90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*
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* simple_seq.h
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* Copyright (c) 2025 Christopher Herb
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#pragma once
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#include <cstddef>
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#include <cstdlib>
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#include <vector>
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using namespace std;
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namespace trnr {
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enum playback_dir {
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PB_FORWARD,
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PB_BACKWARD,
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PB_PENDULUM,
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PB_RANDOM
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};
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struct simple_seq {
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size_t current_pos;
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size_t length;
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playback_dir playback_dir;
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vector<int> data;
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bool pendulum_forward;
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};
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inline void simple_seq_init(simple_seq& s, size_t length)
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{
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s.current_pos = 0;
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s.length = length;
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s.playback_dir = PB_FORWARD;
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s.data.resize(s.length);
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s.data.assign(s.length, 0);
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s.pendulum_forward = true;
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}
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inline int simple_seq_process_step(simple_seq& s)
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{
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// play head advancement
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if (s.playback_dir == PB_FORWARD ||
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s.playback_dir == PB_PENDULUM && s.pendulum_forward)
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s.current_pos++;
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else if (s.playback_dir == PB_BACKWARD ||
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s.playback_dir == PB_PENDULUM && !s.pendulum_forward)
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s.current_pos--;
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else if (s.playback_dir == PB_RANDOM) s.current_pos = rand() % s.length;
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// play head reset
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switch (s.playback_dir) {
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case PB_FORWARD:
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if (s.current_pos > s.length - 1) s.current_pos = 0;
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break;
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case PB_BACKWARD:
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if (s.current_pos < 0) s.current_pos = s.length - 1;
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break;
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case PB_PENDULUM:
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if (s.pendulum_forward && s.current_pos >= s.length - 1)
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s.pendulum_forward = false;
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else if (!s.pendulum_forward && s.current_pos <= 0) s.pendulum_forward = true;
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break;
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case PB_RANDOM:
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break;
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}
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return s.data[s.current_pos];
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}
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} // namespace trnr
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