space_partition.h

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/*                 S P A C E _ P A R T I T I O N . H
 * BRL-CAD
 *
 * Copyright (c) 1993-2025 United States Government as represented by
 * the U.S. Army Research Laboratory.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * version 2.1 as published by the Free Software Foundation.
 *
 * This library 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 file; see the file named COPYING for more
 * information.
 */
/** @file space_partition.h
 *
 */
 
#ifndef RT_SPACE_PARTITION_H
#define RT_SPACE_PARTITION_H
 
#include "common.h"
#include "vmath.h"
#include "bu/malloc.h"
#include "bn/tol.h"
#include "rt/defines.h"
#include "rt/application.h"
#include "rt/soltab.h"
 
__BEGIN_DECLS
 
struct rt_piecelist;  /* forward declaration */
 
/**
 * Structures for space subdivision.
 *
 * cut_type is an integer for efficiency of access in rt_shootray() on
 * non-word addressing machines.
 *
 * If a solid has 'pieces', it will be listed either in bn_list
 * (initially), or in bn_piecelist, but not both.
 */
struct cutnode {
    int         cn_type;
    int         cn_axis;                /**< @brief 0, 1, 2 = cut along X, Y, Z */
    fastf_t             cn_point;       /**< @brief cut through axis==point */
    union cutter *      cn_l;           /**< @brief val < point */
    union cutter *      cn_r;           /**< @brief val >= point */
};
 
struct boxnode {
    int         bn_type;
    fastf_t             bn_min[3];
    fastf_t             bn_max[3];
    struct soltab **bn_list;            /**< @brief bn_list[bn_len] */
    size_t              bn_len;         /**< @brief # of solids in list */
    size_t              bn_maxlen;      /**< @brief # of ptrs allocated to list */
    struct rt_piecelist *bn_piecelist;  /**< @brief [] solids with pieces */
    size_t              bn_piecelen;    /**< @brief # of piecelists used */
    size_t              bn_maxpiecelen; /**< @brief # of piecelists allocated */
};
 
 
#define CUT_CUTNODE     1
#define CUT_BOXNODE     2
#define CUT_MAXIMUM     2
union cutter {
    int cut_type;
    union cutter *cut_forw;     /**< @brief Freelist forward link */
    struct cutnode cn;
    struct boxnode bn;
};
 
 
#define CUTTER_NULL     ((union cutter *)0)
 
/**
 * Print out a cut tree.
 *
 * lvl is recursion level.
 */
RT_EXPORT extern void rt_pr_cut(const union cutter *cutp,
                                int lvl);
 
struct rt_i;     /*forward declaration */
struct resource; /*forward declaration */
struct soltab;   /*forward declaration */
RT_EXPORT extern void rt_pr_cut_info(const struct rt_i  *rtip,
                                     const char         *str);
RT_EXPORT extern void remove_from_bsp(struct soltab *stp,
                                      union cutter *cutp,
                                      struct bn_tol *tol);
RT_EXPORT extern void insert_in_bsp(struct soltab *stp,
                                    union cutter *cutp);
RT_EXPORT extern void fill_out_bsp(struct rt_i *rtip,
                                   union cutter *cutp,
                                   struct resource *resp,
                                   fastf_t bb[6]);
 
/**
 * Add a solid into a given boxnode, extending the lists there.  This
 * is used only for building the root node, which will then be
 * subdivided.
 *
 * Solids with pieces go onto a special list.
 */
RT_EXPORT extern void rt_cut_extend(union cutter *cutp,
                                    struct soltab *stp,
                                    const struct rt_i *rtip);
 
/**
 * Return pointer to cell 'n' along a given ray.  Used for debugging
 * of how space partitioning interacts with shootray.  Intended to
 * mirror the operation of rt_shootray().  The first cell is 0.
 */
RT_EXPORT extern const union cutter *rt_cell_n_on_ray(struct application *ap,
                                                      int n);
/*
 * The rtip->rti_CutFree list can not be freed directly because is
 * bulk allocated.  Fortunately, we have a list of all the
 * bu_malloc()'ed blocks.  This routine may be called before the first
 * frame is done, so it must be prepared for uninitialized items.
 */
RT_EXPORT extern void rt_cut_clean(struct rt_i *rtip);
 
 
#ifdef USE_OPENCL
struct clt_bvh_bounds {
    cl_double p_min[3], p_max[3];
};
 
struct clt_linear_bvh_node {
    struct clt_bvh_bounds bounds;
    union {
        cl_int primitives_offset;       /* leaf */
        cl_int second_child_offset;     /* interior */
    } u;
    cl_ushort n_primitives;             /* 0 -> interior node */
    cl_uchar axis;                      /* interior node: xyz */
    cl_uchar pad[1];                    /* ensure 32 byte total size */
};
 
 
RT_EXPORT extern void
clt_linear_bvh_create(long n_primitives, struct clt_linear_bvh_node **nodes_p,
                      long **ordered_prims, const fastf_t *centroids_prims,
                      const fastf_t *bounds_prims, cl_int *total_nodes);
#endif
 
 
__END_DECLS
 
#endif /* RT_SPACE_PARTITION_H */
 
/*
 * Local Variables:
 * tab-width: 8
 * mode: C
 * indent-tabs-mode: t
 * c-file-style: "stroustrup"
 * End:
 * ex: shiftwidth=4 tabstop=8
 */