minetest/src/treegen.h
Craig Robbins f33d31693e Fix seg fault if popping from empty stack (L-system trees)
See: https://github.com/minetest/minetest/issues/1525

Background
Wuzzy2: If you attempt to spawn a L-system tree with minetest.spawn_tree, you can make Minetest crash if it is attempted to pop an empty stack.

ShadowNinja: This shouldn't cause a segmentation fault, but it should throw a Lua error

Commit Description
This commit throws a Lua error instead of causing a segmentation fault. The server will still "crash" but will include a Lua backtrace.

L-Systems fix randomness
Unless a random seed is provided (via Lua treedef) seed the PRNG with a different seed for each tree
Resolves: https://github.com/minetest/minetest/issues/1469

Fix l-system crash when treedef random_level not set by Lua
2014-08-23 06:40:27 +02:00

92 lines
2.8 KiB
C++

/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>,
2012-2013 RealBadAngel, Maciej Kasatkin <mk@realbadangel.pl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef TREEGEN_HEADER
#define TREEGEN_HEADER
#include <matrix4.h>
#include "noise.h"
class ManualMapVoxelManipulator;
class INodeDefManager;
class ServerEnvironment;
namespace treegen {
enum error {
SUCCESS,
UNBALANCED_BRACKETS
};
struct TreeDef {
std::string initial_axiom;
std::string rules_a;
std::string rules_b;
std::string rules_c;
std::string rules_d;
MapNode trunknode;
MapNode leavesnode;
MapNode leaves2node;
int leaves2_chance;
int angle;
int iterations;
int iterations_random_level;
std::string trunk_type;
bool thin_branches;
MapNode fruitnode;
int fruit_chance;
int seed;
bool explicit_seed;
};
// Add default tree
void make_tree(ManualMapVoxelManipulator &vmanip, v3s16 p0,
bool is_apple_tree, INodeDefManager *ndef, int seed);
// Add jungle tree
void make_jungletree(VoxelManipulator &vmanip, v3s16 p0,
INodeDefManager *ndef, int seed);
// Add L-Systems tree (used by engine)
treegen::error make_ltree(ManualMapVoxelManipulator &vmanip, v3s16 p0, INodeDefManager *ndef,
TreeDef tree_definition);
// Spawn L-systems tree from LUA
treegen::error spawn_ltree (ServerEnvironment *env, v3s16 p0, INodeDefManager *ndef,
TreeDef tree_definition);
// L-System tree gen helper functions
void tree_node_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
MapNode node);
void tree_trunk_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
TreeDef &tree_definition);
void tree_leaves_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
PseudoRandom ps, TreeDef &tree_definition);
void tree_single_leaves_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
PseudoRandom ps, TreeDef &tree_definition);
void tree_fruit_placement(ManualMapVoxelManipulator &vmanip, v3f p0,
TreeDef &tree_definition);
irr::core::matrix4 setRotationAxisRadians(irr::core::matrix4 M, double angle, v3f axis);
v3f transposeMatrix(irr::core::matrix4 M ,v3f v);
}; // namespace treegen
#endif