2014-12-16 15:11:37 +00:00
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/*
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* Adapted from code Copyright 2009-2010 NVIDIA Corporation,
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* and code copyright 2009-2012 Intel Corporation
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*
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* Modifications Copyright 2011-2014, 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 for volumes, where
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* various features can be enabled/disabled. This way we can compile optimized
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* versions for each case without new features slowing things down.
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*
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* BVH_INSTANCING: object instancing
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* BVH_MOTION: motion blur rendering
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*
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*/
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2016-07-07 10:23:13 +00:00
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#if BVH_FEATURE(BVH_HAIR)
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# define NODE_INTERSECT qbvh_node_intersect
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#else
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# define NODE_INTERSECT qbvh_aligned_node_intersect
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#endif
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2014-12-16 15:11:37 +00:00
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ccl_device bool BVH_FUNCTION_FULL_NAME(QBVH)(KernelGlobals *kg,
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const Ray *ray,
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2016-04-04 17:30:38 +00:00
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Intersection *isect,
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const uint visibility)
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2014-12-16 15:11:37 +00:00
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{
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/* TODO(sergey):
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* - Test if pushing distance on the stack helps.
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* - Likely and unlikely for if() statements.
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* - Test restrict attribute for pointers.
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*/
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/* Traversal stack in CUDA thread-local memory. */
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2016-07-11 11:44:19 +00:00
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QBVHStackItem traversal_stack[BVH_QSTACK_SIZE];
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traversal_stack[0].addr = ENTRYPOINT_SENTINEL;
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2014-12-16 15:11:37 +00:00
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/* Traversal variables in registers. */
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2016-07-11 11:44:19 +00:00
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int stack_ptr = 0;
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int node_addr = kernel_data.bvh.root;
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2014-12-16 15:11:37 +00:00
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/* Ray parameters in registers. */
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float3 P = ray->P;
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float3 dir = bvh_clamp_direction(ray->D);
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float3 idir = bvh_inverse_direction(dir);
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int object = OBJECT_NONE;
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#if BVH_FEATURE(BVH_MOTION)
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2015-10-08 16:24:54 +00:00
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Transform ob_itfm;
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2014-12-16 15:11:37 +00:00
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#endif
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2015-02-10 12:31:55 +00:00
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#ifndef __KERNEL_SSE41__
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if(!isfinite(P.x)) {
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return false;
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}
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#endif
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2014-12-16 15:11:37 +00:00
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isect->t = ray->t;
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isect->u = 0.0f;
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isect->v = 0.0f;
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isect->prim = PRIM_NONE;
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isect->object = OBJECT_NONE;
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ssef tnear(0.0f), tfar(ray->t);
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2016-07-07 10:23:13 +00:00
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#if BVH_FEATURE(BVH_HAIR)
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sse3f dir4(ssef(dir.x), ssef(dir.y), ssef(dir.z));
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#endif
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2014-12-16 15:11:37 +00:00
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sse3f idir4(ssef(idir.x), ssef(idir.y), ssef(idir.z));
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#ifdef __KERNEL_AVX2__
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float3 P_idir = P*idir;
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2016-07-07 10:23:13 +00:00
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sse3f P_idir4(P_idir.x, P_idir.y, P_idir.z);
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#endif
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#if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__)
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sse3f org4(ssef(P.x), ssef(P.y), ssef(P.z));
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2014-12-16 15:11:37 +00:00
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#endif
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/* Offsets to select the side that becomes the lower or upper bound. */
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int near_x, near_y, near_z;
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int far_x, far_y, far_z;
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if(idir.x >= 0.0f) { near_x = 0; far_x = 1; } else { near_x = 1; far_x = 0; }
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if(idir.y >= 0.0f) { near_y = 2; far_y = 3; } else { near_y = 3; far_y = 2; }
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if(idir.z >= 0.0f) { near_z = 4; far_z = 5; } else { near_z = 5; far_z = 4; }
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IsectPrecalc isect_precalc;
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triangle_intersect_precalc(dir, &isect_precalc);
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/* Traversal loop. */
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do {
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do {
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/* Traverse internal nodes. */
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2016-07-11 11:44:19 +00:00
