_API(type, name, args) AGL_##name##_t __agl##name = NULL;
    00124 #   include "allegrogl/GLext/gl_ext_api.h"
    00125 #undef AGL_API
    00126 #ifdef ALLEGRO_WINDOWS
    00127 #define AGL_API(type, name, args) AGL_##name##_t __awgl##name = NULL;
    00128 #   include "allegrogl/GLext/wgl_ext_api.h"
    00129 #undef AGL_API
    00130 #elif defined ALLEGRO_UNIX
    00131 #define AGL_API(type, name, args) AGL_##name##_t __aglX##name = NULL;
    00132 #   include "allegrogl/GLext/glx_ext_api.h"
    00133 #undef AGL_API
    00134 #endif
    00135
    00136
    00137
    00138 /* Create the extension table */
    00139 AGL_EXT* __allegro_gl_create_extensions() {
    00140
    00141     AGL_EXT *ret = malloc(sizeof(AGL_EXT));
    00142
    00143     if (!ret) {
    00144         return NULL;
    00145     }
    00146
    00147     memset(ret, 0, sizeof(AGL_EXT));
    00148
    00149     return ret;
    00150 }
    00151
    00152
    00153
    00154 /* Load the extension addresses into the table.
    00155  * Should only be done on context creation.
    00156  */
    00157 void __allegro_gl_load_extensions(AGL_EXT *ext) {
    00158
    00159 #ifdef ALLEGRO_MACOSX
    00160     CFStringRef function;
    00161 #endif
    00162
    00163     if (!ext) {
    00164         return;
    00165     }
    00166 #ifdef ALLEGRO_UNIX
    00167     if (!aglXGetProcAddress) {
    00168         return;
    00169     }
    00170 #endif
    00171
    00172 #   ifdef ALLEGRO_WINDOWS
    00173 #   define AGL_API(type, name, args) \
    00174         ext->name = (AGL_##name##_t)wglGetProcAddress("gl" #name); \
    00175         if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }
    00176 #   include "allegrogl/GLext/gl_ext_api.h"
    00177 #   undef AGL_API
    00178 #   define AGL_API(type, name, args) \
    00179         ext->name = (AGL_##name##_t)wglGetProcAddress("wgl" #name); \
    00180         if (ext->name) { AGL_LOG(2,"wgl" #name " successfully loaded\n"); }
    00181 #   include "allegrogl/GLext/wgl_ext_api.h"
    00182 #   undef AGL_API
    00183 #   elif defined ALLEGRO_UNIX
    00184 #   define AGL_API(type, name, args) \
    00185         ext->name = (AGL_##name##_t)aglXGetProcAddress((const GLubyte*)"gl" #name); \
    00186         if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }
    00187 #   include "allegrogl/GLext/gl_ext_api.h"
    00188 #   undef AGL_API
    00189 #   define AGL_API(type, name, args) \
    00190         ext->name = (AGL_##name##_t)aglXGetProcAddress((const GLubyte*)"glX" #name); \
    00191         if (ext->name) { AGL_LOG(2,"glX" #name " successfully loaded\n"); }
    00192 #   include "allegrogl/GLext/glx_ext_api.h"
    00193 #   undef AGL_API
    00194 #   elif defined ALLEGRO_MACOSX
    00195 #   define AGL_API(type, name, args)                                          \
    00196         function = CFStringCreateWithCString(kCFAllocatorDefault, "gl" #name, \
    00197                                                      kCFStringEncodingASCII); \
    00198         if (function) {                                                       \
    00199             ext->name = (AGL_##name##_t)CFBundleGetFunctionPointerForName(    \
    00200                                              opengl_bundle_ref, function);    \
    00201             CFRelease(function);                                              \
    00202         }                                                                     \
    00203         if (ext->name) { AGL_LOG(2,"gl" #name " successfully loaded\n"); }
    00204 #   include "allegrogl/GLext/gl_ext_api.h"
    00205 #   undef AGL_API
    00206 #   endif
    00207 }
    00208
    00209
    00210
    00211 /* Set the GL API pointers to the current table
    00212  * Should only be called on context switches.
