#include <string.h>
-#ifndef WIN32
-#include <dlfcn.h>
-#else
-#include <windows.h>
-#endif
-
#include "extensions.hxx"
+#include <simgear/debug/logstream.hxx>
+#if !defined(WIN32)
+# include <dlfcn.h>
+#endif
-bool SGSearchExtensionsString(char *extString, char *extName) {
+bool SGSearchExtensionsString(const char *extString, const char *extName) {
// Returns GL_TRUE if the *extName string appears in the *extString string,
// surrounded by white spaces, or GL_FALSE otherwise.
- char *p, *end;
+ const char *p, *end;
int n, extNameLen;
+ if ((extString == NULL) || (extName == NULL))
+ return false;
+
extNameLen = strlen(extName);
p=extString;
// The *extName string must follow the OpenGL extensions naming scheme
// (ie: "GL_type_extension", like GL_EXT_convolution)
- return SGSearchExtensionsString((char *)glGetString(GL_EXTENSIONS),
-extName);
+ return SGSearchExtensionsString((const char *)glGetString(GL_EXTENSIONS),extName);
}
#ifdef __APPLE__
return function;
}
+#elif !defined( WIN32 )
+
+void *SGGetGLProcAddress(const char *func) {
+ static void *libHandle = NULL;
+ static void *(*glXGetProcAddressPtr)(const GLubyte*) = 0;
+ void *fptr = NULL;
+
+ /*
+ * Clear the error buffer
+ */
+ dlerror();
+
+ /*
+ * Since libGL must be linked to the binary we run on, this is the
+ * right handle. That 'current binary' handle also avoids conflicts which
+ * arise from linking with a different libGL at link time an than later
+ * use the standard libGL at runtime ...
+ */
+ if (libHandle == NULL) {
+ libHandle = dlopen(NULL, RTLD_LAZY);
+
+ if (!libHandle) {
+#if defined (__FreeBSD__)
+ const char *error = dlerror();
+#else
+ char *error = dlerror();
+#endif
+ if (error) {
+ SG_LOG(SG_GENERAL, SG_INFO, error);
+ return 0;
+ }
+ }
+
+ void* symbol = dlsym(libHandle, "glXGetProcAddress");
+ if (!symbol)
+ symbol = dlsym(libHandle, "glXGetProcAddressARB");
+ glXGetProcAddressPtr = (void *(*)(const GLubyte*)) symbol;
+ }
+
+ // First try the glx api function for that
+ if (glXGetProcAddressPtr) {
+ fptr = glXGetProcAddressPtr((const GLubyte*)func);
+
+ } else if (libHandle != NULL) {
+ fptr = dlsym(libHandle, func);
+
+#if defined (__FreeBSD__)
+ const char *error = dlerror();
+#else
+ char *error = dlerror();
+#endif
+ if (error)
+ SG_LOG(SG_GENERAL, SG_INFO, error);
+ }
+
+ return fptr;
+}
+
#endif
+