src/collision.h

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef COLLISION_HEADER
  21 #define COLLISION_HEADER
  22
  23 #include "irrlichttypes_bloated.h"
  24 #include <vector>
  25
  26 class Map;
  27 class IGameDef;
  28
  29 struct collisionMoveResult
  30 {
  31         bool touching_ground;
  32         bool collides;
  33         bool collides_xz;
  34         bool standing_on_unloaded;
  35
  36         collisionMoveResult():
  37                 touching_ground(false),
  38                 collides(false),
  39                 collides_xz(false),
  40                 standing_on_unloaded(false)
  41         {}
  42 };
  43
  44 // Moves using a single iteration; speed should not exceed pos_max_d/dtime
  45 collisionMoveResult collisionMoveSimple(Map *map, IGameDef *gamedef,
  46                 f32 pos_max_d, const aabb3f &box_0,
  47                 f32 stepheight, f32 dtime,
  48                 v3f &pos_f, v3f &speed_f, v3f &accel_f);
  49
  50 #if 0
  51 // This doesn't seem to work and isn't used
  52 // Moves using as many iterations as needed
  53 collisionMoveResult collisionMovePrecise(Map *map, IGameDef *gamedef,
  54                 f32 pos_max_d, const aabb3f &box_0,
  55                 f32 stepheight, f32 dtime,
  56                 v3f &pos_f, v3f &speed_f, v3f &accel_f);
  57 #endif
  58
  59 // Helper function:
  60 // Checks for collision of a moving aabbox with a static aabbox
  61 // Returns -1 if no collision, 0 if X collision, 1 if Y collision, 2 if Z collision
  62 // dtime receives time until first collision, invalid if -1 is returned
  63 int axisAlignedCollision(
  64                 const aabb3f &staticbox, const aabb3f &movingbox,
  65                 const v3f &speed, f32 d, f32 &dtime);
  66
  67 // Helper function:
  68 // Checks if moving the movingbox up by the given distance would hit a ceiling.
  69 bool wouldCollideWithCeiling(
  70                 const std::vector<aabb3f> &staticboxes,
  71                 const aabb3f &movingbox,
  72                 f32 y_increase, f32 d);
  73
  74
  75 enum CollisionType
  76 {
  77         COLLISION_FALL
  78 };
  79
  80 struct CollisionInfo
  81 {
  82         CollisionType t;
  83         f32 speed;
  84 };
  85
  86 #endif
  87