Initial release — InstaGrain granular synthesizer v1.0
8-voice polyphonic granular synth (VST3/AU/LV2) with: - 128 grain pool per voice, Hann windowing, linear interpolation - Root note selector, sample rate correction, sustain pedal (CC64) - Scatter controls, direction modes (Fwd/Rev/PingPong), freeze - ADSR envelope, global filter (LP/HP/BP), reverb - Waveform display with grain visualization - Drag & drop sample loading, full state save/restore - CI/CD for Windows/macOS/Linux Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
hariel1985
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Source/WaveformDisplay.cpp
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201
Source/WaveformDisplay.cpp
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#include "WaveformDisplay.h"
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#include "LookAndFeel.h"
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WaveformDisplay::WaveformDisplay() {}
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void WaveformDisplay::setBuffer (const juce::AudioBuffer<float>* buffer)
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{
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audioBuffer = buffer;
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if (buffer != nullptr)
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{
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totalSourceSamples = buffer->getNumSamples();
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lastBufferSize = totalSourceSamples;
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}
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else
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{
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totalSourceSamples = 0;
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lastBufferSize = 0;
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}
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pathDirty = true;
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repaint();
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}
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void WaveformDisplay::setActiveGrains (const std::vector<GrainEngine::ActiveGrainInfo>& grains)
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{
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activeGrains = grains;
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repaint();
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}
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void WaveformDisplay::resized()
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{
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pathDirty = true;
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}
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void WaveformDisplay::rebuildWaveformPath (juce::Rectangle<float> bounds)
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{
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cachedWaveformPath.clear();
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if (audioBuffer == nullptr || audioBuffer->getNumSamples() == 0)
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return;
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const int numSamples = audioBuffer->getNumSamples();
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const float width = bounds.getWidth();
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const float height = bounds.getHeight();
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const float midY = bounds.getCentreY();
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const float* data = audioBuffer->getReadPointer (0);
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// Build filled waveform path
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int blockSize = std::max (1, numSamples / (int) width);
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// Top line (max values)
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cachedWaveformPath.startNewSubPath (bounds.getX(), midY);
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for (int x = 0; x < (int) width; ++x)
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{
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int sampleIndex = (int) ((float) x / width * (float) numSamples);
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sampleIndex = juce::jlimit (0, numSamples - 1, sampleIndex);
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float maxVal = -1.0f;
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for (int j = 0; j < blockSize && (sampleIndex + j) < numSamples; ++j)
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maxVal = std::max (maxVal, data[sampleIndex + j]);
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float topY = midY - maxVal * (height * 0.45f);
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cachedWaveformPath.lineTo ((float) x + bounds.getX(), topY);
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}
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// Bottom line (min values, reversed)
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for (int x = (int) width - 1; x >= 0; --x)
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{
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int sampleIndex = (int) ((float) x / width * (float) numSamples);
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sampleIndex = juce::jlimit (0, numSamples - 1, sampleIndex);
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float minVal = 1.0f;
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for (int j = 0; j < blockSize && (sampleIndex + j) < numSamples; ++j)
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minVal = std::min (minVal, data[sampleIndex + j]);
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float botY = midY - minVal * (height * 0.45f);
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cachedWaveformPath.lineTo ((float) x + bounds.getX(), botY);
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}
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cachedWaveformPath.closeSubPath();
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lastWidth = getWidth();
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lastHeight = getHeight();
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pathDirty = false;
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}
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void WaveformDisplay::paint (juce::Graphics& g)
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{
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auto bounds = getLocalBounds().toFloat();
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// Background gradient
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{
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juce::ColourGradient bgGrad (InstaGrainLookAndFeel::bgDark.darker (0.4f), 0, bounds.getY(),
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InstaGrainLookAndFeel::bgDark.darker (0.2f), 0, bounds.getBottom(), false);
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g.setGradientFill (bgGrad);
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g.fillRoundedRectangle (bounds, 4.0f);
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}
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// Border
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g.setColour (InstaGrainLookAndFeel::bgLight.withAlpha (0.3f));
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g.drawRoundedRectangle (bounds, 4.0f, 1.0f);
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// Grid lines
