raycast.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2016 juhdanad, Daniel Juhasz <juhdanad@gmail.com>
 
#pragma once
 
#include <queue>
#include <quaternion.h>
#include "voxelalgorithms.h"
#include "util/pointedthing.h"

struct RaycastSort
{
        bool operator() (const PointedThing &pt1, const PointedThing &pt2) const;
};

class RaycastState
{
public:
        RaycastState(const core::line3d<f32> &shootline, bool objects_pointable,
                bool liquids_pointable, const std::optional<Pointabilities> &pointabilities);

        core::line3d<f32> m_shootline;
        voxalgo::VoxelLineIterator m_iterator;
        v3s16 m_previous_node;

        std::priority_queue<PointedThing, std::vector<PointedThing>, RaycastSort> m_found;
 
        bool m_objects_pointable;
        bool m_liquids_pointable;
        const std::optional<Pointabilities> m_pointabilities;

        core::aabbox3d<s16> m_search_range { 0, 0, 0, 0, 0, 0 };

        bool m_initialization_needed = true;
};

bool boxLineCollision(const aabb3f &box, v3f start, v3f dir,
        v3f *collision_point, v3f *collision_normal);
 
bool boxLineCollision(const aabb3f &box, core::quaternion box_rotation,
        v3f start, v3f dir,
        v3f *collision_point, v3f *collision_normal, v3f *raw_collision_normal);