src/collision.h

   1 /*
   2 Minetest
   3 Copyright (C) 2013 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 #pragma once
  21
  22 #include "irrlichttypes_bloated.h"
  23 #include <vector>
  24
  25 class Map;
  26 class IGameDef;
  27 class Environment;
  28 class ActiveObject;
  29
  30 enum CollisionType
  31 {
  32         COLLISION_NODE,
  33         COLLISION_OBJECT,
  34 };
  35
  36 enum CollisionAxis
  37 {
  38         COLLISION_AXIS_NONE = -1,
  39         COLLISION_AXIS_X,
  40         COLLISION_AXIS_Y,
  41         COLLISION_AXIS_Z,
  42 };
  43
  44 struct CollisionInfo
  45 {
  46         CollisionInfo() = default;
  47
  48         CollisionType type = COLLISION_NODE;
  49         CollisionAxis axis = COLLISION_AXIS_NONE;
  50         v3s16 node_p = v3s16(-32768,-32768,-32768); // COLLISION_NODE
  51         ActiveObject *object = nullptr; // COLLISION_OBJECT
  52         v3f old_speed;
  53         v3f new_speed;
  54         int plane = -1;
  55 };
  56
  57 struct collisionMoveResult
  58 {
  59         collisionMoveResult() = default;
  60
  61         bool touching_ground = false;
  62         bool collides = false;
  63         bool standing_on_object = false;
  64         std::vector<CollisionInfo> collisions;
  65 };
  66
  67 // Moves using a single iteration; speed should not exceed pos_max_d/dtime
  68 collisionMoveResult collisionMoveSimple(Environment *env,IGameDef *gamedef,
  69                 f32 pos_max_d, const aabb3f &box_0,
  70                 f32 stepheight, f32 dtime,
  71                 v3f *pos_f, v3f *speed_f,
  72                 v3f accel_f, ActiveObject *self=NULL,
  73                 bool collideWithObjects=true, bool jesus=false);
  74
  75 // Helper function:
  76 // Checks for collision of a moving aabbox with a static aabbox
  77 // Returns -1 if no collision, 0 if X collision, 1 if Y collision, 2 if Z collision
  78 // dtime receives time until first collision, invalid if -1 is returned
  79 CollisionAxis axisAlignedCollision(
  80                 const aabb3f &staticbox, const aabb3f &movingbox,
  81                 const v3f &speed, f32 *dtime);
  82
  83 // Helper function:
  84 // Checks if moving the movingbox up by the given distance would hit a ceiling.
  85 bool wouldCollideWithCeiling(
  86                 const std::vector<aabb3f> &staticboxes,
  87                 const aabb3f &movingbox,
  88                 f32 y_increase, f32 d);