phaser_section.h

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#pragma once
 
#include "JuceHeader.h"
#include "synth_section.h"
#include "open_gl_line_renderer.h"
#include "phaser_filter.h"
#include "synth_module.h"
 
class SynthButton;
class TempoSelector;
class SynthSlider;
class SynthGuiInterface;
 
class PhaserResponse : public OpenGlLineRenderer {
public:
    static constexpr int kResolution = 256;
    static constexpr int kDefaultVisualSampleRate = 200000;
 
    PhaserResponse(const vital::output_map& mono_modulations);
 
    virtual ~PhaserResponse();
 
    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 setMixSlider(SynthSlider* slider) { mix_slider_ = slider; }
 
    void setActive(bool active) { active_ = active; }
 
    void setStyle(int style) { filter_state_.style = style; }
 
    void setDefaultBlend(vital::poly_float blend) { blend_setting_ = blend; }
 
private:
    struct FilterResponseShader {
        static constexpr int kMaxStages = 3;
        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> db24;
        std::unique_ptr<OpenGLShaderProgram::Uniform> stages[kMaxStages];
    };
 
    void drawFilterResponse(OpenGlWrapper& open_gl, bool animate);
 
    vital::poly_float getOutputTotal(const 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);
 
    SynthGuiInterface* parent_;
    bool active_;
    Point<int> last_mouse_position_;
 
    vital::PhaserFilter phaser_filter_;
    vital::SynthFilter::FilterState filter_state_;
    vital::poly_float mix_;
 
    SynthSlider* cutoff_slider_;
    SynthSlider* resonance_slider_;
    SynthSlider* blend_slider_;
    SynthSlider* mix_slider_;
 
    const vital::StatusOutput* phaser_cutoff_;
    const vital::Output* filter_mix_output_;
    const vital::Output* resonance_output_;
    const vital::Output* blend_output_;
 
    vital::poly_float blend_setting_;
 
    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(PhaserResponse)
};
 
class PhaserSection : public SynthSection {
public:
    PhaserSection(String name, const vital::output_map& mono_modulations);
 
    virtual ~PhaserSection();
 
    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> center_;
    std::unique_ptr<SynthSlider> mod_depth_;
    std::unique_ptr<SynthSlider> phase_offset_;
    std::unique_ptr<SynthSlider> dry_wet_;
    std::unique_ptr<SynthSlider> blend_;
 
    std::unique_ptr<PhaserResponse> phaser_response_;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PhaserSection)
};