forked from bartvdbraak/blender
2ecbc3b777
Matches better naming of volume traversal files, where we've got optimized versions of a single step of volume intersection and traversal which will gather all volume intersections.
387 lines
11 KiB
C
387 lines
11 KiB
C
/*
|
|
* Adapted from code Copyright 2009-2010 NVIDIA Corporation,
|
|
* and code copyright 2009-2012 Intel Corporation
|
|
*
|
|
* Modifications Copyright 2011-2013, Blender Foundation.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifdef __QBVH__
|
|
# include "qbvh_shadow_all.h"
|
|
#endif
|
|
|
|
#if BVH_FEATURE(BVH_HAIR)
|
|
# define NODE_INTERSECT bvh_node_intersect
|
|
#else
|
|
# define NODE_INTERSECT bvh_aligned_node_intersect
|
|
#endif
|
|
|
|
/* This is a template BVH traversal function, where various features can be
|
|
* enabled/disabled. This way we can compile optimized versions for each case
|
|
* without new features slowing things down.
|
|
*
|
|
* BVH_INSTANCING: object instancing
|
|
* BVH_HAIR: hair curve rendering
|
|
* BVH_MOTION: motion blur rendering
|
|
*
|
|
*/
|
|
|
|
ccl_device bool BVH_FUNCTION_FULL_NAME(BVH)(KernelGlobals *kg,
|
|
const Ray *ray,
|
|
Intersection *isect_array,
|
|
const uint max_hits,
|
|
uint *num_hits)
|
|
{
|
|
/* todo:
|
|
* - likely and unlikely for if() statements
|
|
* - test restrict attribute for pointers
|
|
*/
|
|
|
|
/* traversal stack in CUDA thread-local memory */
|
|
int traversalStack[BVH_STACK_SIZE];
|
|
traversalStack[0] = ENTRYPOINT_SENTINEL;
|
|
|
|
/* traversal variables in registers */
|
|
int stackPtr = 0;
|
|
int nodeAddr = kernel_data.bvh.root;
|
|
|
|
/* ray parameters in registers */
|
|
const float tmax = ray->t;
|
|
float3 P = ray->P;
|
|
float3 dir = bvh_clamp_direction(ray->D);
|
|
float3 idir = bvh_inverse_direction(dir);
|
|
int object = OBJECT_NONE;
|
|
float isect_t = tmax;
|
|
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
Transform ob_itfm;
|
|
#endif
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
int num_hits_in_instance = 0;
|
|
#endif
|
|
|
|
*num_hits = 0;
|
|
isect_array->t = tmax;
|
|
|
|
#if defined(__KERNEL_SSE2__)
|
|
const shuffle_swap_t shuf_identity = shuffle_swap_identity();
|
|
const shuffle_swap_t shuf_swap = shuffle_swap_swap();
|
|
|
|
const ssef pn = cast(ssei(0, 0, 0x80000000, 0x80000000));
|
|
ssef Psplat[3], idirsplat[3];
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
ssef tnear(0.0f), tfar(isect_t);
|
|
# endif
|
|
shuffle_swap_t shufflexyz[3];
|
|
|
|
Psplat[0] = ssef(P.x);
|
|
Psplat[1] = ssef(P.y);
|
|
Psplat[2] = ssef(P.z);
|
|
|
|
ssef tsplat(0.0f, 0.0f, -isect_t, -isect_t);
|
|
|
|
gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz);
|
|
#endif /* __KERNEL_SSE2__ */
|
|
|
|
IsectPrecalc isect_precalc;
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
/* traversal loop */
|
|
do {
|
|
do {
|
|
/* traverse internal nodes */
|
|
while(nodeAddr >= 0 && nodeAddr != ENTRYPOINT_SENTINEL) {
|
|
int nodeAddrChild1, traverse_mask;
|
|
float dist[2];
|
|
float4 cnodes = kernel_tex_fetch(__bvh_nodes, nodeAddr+0);
|
|
|
|
#if !defined(__KERNEL_SSE2__)
|
|
traverse_mask = NODE_INTERSECT(kg,
|
|
P,
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
dir,
|
|
# endif
|
|
idir,
|
|
isect_t,
|
|
nodeAddr,
|
|
PATH_RAY_SHADOW,
|
|
dist);
|
|
#else // __KERNEL_SSE2__
|
|
traverse_mask = NODE_INTERSECT(kg,
|
|
P,
|
|
dir,
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
tnear,
|
|
tfar,
|
|
# endif
|
|
tsplat,
|
|
Psplat,
|
|
idirsplat,
|
|
shufflexyz,
|
|