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while(node_addr >= 0 && node_addr != ENTRYPOINT_SENTINEL) {
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2016-06-10 08:14:05 +00:00
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#ifdef __VISIBILITY_FLAG__
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2016-07-11 11:44:19 +00:00
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float4 inodes = kernel_tex_fetch(__bvh_nodes, node_addr+0);
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2016-06-10 08:14:05 +00:00
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if((__float_as_uint(inodes.x) & visibility) == 0) {
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/* Pop. */
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2016-07-11 11:44:19 +00:00
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node_addr = traversal_stack[stack_ptr].addr;
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--stack_ptr;
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2016-06-10 08:14:05 +00:00
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continue;
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}
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#endif
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2014-12-16 15:11:37 +00:00
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ssef dist;
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2016-07-11 11:44:19 +00:00
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int child_mask = NODE_INTERSECT(kg,
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tnear,
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tfar,
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2014-12-16 15:11:37 +00:00
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#ifdef __KERNEL_AVX2__
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2016-07-11 11:44:19 +00:00
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P_idir4,
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2016-07-07 10:23:13 +00:00
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#endif
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#if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__)
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2016-07-11 11:44:19 +00:00
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org4,
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2016-07-07 10:23:13 +00:00
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#endif
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#if BVH_FEATURE(BVH_HAIR)
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2016-07-11 11:44:19 +00:00
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dir4,
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2014-12-16 15:11:37 +00:00
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#endif
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2016-07-11 11:44:19 +00:00
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idir4,
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near_x, near_y, near_z,
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far_x, far_y, far_z,
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node_addr,
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&dist);
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2014-12-16 15:11:37 +00:00
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2016-07-11 11:44:19 +00:00
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if(child_mask != 0) {
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2016-07-07 10:23:13 +00:00
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float4 cnodes;
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#if BVH_FEATURE(BVH_HAIR)
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if(__float_as_uint(inodes.x) & PATH_RAY_NODE_UNALIGNED) {
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2016-07-11 11:44:19 +00:00
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cnodes = kernel_tex_fetch(__bvh_nodes, node_addr+13);
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2016-07-07 10:23:13 +00:00
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}
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else
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#endif
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{
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2016-07-11 11:44:19 +00:00
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cnodes = kernel_tex_fetch(__bvh_nodes, node_addr+7);
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2016-07-07 10:23:13 +00:00
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}
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2014-12-16 15:11:37 +00:00
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/* One child is hit, continue with that child. */
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2016-07-11 11:44:19 +00:00
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int r = __bscf(child_mask);
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if(child_mask == 0) {
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node_addr = __float_as_int(cnodes[r]);
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2014-12-16 15:11:37 +00:00
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continue;
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}
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/* Two children are hit, push far child, and continue with
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* closer child.
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*/
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int c0 = __float_as_int(cnodes[r]);
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float d0 = ((float*)&dist)[r];
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2016-07-11 11:44:19 +00:00
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r = __bscf(child_mask);
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2014-12-16 15:11:37 +00:00
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int c1 = __float_as_int(cnodes[r]);
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float d1 = ((float*)&dist)[r];
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2016-07-11 11:44:19 +00:00
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if(child_mask == 0) {
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2014-12-16 15:11:37 +00:00
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if(d1 < d0) {
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2016-07-11 11:44:19 +00:00
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node_addr = c1;
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c0;
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traversal_stack[stack_ptr].dist = d0;
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2014-12-16 15:11:37 +00:00
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continue;
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}
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else {
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2016-07-11 11:44:19 +00:00
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node_addr = c0;
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c1;
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traversal_stack[stack_ptr].dist = d1;
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2014-12-16 15:11:37 +00:00
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continue;
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}
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}
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/* Here starts the slow path for 3 or 4 hit children. We push
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* all nodes onto the stack to sort them there.
