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90 lines
3 KiB
C++
90 lines
3 KiB
C++
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// Copyright 2013 Emilie Gillet.
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//
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// Author: Emilie Gillet (emilie.o.gillet@gmail.com)
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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
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// THE SOFTWARE.
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//
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// See http://creativecommons.org/licenses/MIT/ for more information.
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//
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// -----------------------------------------------------------------------------
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//
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// Multistage envelope.
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#include "pure_adsr/tides.h"
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#include "pure_adsr/resources.h"
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namespace pure_adsr {
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void Tides::Init()
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{
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set_adsr(0, 8192, 16384, 32767);
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segment_ = num_segments_;
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phase_ = 0;
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phase_increment_ = 0;
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start_value_ = 0;
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value_ = 0;
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hard_reset_ = false;
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quant.Init();
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}
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void Tides::Process(
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const GateFlags* gate_flags, int16_t* out, size_t size)
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{
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while (size--) {
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GateFlags gate_flag = *gate_flags++;
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if (gate_flag & GATE_FLAG_RISING) {
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start_value_ = (segment_ == num_segments_ || hard_reset_)
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? level_[0]
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: value_;
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segment_ = 0;
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phase_ = 0;
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} else if (gate_flag & GATE_FLAG_FALLING && sustain_point_) {
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start_value_ = value_;
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segment_ = sustain_point_;
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phase_ = 0;
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} else if (phase_ < phase_increment_) {
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start_value_ = level_[segment_ + 1];
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++segment_;
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phase_ = 0;
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if (segment_ == loop_end_) {
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segment_ = loop_start_;
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}
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}
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bool done = segment_ == num_segments_;
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bool sustained = sustain_point_ && segment_ == sustain_point_ && gate_flag & GATE_FLAG_HIGH;
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phase_increment_ = sustained || done ? 0 : pgm_read_dword(lut_res_env_increments_slow + (time_[segment_] >> 8));
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int32_t a = start_value_;
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int32_t b = level_[segment_ + 1];
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uint32_t x = pgm_read_word(lookup_table_table[LUT_RES_ENV_LINEAR + shape_[segment_]] + (phase_ >> 24));
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uint32_t y = pgm_read_word(lookup_table_table[LUT_RES_ENV_LINEAR + shape_[segment_]] + (phase_ >> 24) + 1);
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uint16_t t = x + ((y - x) * static_cast<uint32_t>((phase_ >> 8) & 0xffff) >> 16);
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value_ = a + ((b - a) * (t >> 1) >> 15);
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phase_ += phase_increment_;
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*out++ = value_;
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}
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}
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} // namespace peaks
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