mirror of
https://github.com/SFML/SFML.git
synced 2024-11-25 04:41:05 +08:00
1213 lines
41 KiB
C++
1213 lines
41 KiB
C++
////////////////////////////////////////////////////////////
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// Headers
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////////////////////////////////////////////////////////////
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#include <SFML/Graphics.hpp>
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#include <SFML/Audio.hpp>
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#include <algorithm>
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#include <iostream>
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#include <limits>
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#include <memory>
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#include <vector>
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#include <cmath>
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namespace
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{
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constexpr auto windowWidth = 800u;
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constexpr auto windowHeight = 600u;
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constexpr auto pi = 3.14159265359f;
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constexpr auto sqrt2 = 2.0f * 0.707106781186547524401f;
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std::filesystem::path resourcesDir()
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{
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#ifdef SFML_SYSTEM_IOS
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return "";
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#else
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return "resources";
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#endif
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}
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} // namespace
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////////////////////////////////////////////////////////////
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// Base class for effects
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////////////////////////////////////////////////////////////
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class Effect : public sf::Drawable
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{
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public:
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static void setFont(const sf::Font& font)
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{
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s_font = &font;
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}
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const std::string& getName() const
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{
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return m_name;
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}
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void update(float time, float x, float y)
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{
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onUpdate(time, x, y);
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}
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void draw(sf::RenderTarget& target, sf::RenderStates states) const override
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{
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onDraw(target, states);
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}
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void start()
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{
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onStart();
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}
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void stop()
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{
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onStop();
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}
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void handleKey(sf::Keyboard::Key key)
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{
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onKey(key);
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}
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protected:
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Effect(std::string name) : m_name(std::move(name))
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{
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}
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static const sf::Font& getFont()
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{
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assert(s_font != nullptr && "Cannot get font until setFont() is called");
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return *s_font;
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}
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private:
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// Virtual functions to be implemented in derived effects
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virtual void onUpdate(float time, float x, float y) = 0;
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virtual void onDraw(sf::RenderTarget& target, sf::RenderStates states) const = 0;
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virtual void onStart() = 0;
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virtual void onStop() = 0;
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virtual void onKey(sf::Keyboard::Key)
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{
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}
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std::string m_name;
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// NOLINTNEXTLINE(readability-identifier-naming)
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static inline const sf::Font* s_font{nullptr};
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};
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////////////////////////////////////////////////////////////
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// Surround Sound / Positional Audio Effect / Attenuation
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////////////////////////////////////////////////////////////
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class Surround : public Effect
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{
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public:
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Surround() : Effect("Surround / Attenuation")
