bf65b64708
The code which was checking whether local intersection is to be recorded, and under which index was duplicated for triangles, motion triangles, and HIP-RT triangle filter function. This change moves the common logic to an utility function which is reused from all the places mentioned above. Pull Request: https://projects.blender.org/blender/blender/pulls/136244
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* SPDX-FileCopyrightText: 2025 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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/* Common utilities for various geometry type intersections. */
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#pragma once
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#include "kernel/globals.h"
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#include "kernel/sample/lcg.h"
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CCL_NAMESPACE_BEGIN
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/* For an intersection with the given distance isect_t from the ray origin increase the number
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* of hits (when needed) and return an index within local_isect->hits where intersection is to
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* be stored. If the return value -1 then the intersection is to be ignored (nothing is to be
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* written to the local_isect->hits and intersection test function is to return false. */
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#ifdef __BVH_LOCAL__
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ccl_device_forceinline int local_intersect_get_record_index(
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ccl_private LocalIntersection *local_isect,
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const float isect_t,
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ccl_private uint *lcg_state,
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const int max_hits)
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{
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if (lcg_state) {
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/* Record up to max_hits intersections. */
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for (int i = min(max_hits, local_isect->num_hits) - 1; i >= 0; --i) {
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if (local_isect->hits[i].t == isect_t) {
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return -1;
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}
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}
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local_isect->num_hits++;
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int hit;
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if (local_isect->num_hits <= max_hits) {
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hit = local_isect->num_hits - 1;
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}
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else {
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/* Reservoir sampling: if we are at the maximum number of hits, randomly replace element or
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* skip it. */
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hit = lcg_step_uint(lcg_state) % local_isect->num_hits;
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if (hit >= max_hits) {
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return -1;
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}
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}
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return hit;
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}
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/* Record closest intersection only. */
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if (local_isect->num_hits && isect_t > local_isect->hits[0].t) {
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return -1;
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}
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local_isect->num_hits = 1;
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return 0;
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}
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#endif /* __BVH_LOCAL__ */
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CCL_NAMESPACE_END
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