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[qfvis] Make cluster reconstruction O(N)

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For most (if not all) maps. The heapsort is needed only if the clustered
leafs are not contiguous, but most bsp compilers output contiguous leaf
clusters, so is just a bit of protection. The difference isn't really
noticeable on a fast machine, but no point in doing more work than
necessary.
This commit is contained in:
Bill Currie 2021-08-06 13:47:56 +09:00
parent b320c3352f
commit 9a93bf8d4a
1 changed files with 14 additions and 5 deletions
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19
tools/qfvis/source/fatpvs.c
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@ -260,15 +260,24 @@ static void
reconstruct_clusters (void)
{
leafvis = malloc (num_leafs * sizeof (leafvis_t));
int sorted = 1;
num_clusters = 1;
for (unsigned i = 0; i < num_leafs; i++) {
leafvis[i].visoffs = bsp->leafs[i + 1].visofs;
leafvis[i].leafnum = i;
if (i > 0) {
num_clusters += leafvis[i].visoffs != leafvis[i - 1].visoffs;
if (leafvis[i].visoffs < leafvis[i - 1].visoffs) {
sorted = 0;
}
}
}
heapsort (leafvis, num_leafs, sizeof (leafvis_t), leaf_compare);
num_clusters = 1;
for (unsigned i = 1; i < num_leafs; i++) {
num_clusters += leafvis[i].visoffs != leafvis[i - 1].visoffs;
if (!sorted) {
heapsort (leafvis, num_leafs, sizeof (leafvis_t), leaf_compare);
num_clusters = 1;
for (unsigned i = 1; i < num_leafs; i++) {
num_clusters += leafvis[i].visoffs != leafvis[i - 1].visoffs;
}
}
leafcluster = malloc (num_leafs * sizeof (uint32_t));