biggy
e4cea300db
Round 1 findings and fixes, all previously uncommitted: - FXProcessor per-slot DSP history repair (HEAD does not compile without it) - SynthVoice::getModulationValue, editor control-lock guard - ExactCompare.h naming the deliberate exact float comparisons - KnobLookAndFeel replacing the never-installed SerumLookAndFeel - 55 first-party compiler warnings to 0 - AGENT.md renamed to AGENTS.md across Source/ - graft repository context graph and its hooks - JANITOR_TASKS.md and UI_UX_AUDIT.md records
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
#include "FilterDisplay.h"
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#include "../ExactCompare.h"
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namespace serum
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{
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// Schematic frequency-response preview for this view only. It does not model the
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// real DSP in Source/Filter.cpp, nor the drive, the slope or modulation, so it is
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// not expected to match the nonlinear filter numerically.
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float FilterDisplay::magnitude (float freqHz, float cutoffHz, float res, int type)
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{
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const float w = (cutoffHz > 1.0f) ? freqHz / cutoffHz : 1.0f;
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const float q = 0.6f + res * 14.0f;
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const float w2 = w * w;
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const float denom = std::sqrt ((1.0f - w2) * (1.0f - w2) + (w / q) * (w / q));
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switch ((FilterModel) type)
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{
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case FilterModel::LadderHP: return (denom > 1e-6f) ? w2 / denom : 0.0f;
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case FilterModel::LadderBP: return (denom > 1e-6f) ? (w / q) / denom : 0.0f;
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case FilterModel::Screamer: return (denom > 1e-6f) ? (w / (q * 0.7f)) / denom : 0.0f;
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case FilterModel::Comb:
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return 0.5f + 0.5f * std::cos (2.0f * juce::MathConstants<float>::pi * freqHz / cutoffHz);
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case FilterModel::Formant:
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{
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float m = 0.0f;
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const float fc[3] = { cutoffHz * 0.5f, cutoffHz * 1.6f, cutoffHz * 3.2f };
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for (int i = 0; i < 3; ++i)
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{
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const float ww = freqHz / fc[i];
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const float dd = std::sqrt ((1.0f - ww * ww) * (1.0f - ww * ww) + (ww / q) * (ww / q));
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m += (ww / q) / (dd + 1e-6f);
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}
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return m / 3.0f;
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}
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case FilterModel::LadderLP:
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case FilterModel::Diode:
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case FilterModel::Count:
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default:
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return (denom > 1e-6f) ? 1.0f / denom : 0.0f;
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}
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}
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void FilterDisplay::setParams (int t, float c, float r, float d, int s)
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{
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if (type == t && ! changed (cutoff, c) && ! changed (res, r)
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&& ! changed (drive, d) && slope == s)
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return;
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type = t; cutoff = c; res = r; drive = d; slope = s;
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repaint();
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}
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void FilterDisplay::paint (juce::Graphics& g)
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{
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const auto b = getLocalBounds().toFloat();
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g.setColour (juce::Colours::black.withAlpha (0.4f));
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g.fillRoundedRectangle (b, 4.0f);
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g.setColour (theme::outline);
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g.drawRoundedRectangle (b.reduced (0.5f), 4.0f, 1.0f);
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if (! enabled)
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return;
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const float cutoffHz = maps::cutoffToHz (cutoff);
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const int n = 300;
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juce::Path path;
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path.startNewSubPath (b.getX() + 4.0f, b.getBottom() - 4.0f);
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for (int i = 0; i <= n; ++i)
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{
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const float logF = std::log10 (20.0f) + ((float) i / (float) n) * (std::log10 (20000.0f) - std::log10 (20.0f));
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const float freq = std::pow (10.0f, logF);
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const float mag = magnitude (freq, cutoffHz, res, type);
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const float db = juce::Decibels::gainToDecibels (mag + 1e-5f);
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const float x = b.getX() + 4.0f + ((float) i / (float) n) * (b.getWidth() - 8.0f);
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const float y = juce::jmap (db, -30.0f, 12.0f, b.getBottom() - 4.0f, b.getY() + 4.0f);
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path.lineTo (x, y);
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}
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path.lineTo (b.getRight() - 4.0f, b.getBottom() - 4.0f);
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path.closeSubPath();
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g.setColour (theme::accent.withAlpha (0.25f));
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g.fillPath (path);
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g.setColour (theme::accent);
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g.strokePath (path, juce::PathStrokeType (1.5f));
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}
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} // namespace serum
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