237 lines
8.0 KiB
C
237 lines
8.0 KiB
C
/* SPDX-FileCopyrightText: 2009-2010 NVIDIA Corporation
|
|
* SPDX-FileCopyrightText: 2009-2012 Intel Corporation
|
|
* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Adapted code from NVIDIA Corporation. */
|
|
|
|
#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 for volumes, where
|
|
* various features can be enabled/disabled. This way we can compile optimized
|
|
* versions for each case without new features slowing things down.
|
|
*
|
|
* BVH_MOTION: motion blur rendering
|
|
*/
|
|
|
|
#ifndef __KERNEL_GPU__
|
|
ccl_device
|
|
#else
|
|
ccl_device_inline
|
|
#endif
|
|
bool BVH_FUNCTION_FULL_NAME(BVH)(KernelGlobals kg,
|
|
ccl_private const Ray *ray,
|
|
ccl_private Intersection *isect,
|
|
const uint visibility)
|
|
{
|
|
/* todo:
|
|
* - 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 */
|
|
int traversal_stack[BVH_STACK_SIZE];
|
|
traversal_stack[0] = ENTRYPOINT_SENTINEL;
|
|
|
|
/* traversal variables in registers */
|
|
int stack_ptr = 0;
|
|
int node_addr = kernel_data.bvh.root;
|
|
|
|
/* ray parameters in registers */
|
|
float3 P = ray->P;
|
|
float3 dir = bvh_clamp_direction(ray->D);
|
|
float3 idir = bvh_inverse_direction(dir);
|
|
const float tmin = ray->tmin;
|
|
int object = OBJECT_NONE;
|
|
|
|
isect->t = ray->tmax;
|
|
isect->u = 0.0f;
|
|
isect->v = 0.0f;
|
|
isect->prim = PRIM_NONE;
|
|
isect->object = OBJECT_NONE;
|
|
|
|
/* traversal loop */
|
|
do {
|
|
do {
|
|
/* traverse internal nodes */
|
|
while (node_addr >= 0 && node_addr != ENTRYPOINT_SENTINEL) {
|
|
int node_addr_child1, traverse_mask;
|
|
float dist[2];
|
|
float4 cnodes = kernel_data_fetch(bvh_nodes, node_addr + 0);
|
|
|
|
traverse_mask = NODE_INTERSECT(kg,
|
|
P,
|
|
#if BVH_FEATURE(BVH_HAIR)
|
|
dir,
|
|
#endif
|
|
idir,
|
|
tmin,
|
|
isect->t,
|
|
node_addr,
|
|
visibility,
|
|
dist);
|
|
|
|
node_addr = __float_as_int(cnodes.z);
|
|
node_addr_child1 = __float_as_int(cnodes.w);
|
|
|
|
if (traverse_mask == 3) {
|
|
/* Both children were intersected, push the farther one. */
|
|
bool is_closest_child1 = (dist[1] < dist[0]);
|
|
if (is_closest_child1) {
|
|
int tmp = node_addr;
|
|
node_addr = node_addr_child1;
|
|
node_addr_child1 = tmp;
|
|
}
|
|
|
|
++stack_ptr;
|
|
kernel_assert(stack_ptr < BVH_STACK_SIZE);
|
|
traversal_stack[stack_ptr] = node_addr_child1;
|
|
}
|
|
else {
|
|
/* One child was intersected. */
|
|
if (traverse_mask == 2) {
|
|
node_addr = node_addr_child1;
|
|
}
|
|
else if (traverse_mask == 0) {
|
|
/* Neither child was intersected. */
|
|
node_addr = traversal_stack[stack_ptr];
|
|
--stack_ptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if node is leaf, fetch triangle list */
|
|
if (node_addr < 0) {
|
|
float4 leaf = kernel_data_fetch(bvh_leaf_nodes, (-node_addr - 1));
|
|
int prim_addr = __float_as_int(leaf.x);
|
|
|
|
if (prim_addr >= 0) {
|
|
const int prim_addr2 = __float_as_int(leaf.y);
|
|
const uint type = __float_as_int(leaf.w);
|
|
|
|
/* pop */
|
|
node_addr = traversal_stack[stack_ptr];
|
|
--stack_ptr;
|
|
|
|
/* primitive intersection */
|
|
switch (type & PRIMITIVE_ALL) {
|
|
case PRIMITIVE_TRIANGLE: {
|
|
/* intersect ray against primitive */
|
|
for (; prim_addr < prim_addr2; prim_addr++) {
|
|
kernel_assert(kernel_data_fetch(prim_type, prim_addr) == type);
|
|
/* only primitives from volume object */
|
|
const int prim_object = (object == OBJECT_NONE) ?
