forked from bartvdbraak/blender
298d8681a0
This is the same issue T43475: SSE4 code is more robust to non-finite values in the ray origin/direction. So for now added a check before doing BVH traversal for pre-SSE4 CPUs. For sure actual root of the issue is a bit different and much more tricky to solve, especially without disturbing render results too much. Still looking into this. In any case, it's kinda fine to have such a check, we might later make it to be a kernel_assert() instead of just a return.
419 lines
13 KiB
C
419 lines
13 KiB
C
/*
|
|
* Adapted from code Copyright 2009-2010 NVIDIA Corporation,
|
|
* and code copyright 2009-2012 Intel Corporation
|
|
*
|
|
* Modifications Copyright 2011-2014, 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.
|
|
*/
|
|
|
|
/* 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_HAIR_MINIMUM_WIDTH: hair curve rendering with minimum width
|
|
* BVH_MOTION: motion blur rendering
|
|
*
|
|
*/
|
|
|
|
ccl_device bool BVH_FUNCTION_FULL_NAME(QBVH)(KernelGlobals *kg,
|
|
const Ray *ray,
|
|
Intersection *isect,
|
|
const uint visibility
|
|
#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH)
|
|
,uint *lcg_state,
|
|
float difl,
|
|
float extmax
|
|
#endif
|
|
)
|
|
{
|
|
/* TODO(sergey):
|
|
* - Test if pushing distance on the stack helps (for non shadow rays).
|
|
* - Separate version for shadow rays.
|
|
* - Likely and unlikely for if() statements.
|
|
* - Test restrict attribute for pointers.
|
|
*/
|
|
|
|
/* Traversal stack in CUDA thread-local memory. */
|
|
QBVHStackItem traversalStack[BVH_QSTACK_SIZE];
|
|
traversalStack[0].addr = ENTRYPOINT_SENTINEL;
|
|
traversalStack[0].dist = -FLT_MAX;
|
|
|
|
/* Traversal variables in registers. */
|
|
int stackPtr = 0;
|
|
int nodeAddr = kernel_data.bvh.root;
|
|
float nodeDist = -FLT_MAX;
|
|
|
|
/* Ray parameters in registers. */
|
|
float3 P = ray->P;
|
|
float3 dir = bvh_clamp_direction(ray->D);
|
|
float3 idir = bvh_inverse_direction(dir);
|
|
int object = OBJECT_NONE;
|
|
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
Transform ob_tfm;
|
|
#endif
|
|
|
|
#ifndef __KERNEL_SSE41__
|
|
if(!isfinite(P.x)) {
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
isect->t = ray->t;
|
|
isect->u = 0.0f;
|
|
isect->v = 0.0f;
|
|
isect->prim = PRIM_NONE;
|
|
isect->object = OBJECT_NONE;
|
|
|
|
#if defined(__KERNEL_DEBUG__)
|
|
isect->num_traversal_steps = 0;
|
|
#endif
|
|
|
|
ssef tnear(0.0f), tfar(ray->t);
|
|
sse3f idir4(ssef(idir.x), ssef(idir.y), ssef(idir.z));
|
|
|
|
#ifdef __KERNEL_AVX2__
|
|
float3 P_idir = P*idir;
|
|
sse3f P_idir4 = sse3f(P_idir.x, P_idir.y, P_idir.z);
|
|
#else
|
|
sse3f org = sse3f(ssef(P.x), ssef(P.y), ssef(P.z));
|
|
#endif
|
|
|
|
/* Offsets to select the side that becomes the lower or upper bound. */
|
|
int near_x, near_y, near_z;
|
|
int far_x, far_y, far_z;
|
|
|
|
if(idir.x >= 0.0f) { near_x = 0; far_x = 1; } else { near_x = 1; far_x = 0; }
|
|
if(idir.y >= 0.0f) { near_y = 2; far_y = 3; } else { near_y = 3; far_y = 2; }
|
|
if(idir.z >= 0.0f) { near_z = 4; far_z = 5; } else { near_z = 5; far_z = 4; }
|
|
|
|
IsectPrecalc isect_precalc;
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
/* Traversal loop. */
|
|
do {
|
|
do {
|
|
/* Traverse internal nodes. */
|
|
while(nodeAddr >= 0 && nodeAddr != ENTRYPOINT_SENTINEL) {
|
|
if(UNLIKELY(nodeDist > isect->t)) {
|
|
/* Pop. */
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
continue;
|
|
}
|
|
|
|
int traverseChild;
|
|
ssef dist;
|
|
|
|
#if defined(__KERNEL_DEBUG__)
|
|
isect->num_traversal_steps++;
|
|
#endif
|
|
|
|
#if BVH_FEATURE(BVH_HAIR_MINIMUM_WIDTH)
|
|
if(difl != 0.0f) {
|
|
/* NOTE: We extend all the child BB instead of fetching
|
|
* and checking visibility flags for each of the,
|
|
*
|
|
* Need to test if doing opposite would be any faster.