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{
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m_listener.setPosition({(windowWidth - 20.f) / 2.f, (windowHeight - 20.f) / 2.f});
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m_listener.setFillColor(sf::Color::Red);
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// Load the music file
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if (!m_music.openFromFile(resourcesDir() / "doodle_pop.ogg"))
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std::cerr << "Failed to load " << (resourcesDir() / "doodle_pop.ogg").string() << std::endl;
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// Set the music to loop
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m_music.setLoop(true);
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// Set attenuation to a nice value
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m_music.setAttenuation(0.04f);
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}
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void onUpdate(float /*time*/, float x, float y) override
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{
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m_position = {windowWidth * x - 10.f, windowHeight * y - 10.f};
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m_music.setPosition({m_position.x, m_position.y, 0.f});
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}
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void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
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{
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auto statesCopy(states);
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statesCopy.transform = sf::Transform::Identity;
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statesCopy.transform.translate(m_position);
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target.draw(m_listener, states);
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target.draw(m_soundShape, statesCopy);
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}
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void onStart() override
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{
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// Synchronize listener audio position with graphical position
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sf::Listener::setPosition({m_listener.getPosition().x, m_listener.getPosition().y, 0.f});
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m_music.play();
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}
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void onStop() override
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{
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m_music.stop();
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}
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private:
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sf::CircleShape m_listener{20.f};
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sf::CircleShape m_soundShape{20.f};
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sf::Vector2f m_position;
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sf::Music m_music;
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};
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////////////////////////////////////////////////////////////
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// Pitch / Volume Effect
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////////////////////////////////////////////////////////////
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class PitchVolume : public Effect
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{
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public:
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PitchVolume() :
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Effect("Pitch / Volume"),
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m_pitchText(getFont(), "Pitch: " + std::to_string(m_pitch)),
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m_volumeText(getFont(), "Volume: " + std::to_string(m_volume))
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{
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// Load the music file
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if (!m_music.openFromFile(resourcesDir() / "doodle_pop.ogg"))
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std::cerr << "Failed to load " << (resourcesDir() / "doodle_pop.ogg").string() << std::endl;
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// Set the music to loop
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m_music.setLoop(true);
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// We don't care about attenuation in this effect
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m_music.setAttenuation(0.f);
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// Set initial pitch
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m_music.setPitch(m_pitch);
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// Set initial volume
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m_music.setVolume(m_volume);
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m_pitchText.setPosition({windowWidth / 2.f - 120.f, windowHeight / 2.f - 80.f});
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m_volumeText.setPosition({windowWidth / 2.f - 120.f, windowHeight / 2.f - 30.f});
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}
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void onUpdate(float /*time*/, float x, float y) override
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{
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m_pitch = std::clamp(2.f * x, 0.f, 2.f);
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m_volume = std::clamp(100.f * (1.f - y), 0.f, 100.f);
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m_music.setPitch(m_pitch);
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m_music.setVolume(m_volume);
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m_pitchText.setString("Pitch: " + std::to_string(m_pitch));
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m_volumeText.setString("Volume: " + std::to_string(m_volume));
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}
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void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
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{
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target.draw(m_pitchText, states);
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target.draw(m_volumeText, states);
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}