    00213  */
    00214 void __allegro_gl_set_extensions(AGL_EXT *ext) {
    00215
    00216     if (!ext) {
    00217         return;
    00218     }
    00219
    00220 #define AGL_API(type, name, args) __agl##name = ext->name;
    00221 #   include "allegrogl/GLext/gl_ext_api.h"
    00222 #undef AGL_API
    00223 #ifdef ALLEGRO_WINDOWS
    00224 #define AGL_API(type, name, args) __awgl##name = ext->name;
    00225 #   include "allegrogl/GLext/wgl_ext_api.h"
    00226 #undef AGL_API
    00227 #elif defined ALLEGRO_UNIX
    00228 #define AGL_API(type, name, args) __aglX##name = ext->name;
    00229 #   include "allegrogl/GLext/glx_ext_api.h"
    00230 #undef AGL_API
    00231 #endif
    00232 }
    00233
    00234
    00235
    00236 /* Destroys the extension table */
    00237 void __allegro_gl_destroy_extensions(AGL_EXT *ext) {
    00238
    00239     if (ext) {
    00240         if (ext == agl_extension_table) {
    00241             agl_extension_table = NULL;
    00242         }
    00243         free(ext);
    00244     }
    00245 }
    00246
    00247
    00248
    00249 /* __allegro_gl_look_for_an_extension:
    00250  * This function has been written by Mark J. Kilgard in one of his
    00251  * tutorials about OpenGL extensions
    00252  */
    00253 int __allegro_gl_look_for_an_extension(AL_CONST char *name,
    00254                                                   AL_CONST GLubyte * extensions)
    00255 {
    00256     AL_CONST GLubyte *start;
    00257     GLubyte *where, *terminator;
    00258
    00259     /* Extension names should not have spaces. */
    00260     where = (GLubyte *) strchr(name, ' ');
    00261     if (where || *name == '\0')
    00262         return FALSE;
    00263     /* It takes a bit of care to be fool-proof about parsing the
    00264      * OpenGL extensions string. Don't be fooled by sub-strings, etc.
    00265      */
    00266     start = extensions;
    00267     for (;;) {
    00268         where = (GLubyte *) strstr((AL_CONST char *) start, name);
    00269         if (!where)
    00270         break;
    00271         terminator = where + strlen(name);
    00272         if (where == start || *(where - 1) == ' ')
    00273             if (*terminator == ' ' || *terminator == '\0')
    00274                 return TRUE;
    00275         start = terminator;
    00276     }
    00277     return FALSE;
    00278 }
    00279
    00280
    00281
    00282 #ifdef ALLEGRO_WINDOWS
    00283 static AGL_GetExtensionsStringARB_t __wglGetExtensionsStringARB = NULL;
    00284 static HDC __hdc = NULL;
    00285 #elif defined ALLEGRO_UNIX
    00286 #include <xalleg.h>
    00287 #endif
    00288
    00289
    00290 /* int allegro_gl_is_extension_supported(AL_CONST char *extension) */
    00306 int allegro_gl_is_extension_supported(AL_CONST char *extension)
    00307 {
    00308     int ret;
    00309
    00310     if (!__allegro_gl_valid_context)
    00311         return FALSE;
    00312
    00313     if (!glGetString(GL_EXTENSIONS))
    00314         return FALSE;
    00315
    00316     ret = __allegro_gl_look_for_an_extension(extension,
    00317                                                   glGetString(GL_EXTENSIONS));
    00318
    00319 #ifdef ALLEGRO_WINDOWS
    00320     if (!ret && strncmp(extension, "WGL", 3) == 0) {
    00321         if (!__wglGetExtensionsStringARB || __hdc != __allegro_gl_hdc) {
    00322             __wglGetExtensionsStringARB = (AGL_GetExtensionsStringARB_t)
    00323                                wglGetProcAddress("wglGetExtensionsStringARB");
    00324             __hdc = __allegro_gl_hdc;
    00325         }
    00326         if (__wglGetExtensionsStringARB) {
    00327             ret = __allegro_gl_look_for_an_extension(extension,
    00328                        (AL_CONST GLubyte*)__wglGetExtensionsStringARB(__allegro_gl_hdc));
    00329         }
    00330     }
    00331 #elif defined ALLEGRO_UNIX
    00332     if (!ret && strncmp(extension, "GLX", 3) == 0) {
    00333         XLOCK();
    00334         ret = __allegro_gl_look_for_an_extension(extension,
    00335                 (const GLubyte*)glXQueryExtensionsString(_xwin.display,
    00336                                                          _xwin.screen));
    00337         XUNLOCK();
    00338     }
    00339 #endif
    00340
    00341     return ret;
    00342 }
    00343
    00344
    00345
    00346 /* void * allegro_gl_get_proc_address(AL_CONST char *name) */
    00372 void *allegro_gl_get_proc_address(AL_CONST char *name)
    00373 {
    00374     void *symbol = NULL;
    00375 #ifdef ALLEGRO_MACOSX
    00376     CFStringRef function;
    00377 #endif
    00378
    00379     if (!__allegro_gl_valid_context)
    00380         return NULL;
    00381
    00382 #ifdef ALLEGROGL_GENERIC_DRIVER
    00383     /* AMesa provides a function to get a proc address. It does
    00384      * not emulate dynamic linking of course...