nodeAddr,
|
|
PATH_RAY_SHADOW,
|
|
dist);
|
|
#endif // __KERNEL_SSE2__
|
|
|
|
nodeAddr = __float_as_int(cnodes.z);
|
|
nodeAddrChild1 = __float_as_int(cnodes.w);
|
|
|
|
if(traverse_mask == 3) {
|
|
/* Both children were intersected, push the farther one. */
|
|
bool closestChild1 = (dist[1] < dist[0]);
|
|
|
|
if(closestChild1) {
|
|
int tmp = nodeAddr;
|
|
nodeAddr = nodeAddrChild1;
|
|
nodeAddrChild1 = tmp;
|
|
}
|
|
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_STACK_SIZE);
|
|
traversalStack[stackPtr] = nodeAddrChild1;
|
|
}
|
|
else {
|
|
/* One child was intersected. */
|
|
if(traverse_mask == 2) {
|
|
nodeAddr = nodeAddrChild1;
|
|
}
|
|
else if(traverse_mask == 0) {
|
|
/* Neither child was intersected. */
|
|
nodeAddr = traversalStack[stackPtr];
|
|
--stackPtr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if node is leaf, fetch triangle list */
|
|
if(nodeAddr < 0) {
|
|
float4 leaf = kernel_tex_fetch(__bvh_leaf_nodes, (-nodeAddr-1));
|
|
int primAddr = __float_as_int(leaf.x);
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
if(primAddr >= 0) {
|
|
#endif
|
|
const int primAddr2 = __float_as_int(leaf.y);
|
|
const uint type = __float_as_int(leaf.w);
|
|
const uint p_type = type & PRIMITIVE_ALL;
|
|
|
|
/* pop */
|
|
nodeAddr = traversalStack[stackPtr];
|
|
--stackPtr;
|
|
|
|
/* primitive intersection */
|
|
while(primAddr < primAddr2) {
|
|
kernel_assert(kernel_tex_fetch(__prim_type, primAddr) == type);
|
|
|
|
bool hit;
|
|
|
|
/* todo: specialized intersect functions which don't fill in
|
|
* isect unless needed and check SD_HAS_TRANSPARENT_SHADOW?
|
|
* might give a few % performance improvement */
|
|
|
|
switch(p_type) {
|
|
case PRIMITIVE_TRIANGLE: {
|
|
hit = triangle_intersect(kg, &isect_precalc, isect_array, P, PATH_RAY_SHADOW, object, primAddr);
|
|
break;
|
|
}
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
case PRIMITIVE_MOTION_TRIANGLE: {
|
|
hit = motion_triangle_intersect(kg, isect_array, P, dir, ray->time, PATH_RAY_SHADOW, object, primAddr);
|
|
break;
|
|
}
|
|
#endif
|
|
#if BVH_FEATURE(BVH_HAIR)
|
|
case PRIMITIVE_CURVE:
|
|
case PRIMITIVE_MOTION_CURVE: {
|
|
if(kernel_data.curve.curveflags & CURVE_KN_INTERPOLATE)
|
|
hit = bvh_cardinal_curve_intersect(kg, isect_array, P, dir, PATH_RAY_SHADOW, object, primAddr, ray->time, type, NULL, 0, 0);
|
|
else
|
|
hit = bvh_curve_intersect(kg, isect_array, P, dir, PATH_RAY_SHADOW, object, primAddr, ray->time, type, NULL, 0, 0);
|
|
break;
|
|
}
|
|
#endif
|
|
default: {
|
|
hit = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* shadow ray early termination */
|
|
if(hit) {
|
|
/* detect if this surface has a shader with transparent shadows */
|
|
|
|
/* todo: optimize so primitive visibility flag indicates if
|
|
* the primitive has a transparent shadow shader? */
|
|
int prim = kernel_tex_fetch(__prim_index, isect_array->prim);
|
|
int shader = 0;
|
|
|
|
#ifdef __HAIR__
|
|
if(kernel_tex_fetch(__prim_type, isect_array->prim) & PRIMITIVE_ALL_TRIANGLE)
|
|
#endif
|
|
{
|
|
shader = kernel_tex_fetch(__tri_shader, prim);
|
|
}
|
|
#ifdef __HAIR__
|
|
else {
|
|
float4 str = kernel_tex_fetch(__curves, prim);
|
|
shader = __float_as_int(str.z);
|
|
}
|
|
#endif
|
|
int flag = kernel_tex_fetch(__shader_flag, (shader & SHADER_MASK)*2);
|
|
|
|
/* if no transparent shadows, all light is blocked */
|
|
if(!(flag & SD_HAS_TRANSPARENT_SHADOW)) {
|
|
return true;
|
|
}
|
|
/* if maximum number of hits reached, block all light */
|
|
else if(*num_hits == max_hits) {