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void onStart() override
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{
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// We set the listener position back to the default
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// so that the music is right on top of the listener
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sf::Listener::setPosition({0.f, 0.f, 0.f});
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m_music.play();
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}
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void onStop() override
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{
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m_music.stop();
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}
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private:
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float m_pitch{1.f};
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float m_volume{100.f};
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sf::Text m_pitchText;
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sf::Text m_volumeText;
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sf::Music m_music;
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};
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////////////////////////////////////////////////////////////
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// Attenuation Effect
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////////////////////////////////////////////////////////////
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class Attenuation : public Effect
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{
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public:
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Attenuation() : Effect("Attenuation"), m_text(getFont())
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{
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m_listener.setPosition({(windowWidth - 20.f) / 2.f, (windowHeight - 20.f) / 2.f + 100.f});
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m_listener.setFillColor(sf::Color::Red);
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m_soundShape.setFillColor(sf::Color::Magenta);
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// Sound cone parameters
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static constexpr auto coneHeight = windowHeight * 2.f;
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static constexpr auto outerConeAngle = sf::degrees(120.f);
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static constexpr auto innerConeAngle = sf::degrees(30.f);
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// Set common properties of both cones
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for (auto* cone : {&m_soundConeOuter, &m_soundConeInner})
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{
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cone->setPointCount(3);
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cone->setPoint(0, {0.f, 0.f});
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cone->setPosition({20.f, 20.f});
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}
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m_soundConeOuter.setFillColor(sf::Color::Black);
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m_soundConeInner.setFillColor(sf::Color::Cyan);
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// Make each cone based on their angle and height
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static constexpr auto makeCone = [](auto& shape, const auto& angle)
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{
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const auto theta = sf::degrees(90.f) - (angle / 2);
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const auto x = coneHeight / std::tan(theta.asRadians());
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shape.setPoint(1, {-x, coneHeight});
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shape.setPoint(2, {x, coneHeight});
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};
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makeCone(m_soundConeOuter, outerConeAngle);
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makeCone(m_soundConeInner, innerConeAngle);
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// Load the music file
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if (!m_music.openFromFile(resourcesDir() / "doodle_pop.ogg"))
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std::cerr << "Failed to load " << (resourcesDir() / "doodle_pop.ogg").string() << std::endl;
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// Set the music to loop
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m_music.setLoop(true);
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// Set attenuation factor
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m_music.setAttenuation(m_attenuation);
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// Set direction to face "downwards"
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m_music.setDirection({0.f, 1.f, 0.f});
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// Set cone
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m_music.setCone({innerConeAngle, outerConeAngle, 0.f});
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m_text.setString(
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"Attenuation factor dampens full volume of sound while within inner cone based on distance to "
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"listener.\nCone outer gain determines "
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"volume of sound while outside outer cone.\nWhen within outer cone, volume is linearly interpolated "
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"between "
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"inner and outer volumes.");
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m_text.setCharacterSize(18);
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m_text.setPosition({20.f, 20.f});
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}
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void onUpdate(float /*time*/, float x, float y) override
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{
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m_position = {windowWidth * x - 10.f, windowHeight * y - 10.f};
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m_music.setPosition({m_position.x, m_position.y, 0.f});
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}
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void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