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*/
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2016-07-11 11:44:19 +00:00
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c1;
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traversal_stack[stack_ptr].dist = d1;
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c0;
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traversal_stack[stack_ptr].dist = d0;
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2014-12-16 15:11:37 +00:00
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/* Three children are hit, push all onto stack and sort 3
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* stack items, continue with closest child.
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*/
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2016-07-11 11:44:19 +00:00
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r = __bscf(child_mask);
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2014-12-16 15:11:37 +00:00
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int c2 = __float_as_int(cnodes[r]);
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float d2 = ((float*)&dist)[r];
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2016-07-11 11:44:19 +00:00
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if(child_mask == 0) {
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c2;
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traversal_stack[stack_ptr].dist = d2;
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qbvh_stack_sort(&traversal_stack[stack_ptr],
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&traversal_stack[stack_ptr - 1],
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&traversal_stack[stack_ptr - 2]);
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node_addr = traversal_stack[stack_ptr].addr;
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--stack_ptr;
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2014-12-16 15:11:37 +00:00
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continue;
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}
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/* Four children are hit, push all onto stack and sort 4
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* stack items, continue with closest child.
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*/
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2016-07-11 11:44:19 +00:00
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r = __bscf(child_mask);
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2014-12-16 15:11:37 +00:00
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int c3 = __float_as_int(cnodes[r]);
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float d3 = ((float*)&dist)[r];
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2016-07-11 11:44:19 +00:00
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c3;
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traversal_stack[stack_ptr].dist = d3;
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++stack_ptr;
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kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
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traversal_stack[stack_ptr].addr = c2;
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traversal_stack[stack_ptr].dist = d2;
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qbvh_stack_sort(&traversal_stack[stack_ptr],
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&traversal_stack[stack_ptr - 1],
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&traversal_stack[stack_ptr - 2],
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&traversal_stack[stack_ptr - 3]);
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2014-12-16 15:11:37 +00:00
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}
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2016-07-11 11:44:19 +00:00
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node_addr = traversal_stack[stack_ptr].addr;
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--stack_ptr;
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2014-12-16 15:11:37 +00:00
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}
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/* If node is leaf, fetch triangle list. */
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2016-07-11 11:44:19 +00:00
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if(node_addr < 0) {
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float4 leaf = kernel_tex_fetch(__bvh_leaf_nodes, (-node_addr-1));
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2016-08-25 09:13:35 +00:00
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if((__float_as_uint(leaf.z) & visibility) == 0) {
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/* Pop. */
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node_addr = traversal_stack[stack_ptr].addr;
