flanger_section.h

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#pragma once
 
#include "JuceHeader.h"
#include "synth_section.h"
#include "open_gl_line_renderer.h"
#include "comb_filter.h"
#include "synth_module.h"
 
class SynthButton;
class TempoSelector;
class SynthSlider;
class SynthGuiInterface;
 
class FlangerResponse : public OpenGlLineRenderer {
  public:
    static constexpr int kResolution = 512;
 
    static constexpr int kDefaultVisualSampleRate = 200000;
 
    static constexpr int kCombAlternatePeriod = 2;
 
    FlangerResponse(const vital::output_map& mono_modulations);
 
    virtual ~FlangerResponse();
 
    void init(OpenGlWrapper& open_gl) override;
 
    void render(OpenGlWrapper& open_gl, bool animate) override;
 
    void destroy(OpenGlWrapper& open_gl) override;
 
    void mouseDown(const MouseEvent& e) override {
      last_mouse_position_ = e.getPosition();
    }
 
    void mouseDrag(const MouseEvent& e) override {
      Point<int> delta = e.getPosition() - last_mouse_position_;
      last_mouse_position_ = e.getPosition();
 
      float center_range = center_slider_->getMaximum() - center_slider_->getMinimum();
      center_slider_->setValue(center_slider_->getValue() + delta.x * center_range / getWidth());
      float feedback_range = feedback_slider_->getMaximum() - feedback_slider_->getMinimum();
      feedback_slider_->setValue(feedback_slider_->getValue() - delta.y * feedback_range / getHeight());
    }
 
    void setCenterSlider(SynthSlider* slider) { center_slider_ = slider; }
 
    void setFeedbackSlider(SynthSlider* slider) { feedback_slider_ = slider; }
 
    void setMixSlider(SynthSlider* slider) { mix_slider_ = slider; }
 
    void setActive(bool active) { active_ = active; }
 
  private:
    struct FilterResponseShader {
      static constexpr int kMaxStages = 4;
      OpenGLShaderProgram* shader;
      std::unique_ptr<OpenGLShaderProgram::Attribute> position;
 
      std::unique_ptr<OpenGLShaderProgram::Uniform> mix;
      std::unique_ptr<OpenGLShaderProgram::Uniform> drive;
      std::unique_ptr<OpenGLShaderProgram::Uniform> midi_cutoff;
      std::unique_ptr<OpenGLShaderProgram::Uniform> resonance;
      std::unique_ptr<OpenGLShaderProgram::Uniform> stages[kMaxStages];
    };
 
    void drawFilterResponse(OpenGlWrapper& open_gl, bool animate);
 
    vital::poly_float getOutputTotal(vital::Output* output, vital::poly_float default_value);
 
    void setupFilterState();
 
    void loadShader(int index);
 
    void bind(OpenGLContext& open_gl_context);
 
    void unbind(OpenGLContext& open_gl_context);
 
    void renderLineResponse(OpenGlWrapper& open_gl, int index);
 
    SynthGuiInterface* parent_;
    bool active_;
    Point<int> last_mouse_position_;
 
    vital::CombFilter comb_filter_;
    vital::SynthFilter::FilterState filter_state_;
    vital::poly_float mix_;
 
    SynthSlider* center_slider_;
    SynthSlider* feedback_slider_;
    SynthSlider* mix_slider_;
 
    const vital::StatusOutput* flanger_frequency_;
    vital::Output* feedback_output_;
    vital::Output* mix_output_;
 
    FilterResponseShader response_shader_;
    std::unique_ptr<float[]> line_data_;
    GLuint vertex_array_object_;
    GLuint line_buffer_;
    GLuint response_buffer_;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(FlangerResponse)
};
 
class FlangerSection : public SynthSection {
  public:
    FlangerSection(String name, const vital::output_map& mono_modulations);
 
    virtual ~FlangerSection();
 
    void paintBackground(Graphics& g) override;
 
    void paintBackgroundShadow(Graphics& g) override { if (isActive()) paintTabShadow(g); }
 
    void resized() override;
 
    void setActive(bool active) override;
 
  private:
    std::unique_ptr<SynthButton> on_;
    std::unique_ptr<SynthSlider> frequency_;
    std::unique_ptr<SynthSlider> tempo_;
    std::unique_ptr<TempoSelector> sync_;
    std::unique_ptr<SynthSlider> feedback_;
    std::unique_ptr<SynthSlider> mod_depth_;
    std::unique_ptr<SynthSlider> center_;
    std::unique_ptr<SynthSlider> phase_offset_;
    std::unique_ptr<SynthSlider> dry_wet_;
 
    std::unique_ptr<FlangerResponse> flanger_response_;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(FlangerSection)
};