    00385      */
    00386     symbol = AMesaGetProcAddress(name);
    00387
    00388 #elif defined ALLEGRO_WINDOWS
    00389     /* For once Windows is the easiest platform to use :)
    00390      * It provides a standardized way to get a function address
    00391      * But of course there is a drawback : the symbol is only valid
    00392      * under the current context :P
    00393      */
    00394     symbol = wglGetProcAddress(name);
    00395 #elif defined ALLEGRO_UNIX
    00396     if (aglXGetProcAddress) {
    00397         /* This is definitely the *good* way on Unix to get a GL proc
    00398          * address. Unfortunately glXGetProcAddress is an extension
    00399          * and may not be available on all platforms
    00400          */
    00401         symbol = aglXGetProcAddress((const GLubyte*)name);
    00402     }
    00403 #elif defined ALLEGROGL_HAVE_DYNAMIC_LINK
    00404     else {
    00405         /* Hack if glXGetProcAddress is not available :
    00406          * we try to find the symbol into libGL.so
    00407          */
    00408         if (__agl_handle) {
    00409             symbol = dlsym(__agl_handle, name);
    00410         }
    00411     }
    00412 #elif defined ALLEGRO_MACOSX
    00413     function = CFStringCreateWithCString(kCFAllocatorDefault, name,
    00414                                          kCFStringEncodingASCII);
    00415     if (function) {
    00416         symbol = CFBundleGetFunctionPointerForName(opengl_bundle_ref, function);
    00417         CFRelease(function);
    00418     }
    00419 #else
    00420     /* DOS does not support dynamic linking. If the function is not
    00421      * available at build-time then it will not be available at run-time
    00422      * Therefore we do not need to look for it...
    00423      */
    00424 #endif
    00425
    00426     if (!symbol) {
    00427
    00428 #if defined ALLEGROGL_HAVE_DYNAMIC_LINK
    00429         if (!aglXGetProcAddress) {
    00430             TRACE(PREFIX_W "get_proc_address: libdl::dlsym: %s\n",
    00431                   dlerror());
    00432         }
    00433 #endif
    00434
    00435         TRACE(PREFIX_W "get_proc_address : Unable to load symbol %s\n",
    00436               name);
    00437     }
    00438     else {
    00439         TRACE(PREFIX_I "get_proc_address : Symbol %s successfully loaded\n",
    00440               name);
    00441     }
    00442     return symbol;
    00443 }
    00444
    00445
    00446
    00447 /* Fills in the AllegroGL info struct for blacklisting video cards.
    00448  */
    00449 static void __fill_in_info_struct(const GLubyte *rendereru,
    00450                                   struct allegro_gl_info *info) {
    00451     const char *renderer = (const char*)rendereru;
    00452
    00453     /* Some cards are "special"... */
    00454     if (strstr(renderer, "3Dfx/Voodoo")) {
    00455         info->is_voodoo = 1;
    00456     }
    00457     else if (strstr(renderer, "Matrox G200")) {
    00458         info->is_matrox_g200 = 1;
    00459     }
    00460     else if (strstr(renderer, "RagePRO")) {
    00461         info->is_ati_rage_pro = 1;
    00462     }
    00463     else if (strstr(renderer, "RADEON 7000")) {
    00464         info->is_ati_radeon_7000 = 1;
    00465     }
    00466     else if (strstr(renderer, "Mesa DRI R200")) {
    00467         info->is_ati_r200_chip = 1;
    00468     }
    00469
    00470     if ((strncmp(renderer, "3Dfx/Voodoo3 ", 13) == 0)
    00471      || (strncmp(renderer, "3Dfx/Voodoo2 ", 13) == 0)
    00472      || (strncmp(renderer, "3Dfx/Voodoo ", 12) == 0)) {
    00473         info->is_voodoo3_and_under = 1;
    00474     }
    00475
    00476     /* Read OpenGL properties */
    00477     info->version = allegro_gl_opengl_version();
    00478
    00479     return;
    00480 }
    00481
    00482
    00483
    00484 /* __allegro_gl_manage_extensions:
    00485  * This functions fills the __allegro_gl_extensions structure and displays
    00486  * on the log file which extensions are available
    00487  */
    00488 void __allegro_gl_manage_extensions(void)
    00489 {
    00490     AL_CONST GLubyte *buf;
    00491     int i;
    00492
    00493 #ifdef ALLEGRO_MACOSX
    00494     CFURLRef bundle_url;
    00495 #endif
    00496
    00497     /* Print out OpenGL extensions */
    00498 #if LOGLEVEL >= 1
    00499     AGL_LOG(1, "OpenGL Extensions:\n");
    00500              __allegro_gl_print_extensions((AL_CONST char*)
    00501             glGetString(GL_EXTENSIONS));
