03f28553ff
This commit implements traversal for QBVH tree, which is based on the old loop code for traversal itself and Embree for node intersection. This commit also does some changes to the loop inspired by Embree: - Visibility flags are only checked for primitives. Doing visibility check for every node cost quite reasonable amount of time and in most cases those checks are true-positive. Other idea here would be to do visibility checks for leaf nodes only, but this would need to be investigated further. - For minimum hair width we extend all the nodes' bounding boxes. Again doing curve visibility check is quite costly for each of the nodes and those checks returns truth for most of the hierarchy anyway. There are number of possible optimization still, but current state is good enough in terms it makes rendering faster a little bit after recent watertight commit. Currently QBVH is only implemented for CPU with SSE2 support at least. All other devices would need to be supported later (if that'd make sense from performance point of view). The code is enabled for compilation in kernel. but blender wouldn't use it still.
47 lines
1.5 KiB
C
47 lines
1.5 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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/* bottom-most stack entry, indicating the end of traversal */
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#define ENTRYPOINT_SENTINEL 0x76543210
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/* 64 object BVH + 64 mesh BVH + 64 object node splitting */
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#define BVH_STACK_SIZE 192
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#define BVH_NODE_SIZE 4
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#define BVH_QNODE_SIZE 7
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#define TRI_NODE_SIZE 3
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/* silly workaround for float extended precision that happens when compiling
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* without sse support on x86, it results in different results for float ops
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* that you would otherwise expect to compare correctly */
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#if !defined(__i386__) || defined(__SSE__)
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#define NO_EXTENDED_PRECISION
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#else
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#define NO_EXTENDED_PRECISION volatile
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#endif
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#include "geom_attribute.h"
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#include "geom_object.h"
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#include "geom_triangle.h"
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#include "geom_triangle_intersect.h"
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#include "geom_motion_triangle.h"
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#include "geom_motion_curve.h"
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#include "geom_curve.h"
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#include "geom_volume.h"
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#include "geom_primitive.h"
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#include "geom_bvh.h"
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