|
|
*/
|
|
traverseChild = qbvh_node_intersect_robust(kg,
|
|
tnear,
|
|
tfar,
|
|
#ifdef __KERNEL_AVX2__
|
|
P_idir4,
|
|
#else
|
|
org,
|
|
#endif
|
|
idir4,
|
|
near_x, near_y, near_z,
|
|
far_x, far_y, far_z,
|
|
nodeAddr,
|
|
difl,
|
|
&dist);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
traverseChild = qbvh_node_intersect(kg,
|
|
tnear,
|
|
tfar,
|
|
#ifdef __KERNEL_AVX2__
|
|
P_idir4,
|
|
#else
|
|
org,
|
|
#endif
|
|
idir4,
|
|
near_x, near_y, near_z,
|
|
far_x, far_y, far_z,
|
|
nodeAddr,
|
|
&dist);
|
|
}
|
|
|
|
if(traverseChild != 0) {
|
|
float4 cnodes = kernel_tex_fetch(__bvh_nodes, nodeAddr*BVH_QNODE_SIZE+6);
|
|
|
|
/* One child is hit, continue with that child. */
|
|
int r = __bscf(traverseChild);
|
|
float d0 = ((float*)&dist)[r];
|
|
if(traverseChild == 0) {
|
|
nodeAddr = __float_as_int(cnodes[r]);
|
|
nodeDist = d0;
|
|
continue;
|
|
}
|
|
|
|
/* Two children are hit, push far child, and continue with
|
|
* closer child.
|
|
*/
|
|
int c0 = __float_as_int(cnodes[r]);
|
|
r = __bscf(traverseChild);
|
|
int c1 = __float_as_int(cnodes[r]);
|
|
float d1 = ((float*)&dist)[r];
|
|
if(traverseChild == 0) {
|
|
if(d1 < d0) {
|
|
nodeAddr = c1;
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c0;
|
|
traversalStack[stackPtr].dist = d0;
|
|
continue;
|
|
}
|
|
else {
|
|
nodeAddr = c0;
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c1;
|
|
traversalStack[stackPtr].dist = d1;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Here starts the slow path for 3 or 4 hit children. We push
|
|
* all nodes onto the stack to sort them there.
|
|
*/
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c1;
|
|
traversalStack[stackPtr].dist = d1;
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c0;
|
|
traversalStack[stackPtr].dist = d0;
|
|
|
|
/* Three children are hit, push all onto stack and sort 3
|
|
* stack items, continue with closest child.
|
|
*/
|
|
r = __bscf(traverseChild);
|
|
int c2 = __float_as_int(cnodes[r]);
|
|
float d2 = ((float*)&dist)[r];
|
|
if(traverseChild == 0) {
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c2;
|
|
traversalStack[stackPtr].dist = d2;
|
|
qbvh_stack_sort(&traversalStack[stackPtr],
|
|
&traversalStack[stackPtr - 1],
|
|
&traversalStack[stackPtr - 2]);
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
continue;
|
|
}
|
|
|
|
/* Four children are hit, push all onto stack and sort 4
|
|
* stack items, continue with closest child.
