91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "BLI_utildefines.h"
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namespace blender::sim {
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/**
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* The start time is exclusive and the end time is inclusive. If the duration is zero, the interval
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* describes a single point in time.
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*/
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class TimeInterval {
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private:
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float start_;
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float duration_;
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public:
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TimeInterval(float start, float duration) : start_(start), duration_(duration)
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{
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BLI_assert(duration_ >= 0.0f);
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}
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float start() const
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{
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return start_;
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}
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float stop() const
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{
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return start_ + duration_;
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}
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float duration() const
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{
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return duration_;
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}
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float time_at_factor(float factor) const
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{
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return start_ + factor * duration_;
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}
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float factor_at_time(float time) const
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{
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BLI_assert(duration_ > 0.0f);
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return (time - start_) / duration_;
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}
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float safe_factor_at_time(float time) const
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{
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if (duration_ > 0.0f) {
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return this->factor_at_time(time);
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}
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return 0.0f;
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}
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void compute_uniform_samples(MutableSpan<float> r_samples) const
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{
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int64_t amount = r_samples.size();
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if (amount == 0) {
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return;
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}
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if (amount == 1) {
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r_samples[0] = this->time_at_factor(0.5f);
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return;
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}
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const float step = duration_ / (float)(amount - 1);
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for (int64_t i : r_samples.index_range()) {
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r_samples[i] = start_ + i * step;
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}
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}
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};
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} // namespace blender::sim
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