forked from bartvdbraak/blender
240 lines
6.5 KiB
C
240 lines
6.5 KiB
C
/*
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* Adapted from code Copyright 2009-2010 NVIDIA Corporation
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* Modifications Copyright 2011, Blender Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This is a template BVH traversal function, where various features can be
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* enabled/disabled. This way we can compile optimized versions for each case
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* without new features slowing things down.
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*
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* BVH_INSTANCING: object instancing
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* BVH_HAIR: hair curve rendering
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* BVH_HAIR_MINIMUM_WIDTH: hair curve rendering with minimum width
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* BVH_SUBSURFACE: subsurface same object, random triangle intersection
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* BVH_MOTION: motion blur rendering
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*
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*/
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#define FEATURE(f) (((BVH_FUNCTION_FEATURES) & (f)) != 0)
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__device bool BVH_FUNCTION_NAME
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(KernelGlobals *kg, const Ray *ray, Intersection *isect
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#if FEATURE(BVH_SUBSURFACE)
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, int subsurface_object, float subsurface_random
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#else
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, const uint visibility
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#endif
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#if FEATURE(BVH_HAIR_MINIMUM_WIDTH) && !FEATURE(BVH_SUBSURFACE)
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, uint *lcg_state = NULL, float difl = 0.0f, float extmax = 0.0f
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#endif
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)
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{
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/* traversal stack in CUDA thread-local memory */
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int traversalStack[BVH_STACK_SIZE];
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traversalStack[0] = ENTRYPOINT_SENTINEL;
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/* traversal variables in registers */
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int stackPtr = 0;
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int nodeAddr = kernel_data.bvh.root;
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/* ray parameters in registers */
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const float tmax = ray->t;
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float3 P = ray->P;
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float3 idir = bvh_inverse_direction(ray->D);
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int object = ~0;
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#if FEATURE(BVH_SUBSURFACE)
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const uint visibility = ~0;
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int num_hits = 0;
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#endif
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#if FEATURE(BVH_MOTION)
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Transform ob_tfm;
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#endif
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isect->t = tmax;
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isect->object = ~0;
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isect->prim = ~0;
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isect->u = 0.0f;
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isect->v = 0.0f;
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/* traversal loop */
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do {
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do
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{
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/* traverse internal nodes */
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while(nodeAddr >= 0 && nodeAddr != ENTRYPOINT_SENTINEL)
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{
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bool traverseChild0, traverseChild1, closestChild1;
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int nodeAddrChild1;
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#if FEATURE(BVH_HAIR_MINIMUM_WIDTH) && !FEATURE(BVH_SUBSURFACE)
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bvh_node_intersect(kg, &traverseChild0, &traverseChild1,
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&closestChild1, &nodeAddr, &nodeAddrChild1,
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P, idir, isect->t, visibility, nodeAddr, difl, extmax);
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#else
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bvh_node_intersect(kg, &traverseChild0, &traverseChild1,
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&closestChild1, &nodeAddr, &nodeAddrChild1,
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P, idir, isect->t, visibility, nodeAddr);
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#endif
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if(traverseChild0 != traverseChild1) {
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/* one child was intersected */
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if(traverseChild1) {
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nodeAddr = nodeAddrChild1;
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}
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}
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else {
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if(!traverseChild0) {
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/* neither child was intersected */
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nodeAddr = traversalStack[stackPtr];
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--stackPtr;
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}
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else {
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/* both children were intersected, push the farther one */
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if(closestChild1) {
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int tmp = nodeAddr;
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nodeAddr = nodeAddrChild1;
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nodeAddrChild1 = tmp;
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}
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++stackPtr;
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traversalStack[stackPtr] = nodeAddrChild1;
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}
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}
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}
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/* if node is leaf, fetch triangle list */
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if(nodeAddr < 0) {
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float4 leaf = kernel_tex_fetch(__bvh_nodes, (-nodeAddr-1)*BVH_NODE_SIZE+(BVH_NODE_SIZE-1));
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int primAddr = __float_as_int(leaf.x);
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#if FEATURE(BVH_INSTANCING)
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if(primAddr >= 0) {