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--stack_ptr;
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continue;
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}
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2016-07-11 11:44:19 +00:00
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int prim_addr = __float_as_int(leaf.x);
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2014-12-16 15:11:37 +00:00
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#if BVH_FEATURE(BVH_INSTANCING)
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2016-07-11 11:44:19 +00:00
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if(prim_addr >= 0) {
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2014-12-16 15:11:37 +00:00
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#endif
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2016-07-11 11:44:19 +00:00
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int prim_addr2 = __float_as_int(leaf.y);
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2015-01-10 17:41:49 +00:00
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const uint type = __float_as_int(leaf.w);
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const uint p_type = type & PRIMITIVE_ALL;
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2014-12-16 15:11:37 +00:00
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/* Pop. */
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2016-07-11 11:44:19 +00:00
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node_addr = traversal_stack[stack_ptr].addr;
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--stack_ptr;
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2014-12-16 15:11:37 +00:00
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/* Primitive intersection. */
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2015-01-10 17:41:49 +00:00
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switch(p_type) {
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case PRIMITIVE_TRIANGLE: {
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2016-07-11 11:44:19 +00:00
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for(; prim_addr < prim_addr2; prim_addr++) {
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kernel_assert(kernel_tex_fetch(__prim_type, prim_addr) == type);
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2015-01-10 17:41:49 +00:00
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/* Only primitives from volume object. */
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2016-07-11 11:44:19 +00:00
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uint tri_object = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, prim_addr): object;
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2015-01-10 17:41:49 +00:00
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int object_flag = kernel_tex_fetch(__object_flag, tri_object);
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if((object_flag & SD_OBJECT_HAS_VOLUME) == 0) {
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continue;
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}
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/* Intersect ray against primitive. */
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2016-07-11 11:44:19 +00:00
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triangle_intersect(kg, &isect_precalc, isect, P, visibility, object, prim_addr);
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2014-12-16 15:11:37 +00:00
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}
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2015-01-10 17:41:49 +00:00
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break;
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}
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2014-12-16 15:11:37 +00:00
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#if BVH_FEATURE(BVH_MOTION)
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2015-01-10 17:41:49 +00:00
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case PRIMITIVE_MOTION_TRIANGLE: {
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2016-07-11 11:44:19 +00:00
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for(; prim_addr < prim_addr2; prim_addr++) {
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kernel_assert(kernel_tex_fetch(__prim_type, prim_addr) == type);
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2015-01-10 17:41:49 +00:00
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/* Only primitives from volume object. */
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2016-07-11 11:44:19 +00:00
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uint tri_object = (object == OBJECT_NONE)? kernel_tex_fetch(__prim_object, prim_addr): object;
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2015-01-10 17:41:49 +00:00
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int object_flag = kernel_tex_fetch(__object_flag, tri_object);