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g.setColour (InstaGrainLookAndFeel::bgLight.withAlpha (0.12f));
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for (int i = 1; i < 8; ++i)
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{
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float xLine = bounds.getX() + bounds.getWidth() * (float) i / 8.0f;
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g.drawVerticalLine ((int) xLine, bounds.getY(), bounds.getBottom());
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}
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// Center line
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g.setColour (InstaGrainLookAndFeel::bgLight.withAlpha (0.2f));
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float midY = bounds.getCentreY();
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g.drawHorizontalLine ((int) midY, bounds.getX(), bounds.getRight());
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if (audioBuffer == nullptr || audioBuffer->getNumSamples() == 0)
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{
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// "Drop sample here" text
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g.setColour (InstaGrainLookAndFeel::textSecondary);
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g.setFont (16.0f);
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g.drawText ("Drop a sample here or click Load Sample", bounds, juce::Justification::centred);
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return;
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}
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// Rebuild path if needed
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if (pathDirty || lastWidth != getWidth() || lastHeight != getHeight()
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|| lastBufferSize != audioBuffer->getNumSamples())
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{
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lastBufferSize = audioBuffer->getNumSamples();
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rebuildWaveformPath (bounds);
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}
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// Scatter range highlight
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if (scatterRange > 0.001f)
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{
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float posX = bounds.getX() + grainPosition * bounds.getWidth();
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float rangeW = scatterRange * bounds.getWidth();
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float left = std::max (bounds.getX(), posX - rangeW);
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float right = std::min (bounds.getRight(), posX + rangeW);
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g.setColour (juce::Colour (0x1800ff88));
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g.fillRect (left, bounds.getY(), right - left, bounds.getHeight());
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}
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// Waveform fill + stroke
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juce::Colour waveColour (0xffff8844);
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g.setColour (waveColour.withAlpha (0.5f));
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g.fillPath (cachedWaveformPath);
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g.setColour (waveColour.withAlpha (0.9f));
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g.strokePath (cachedWaveformPath, juce::PathStrokeType (1.0f));
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// Active grain rectangles
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if (totalSourceSamples > 0)
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{
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for (const auto& grain : activeGrains)
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{
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if (grain.startSample < 0) continue;
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float gx = bounds.getX() + ((float) grain.startSample / (float) totalSourceSamples) * bounds.getWidth();
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float gw = ((float) grain.lengthSamples / (float) totalSourceSamples) * bounds.getWidth();
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gw = std::max (2.0f, gw);
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float alpha = 0.6f * (1.0f - grain.progress); // fade as grain progresses
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g.setColour (InstaGrainLookAndFeel::accent.withAlpha (alpha));
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g.fillRect (gx, bounds.getY() + 2, gw, bounds.getHeight() - 4);
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}
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}
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// Position indicator line
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{
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float posX = bounds.getX() + grainPosition * bounds.getWidth();
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g.setColour (InstaGrainLookAndFeel::accent);
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g.drawVerticalLine ((int) posX, bounds.getY(), bounds.getBottom());
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// Glow
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g.setColour (InstaGrainLookAndFeel::accent.withAlpha (0.3f));
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g.fillRect (posX - 2.0f, bounds.getY(), 5.0f, bounds.getHeight());
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}
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}
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void WaveformDisplay::updatePositionFromMouse (const juce::MouseEvent& e)
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{
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auto bounds = getLocalBounds().toFloat();
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float pos = (float) (e.x - bounds.getX()) / bounds.getWidth();
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pos = juce::jlimit (0.0f, 1.0f, pos);
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grainPosition = pos;
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if (onPositionChanged)
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onPositionChanged (pos);
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repaint();
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}
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void WaveformDisplay::mouseDown (const juce::MouseEvent& e)
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{
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if (audioBuffer != nullptr && audioBuffer->getNumSamples() > 0)
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updatePositionFromMouse (e);
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}
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void WaveformDisplay::mouseDrag (const juce::MouseEvent& e)
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{
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if (audioBuffer != nullptr && audioBuffer->getNumSamples() > 0)
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updatePositionFromMouse (e);
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}
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