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{
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auto statesCopy(states);
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statesCopy.transform = sf::Transform::Identity;
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statesCopy.transform.translate(m_position);
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target.draw(m_soundConeOuter, statesCopy);
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target.draw(m_soundConeInner, statesCopy);
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target.draw(m_soundShape, statesCopy);
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target.draw(m_listener, states);
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target.draw(m_text, states);
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}
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void onStart() override
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{
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// Synchronize listener audio position with graphical position
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sf::Listener::setPosition({m_listener.getPosition().x, m_listener.getPosition().y, 0.f});
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m_music.play();
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}
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void onStop() override
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{
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m_music.stop();
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}
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private:
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sf::CircleShape m_listener{20.f};
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sf::CircleShape m_soundShape{20.f};
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sf::ConvexShape m_soundConeOuter;
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sf::ConvexShape m_soundConeInner;
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sf::Text m_text;
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sf::Vector2f m_position;
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sf::Music m_music;
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float m_attenuation{0.01f};
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};
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////////////////////////////////////////////////////////////
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// Tone Generator
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////////////////////////////////////////////////////////////
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class Tone : public sf::SoundStream, public Effect
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{
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public:
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Tone() :
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Effect("Tone Generator"),
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m_instruction(getFont(), "Press up and down arrows to change the current wave type"),
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m_currentType(getFont(), "Wave Type: Triangle"),
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m_currentAmplitude(getFont(), "Amplitude: 0.05"),
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m_currentFrequency(getFont(), "Frequency: 200 Hz")
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{
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m_instruction.setPosition({windowWidth / 2.f - 370.f, windowHeight / 2.f - 200.f});
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m_currentType.setPosition({windowWidth / 2.f - 150.f, windowHeight / 2.f - 100.f});
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m_currentAmplitude.setPosition({windowWidth / 2.f - 150.f, windowHeight / 2.f - 50.f});
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m_currentFrequency.setPosition({windowWidth / 2.f - 150.f, windowHeight / 2.f});
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sf::SoundStream::initialize(1, sampleRate, {sf::SoundChannel::Mono});
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}
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void onUpdate(float /*time*/, float x, float y) override
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{
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m_amplitude = std::clamp(0.2f * (1.f - y), 0.f, 0.2f);
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m_frequency = std::clamp(500.f * x, 0.f, 500.f);
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m_currentAmplitude.setString("Amplitude: " + std::to_string(m_amplitude));
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m_currentFrequency.setString("Frequency: " + std::to_string(m_frequency) + " Hz");
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}
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void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
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{
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target.draw(m_instruction, states);
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target.draw(m_currentType, states);
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target.draw(m_currentAmplitude, states);
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target.draw(m_currentFrequency, states);
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}
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void onStart() override
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{
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// We set the listener position back to the default
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// so that the tone is right on top of the listener
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sf::Listener::setPosition({0.f, 0.f, 0.f});
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play();
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}
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void onStop() override
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{
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SoundStream::stop();
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}
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void onKey(sf::Keyboard::Key key) override
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{
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auto ticks = 0;
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if (key == sf::Keyboard::Key::Down)
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ticks = 1; // Forward