|
|
*/
|
|
r = __bscf(traverseChild);
|
|
int c3 = __float_as_int(cnodes[r]);
|
|
float d3 = ((float*)&dist)[r];
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c3;
|
|
traversalStack[stackPtr].dist = d3;
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = c2;
|
|
traversalStack[stackPtr].dist = d2;
|
|
qbvh_stack_sort(&traversalStack[stackPtr],
|
|
&traversalStack[stackPtr - 1],
|
|
&traversalStack[stackPtr - 2],
|
|
&traversalStack[stackPtr - 3]);
|
|
}
|
|
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
}
|
|
|
|
/* If node is leaf, fetch triangle list. */
|
|
if(nodeAddr < 0) {
|
|
float4 leaf = kernel_tex_fetch(__bvh_nodes, (-nodeAddr-1)*BVH_QNODE_SIZE+6);
|
|
|
|
#ifdef __VISIBILITY_FLAG__
|
|
if(UNLIKELY((nodeDist > isect->t) || ((__float_as_uint(leaf.z) & visibility) == 0)))
|
|
#else
|
|
if(UNLIKELY((nodeDist > isect->t)))
|
|
#endif
|
|
{
|
|
/* Pop. */
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
continue;
|
|
}
|
|
|
|
int primAddr = __float_as_int(leaf.x);
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
if(primAddr >= 0) {
|
|
#endif
|
|
int primAddr2 = __float_as_int(leaf.y);
|
|
const uint type = __float_as_int(leaf.w);
|
|
|
|
/* Pop. */
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
|
|
/* Primitive intersection. */
|
|
switch(type & PRIMITIVE_ALL) {
|
|
case PRIMITIVE_TRIANGLE: {
|
|
for(; primAddr < primAddr2; primAddr++) {
|
|
#if defined(__KERNEL_DEBUG__)
|
|
isect->num_traversal_steps++;
|
|
#endif
|
|
kernel_assert(kernel_tex_fetch(__prim_type, primAddr) == type);
|
|
if(triangle_intersect(kg, &isect_precalc, isect, P, dir, visibility, object, primAddr)) {
|
|
tfar = ssef(isect->t);
|
|
/* Shadow ray early termination. */
|
|
if(visibility == PATH_RAY_SHADOW_OPAQUE)
|
|
return true;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
case PRIMITIVE_MOTION_TRIANGLE: {
|
|
for(; primAddr < primAddr2; primAddr++) {
|
|
#if defined(__KERNEL_DEBUG__)
|
|
isect->num_traversal_steps++;
|
|
#endif
|
|
kernel_assert(kernel_tex_fetch(__prim_type, primAddr) == type);
|
|
if(motion_triangle_intersect(kg, isect, P, dir, ray->time, visibility, object, primAddr)) {
|
|
tfar = ssef(isect->t);
|
|
/* Shadow ray early termination. */
|
|
if(visibility == PATH_RAY_SHADOW_OPAQUE)
|
|
return true;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
#endif /* BVH_FEATURE(BVH_MOTION) */
|
|
#if BVH_FEATURE(BVH_HAIR)
|
|
case PRIMITIVE_CURVE:
|
|
case PRIMITIVE_MOTION_CURVE: {
|
|
for(; primAddr < primAddr2; primAddr++) {
|
|
#if defined(__KERNEL_DEBUG__)
|
|
isect->num_traversal_steps++;
|
|
#endif
|
|
kernel_assert(kernel_tex_fetch(__prim_type, primAddr) == type);
|
|
bool hit;
|
|
if(kernel_data.curve.curveflags & CURVE_KN_INTERPOLATE)
|
|
