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/**
bespoke synth, a software modular synthesizer
Copyright (C) 2021 Ryan Challinor (contact: awwbees@gmail.com)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
**/
//
// Granulator.cpp
// modularSynth
//
// Created by Ryan Challinor on 9/12/13.
//
//
#include "Granulator.h"
#include "SynthGlobals.h"
#include "Profiler.h"
#include "ChannelBuffer.h"
#include "juce_dsp/maths/juce_FastMathApproximations.h"
Granulator::Granulator()
{
Reset();
}
void Granulator::Reset()
{
mSpeed = 1;
mGrainLengthMs = 60;
mGrainOverlap = 10;
mPosRandomizeMs = 5;
mSpeedRandomize = 0;
mSpacingRandomize = 1;
mOctaves = false;
mWidth = 1;
for (int i = 0; i < ChannelBuffer::kMaxNumChannels; ++i)
{
mBiquad[i].SetFilterParams(10, sqrt(2) / 2);
mBiquad[i].SetFilterType(kFilterType_Highpass);
mBiquad[i].UpdateFilterCoeff();
mBiquad[i].Clear();
}
}
void Granulator::ProcessFrame(double time, ChannelBuffer* buffer, int bufferLength, double offset, float speed, float* output)
{
if (time + gInvSampleRateMs >= mNextGrainSpawnMs)
{
double startFromMs = mNextGrainSpawnMs;
if (startFromMs < time - 1000) //must have recently started processing, reset
startFromMs = time;
SpawnGrain(mNextGrainSpawnMs, offset, buffer->NumActiveChannels() == 2 ? mWidth : 0, speed);
mNextGrainSpawnMs = startFromMs + mGrainLengthMs * 1 / mGrainOverlap * ofRandom(1 - mSpacingRandomize / 2, 1 + mSpacingRandomize / 2);
}
for (int i = 0; i < MAX_GRAINS; ++i)
mGrains[i].Process(time, buffer, bufferLength, output);
for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
{
if (mGrainOverlap > 4)
output[ch] *= ofMap(mGrainOverlap, MAX_GRAINS, 4, .5f, 1); //lower volume on dense granulation, starting at 4 overlap
output[ch] = mBiquad[ch].Filter(output[ch]);
}
}
void Granulator::SpawnGrain(double time, double offset, float width, float speed)
{
if (mLiveMode)
{
float speedMult = speed + mSpeedRandomize;
if (mOctaves)
speedMult *= 1.5f;
float extraSpeed = MAX(0, speedMult * mSpeed - 1);
float extraMs = mGrainLengthMs * extraSpeed + mPosRandomizeMs;
float extraSamples = extraMs / gInvSampleRateMs;
offset -= extraSamples;
}
float speedMult = speed + ofRandom(-mSpeedRandomize, mSpeedRandomize);
float vol = 1;
if (mOctaves)
{
int random = gRandom() % 5;
if (random == 2) //fewer high-pitched ones
{
speedMult *= 1.5f;
vol = .5f;
}
else if (random == 3 || random == 4)
{
speedMult *= .75f;
}
}
offset += ofRandom(-mPosRandomizeMs, mPosRandomizeMs) / gInvSampleRateMs;
mGrains[mNextGrainIdx].Spawn(this, time, offset, speedMult, mGrainLengthMs, vol, width);
mNextGrainIdx = (mNextGrainIdx + 1) % MAX_GRAINS;
}
void Granulator::Draw(float x, float y, float w, float h, int bufferStart, int viewLength, int bufferLength)
{
for (int i = 0; i < MAX_GRAINS; ++i)
mGrains[i].DrawGrain(i, x, y, w, h, bufferStart, viewLength, bufferLength);
}
void Granulator::ClearGrains()
{
for (int i = 0; i < MAX_GRAINS; ++i)
mGrains[i].Clear();
}
void Grain::Spawn(Granulator* owner, double time, double pos, float speedMult, float lengthInMs, float vol, float width)
{
mOwner = owner;
mPos = pos;
mSpeedMult = speedMult;
mStartTime = time;
mEndTime = time + lengthInMs;
mStartToEnd = mEndTime - mStartTime;
mStartToEndInv = 1.0 / mStartToEnd;
mVol = vol;
mStereoPosition = ofRandom(-width, width);
mDrawPos = ofRandom(1);
}
inline double Grain::GetWindow(double time)
{
double phase = (time - mStartTime) * mStartToEndInv;
return .5 + .5 * juce::dsp::FastMathApproximations::cos<double>(phase * TWO_PI - PI);
}
void Grain::Process(double time, ChannelBuffer* buffer, int bufferLength, float* output)
{
if (time >= mStartTime && time <= mEndTime && mVol != 0)
{
mPos += mSpeedMult * mOwner->mSpeed;
float window = GetWindow(time);
for (int ch = 0; ch < buffer->NumActiveChannels(); ++ch)
{
float sample = GetInterpolatedSample(mPos, buffer, bufferLength, std::clamp(ch + mStereoPosition, 0.f, 1.f));
output[ch] += sample * window * mVol * (1 + (ch == 0 ? mStereoPosition : -mStereoPosition));
}
}
}
void Grain::DrawGrain(int idx, float x, float y, float w, float h, int bufferStart, int viewLength, int bufferLength)
{
float a = fmod((mPos - bufferStart), bufferLength) / viewLength;
if (a < 0 || a > 1)
return;
ofPushStyle();
ofFill();
float alpha = GetWindow(std::clamp(gTime, mStartTime, mEndTime));
ofSetColor(255, 0, 0, alpha * 255);
ofCircle(x + a * w, y + mDrawPos * h, MAX(3, h / MAX_GRAINS / 2));
ofPopStyle();
}
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