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else if (key == sf::Keyboard::Key::Up)
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ticks = 3; // Reverse
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while (ticks--)
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{
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switch (m_type)
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{
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case Type::Sine:
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m_type = Type::Square;
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m_currentType.setString("Wave Type: Square");
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break;
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case Type::Square:
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m_type = Type::Triangle;
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m_currentType.setString("Wave Type: Triangle");
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break;
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case Type::Triangle:
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m_type = Type::Sawtooth;
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m_currentType.setString("Wave Type: Sawtooth");
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break;
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case Type::Sawtooth:
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m_type = Type::Sine;
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m_currentType.setString("Wave Type: Sine");
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break;
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}
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}
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}
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private:
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bool onGetData(sf::SoundStream::Chunk& chunk) override
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{
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const auto period = 1.f / m_frequency;
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for (auto i = 0u; i < chunkSize; ++i)
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{
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auto value = 0.f;
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switch (m_type)
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{
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case Type::Sine:
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{
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value = m_amplitude * std::sin(2 * pi * m_frequency * m_time);
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break;
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}
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case Type::Square:
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{
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value = m_amplitude *
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(2 * (2 * std::floor(m_frequency * m_time) - std::floor(2 * m_frequency * m_time)) + 1);
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break;
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}
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case Type::Triangle:
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{
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value = 4 * m_amplitude / period *
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std::abs(std::fmod(((std::fmod((m_time - period / 4), period)) + period), period) -
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period / 2) -
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m_amplitude;
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break;
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}
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case Type::Sawtooth:
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{
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value = m_amplitude * 2 * (m_time / period - std::floor(0.5f + m_time / period));
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break;
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}
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}
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m_sampleBuffer[i] = static_cast<std::int16_t>(std::lround(value * std::numeric_limits<std::int16_t>::max()));
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m_time += timePerSample;
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}
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chunk.sampleCount = chunkSize;
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chunk.samples = m_sampleBuffer.data();
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return true;
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}
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void onSeek(sf::Time) override
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{
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// It doesn't make sense to seek in a tone generator
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}
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enum class Type
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{
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Sine,
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Square,
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Triangle,
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Sawtooth
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};
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static constexpr unsigned int sampleRate{44100};
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static constexpr std::size_t chunkSize{sampleRate / 100};
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static constexpr float timePerSample{1.f / static_cast<float>(sampleRate)};
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std::vector<std::int16_t> m_sampleBuffer = std::vector<std::int16_t>(chunkSize, 0);
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Type m_type{Type::Triangle};
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float m_amplitude{0.05f};
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float m_frequency{220};
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float m_time{};
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sf::Text m_instruction;
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sf::Text m_currentType;
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sf::Text m_currentAmplitude;
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sf::Text m_currentFrequency;
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};