|
|
return true;
|
|
}
|
|
|
|
/* move on to next entry in intersections array */
|
|
isect_array++;
|
|
(*num_hits)++;
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
num_hits_in_instance++;
|
|
#endif
|
|
|
|
isect_array->t = isect_t;
|
|
}
|
|
|
|
primAddr++;
|
|
}
|
|
}
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
else {
|
|
/* instance push */
|
|
object = kernel_tex_fetch(__prim_object, -primAddr-1);
|
|
|
|
# if BVH_FEATURE(BVH_MOTION)
|
|
bvh_instance_motion_push(kg, object, ray, &P, &dir, &idir, &isect_t, &ob_itfm);
|
|
# else
|
|
bvh_instance_push(kg, object, ray, &P, &dir, &idir, &isect_t);
|
|
# endif
|
|
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
num_hits_in_instance = 0;
|
|
isect_array->t = isect_t;
|
|
|
|
# if defined(__KERNEL_SSE2__)
|
|
Psplat[0] = ssef(P.x);
|
|
Psplat[1] = ssef(P.y);
|
|
Psplat[2] = ssef(P.z);
|
|
|
|
tsplat = ssef(0.0f, 0.0f, -isect_t, -isect_t);
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
tfar = ssef(isect_t);
|
|
# endif
|
|
gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz);
|
|
# endif
|
|
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_STACK_SIZE);
|
|
traversalStack[stackPtr] = ENTRYPOINT_SENTINEL;
|
|
|
|
nodeAddr = kernel_tex_fetch(__object_node, object);
|
|
}
|
|
}
|
|
#endif /* FEATURE(BVH_INSTANCING) */
|
|
} while(nodeAddr != ENTRYPOINT_SENTINEL);
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
if(stackPtr >= 0) {
|
|
kernel_assert(object != OBJECT_NONE);
|
|
|
|
if(num_hits_in_instance) {
|
|
float t_fac;
|
|
|
|
# if BVH_FEATURE(BVH_MOTION)
|
|
bvh_instance_motion_pop_factor(kg, object, ray, &P, &dir, &idir, &t_fac, &ob_itfm);
|
|
# else
|
|
bvh_instance_pop_factor(kg, object, ray, &P, &dir, &idir, &t_fac);
|
|
# endif
|
|
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
/* scale isect->t to adjust for instancing */
|
|
for(int i = 0; i < num_hits_in_instance; i++)
|
|
(isect_array-i-1)->t *= t_fac;
|
|
}
|
|
else {
|
|
float ignore_t = FLT_MAX;
|
|
|
|
# if BVH_FEATURE(BVH_MOTION)
|
|
bvh_instance_motion_pop(kg, object, ray, &P, &dir, &idir, &ignore_t, &ob_itfm);
|
|
# else
|
|
bvh_instance_pop(kg, object, ray, &P, &dir, &idir, &ignore_t);
|
|
# endif
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
}
|
|
|
|
isect_t = tmax;
|
|
isect_array->t = isect_t;
|
|
|
|
# if defined(__KERNEL_SSE2__)
|
|
Psplat[0] = ssef(P.x);
|
|
Psplat[1] = ssef(P.y);
|
|
Psplat[2] = ssef(P.z);
|
|
|
|
tsplat = ssef(0.0f, 0.0f, -isect_t, -isect_t);
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
tfar = ssef(isect_t);
|
|
# endif
|
|
gen_idirsplat_swap(pn, shuf_identity, shuf_swap, idir, idirsplat, shufflexyz);
|
|
# endif
|
|
|
|
object = OBJECT_NONE;
|
|
nodeAddr = traversalStack[stackPtr];
|
|
--stackPtr;
|
|
}
|
|
#endif /* FEATURE(BVH_INSTANCING) */
|
|
} while(nodeAddr != ENTRYPOINT_SENTINEL);
|
|
|
|
return false;
|
|
}
|
|
|
|
ccl_device_inline bool BVH_FUNCTION_NAME(KernelGlobals *kg,
|
|
const Ray *ray,
|
|
Intersection *isect_array,
|
|
const uint max_hits,
|
|
uint *num_hits)
|
|
{
|
|
#ifdef __QBVH__
|
|
if(kernel_data.bvh.use_qbvh) {
|
|
return BVH_FUNCTION_FULL_NAME(QBVH)(kg,
|
|
ray,
|
|
isect_array,
|
|
max_hits,
|
|
num_hits);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
kernel_assert(kernel_data.bvh.use_qbvh == false);
|
|
return BVH_FUNCTION_FULL_NAME(BVH)(kg,
|
|
ray,
|
|
isect_array,
|
|
max_hits,
|
|
num_hits);
|
|
}
|
|
}
|
|
|
|
#undef BVH_FUNCTION_NAME
|
|
#undef BVH_FUNCTION_FEATURES
|
|
#undef NODE_INTERSECT
|