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Added local stack during bvh transversal

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This commit is contained in:
Andre Susano Pinto
2009-07-08 10:40:26 +00:00
parent 5b75ea38ff
commit f90a0b8383
1 changed files with 55 additions and 0 deletions
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55
source/blender/render/intern/source/rayobject_bvh.c
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@@ -37,6 +37,7 @@
#include "rayobject_rtbuild.h"
#include "rayobject.h"
#define DFS_STACK_SIZE 64
#define DYNAMIC_ALLOC
//#define SPLIT_OVERLAP_MEAN_LONGEST_AXIS /* objects mean split on the longest axis, childs BB are allowed to overlap */
@@ -47,6 +48,7 @@
typedef struct BVHTree BVHTree;
static int bvh_intersect(BVHTree *obj, Isect *isec);
static int bvh_intersect_stack(BVHTree *obj, Isect *isec);
static void bvh_add(BVHTree *o, RayObject *ob);
static void bvh_done(BVHTree *o);
static void bvh_free(BVHTree *o);
@@ -54,7 +56,11 @@ static void bvh_bb(BVHTree *o, float *min, float *max);
static RayObjectAPI bvh_api =
{
#ifdef DFS_STACK_SIZE
(RE_rayobject_raycast_callback) bvh_intersect_stack,
#else
(RE_rayobject_raycast_callback) bvh_intersect,
#endif
(RE_rayobject_add_callback) bvh_add,
(RE_rayobject_done_callback) bvh_done,
(RE_rayobject_free_callback) bvh_free,
@@ -150,6 +156,55 @@ static void bvh_bb(BVHTree *obj, float *min, float *max)
/*
* Tree transverse
*/
static int dfs_raycast_stack(BVHNode *root, Isect *isec)
{
BVHNode *stack[DFS_STACK_SIZE];
int hit = 0, stack_pos = 0;
stack[stack_pos++] = root;
while(stack_pos)
{
BVHNode *node = stack[--stack_pos];
if(RayObject_isAligned(node))
{
if(RE_rayobject_bb_intersect(isec, (const float*)node->bb) != FLT_MAX)
{
//push nodes in reverse visit order
if(isec->idot_axis[node->split_axis] < 0.0f)
{
int i;
for(i=0; i<BVH_NCHILDS; i++)
if(node->child[i] == 0) break;
else stack[stack_pos++] = node->child[i];
}
else
{
int i;
for(i=0; i<BVH_NCHILDS; i++)
if(node->child[i] != 0) stack[stack_pos++] = node->child[i];
else break;
}
assert(stack_pos <= DFS_STACK_SIZE);
}
}
else
{
hit |= RE_rayobject_intersect( (RayObject*)node, isec);
if(hit && isec->mode == RE_RAY_SHADOW) return hit;
}
}
return hit;
}
static int bvh_intersect_stack(BVHTree *obj, Isect *isec)
{
if(RayObject_isAligned(obj->root))
return dfs_raycast_stack(obj->root, isec);
else
return RE_rayobject_intersect( (RayObject*)obj->root, isec);
}
static int dfs_raycast(BVHNode *node, Isect *isec)
{
int hit = 0;