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////////////////////////////////////////////////////////////
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// Dopper Shift Effect
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////////////////////////////////////////////////////////////
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class Doppler : public sf::SoundStream, public Effect
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{
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public:
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Doppler() :
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Effect("Doppler Shift"),
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m_currentVelocity(getFont(), "Velocity: " + std::to_string(m_velocity)),
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m_currentFactor(getFont(), "Doppler Factor: " + std::to_string(m_factor))
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{
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m_listener.setPosition({(windowWidth - 20.f) / 2.f, (windowHeight - 20.f) / 2.f});
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m_listener.setFillColor(sf::Color::Red);
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m_position.y = (windowHeight - 20.f) / 2.f - 40.f;
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m_currentVelocity.setPosition({windowWidth / 2.f - 150.f, windowHeight * 3.f / 4.f - 50.f});
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m_currentFactor.setPosition({windowWidth / 2.f - 150.f, windowHeight * 3.f / 4.f});
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// Set attenuation to a nice value
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setAttenuation(0.05f);
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sf::SoundStream::initialize(1, sampleRate, {sf::SoundChannel::Mono});
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}
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void onUpdate(float time, float x, float y) override
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{
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m_velocity = std::clamp(150.f * (1.f - y), 0.f, 150.f);
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m_factor = std::clamp(x, 0.f, 1.f);
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|
m_currentVelocity.setString("Velocity: " + std::to_string(m_velocity));
|
|
m_currentFactor.setString("Doppler Factor: " + std::to_string(m_factor));
|
|
|
|
m_position.x = std::fmod(time, 8.f) * windowWidth / 8.f;
|
|
|
|
setPosition({m_position.x, m_position.y, 0.f});
|
|
setVelocity({m_velocity, 0.f, 0.f});
|
|
setDopplerFactor(m_factor);
|
|
}
|
|
|
|
void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
|
|
{
|
|
auto statesCopy(states);
|
|
statesCopy.transform = sf::Transform::Identity;
|
|
statesCopy.transform.translate(m_position - sf::Vector2f({20.f, 0.f}));
|
|
|
|
target.draw(m_listener, states);
|
|
target.draw(m_soundShape, statesCopy);
|
|
target.draw(m_currentVelocity, states);
|
|
target.draw(m_currentFactor, states);
|
|
}
|
|
|
|
void onStart() override
|
|
{
|
|
// Synchronize listener audio position with graphical position
|
|
sf::Listener::setPosition({m_listener.getPosition().x, m_listener.getPosition().y, 0.f});
|
|
|
|
play();
|
|
}
|
|
|
|
void onStop() override
|
|
{
|
|
SoundStream::stop();
|
|
}
|
|
|
|
private:
|
|
bool onGetData(sf::SoundStream::Chunk& chunk) override
|
|
{
|
|
const auto period = 1.f / m_frequency;
|
|
|
|
for (auto i = 0u; i < chunkSize; ++i)
|
|
{
|
|
const auto value = m_amplitude * 2 * (m_time / period - std::floor(0.5f + m_time / period));
|
|
|
|
m_sampleBuffer[i] = static_cast<std::int16_t>(std::lround(value * std::numeric_limits<std::int16_t>::max()));
|
|
m_time += timePerSample;
|
|
}
|
|
|
|
chunk.sampleCount = chunkSize;
|
|
chunk.samples = m_sampleBuffer.data();
|
|
|
|
return true;
|
|
}
|
|
|
|
void onSeek(sf::Time) override
|
|
{
|
|
// It doesn't make sense to seek in a tone generator
|
|
}
|
|
|
|
static constexpr unsigned int sampleRate{44100};
|
|
static constexpr std::size_t chunkSize{sampleRate / 100};
|
|
static constexpr float timePerSample{1.f / static_cast<float>(sampleRate)};
|
|
|
|
std::vector<std::int16_t> m_sampleBuffer = std::vector<std::int16_t>(chunkSize, 0);
|
|
float m_amplitude{0.05f};
|
|
float m_frequency{220};
|
|
float m_time{};
|
|
|
|
float m_velocity{0.f};
|
|
float m_factor{1.f};
|
|
sf::CircleShape m_listener{20.f};
|
|
sf::CircleShape m_soundShape{20.f};
|
|
sf::Vector2f m_position;
|
|
sf::Text m_currentVelocity;
|
|
sf::Text m_currentFactor;
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Processing base class
|
|
////////////////////////////////////////////////////////////
|
|
class Processing : public Effect
|
|
{
|
|
public:
|
|
void onUpdate([[maybe_unused]] float time, float x, float y) override
|
|
{
|
|
m_position = {windowWidth * x - 10.f, windowHeight * y - 10.f};
|
|
m_music.setPosition({m_position.x, m_position.y, 0.f});
|
|
}
|
|
|
|
void onDraw(sf::RenderTarget& target, sf::RenderStates states) const override
|
|
{
|
|
auto statesCopy(states);
|
|
statesCopy.transform = sf::Transform::Identity;
|
|
statesCopy.transform.translate(m_position);
|
|
|
|
target.draw(m_listener, states);
|
|
target.draw(m_soundShape, statesCopy);
|
|
target.draw(m_enabledText);
|
|
target.draw(m_instructions);
|
|
}
|
|
|
|
void onStart() override
|
|
{
|
|
// Synchronize listener audio position with graphical position
|
|
sf::Listener::setPosition({m_listener.getPosition().x, m_listener.getPosition().y, 0.f});
|
|
|
|
m_music.play();
|
|
}
|
|
|
|
void onStop() override
|
|
{
|
|
m_music.stop();
|
|
}
|
|
|
|
protected:
|
|
Processing(std::string name) :
|
|
Effect(std::move(name)),
|
|
m_enabledText(getFont(), "Processing: Enabled"),
|
|
m_instructions(getFont(), "Press Space to enable/disable processing")
|
|
{
|
|
m_listener.setPosition({(windowWidth - 20.f) / 2.f, (windowHeight - 20.f) / 2.f});
|
|
m_listener.setFillColor(sf::Color::Red);
|
|
|
|
m_enabledText.setPosition({windowWidth / 2.f - 120.f, windowHeight * 3.f / 4.f - 50.f});
|
|
m_instructions.setPosition({windowWidth / 2.f - 250.f, windowHeight * 3.f / 4.f});
|
|
|
|
// Load the music file
|
|
if (!m_music.openFromFile(resourcesDir() / "doodle_pop.ogg"))
|
|
std::cerr << "Failed to load " << (resourcesDir() / "doodle_pop.ogg").string() << std::endl;
|
|
|
|
// Set the music to loop
|
|
m_music.setLoop(true);
|
|
|
|
// Set attenuation to a nice value
|
|
m_music.setAttenuation(0.0f);
|
|
}
|
|
|
|
sf::Music& getMusic()
|
|
{
|
|
return m_music;
|
|
}
|
|
|
|
const std::shared_ptr<bool>& getEnabled() const
|
|
{
|
|
return m_enabled;
|
|
}
|
|
|
|
private:
|
|
void onKey(sf::Keyboard::Key key) override
|
|
{
|
|
if (key == sf::Keyboard::Key::Space)
|
|
*m_enabled = !*m_enabled;
|