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if((object_flag & SD_OBJECT_HAS_VOLUME) == 0) {
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continue;
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}
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/* Intersect ray against primitive. */
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2016-07-11 11:44:19 +00:00
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motion_triangle_intersect(kg, isect, P, dir, ray->time, visibility, object, prim_addr);
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2014-12-16 15:11:37 +00:00
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}
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2015-01-10 17:41:49 +00:00
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break;
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}
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|
|
|
#endif
|
2014-12-16 15:11:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
|
|
|
else {
|
|
|
|
/* Instance push. */
|
2016-07-11 11:44:19 +00:00
|
|
|
object = kernel_tex_fetch(__prim_object, -prim_addr-1);
|
2014-12-16 15:11:37 +00:00
|
|
|
int object_flag = kernel_tex_fetch(__object_flag, object);
|
|
|
|
|
|
|
|
if(object_flag & SD_OBJECT_HAS_VOLUME) {
|
|
|
|
|
2016-02-12 17:33:43 +00:00
|
|
|
# if BVH_FEATURE(BVH_MOTION)
|
2015-10-08 16:24:54 +00:00
|
|
|
bvh_instance_motion_push(kg, object, ray, &P, &dir, &idir, &isect->t, &ob_itfm);
|
2016-02-12 17:33:43 +00:00
|
|
|
# else
|
2014-12-16 15:11:37 +00:00
|
|
|
bvh_instance_push(kg, object, ray, &P, &dir, &idir, &isect->t);
|
2016-02-12 17:33:43 +00:00
|
|
|
# endif
|
2014-12-16 15:11:37 +00:00
|
|
|
|
|
|
|
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);
|
2016-07-07 10:23:13 +00:00
|
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
|
|
dir4 = sse3f(ssef(dir.x), ssef(dir.y), ssef(dir.z));
|
|
|
|
# endif
|
2014-12-16 15:11:37 +00:00
|
|
|
idir4 = sse3f(ssef(idir.x), ssef(idir.y), ssef(idir.z));
|
2016-02-12 17:33:43 +00:00
|
|
|
# ifdef __KERNEL_AVX2__
|
2014-12-16 15:11:37 +00:00
|
|
|
P_idir = P*idir;
|
|
|
|
P_idir4 = sse3f(P_idir.x, P_idir.y, P_idir.z);
|
2016-02-12 17:33:43 +00:00
|
|
|
# endif
|
2016-07-07 10:23:13 +00:00
|
|
|
# if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__)
|
|
|
|
org4 = sse3f(ssef(P.x), ssef(P.y), ssef(P.z));
|
|
|
|
# endif
|
|
|
|
|
2014-12-16 15:11:37 +00:00
|
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
|
2016-07-11 11:44:19 +00:00
|
|
|
++stack_ptr;
|
|
|
|
kernel_assert(stack_ptr < BVH_QSTACK_SIZE);
|
|
|
|
traversal_stack[stack_ptr].addr = ENTRYPOINT_SENTINEL;
|
2014-12-16 15:11:37 +00:00
|
|
|
|
2016-07-11 11:44:19 +00:00
|
|
|
node_addr = kernel_tex_fetch(__object_node, object);
|
2014-12-16 15:11:37 +00:00
|
|
|
}
|
|
|
|
else {
|
|
|
|
/* Pop. */
|
|
|
|
object = OBJECT_NONE;
|
2016-07-11 11:44:19 +00:00
|
|
|
node_addr = traversal_stack[stack_ptr].addr;
|
|
|
|
--stack_ptr;
|
2014-12-16 15:11:37 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* FEATURE(BVH_INSTANCING) */
|
2016-07-11 11:44:19 +00:00
|
|
|
} while(node_addr != ENTRYPOINT_SENTINEL);
|
2014-12-16 15:11:37 +00:00
|
|
|
|
|
|
|
#if BVH_FEATURE(BVH_INSTANCING)
|
2016-07-11 11:44:19 +00:00
|
|
|
if(stack_ptr >= 0) {
|
2014-12-16 15:11:37 +00:00
|
|
|
kernel_assert(object != OBJECT_NONE);
|
|
|
|
|
|
|
|
/* Instance pop. */
|
2016-02-12 17:33:43 +00:00
|
|
|
# if BVH_FEATURE(BVH_MOTION)
|
2015-10-08 16:24:54 +00:00
|
|
|
bvh_instance_motion_pop(kg, object, ray, &P, &dir, &idir, &isect->t, &ob_itfm);
|
2016-02-12 17:33:43 +00:00
|
|
|
# else
|
2014-12-16 15:11:37 +00:00
|
|
|
bvh_instance_pop(kg, object, ray, &P, &dir, &idir, &isect->t);
|
2016-02-12 17:33:43 +00:00
|
|
|
# endif
|
2014-12-16 15:11:37 +00:00
|
|
|
|
|
|
|
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);
|
2016-07-07 10:23:13 +00:00
|
|
|
# if BVH_FEATURE(BVH_HAIR)
|
|
|
|
dir4 = sse3f(ssef(dir.x), ssef(dir.y), ssef(dir.z));
|
|
|
|
# endif
|
2014-12-16 15:11:37 +00:00
|
|
|
idir4 = sse3f(ssef(idir.x), ssef(idir.y), ssef(idir.z));
|
2016-02-12 17:33:43 +00:00
|
|
|
# ifdef __KERNEL_AVX2__
|
2014-12-16 15:11:37 +00:00
|
|
|
P_idir = P*idir;
|
|
|
|
P_idir4 = sse3f(P_idir.x, P_idir.y, P_idir.z);
|
2016-02-12 17:33:43 +00:00
|
|
|
# endif
|
2016-07-07 10:23:13 +00:00
|
|
|
# if BVH_FEATURE(BVH_HAIR) || !defined(__KERNEL_AVX2__)
|
|
|
|
org4 = sse3f(ssef(P.x), ssef(P.y), ssef(P.z));
|
|
|
|
# endif
|
|
|
|
|
2014-12-16 15:11:37 +00:00
|
|
|
triangle_intersect_precalc(dir, &isect_precalc);
|
|
|
|
|
|
|
|
object = OBJECT_NONE;
|
2016-07-11 11:44:19 +00:00
|
|
|
node_addr = traversal_stack[stack_ptr].addr;
|
|
|
|
--stack_ptr;
|
2014-12-16 15:11:37 +00:00
|
|
|
}
|
|
|
|
#endif /* FEATURE(BVH_INSTANCING) */
|
2016-07-11 11:44:19 +00:00
|
|
|
} while(node_addr != ENTRYPOINT_SENTINEL);
|
2014-12-16 15:11:37 +00:00
|
|
|
|
|
|
|
return (isect->prim != PRIM_NONE);
|
|
|
|
}
|
2016-07-07 10:23:13 +00:00
|
|
|
|
|
|
|
#undef NODE_INTERSECT
|