collision.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include "irrlichttypes_bloated.h"
#include <vector>
 
class IGameDef;
class Environment;
class ActiveObject;
 
enum CollisionType : u8
{
        COLLISION_NODE,
        COLLISION_OBJECT,
};
 
enum CollisionAxis : s8
{
        COLLISION_AXIS_NONE = -1,
        COLLISION_AXIS_X,
        COLLISION_AXIS_Y,
        COLLISION_AXIS_Z,
};
 
struct CollisionInfo
{
        CollisionInfo() = default;
 
        CollisionType type = COLLISION_NODE;
        CollisionAxis axis = COLLISION_AXIS_NONE;
        v3s16 node_p = v3s16(-32768,-32768,-32768); // COLLISION_NODE
        ActiveObject *object = nullptr; // COLLISION_OBJECT
        v3f new_pos;
        v3f old_speed;
        v3f new_speed;
};
 
struct collisionMoveResult
{
        collisionMoveResult() = default;
 
        bool collides = false;
        bool touching_ground = false;
        bool standing_on_object = false;
        std::vector<CollisionInfo> collisions;
};
 
extern bool g_collision_problems_encountered;
 
collisionMoveResult collisionMoveSimple(Environment *env, IGameDef *gamedef,
                const aabb3f &box_0,
                f32 stepheight, f32 dtime,
                v3f *pos_f, v3f *speed_f,
                v3f accel_f, ActiveObject *self=NULL,
                bool collide_with_objects=true);
 
bool collision_check_intersection(Environment *env, IGameDef *gamedef,
                const aabb3f &box_0, const v3f &pos_f, ActiveObject *self = nullptr,
                bool collide_with_objects = true);
 
// Helper function:
// Checks for collision of a moving aabbox with a static aabbox
// Returns -1 if no collision, 0 if X collision, 1 if Y collision, 2 if Z collision
// dtime receives time until first collision, invalid if -1 is returned
CollisionAxis axisAlignedCollision(
                const aabb3f &staticbox, const aabb3f &movingbox,
                v3f speed, f32 *dtime);
 
// Helper function:
// Checks if moving the movingbox up by the given distance would hit a ceiling.
bool wouldCollideWithCeiling(
                const std::vector<aabb3f> &staticboxes,
                const aabb3f &movingbox,
                f32 y_increase, f32 d);