diff options
Diffstat (limited to 'libdimension')
| -rw-r--r-- | libdimension/prtree.c | 212 |
1 files changed, 115 insertions, 97 deletions
diff --git a/libdimension/prtree.c b/libdimension/prtree.c index ba26d30..c012e6f 100644 --- a/libdimension/prtree.c +++ b/libdimension/prtree.c @@ -1,5 +1,5 @@ /************************************************************************* - * Copyright (C) 2010-2012 Tavian Barnes <tavianator@tavianator.com> * + * Copyright (C) 2010-2013 Tavian Barnes <tavianator@tavianator.com> * * * * This file is part of The Dimension Library. * * * @@ -57,78 +57,54 @@ enum { DMNSN_ZMAX }; -/** Get a coordinate of the bounding box of a node. */ -static inline double -dmnsn_get_coordinate(const dmnsn_bvh_node * const *node, int comparator) -{ - switch (comparator) { - case DMNSN_XMIN: - return (*node)->bounding_box.min.x; - case DMNSN_YMIN: - return (*node)->bounding_box.min.y; - case DMNSN_ZMIN: - return (*node)->bounding_box.min.z; - - case DMNSN_XMAX: - return -(*node)->bounding_box.max.x; - case DMNSN_YMAX: - return -(*node)->bounding_box.max.y; - case DMNSN_ZMAX: - return -(*node)->bounding_box.max.z; - - default: - dmnsn_unreachable("Invalid comparator."); - } -} - /* List sorting comparators */ static int dmnsn_xmin_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_XMIN); - double rval = dmnsn_get_coordinate(r, DMNSN_XMIN); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.min.x; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.min.x; return (lval > rval) - (lval < rval); } static int dmnsn_ymin_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_YMIN); - double rval = dmnsn_get_coordinate(r, DMNSN_YMIN); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.min.y; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.min.y; return (lval > rval) - (lval < rval); } static int dmnsn_zmin_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_ZMIN); - double rval = dmnsn_get_coordinate(r, DMNSN_ZMIN); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.min.z; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.min.z; return (lval > rval) - (lval < rval); } static int dmnsn_xmax_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_XMAX); - double rval = dmnsn_get_coordinate(r, DMNSN_XMAX); - return (lval > rval) - (lval < rval); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.max.x; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.max.x; + return (lval < rval) - (lval > rval); } static int dmnsn_ymax_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_YMAX); - double rval = dmnsn_get_coordinate(r, DMNSN_YMAX); - return (lval > rval) - (lval < rval); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.max.y; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.max.y; + return (lval < rval) - (lval > rval); } static int dmnsn_zmax_comp(const void *l, const void *r) { - double lval = dmnsn_get_coordinate(l, DMNSN_ZMAX); - double rval = dmnsn_get_coordinate(r, DMNSN_ZMAX); - return (lval > rval) - (lval < rval); + double lval = (*(const dmnsn_bvh_node **)l)->bounding_box.max.z; + double rval = (*(const dmnsn_bvh_node **)r)->bounding_box.max.z; + return (lval < rval) - (lval > rval); } /** All comparators. */ @@ -138,19 +114,20 @@ static dmnsn_array_comparator_fn *const dmnsn_comparators[DMNSN_PSEUDO_B] = { [DMNSN_ZMIN] = dmnsn_zmin_comp, [DMNSN_XMAX] = dmnsn_xmax_comp, [DMNSN_YMAX] = dmnsn_ymax_comp, - [DMNSN_ZMAX] = dmnsn_zmax_comp + [DMNSN_ZMAX] = dmnsn_zmax_comp, }; /** Add the priority leaves for this level. */ static void -dmnsn_add_priority_leaves(dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B], +dmnsn_add_priority_leaves(dmnsn_bvh_node **sorted_leaves[DMNSN_PSEUDO_B], + size_t nleaves, dmnsn_array *new_leaves) { for (size_t i = 0; i < DMNSN_PSEUDO_B; ++i) { dmnsn_bvh_node *leaf = NULL; - dmnsn_bvh_node **leaves = dmnsn_array_first(sorted_leaves[i]); - for (size_t j = 0, size = dmnsn_array_size(sorted_leaves[i]); - j < size && (!leaf || leaf->nchildren < DMNSN_PRTREE_B); + dmnsn_bvh_node **leaves = sorted_leaves[i]; + for (size_t j = 0; + j < nleaves && (!leaf || leaf->nchildren < DMNSN_PRTREE_B); ++j) { /* Skip all the previously found extreme nodes */ @@ -173,80 +150,112 @@ dmnsn_add_priority_leaves(dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B], } } -/** Split the sorted lists into the left and right subtrees. */ -static bool -dmnsn_split_sorted_leaves(dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B], - dmnsn_array *right_sorted_leaves[DMNSN_PSEUDO_B], - size_t i) +static void +dmnsn_split_sorted_leaves_easy(dmnsn_bvh_node **leaves, + size_t *nleaves, + size_t *nright_leaves) { /* Get rid of the extreme nodes */ - dmnsn_bvh_node **leaves = dmnsn_array_first(sorted_leaves[i]); - size_t j, skip; - for (j = 0, skip = 0; j < dmnsn_array_size(sorted_leaves[i]); ++j) { - if (leaves[j]->data == DMNSN_PRTREE_LEAF) { + size_t i, skip, size = *nleaves; + for (i = 0, skip = 0; i < size; ++i) { + if (leaves[i]->data == DMNSN_PRTREE_LEAF) { ++skip; } else { - leaves[j - skip] = leaves[j]; + leaves[i - skip] = leaves[i]; } } - dmnsn_array_resize(sorted_leaves[i], j - skip); - if (dmnsn_array_size(sorted_leaves[i]) == 0) { - return false; + size -= skip; + + /* Split the leaves and mark the left and right child nodes */ + size_t left_size = (size + 1)/2; + for (i = 0; i < left_size; ++i) { + leaves[i]->data = DMNSN_PRTREE_LEFT; + } + for (i = left_size; i < size; ++i) { + leaves[i]->data = DMNSN_PRTREE_RIGHT; } - /* Split the appropriate list and mark the left and right child nodes */ - right_sorted_leaves[i] = dmnsn_array_split(sorted_leaves[i]); - DMNSN_ARRAY_FOREACH (dmnsn_bvh_node **, node, sorted_leaves[i]) { - (*node)->data = DMNSN_PRTREE_LEFT; + *nleaves = left_size; + *nright_leaves = size - left_size; +} + +static void +dmnsn_split_sorted_leaves_hard(dmnsn_bvh_node **leaves, + dmnsn_bvh_node **buffer, + size_t nleaves) +{ + size_t i, j, skip; + for (i = 0, j = 0, skip = 0; i < nleaves; ++i) { + if (leaves[i]->data == DMNSN_PRTREE_LEFT) { + leaves[i - skip] = leaves[i]; + } else { + if (leaves[i]->data == DMNSN_PRTREE_RIGHT) { + buffer[j] = leaves[i]; + ++j; + } + ++skip; + } } - DMNSN_ARRAY_FOREACH (dmnsn_bvh_node **, node, right_sorted_leaves[i]) { - (*node)->data = DMNSN_PRTREE_RIGHT; + + size_t left_size = i - skip; + for (i = 0; i < j; ++i) { + leaves[left_size + i] = buffer[i]; } +} + +/** Split the sorted lists into the left and right subtrees. */ +static void +dmnsn_split_sorted_leaves(dmnsn_bvh_node **sorted_leaves[DMNSN_PSEUDO_B], + size_t *nleaves, + dmnsn_bvh_node **right_sorted_leaves[DMNSN_PSEUDO_B], + size_t *nright_leaves, + dmnsn_bvh_node **buffer, + size_t i) +{ + size_t original_size = *nleaves; + + /* Split the ith list */ + dmnsn_split_sorted_leaves_easy(sorted_leaves[i], nleaves, nright_leaves); /* Split the rest of the lists */ for (size_t j = 0; j < DMNSN_PSEUDO_B; ++j) { - if (j != i) { - right_sorted_leaves[j] = dmnsn_new_array(sizeof(dmnsn_bvh_node *)); - - dmnsn_bvh_node **leaves = dmnsn_array_first(sorted_leaves[j]); - size_t k, skip; - for (k = 0, skip = 0; k < dmnsn_array_size(sorted_leaves[j]); ++k) { - if (leaves[k]->data == DMNSN_PRTREE_LEAF) { - ++skip; - } else if (leaves[k]->data == DMNSN_PRTREE_RIGHT) { - dmnsn_array_push(right_sorted_leaves[j], &leaves[k]); - ++skip; - } else { - leaves[k - skip] = leaves[k]; - } - } - dmnsn_array_resize(sorted_leaves[j], k - skip); + right_sorted_leaves[j] = sorted_leaves[j] + *nleaves; + if (j == i) { + continue; } - } - return true; + dmnsn_split_sorted_leaves_hard(sorted_leaves[j], buffer, original_size); + } } /** Recursively constructs an implicit pseudo-PR-tree and collects the priority leaves. */ static void -dmnsn_priority_leaves_recursive(dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B], +dmnsn_priority_leaves_recursive(dmnsn_bvh_node **sorted_leaves[DMNSN_PSEUDO_B], + size_t nleaves, + dmnsn_bvh_node **buffer, dmnsn_array *new_leaves, int comparator) { - dmnsn_add_priority_leaves(sorted_leaves, new_leaves); + dmnsn_add_priority_leaves(sorted_leaves, nleaves, new_leaves); + + dmnsn_bvh_node **right_sorted_leaves[DMNSN_PSEUDO_B]; + size_t right_nleaves; - dmnsn_array *right_sorted_leaves[DMNSN_PSEUDO_B]; - if (dmnsn_split_sorted_leaves(sorted_leaves, right_sorted_leaves, comparator)) - { - dmnsn_priority_leaves_recursive(right_sorted_leaves, new_leaves, + dmnsn_split_sorted_leaves(sorted_leaves, &nleaves, + right_sorted_leaves, &right_nleaves, + buffer, comparator); + + if (nleaves > 0) { + dmnsn_priority_leaves_recursive(sorted_leaves, nleaves, + buffer, new_leaves, (comparator + 1)%DMNSN_PSEUDO_B); - for (size_t i = 0; i < DMNSN_PSEUDO_B; ++i) { - dmnsn_delete_array(right_sorted_leaves[i]); - } + } - dmnsn_priority_leaves_recursive(sorted_leaves, new_leaves, + if (right_nleaves > 0) { + dmnsn_priority_leaves_recursive(right_sorted_leaves, right_nleaves, + buffer, new_leaves, (comparator + 1)%DMNSN_PSEUDO_B); } } @@ -255,17 +264,26 @@ dmnsn_priority_leaves_recursive(dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B], static dmnsn_array * dmnsn_priority_leaves(const dmnsn_array *leaves) { - dmnsn_array *sorted_leaves[DMNSN_PSEUDO_B]; + dmnsn_bvh_node **leaves_arr = dmnsn_array_first(leaves); + dmnsn_bvh_node **sorted_leaves[DMNSN_PSEUDO_B]; + size_t nleaves = dmnsn_array_size(leaves); + size_t leaves_size = nleaves*sizeof(dmnsn_bvh_node *); + for (size_t i = 0; i < DMNSN_PSEUDO_B; ++i) { - sorted_leaves[i] = dmnsn_array_copy(leaves); - dmnsn_array_sort(sorted_leaves[i], dmnsn_comparators[i]); + sorted_leaves[i] = dmnsn_malloc(leaves_size); + memcpy(sorted_leaves[i], leaves_arr, leaves_size); + qsort(sorted_leaves[i], nleaves, sizeof(dmnsn_bvh_node *), + dmnsn_comparators[i]); } dmnsn_array *new_leaves = dmnsn_new_array(sizeof(dmnsn_bvh_node *)); - dmnsn_priority_leaves_recursive(sorted_leaves, new_leaves, 0); + dmnsn_bvh_node **buffer = dmnsn_malloc(leaves_size/2); + dmnsn_priority_leaves_recursive(sorted_leaves, nleaves, buffer, new_leaves, + 0); + dmnsn_free(buffer); for (size_t i = 0; i < DMNSN_PSEUDO_B; ++i) { - dmnsn_delete_array(sorted_leaves[i]); + dmnsn_free(sorted_leaves[i]); } return new_leaves; |