distortion_section.h

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#pragma once
 
#include "JuceHeader.h"
#include "open_gl_line_renderer.h"
#include "synth_section.h"
#include "digital_svf.h"
 
class SynthButton;
class SynthSlider;
class TabSelector;
class TextSelector;
class DistortionViewer;
 
class DistortionFilterResponse : public OpenGlLineRenderer {
  public:
    static constexpr int kResolution = 256;              
    static constexpr int kDefaultVisualSampleRate = 200000; 
 
    DistortionFilterResponse(const vital::output_map& mono_modulations);
    virtual ~DistortionFilterResponse();
 
    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 cutoff_range = cutoff_slider_->getMaximum() - cutoff_slider_->getMinimum();
      cutoff_slider_->setValue(cutoff_slider_->getValue() + delta.x * cutoff_range / getWidth());
      float resonance_range = resonance_slider_->getMaximum() - resonance_slider_->getMinimum();
      resonance_slider_->setValue(resonance_slider_->getValue() - delta.y * resonance_range / getHeight());
    }
 
    void setCutoffSlider(SynthSlider* slider) { cutoff_slider_ = slider; }
 
    void setResonanceSlider(SynthSlider* slider) { resonance_slider_ = slider; }
 
    void setBlendSlider(SynthSlider* slider) { blend_slider_ = slider; }
 
    void setActive(bool active) { active_ = active; }
 
  private:
    struct FilterResponseShader {
      static constexpr int kMaxStages = 5;
      OpenGLShaderProgram* shader;
      std::unique_ptr<OpenGLShaderProgram::Attribute> position;
 
      std::unique_ptr<OpenGLShaderProgram::Uniform> mix;
      std::unique_ptr<OpenGLShaderProgram::Uniform> midi_cutoff;
      std::unique_ptr<OpenGLShaderProgram::Uniform> resonance;
      std::unique_ptr<OpenGLShaderProgram::Uniform> drive;
      std::unique_ptr<OpenGLShaderProgram::Uniform> db24;
      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);
 
    bool active_;                       
    Point<int> last_mouse_position_;    
    vital::DigitalSvf filter_;          
    vital::SynthFilter::FilterState filter_state_;
 
    SynthSlider* cutoff_slider_;        
    SynthSlider* resonance_slider_;     
    SynthSlider* blend_slider_;         
 
    vital::Output* cutoff_output_;      
    vital::Output* resonance_output_;   
    vital::Output* blend_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(DistortionFilterResponse)
};
 
class DistortionSection : public SynthSection {
  public:
    static constexpr int kViewerResolution = 124; 
 
    DistortionSection(String name, const vital::output_map& mono_modulations);
 
    virtual ~DistortionSection();
 
    void paintBackground(Graphics& g) override;
 
    void paintBackgroundShadow(Graphics& g) override { if (isActive()) paintTabShadow(g); }
 
    void resized() override;
 
    void setActive(bool active) override;
 
    void sliderValueChanged(Slider* changed_slider) override;
 
    void setAllValues(vital::control_map& controls) override;
 
    void setFilterActive(bool active);
 
  private:
    std::unique_ptr<SynthButton> on_;             
    std::unique_ptr<TextSelector> type_;          
    std::unique_ptr<TextSelector> filter_order_;  
    std::unique_ptr<SynthSlider> drive_;          
    std::unique_ptr<SynthSlider> mix_;            
    std::unique_ptr<SynthSlider> filter_cutoff_;  
    std::unique_ptr<SynthSlider> filter_resonance_; 
    std::unique_ptr<SynthSlider> filter_blend_;   
    std::unique_ptr<DistortionViewer> distortion_viewer_; 
    std::unique_ptr<DistortionFilterResponse> filter_response_; 
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(DistortionSection)
};