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91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
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// This code written in 2010 by Forest Hale (lordhavoc ghdigital com), and placed into public domain.
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// Based on information in http://zach.in.tu-clausthal.de/papers/vrst02.html (in particular vrst02_boxtree.pdf)
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#ifndef BIH_H
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#define BIH_H
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#define BIH_MAXUNORDEREDCHILDREN 8
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typedef enum biherror_e
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{
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BIHERROR_OK, // no error, be happy
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BIHERROR_OUT_OF_NODES // could not produce complete hierarchy, maxnodes too low (should be roughly half of numleafs)
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}
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biherror_t;
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typedef enum bih_nodetype_e
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{
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BIH_SPLITX = 0,
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BIH_SPLITY = 1,
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BIH_SPLITZ = 2,
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BIH_UNORDERED = 3,
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}
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bih_nodetype_t;
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typedef enum bih_leaftype_e
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{
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BIH_BRUSH = 4,
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BIH_COLLISIONTRIANGLE = 5,
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BIH_RENDERTRIANGLE = 6
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}
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bih_leaftype_t;
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typedef struct bih_node_s
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{
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bih_nodetype_t type; // = BIH_SPLITX and similar values
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// TODO: store just one float for distance, and have BIH_SPLITMINX and BIH_SPLITMAXX distinctions, to reduce memory footprint and traversal time, as described in the paper (vrst02_boxtree.pdf)
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// TODO: move bounds data to parent node and remove it from leafs?
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float mins[3];
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float maxs[3];
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// node indexes of children (always > this node's index)
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int front;
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int back;
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// interval of children
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float frontmin; // children[0]
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float backmax; // children[1]
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// BIH_UNORDERED uses this for a list of leafindex (all >= 0), -1 = end of list
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int children[BIH_MAXUNORDEREDCHILDREN];
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}
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bih_node_t;
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typedef struct bih_leaf_s
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{
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bih_leaftype_t type; // = BIH_BRUSH And similar values
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float mins[3];
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float maxs[3];
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// data past this point is generic and entirely up to the caller...
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int textureindex;
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int surfaceindex;
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int itemindex; // triangle or brush index
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}
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bih_leaf_t;
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typedef struct bih_s
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{
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// permanent fields
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// leafs are constructed by caller before calling BIH_Build
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int numleafs;
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bih_leaf_t *leafs;
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// nodes are constructed by BIH_Build
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int numnodes;
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bih_node_t *nodes;
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int rootnode; // 0 if numnodes > 0, -1 otherwise
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// bounds calculated by BIH_Build
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float mins[3];
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float maxs[3];
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// fields used only during BIH_Build:
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int maxnodes;
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int error; // set to a value if an error occurs in building (such as numnodes == maxnodes)
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int *leafsort;
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int *leafsortscratch;
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}
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bih_t;
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int BIH_Build(bih_t *bih, int numleafs, bih_leaf_t *leafs, int maxnodes, bih_node_t *nodes, int *temp_leafsort, int *temp_leafsortscratch);
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int BIH_GetTriangleListForBox(const bih_t *bih, int maxtriangles, int *trianglelist_idx, int *trianglelist_surf, const float *mins, const float *maxs);
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#endif
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