-#ifndef DEFAULT_DRIVER_DIR
-/* this is normally defined in Mesa/configs/default with DRI_DRIVER_SEARCH_PATH */
-#define DEFAULT_DRIVER_DIR "/usr/X11R6/lib/modules/dri"
-#endif
-
-static void InfoMessageF(const char *f, ...)
-{
- va_list args;
- const char *env;
-
- if ((env = getenv("LIBGL_DEBUG")) && strstr(env, "verbose")) {
- fprintf(stderr, "libGL: ");
- va_start(args, f);
- vfprintf(stderr, f, args);
- va_end(args);
- }
-}
-
-/**
- * Print error to stderr, unless LIBGL_DEBUG=="quiet".
- */
-static void ErrorMessageF(const char *f, ...)
-{
- va_list args;
- const char *env;
-
- if ((env = getenv("LIBGL_DEBUG")) && !strstr(env, "quiet")) {
- fprintf(stderr, "libGL error: ");
- va_start(args, f);
- vfprintf(stderr, f, args);
- va_end(args);
- }
-}
-
-
-/**
- * Versioned name of the expected \c __driCreateNewScreen function.
- *
- * The version of the last incompatible loader/driver inteface change is
- * appended to the name of the \c __driCreateNewScreen function. This
- * prevents loaders from trying to load drivers that are too old.
- */
-static const char createNewScreenName[] = __DRI_CREATE_NEW_SCREEN_STRING;
-
-
-/**
- * Try to \c dlopen the named driver.
- *
- * This function adds the "_dri.so" suffix to the driver name and searches the
- * directories specified by the \c LIBGL_DRIVERS_PATH environment variable in
- * order to find the driver.
- *
- * \param driverName - a name like "tdfx", "i810", "mga", etc.
- *
- * \returns
- * A handle from \c dlopen, or \c NULL if driver file not found.
- */
-static void *OpenDriver(const char *driverName)
-{
- void *glhandle, *handle;
- const char *libPaths, *p, *next;
- char realDriverName[200];
- int len;
-
- /* Attempt to make sure libGL symbols will be visible to the driver */
- glhandle = dlopen("libGL.so.1", RTLD_NOW | RTLD_GLOBAL);
-
- libPaths = DEFAULT_DRIVER_DIR;
- if (geteuid() == getuid()) {
- /* don't allow setuid apps to use LIBGL_DRIVERS_PATH */
- libPaths = getenv("LIBGL_DRIVERS_PATH");
- if (!libPaths)
- libPaths = getenv("LIBGL_DRIVERS_DIR"); /* deprecated */
- }
-
- handle = NULL;
- for (p = libPaths; *p; p = next) {
- next = strchr(p, ':');
- if (next == NULL) {
- len = strlen(p);
- next = p + len;
- } else {
- len = next - p;
- next++;
- }
-
-#ifdef GLX_USE_TLS
- snprintf(realDriverName, sizeof realDriverName,
- "%.*s/tls/%s_dri.so", len, p, driverName);
- InfoMessageF("OpenDriver: trying %s\n", realDriverName);
- handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
-#endif
-
- if ( handle == NULL ) {
- snprintf(realDriverName, sizeof realDriverName,
- "%.*s/%s_dri.so", len, p, driverName);
- InfoMessageF("OpenDriver: trying %s\n", realDriverName);
- handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL);
- }
-
- if ( handle != NULL )
- break;
- else
- ErrorMessageF("dlopen %s failed (%s)\n", realDriverName, dlerror());
- }
-
- if (!handle)
- ErrorMessageF("unable to load driver: %s_dri.so\n", driverName);
-
- if (glhandle)
- dlclose(glhandle);
-
- return handle;
-}
-