|
|
kernel_data_fetch(prim_object, prim_addr) :
|
|
object;
|
|
const int prim = kernel_data_fetch(prim_index, prim_addr);
|
|
if (intersection_skip_self(ray->self, prim_object, prim)) {
|
|
continue;
|
|
}
|
|
|
|
int object_flag = kernel_data_fetch(object_flag, prim_object);
|
|
if ((object_flag & SD_OBJECT_HAS_VOLUME) == 0) {
|
|
continue;
|
|
}
|
|
triangle_intersect(
|
|
kg, isect, P, dir, tmin, isect->t, visibility, prim_object, prim, prim_addr);
|
|
}
|
|
break;
|
|
}
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
case PRIMITIVE_MOTION_TRIANGLE: {
|
|
/* intersect ray against primitive */
|
|
for (; prim_addr < prim_addr2; prim_addr++) {
|
|
kernel_assert(kernel_data_fetch(prim_type, prim_addr) == type);
|
|
/* only primitives from volume object */
|
|
const int prim_object = (object == OBJECT_NONE) ?
|
|
kernel_data_fetch(prim_object, prim_addr) :
|
|
object;
|
|
const int prim = kernel_data_fetch(prim_index, prim_addr);
|
|
if (intersection_skip_self(ray->self, prim_object, prim)) {
|
|
continue;
|
|
}
|
|
int object_flag = kernel_data_fetch(object_flag, prim_object);
|
|
if ((object_flag & SD_OBJECT_HAS_VOLUME) == 0) {
|
|
continue;
|
|
}
|
|
motion_triangle_intersect(kg,
|
|
isect,
|
|
P,
|
|
dir,
|
|
tmin,
|
|
isect->t,
|
|
ray->time,
|
|
visibility,
|
|
prim_object,
|
|
prim,
|
|
prim_addr);
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
default: {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* instance push */
|
|
object = kernel_data_fetch(prim_object, -prim_addr - 1);
|
|
int object_flag = kernel_data_fetch(object_flag, object);
|
|
if (object_flag & SD_OBJECT_HAS_VOLUME) {
|
|
#if BVH_FEATURE(BVH_MOTION)
|
|
bvh_instance_motion_push(kg, object, ray, &P, &dir, &idir);
|
|
#else
|
|
bvh_instance_push(kg, object, ray, &P, &dir, &idir);
|
|
#endif
|
|
|
|
++stack_ptr;
|
|
kernel_assert(stack_ptr < BVH_STACK_SIZE);
|
|
traversal_stack[stack_ptr] = ENTRYPOINT_SENTINEL;
|
|
|
|
node_addr = kernel_data_fetch(object_node, object);
|
|
}
|
|
else {
|
|
/* pop */
|
|
object = OBJECT_NONE;
|
|
node_addr = traversal_stack[stack_ptr];
|
|
--stack_ptr;
|
|
}
|
|
}
|
|
}
|
|
} while (node_addr != ENTRYPOINT_SENTINEL);
|
|
|
|
if (stack_ptr >= 0) {
|
|
kernel_assert(object != OBJECT_NONE);
|
|
|
|
/* instance pop */
|
|
bvh_instance_pop(ray, &P, &dir, &idir);
|
|
|
|
object = OBJECT_NONE;
|
|
node_addr = traversal_stack[stack_ptr];
|
|
--stack_ptr;
|
|
}
|
|
} while (node_addr != ENTRYPOINT_SENTINEL);
|
|
|
|
return (isect->prim != PRIM_NONE);
|
|
}
|
|
|
|
ccl_device_inline bool BVH_FUNCTION_NAME(KernelGlobals kg,
|
|
ccl_private const Ray *ray,
|
|
ccl_private Intersection *isect,
|
|
const uint visibility)
|
|
{
|
|
return BVH_FUNCTION_FULL_NAME(BVH)(kg, ray, isect, visibility);
|
|
}
|
|
|
|
#undef BVH_FUNCTION_NAME
|
|
#undef BVH_FUNCTION_FEATURES
|
|
#undef NODE_INTERSECT
|