    00502 #endif
    00503
    00504     /* Print out GLU version */
    00505     buf = gluGetString(GLU_VERSION);
    00506     TRACE(PREFIX_I "GLU Version : %s\n", buf);
    00507
    00508 #ifdef ALLEGROGL_HAVE_DYNAMIC_LINK
    00509     /* Get glXGetProcAddress entry */
    00510     __agl_handle = dlopen("libGL.so", RTLD_LAZY);
    00511     if (__agl_handle) {
    00512         aglXGetProcAddress = (GLXGETPROCADDRESSARBPROC) dlsym(__agl_handle,
    00513                                                         "glXGetProcAddressARB");
    00514         if (!aglXGetProcAddress) {
    00515             aglXGetProcAddress = (GLXGETPROCADDRESSARBPROC) dlsym(__agl_handle,
    00516                                                            "glXGetProcAddress");
    00517         }
    00518     }
    00519     else {
    00520         TRACE(PREFIX_W "Failed to dlopen libGL.so : %s\n", dlerror());
    00521     }
    00522     TRACE(PREFIX_I "glXGetProcAddress Extension: %s\n",
    00523                            aglXGetProcAddress ? "Supported" : "Unsupported");
    00524 #elif defined ALLEGRO_UNIX
    00525 #ifdef ALLEGROGL_GLXGETPROCADDRESSARB
    00526     TRACE(PREFIX_I "glXGetProcAddressARB Extension: supported\n");
    00527 #else
    00528     TRACE(PREFIX_I "glXGetProcAddress Extension: supported\n");
    00529 #endif
    00530 #endif
    00531
    00532 #ifdef ALLEGRO_MACOSX
    00533     bundle_url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
    00534                          CFSTR("/System/Library/Frameworks/OpenGL.framework"),
    00535                          kCFURLPOSIXPathStyle, true);
    00536     opengl_bundle_ref = CFBundleCreate(kCFAllocatorDefault, bundle_url);
    00537     CFRelease(bundle_url);
    00538 #endif
    00539
    00540     __fill_in_info_struct(glGetString(GL_RENDERER), &allegro_gl_info);
    00541
    00542     /* Load extensions */
    00543     agl_extension_table = __allegro_gl_create_extensions();
    00544     __allegro_gl_load_extensions(agl_extension_table);
    00545     __allegro_gl_set_extensions(agl_extension_table);
    00546
    00547     for (i = 0; i < 5; i++) {
    00548         __allegro_gl_texture_read_format[i] = -1;
    00549         __allegro_gl_texture_components[i] = GL_RGB;
    00550     }
    00551     __allegro_gl_texture_read_format[3] = GL_UNSIGNED_BYTE;
    00552     __allegro_gl_texture_read_format[4] = GL_UNSIGNED_BYTE;
    00553     __allegro_gl_texture_components[4] = GL_RGBA;
    00554
    00555
    00556     /* Get extension info for the rest of the lib */
    00557 #    define AGL_EXT(name, ver) {                               \
    00558         allegro_gl_extensions_GL.name =                        \
    00559               allegro_gl_is_extension_supported("GL_" #name)   \
    00560           || (allegro_gl_info.version >= ver && ver > 0);      \
    00561     }
    00562 #   include "allegrogl/GLext/gl_ext_list.h"
    00563 #   undef AGL_EXT
    00564
    00565 #ifdef ALLEGRO_UNIX
    00566 #    define AGL_EXT(name, ver) {                               \
    00567         allegro_gl_extensions_GLX.name =                       \
    00568               allegro_gl_is_extension_supported("GLX_" #name)  \
    00569           || (allegro_gl_info.version >= ver && ver > 0);      \
    00570     }
    00571 #   include "allegrogl/GLext/glx_ext_list.h"
    00572 #   undef AGL_EXT
    00573 #elif defined ALLEGRO_WINDOWS
    00574 #    define AGL_EXT(name, ver) {                               \
    00575         allegro_gl_extensions_WGL.name =                       \
    00576               allegro_gl_is_extension_supported("WGL_" #name)  \
    00577           || (allegro_gl_info.version >= ver && ver > 0);      \
    00578     }
    00579 #   include "allegrogl/GLext/wgl_ext_list.h"
    00580 #   undef AGL_EXT
    00581 #endif
    00582
    00583     /* Get number of texture units */
    00584     if (allegro_gl_extensions_GL.ARB_multitexture) {
    00585         glGetIntegerv(GL_MAX_TEXTURE_UNITS,
    00586                       (GLint*)&allegro_gl_info.num_texture_units);
    00587     }
    00588     else {
    00589         allegro_gl_info.num_texture_units = 1;
    00590     }
    00591
    00592     /* Get max texture size */
    00593     glGetIntegerv(GL_MAX_TEXTURE_SIZE,
    00594                   (GLint*)&allegro_gl_info.max_texture_size);
    00595
    00596     /* Note: Voodoo (even V5) don't seem to correctly support
    00597      * packed pixel formats. Disabling them for those cards.
