- Removed some old cruft.
- Removed some support for older versions of automake which technically was
correct, but caused the newer automakes to squawk warnings during an
initial sanity check (which isn't done very intelligently.)
NOTE: this fix is technically not correct for older version of automake.
These older version use the variable "INCLUDES" internally and could have
them already set to an important value. That is why we were appending
our values to them. However, newer versions of automake don't set this
value themselves so it is an error to append to a non-existant variable.
We seem to "get away" with overwriting the value on older versions of
automake, but if you have problems, consider upgrading to at least
automake-1.5.
2. I changed Simgear's autogen.sh so it is quieter, and errors out if
autoheader or autoconf fails. It puts all error output in autogen.err, and
deletes it if nothing errored out. The patch is in (sg.autogen.sh.patch.gz)
This patch applies to flightgear, too. If someone doesn't like what I did
here, please speak up! I really believe that this patch will help cause
less confusion among people new to compiling flightgear.
Here are some changes that gave me a significant frame rate increase of about 10 fps with random objects disabled. The interesting thing is that these changes aren't in the main loop but are in tile loader. My guess is that I've reduced the memory footprint just enough to reduce CPU cache misses, though I have no hard evidence of this.
Initially I modified all SGBinObject member functions to pass/return by reference instead of by-value. This gives little or no speed up but allows for some optimizations in fgBinObjLoad(). It is these changes that reduce the number of memory allocations. Needless copying of vectors, and vectors of vectors, can be very memory intensive, especially if they are large.
Anyway I would be interested to see if you get similar results. I would emphasize that the frame rate increase only occurs with random objects disabled. I lose about 10-15 fps on my GF2MX 32MB with random objects, probably a fill-rate limitation or texture memory thing.
not honoured after the first call. This isn't all that efficient, and
the return type probably should change to string eventually, but this
fix avoids changing the headers for now.
result, so after the first call for any node, it simply tests and
returns a pointer. This also fixes the problem of buffer conflicts
with make_string.
Added SGPropertyNode::hasChild(const char * name, int index = 0) to
provide a syntactically-cleaner way to test for the existence of a
child node, i.e.
for (int i = 0; i < 9; i++) {
if (node->hasChild("foo", i))
foo[i] = node->getChild("foo", i)->getDoubleValue();
}
While investigating, I found that SGPropertyNode::getPath returns a
(char *) pointer to the character data of a string on its stack,
i.e. to undefined memory after it returns. I remember someone was
changing strings to char* for efficiency. Perhaps this bug was
introduced then. I'll include a patch for it with my eventual patch
for the above, unless someone beats me to it. I don't think it
affects any existing callers: they all want a string anyway.
Initialise a "possibly uninitialised" variable (which was already
functionally correct).
[Note from DPM: this patch will be blown away if we ever update to a
newer version of Expat.]
Remove a hack that originally worked around a buffer overflow
elsewhere in the file. The buffer overflow was fixed long ago, but
the hack was not removed.
I have modified the SGPropertyNode interface to support node removal
and address the issues you mention yesterday.
I added the SGPropertyNode_ptr class that is a smart pointer that
increment and decrement a counter in SGPropertyNode. The _children
vector is changed to a vector<SGPropertyNode_ptr> in order for the
node to hold a reference to its children. I also added a
_removedChildren vector of the same type. When removeChild is called
with the keep parameter set to true, the reference is removed from
_children and inserted in _removedChildren, and the attribute REMOVED
is set. When getChild is called with create set to true, the _children
vector is searched, then the _removedChildren and then a new node is
created. If a resurrected node is returned, the REMOVED bit is cleared.
The static const int LAST_USED_ATTRIBUTE is also added.
The footprint of this patch is light. SGPropertyNode is one int
longer in size, SGPropertyNode_ptr is one pointer large without
virtual functions. Some functions can be inlined if your current
policy change.
The FlightGear patch is to take account the change in the getChildren
function that now returns a vector<SGPropertyNode_ptr>. If the
removeChild functionnality is to be added in FlightGear, all those
SGPropertyNode * floating around should be changed to
SGPropertyNode_ptr.
