##########################################################################
#
+# Copyright 2011 Jose Fonseca
# Copyright 2008-2010 VMware, Inc.
# All Rights Reserved.
#
class GlxTracer(GlTracer):
+ def is_public_function(self, function):
+ # The symbols visible in libGL.so can vary, so expose them all
+ return True
+
def get_function_address(self, function):
return '__%s' % (function.name,)
def wrap_ret(self, function, instance):
+ GlTracer.wrap_ret(self, function, instance)
+
if function.name in ("glXGetProcAddress", "glXGetProcAddressARB"):
print ' %s = __unwrap_proc_addr(procName, %s);' % (instance, instance)
print
print '#include <stdlib.h>'
print '#include <string.h>'
+ print
+ print '#ifndef _GNU_SOURCE'
+ print '#define _GNU_SOURCE // for dladdr'
+ print '#endif'
print '#include <dlfcn.h>'
print
print '#include "trace_write.hpp"'
print '#include "glproc.hpp"'
print '#include "glsize.hpp"'
print
- print 'extern "C" {'
- print
print 'static __GLXextFuncPtr __unwrap_proc_addr(const GLubyte * procName, __GLXextFuncPtr procPtr);'
print
for f in api.functions:
ptype = function_pointer_type(f)
pvalue = function_pointer_value(f)
- print ' if(!strcmp("%s", (const char *)procName)) {' % f.name
+ print ' if (!strcmp("%s", (const char *)procName)) {' % f.name
print ' %s = (%s)procPtr;' % (pvalue, ptype)
print ' return (__GLXextFuncPtr)&%s;' % (f.name,)
print ' }'
print ' return procPtr;'
print '}'
print
- print '} /* extern "C" */'
+ print r'''
+
+
+/*
+ * Handle to the true libGL.so
+ */
+static void *libgl_handle = NULL;
+
+
+/*
+ * Invoke the true dlopen() function.
+ */
+static void *__dlopen(const char *filename, int flag)
+{
+ typedef void * (*PFNDLOPEN)(const char *, int);
+ static PFNDLOPEN dlopen_ptr = NULL;
+
+ if (!dlopen_ptr) {
+ dlopen_ptr = (PFNDLOPEN)dlsym(RTLD_NEXT, "dlopen");
+ if (!dlopen_ptr) {
+ OS::DebugMessage("error: dlsym(RTLD_NEXT, \"dlopen\") failed\n");
+ return NULL;
+ }
+ }
+
+ return dlopen_ptr(filename, flag);
+}
+
+
+/*
+ * Several applications, such as Quake3, use dlopen("libGL.so.1"), but
+ * LD_PRELOAD does not intercept symbols obtained via dlopen/dlsym, therefore
+ * we need to intercept the dlopen() call here, and redirect to our wrapper
+ * shared object.
+ */
+extern "C" PUBLIC
+void * dlopen(const char *filename, int flag)
+{
+ void *handle;
+
+ handle = __dlopen(filename, flag);
+
+ const char * libgl_filename = getenv("TRACE_LIBGL");
+
+ if (filename && handle && !libgl_filename) {
+ if (0) {
+ OS::DebugMessage("warning: dlopen(\"%s\", 0x%x)\n", filename, flag);
+ }
+
+ // FIXME: handle absolute paths and other versions
+ if (strcmp(filename, "libGL.so") == 0 ||
+ strcmp(filename, "libGL.so.1") == 0) {
+
+ // Use the true libGL.so handle instead of RTLD_NEXT from now on
+ libgl_handle = handle;
+
+ // Get the file path for our shared object, and use it instead
+ static int dummy = 0xdeedbeef;
+ Dl_info info;
+ if (dladdr(&dummy, &info)) {
+ OS::DebugMessage("apitrace: redirecting dlopen(\"%s\", 0x%x)\n", filename, flag);
+ handle = __dlopen(info.dli_fname, flag);
+ } else {
+ OS::DebugMessage("warning: dladdr() failed\n");
+ }
+ }
+ }
+
+ return handle;
+}
+
+
+/*
+ * Lookup a libGL symbol
+ */
+static void * __dlsym(const char *symbol)
+{
+ void *result;
+
+ if (!libgl_handle) {
+ /*
+ * The app doesn't directly link against libGL.so, nor does it directly
+ * dlopen it. So we have to load it ourselves.
+ */
+
+ const char * libgl_filename = getenv("TRACE_LIBGL");
+
+ if (!libgl_filename) {
+ /*
+ * Try to use whatever libGL.so the library is linked against.
+ */
+
+ result = dlsym(RTLD_NEXT, symbol);
+ if (result) {
+ libgl_handle = RTLD_NEXT;
+ return result;
+ }
+
+ libgl_filename = "libGL.so.1";
+ }
+
+ /*
+ * It would have been preferable to use RTLD_LOCAL to ensure that the
+ * application can never access libGL.so symbols directly, but this
+ * won't work, given libGL.so often loads a driver specific SO and
+ * exposes symbols to it.
+ */
+
+ libgl_handle = __dlopen(libgl_filename, RTLD_GLOBAL | RTLD_LAZY);
+ if (!libgl_handle) {
+ OS::DebugMessage("error: couldn't find libGL.so\n");
+ return NULL;
+ }
+ }
+
+ return dlsym(libgl_handle, symbol);
+}
+
+
+'''