    00598      */
    00599     allegro_gl_extensions_GL.EXT_packed_pixels &= !allegro_gl_info.is_voodoo;
    00600
    00601
    00602     if (allegro_gl_extensions_GL.EXT_packed_pixels) {
    00603
    00604         AGL_LOG(1, "Packed Pixels formats available\n");
    00605
    00606         /* XXX On NV cards, we want to use BGRA instead of RGBA for speed */
    00607         /* Fills the __allegro_gl_texture_format array */
    00608         __allegro_gl_texture_read_format[0] = GL_UNSIGNED_BYTE_3_3_2;
    00609         __allegro_gl_texture_read_format[1] = GL_UNSIGNED_SHORT_5_5_5_1;
    00610         __allegro_gl_texture_read_format[2] = GL_UNSIGNED_SHORT_5_6_5;
    00611     }
    00612
    00613     /* NVidia and ATI cards expose OpenGL 2.0 but often don't accelerate
    00614      * non-power-of-2 textures. This check is how you verify that NP2
    00615      * textures are hardware accelerated or not.
    00616      * We should clobber the NPOT support if it's not accelerated.
    00617      */
    00618     {   const char *vendor = (const char*)glGetString(GL_VENDOR);
    00619         if (strstr(vendor, "NVIDIA Corporation")) {
    00620             if (!allegro_gl_extensions_GL.NV_fragment_program2
    00621              || !allegro_gl_extensions_GL.NV_vertex_program3) {
    00622                 allegro_gl_extensions_GL.ARB_texture_non_power_of_two = 0;
    00623             }
    00624         }
    00625         else if (strstr(vendor, "ATI Technologies")) {
    00626             if (!strstr((const char*)glGetString(GL_EXTENSIONS),
    00627                         "GL_ARB_texture_non_power_of_two")
    00628              && allegro_gl_info.version >= 2.0f) {
    00629                 allegro_gl_extensions_GL.ARB_texture_non_power_of_two = 0;
    00630             }
    00631         }
    00632     }
    00633 }
    00634
    00635
    00636
    00637 /* __allegro_gl_print_extensions:
    00638  * Given a string containing extensions (i.e. a NULL terminated string where
    00639  * each extension are separated by a space and which names do not contain any
    00640  * space)
    00641  */
    00642 void __allegro_gl_print_extensions(AL_CONST char * extension)
    00643 {
    00644         char buf[80];
    00645         char* start;
    00646
    00647         while (*extension != '\0') {
    00648                 start = buf;
    00649                 strncpy(buf, extension, 80);
    00650                 while ((*start != ' ') && (*start != '\0')) {
    00651                         extension++;
    00652                         start++;
    00653                 }
    00654                 *start = '\0';
    00655                 extension ++;
    00656                 TRACE(PREFIX_I "%s\n", buf);
    00657         }
    00658 }
    00659
    00660
    00661
    00662 void __allegro_gl_unmanage_extensions() {
    00663     __allegro_gl_destroy_extensions(agl_extension_table);
    00664 #ifdef ALLEGRO_MACOSX
    00665     CFRelease(opengl_bundle_ref);
    00666 #endif
    00667 #ifdef ALLEGROGL_HAVE_DYNAMIC_LINK
    00668     if (__agl_handle) {
    00669         dlclose(__agl_handle);
    00670         __agl_handle = NULL;
    00671     }
    00672 #endif
    00673 }
    00674