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#endif
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int primAddr2 = __float_as_int(leaf.y);
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/* pop */
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nodeAddr = traversalStack[stackPtr];
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--stackPtr;
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/* primitive intersection */
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while(primAddr < primAddr2) {
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#if FEATURE(BVH_SUBSURFACE)
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/* only primitives from the same object */
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uint tri_object = (object == ~0)? kernel_tex_fetch(__prim_object, primAddr): object;
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if(tri_object == subsurface_object) {
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#endif
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/* intersect ray against primitive */
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#if FEATURE(BVH_HAIR)
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uint segment = kernel_tex_fetch(__prim_segment, primAddr);
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#if !FEATURE(BVH_SUBSURFACE)
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if(segment != ~0) {
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if(kernel_data.curve_kernel_data.curveflags & CURVE_KN_INTERPOLATE)
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#if FEATURE(BVH_HAIR_MINIMUM_WIDTH)
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bvh_cardinal_curve_intersect(kg, isect, P, idir, visibility, object, primAddr, segment, lcg_state, difl, extmax);
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else
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bvh_curve_intersect(kg, isect, P, idir, visibility, object, primAddr, segment, lcg_state, difl, extmax);
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#else
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bvh_cardinal_curve_intersect(kg, isect, P, idir, visibility, object, primAddr, segment);
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else
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bvh_curve_intersect(kg, isect, P, idir, visibility, object, primAddr, segment);
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#endif
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}
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else
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#endif
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#endif
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#if FEATURE(BVH_SUBSURFACE)
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#if FEATURE(BVH_HAIR)
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if(segment == ~0)
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#endif
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bvh_triangle_intersect_subsurface(kg, isect, P, idir, object, primAddr, tmax, &num_hits, subsurface_random);
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}
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#else
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bvh_triangle_intersect(kg, isect, P, idir, visibility, object, primAddr);
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/* shadow ray early termination */
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if(visibility == PATH_RAY_SHADOW_OPAQUE && isect->prim != ~0)
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return true;
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#endif
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primAddr++;
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}
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}
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#if FEATURE(BVH_INSTANCING)
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else {
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/* instance push */
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#if FEATURE(BVH_SUBSURFACE)
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if(subsurface_object == kernel_tex_fetch(__prim_object, -primAddr-1)) {
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object = subsurface_object;
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#else
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object = kernel_tex_fetch(__prim_object, -primAddr-1);
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#endif
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#if FEATURE(BVH_MOTION)
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bvh_instance_motion_push(kg, object, ray, &P, &idir, &isect->t, &ob_tfm, tmax);
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#else
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bvh_instance_push(kg, object, ray, &P, &idir, &isect->t, tmax);
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#endif
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++stackPtr;
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traversalStack[stackPtr] = ENTRYPOINT_SENTINEL;
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nodeAddr = kernel_tex_fetch(__object_node, object);
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#if FEATURE(BVH_SUBSURFACE)
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}
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else {
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/* pop */
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nodeAddr = traversalStack[stackPtr];
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--stackPtr;
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}
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#endif
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}
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}
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#endif
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} while(nodeAddr != ENTRYPOINT_SENTINEL);
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#if FEATURE(BVH_INSTANCING)
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if(stackPtr >= 0) {
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kernel_assert(object != ~0);
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/* instance pop */
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#if FEATURE(BVH_MOTION)
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bvh_instance_motion_pop(kg, object, ray, &P, &idir, &isect->t, &ob_tfm, tmax);
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#else
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bvh_instance_pop(kg, object, ray, &P, &idir, &isect->t, tmax);
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#endif
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object = ~0;
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nodeAddr = traversalStack[stackPtr];
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--stackPtr;
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}
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#endif
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} while(nodeAddr != ENTRYPOINT_SENTINEL);
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#if FEATURE(BVH_SUBSURFACE)
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return (num_hits != 0);
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#else
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return (isect->prim != ~0);
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#endif
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}
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#undef FEATURE
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#undef BVH_FUNCTION_NAME
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#undef BVH_FUNCTION_FEATURES
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