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rewrite R_SplitEntityOnNode to be itterative rather than recursive (using

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a static `stack') to avoid the function call overhead. this cuts about 40%
of the execution time from this function.

No matter what I tried, best results were obtained using __builtin_expect,
so make sure non-gcc compilers do the right thing when they encounter it.
This commit is contained in:
Bill Currie 2002-04-25 04:32:55 +00:00
parent 2b2c0401cf
commit da994c16e5
2 changed files with 55 additions and 45 deletions
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1
include/QF/gcc_attr.h
View file

@ -31,6 +31,7 @@
#ifndef __GNUC__
# define __attribute__(x)
# define __builtin_expect(x,c) x
#endif
#endif // __gcc_attr_h

99
libs/video/renderer/r_efrag.c
View file

@ -87,6 +87,10 @@ R_RemoveEfrags (entity_t *ent)
ent->efrag = NULL;
}
#define NODE_STACK_SIZE 1024
static mnode_t *node_stack[NODE_STACK_SIZE];
static mnode_t **node_ptr = node_stack + NODE_STACK_SIZE;
void
R_SplitEntityOnNode (mnode_t *node)
{
@ -95,56 +99,61 @@ R_SplitEntityOnNode (mnode_t *node)
mleaf_t *leaf;
int sides;
if (node->contents == CONTENTS_SOLID) {
return;
}
*--node_ptr = 0;
// add an efrag if the node is a leaf
if (node->contents < 0) {
if (!r_pefragtopnode)
r_pefragtopnode = node;
while (node) {
// add an efrag if the node is a leaf
if (__builtin_expect (node->contents < 0, 0)) {
if (!r_pefragtopnode)
r_pefragtopnode = node;
leaf = (mleaf_t *) node;
leaf = (mleaf_t *) node;
// grab an efrag off the free list
ef = r_free_efrags;
if (!ef) {
Con_Printf ("Too many efrags!\n");
return; // no free fragments...
// grab an efrag off the free list
ef = r_free_efrags;
if (__builtin_expect (!ef, 0)) {
Con_Printf ("Too many efrags!\n");
return; // no free fragments...
}
r_free_efrags = r_free_efrags->entnext;
ef->entity = r_addent;
// add the entity link
*lastlink = ef;
lastlink = &ef->entnext;
ef->entnext = NULL;
// set the leaf links
ef->leaf = leaf;
ef->leafnext = leaf->efrags;
leaf->efrags = ef;
node = *node_ptr++;
} else {
// NODE_MIXED
splitplane = node->plane;
sides = BOX_ON_PLANE_SIDE (r_emins, r_emaxs, splitplane);
if (sides == 3) {
// split on this plane
// if this is the first splitter of this bmodel, remember it
if (!r_pefragtopnode)
r_pefragtopnode = node;
}
// recurse down the contacted sides
if (sides & 1 && node->children[0]->contents != CONTENTS_SOLID) {
if (sides & 2 && node->children[1]->contents != CONTENTS_SOLID)
*--node_ptr = node->children[1];
node = node->children[0];
} else {
if (sides & 2 && node->children[1]->contents != CONTENTS_SOLID)
node = node->children[1];
else
node = *node_ptr++;
}
}
r_free_efrags = r_free_efrags->entnext;
ef->entity = r_addent;
// add the entity link
*lastlink = ef;
lastlink = &ef->entnext;
ef->entnext = NULL;
// set the leaf links
ef->leaf = leaf;
ef->leafnext = leaf->efrags;
leaf->efrags = ef;
return;
}
// NODE_MIXED
splitplane = node->plane;
sides = BOX_ON_PLANE_SIDE (r_emins, r_emaxs, splitplane);
if (sides == 3) {
// split on this plane
// if this is the first splitter of this bmodel, remember it
if (!r_pefragtopnode)
r_pefragtopnode = node;
}
// recurse down the contacted sides
if (sides & 1)
R_SplitEntityOnNode (node->children[0]);
if (sides & 2)
R_SplitEntityOnNode (node->children[1]);
}
void