53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bli
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*/
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#include "BLI_index_range.hh"
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#include "BLI_utildefines.h"
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#include <ostream>
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namespace blender {
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AlignedIndexRanges split_index_range_by_alignment(const IndexRange range, const int64_t alignment)
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{
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BLI_assert(is_power_of_2(alignment));
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const int64_t mask = alignment - 1;
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AlignedIndexRanges aligned_ranges;
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const int64_t start_chunk = range.start() & ~mask;
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const int64_t end_chunk = range.one_after_last() & ~mask;
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if (start_chunk == end_chunk) {
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aligned_ranges.prefix = range;
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}
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else {
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int64_t prefix_size = 0;
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int64_t suffix_size = 0;
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if (range.start() != start_chunk) {
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prefix_size = alignment - (range.start() & mask);
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}
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if (range.one_after_last() != end_chunk) {
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suffix_size = range.one_after_last() - end_chunk;
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}
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aligned_ranges.prefix = IndexRange(range.start(), prefix_size);
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aligned_ranges.suffix = IndexRange(end_chunk, suffix_size);
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aligned_ranges.aligned = IndexRange(aligned_ranges.prefix.one_after_last(),
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range.size() - prefix_size - suffix_size);
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}
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return aligned_ranges;
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}
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std::ostream &operator<<(std::ostream &stream, IndexRange range)
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{
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stream << '[' << range.start() << ", " << range.one_after_last() << ')';
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return stream;
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}
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} // namespace blender
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