hit = bvh_cardinal_curve_intersect(kg, isect, P, dir, visibility, object, primAddr, ray->time, type, lcg_state, difl, extmax);
|
|
else
|
|
hit = bvh_curve_intersect(kg, isect, P, dir, visibility, object, primAddr, ray->time, type, lcg_state, difl, extmax);
|
|
if(hit) {
|
|
tfar = ssef(isect->t);
|
|
/* Shadow ray early termination. */
|
|
if(visibility == PATH_RAY_SHADOW_OPAQUE)
|
|
return true;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
#endif /* BVH_FEATURE(BVH_HAIR) */
|
|
}
|
|
}
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
else {
|
|
/* Instance push. */
|
|
object = kernel_tex_fetch(__prim_object, -primAddr-1);
|
|
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
qbvh_instance_motion_push(kg, object, ray, &P, &dir, &idir, &isect->t, &nodeDist, &ob_tfm);
|
|
#else
|
|
qbvh_instance_push(kg, object, ray, &P, &dir, &idir, &isect->t, &nodeDist);
|
|
#endif
|
|
|
|
if(idir.x >= 0.0f) { near_x = 0; far_x = 1; } else { near_x = 1; far_x = 0; }
|
|
if(idir.y >= 0.0f) { near_y = 2; far_y = 3; } else { near_y = 3; far_y = 2; }
|
|
if(idir.z >= 0.0f) { near_z = 4; far_z = 5; } else { near_z = 5; far_z = 4; }
|
|
tfar = ssef(isect->t);
|
|
idir4 = sse3f(ssef(idir.x), ssef(idir.y), ssef(idir.z));
|
|
#ifdef __KERNEL_AVX2__
|
|
P_idir = P*idir;
|
|
P_idir4 = sse3f(P_idir.x, P_idir.y, P_idir.z);
|
|
#else
|
|
org = sse3f(ssef(P.x), ssef(P.y), ssef(P.z));
|
|
#endif
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
++stackPtr;
|
|
kernel_assert(stackPtr < BVH_QSTACK_SIZE);
|
|
traversalStack[stackPtr].addr = ENTRYPOINT_SENTINEL;
|
|
traversalStack[stackPtr].dist = -FLT_MAX;
|
|
|
|
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);
|
|
|
|
/* Instance pop. */
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
bvh_instance_motion_pop(kg, object, ray, &P, &dir, &idir, &isect->t, &ob_tfm);
|
|
#else
|
|
bvh_instance_pop(kg, object, ray, &P, &dir, &idir, &isect->t);
|
|
#endif
|
|
|
|
if(idir.x >= 0.0f) { near_x = 0; far_x = 1; } else { near_x = 1; far_x = 0; }
|
|
if(idir.y >= 0.0f) { near_y = 2; far_y = 3; } else { near_y = 3; far_y = 2; }
|
|
if(idir.z >= 0.0f) { near_z = 4; far_z = 5; } else { near_z = 5; far_z = 4; }
|
|
tfar = ssef(isect->t);
|
|
idir4 = sse3f(ssef(idir.x), ssef(idir.y), ssef(idir.z));
|
|
#ifdef __KERNEL_AVX2__
|
|
P_idir = P*idir;
|
|
P_idir4 = sse3f(P_idir.x, P_idir.y, P_idir.z);
|
|
#else
|
|
org = sse3f(ssef(P.x), ssef(P.y), ssef(P.z));
|
|
#endif
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
object = OBJECT_NONE;
|
|
nodeAddr = traversalStack[stackPtr].addr;
|
|
nodeDist = traversalStack[stackPtr].dist;
|
|
--stackPtr;
|
|
}
|
|
#endif /* FEATURE(BVH_INSTANCING) */
|
|
} while(nodeAddr != ENTRYPOINT_SENTINEL);
|
|
|
|
return (isect->prim != PRIM_NONE);
|
|
}
|