|
|
|
m_enabledText.setString(*m_enabled ? "Processing: Enabled" : "Processing: Disabled");
|
|
}
|
|
|
|
sf::CircleShape m_listener{20.f};
|
|
sf::CircleShape m_soundShape{20.f};
|
|
sf::Vector2f m_position;
|
|
sf::Music m_music;
|
|
std::shared_ptr<bool> m_enabled{std::make_shared<bool>(true)};
|
|
sf::Text m_enabledText;
|
|
sf::Text m_instructions;
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Biquad Filter (https://github.com/dimtass/DSP-Cpp-filters)
|
|
////////////////////////////////////////////////////////////
|
|
class BiquadFilter : public Processing
|
|
{
|
|
protected:
|
|
struct Coefficients
|
|
{
|
|
float a0{};
|
|
float a1{};
|
|
float a2{};
|
|
float b1{};
|
|
float b2{};
|
|
float c0{};
|
|
float d0{};
|
|
};
|
|
|
|
using Processing::Processing;
|
|
|
|
void setCoefficients(const Coefficients& coefficients)
|
|
{
|
|
auto& music = getMusic();
|
|
|
|
struct State
|
|
{
|
|
float xnz1{};
|
|
float xnz2{};
|
|
float ynz1{};
|
|
float ynz2{};
|
|
};
|
|
|
|
// We use a mutable lambda to tie the lifetime of the state and coefficients to the lambda itself
|
|
// This is necessary since the Echo object will be destroyed before the Music object
|
|
// While the Music object exists, it is possible that the audio engine will try to call
|
|
// this lambda hence we need to always have usable coefficients and state until the Music and the
|
|
// associated lambda are destroyed
|
|
music.setEffectProcessor(
|
|
[coefficients,
|
|
enabled = getEnabled(),
|
|
state = std::vector<State>(music.getChannelCount())](const float* inputFrames,
|
|
unsigned int& inputFrameCount,
|
|
float* outputFrames,
|
|
unsigned int& outputFrameCount,
|
|
unsigned int frameChannelCount) mutable
|
|
{
|
|
for (auto frame = 0u; frame < outputFrameCount; ++frame)
|
|
{
|
|
for (auto channel = 0u; channel < frameChannelCount; ++channel)
|
|
{
|
|
auto& channelState = state[channel];
|
|
|
|
const auto xn = inputFrames ? inputFrames[channel] : 0.f; // Read silence if no input data available
|
|
const auto yn = coefficients.a0 * xn + coefficients.a1 * channelState.xnz1 +
|
|
coefficients.a2 * channelState.xnz2 - coefficients.b1 * channelState.ynz1 -
|
|
coefficients.b2 * channelState.ynz2;
|
|
|
|
channelState.xnz2 = channelState.xnz1;
|
|
channelState.xnz1 = xn;
|
|
channelState.ynz2 = channelState.ynz1;
|
|
channelState.ynz1 = yn;
|
|
|
|
outputFrames[channel] = *enabled ? yn : xn;
|
|
}
|
|
|
|
inputFrames += (inputFrames ? frameChannelCount : 0u);
|
|
outputFrames += frameChannelCount;
|
|
}
|
|
|
|
// We processed data 1:1
|
|
inputFrameCount = outputFrameCount;
|
|
});
|
|
}
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// High-pass Filter (https://github.com/dimtass/DSP-Cpp-filters)
|
|
////////////////////////////////////////////////////////////
|
|
struct HighPassFilter : BiquadFilter
|
|
{
|
|
HighPassFilter() : BiquadFilter("High-pass Filter")
|
|
{
|
|
static constexpr auto cutoffFrequency = 2000.f;
|
|
|
|
const auto c = std::tan(pi * cutoffFrequency / static_cast<float>(getMusic().getSampleRate()));
|
|
|
|
Coefficients coefficients;
|
|
|
|
coefficients.a0 = 1.f / (1.f + sqrt2 * c + std::pow(c, 2.f));
|
|
coefficients.a1 = -2.f * coefficients.a0;
|
|
coefficients.a2 = coefficients.a0;
|
|
coefficients.b1 = 2.f * coefficients.a0 * (std::pow(c, 2.f) - 1.f);
|
|
coefficients.b2 = coefficients.a0 * (1.f - sqrt2 * c + std::pow(c, 2.f));
|
|
|
|
setCoefficients(coefficients);
|
|
}
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Low-pass Filter (https://github.com/dimtass/DSP-Cpp-filters)
|
|
////////////////////////////////////////////////////////////
|
|
struct LowPassFilter : BiquadFilter
|
|
{
|
|
LowPassFilter() : BiquadFilter("Low-pass Filter")
|
|
{
|
|
static constexpr auto cutoffFrequency = 500.f;
|
|
|
|
const auto c = 1.f / std::tan(pi * cutoffFrequency / static_cast<float>(getMusic().getSampleRate()));
|
|
|
|
Coefficients coefficients;
|
|
|
|
coefficients.a0 = 1.f / (1.f + sqrt2 * c + std::pow(c, 2.f));
|
|
coefficients.a1 = 2.f * coefficients.a0;
|
|
coefficients.a2 = coefficients.a0;
|
|
coefficients.b1 = 2.f * coefficients.a0 * (1.f - std::pow(c, 2.f));
|
|
coefficients.b2 = coefficients.a0 * (1.f - sqrt2 * c + std::pow(c, 2.f));
|
|
|
|
setCoefficients(coefficients);
|
|
}
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Echo (miniaudio implementation)
|
|
////////////////////////////////////////////////////////////
|
|
struct Echo : Processing
|
|
{
|
|
Echo() : Processing("Echo")
|
|
{
|
|
auto& music = getMusic();
|
|
|
|
static constexpr auto delay = 0.2f;
|
|
static constexpr auto decay = 0.75f;
|
|
static constexpr auto wet = 0.8f;
|
|
static constexpr auto dry = 1.f;
|
|
|
|
const auto channelCount = music.getChannelCount();
|
|
const auto sampleRate = music.getSampleRate();
|
|
const auto delayInFrames = static_cast<unsigned int>(static_cast<float>(sampleRate) * delay);
|
|
|
|
// We use a mutable lambda to tie the lifetime of the state to the lambda itself
|
|
// This is necessary since the Echo object will be destroyed before the Music object
|
|
// While the Music object exists, it is possible that the audio engine will try to call
|
|
// this lambda hence we need to always have a usable state until the Music and the
|
|
// associated lambda are destroyed
|
|
music.setEffectProcessor(
|
|
[delayInFrames,
|
|
enabled = getEnabled(),
|
|
buffer = std::vector<float>(delayInFrames * channelCount, 0.f),
|
|
cursor = 0u](const float* inputFrames,
|
|
unsigned int& inputFrameCount,
|
|
float* outputFrames,
|
|
unsigned int& outputFrameCount,
|
|
unsigned int frameChannelCount) mutable
|
|
{
|
|
for (auto frame = 0u; frame < outputFrameCount; ++frame)
|
|
{
|
|
for (auto channel = 0u; channel < frameChannelCount; ++channel)
|
|
{
|
|
const auto input = inputFrames ? inputFrames[channel] : 0.f; // Read silence if no input data available
|
|
const auto bufferIndex = (cursor * frameChannelCount) + channel;
|
|
buffer[bufferIndex] = (buffer[bufferIndex] * decay) + (input * dry);
|
|
outputFrames[channel] = *enabled ? buffer[bufferIndex] * wet : input;
|
|
}
|
|
|
|
cursor = (cursor + 1) % delayInFrames;
|
|
|
|
inputFrames += (inputFrames ? frameChannelCount : 0u);
|
|
outputFrames += frameChannelCount;
|
|
}
|
|
|
|
// We processed data 1:1
|
|
inputFrameCount = outputFrameCount;
|
|
});
|
|
}
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
// Reverb (https://github.com/sellicott/DSP-FFMpeg-Reverb)
|
|
////////////////////////////////////////////////////////////
|
|
class Reverb : public Processing
|
|
{
|
|
public:
|
|
Reverb() : Processing("Reverb")
|
|
{
|
|
auto& music = getMusic();
|
|
|
|
static constexpr auto sustain = 0.7f; // [0.f; 1.f]
|
|
|
|
const auto channelCount = music.getChannelCount();
|
|
const auto sampleRate = music.getSampleRate();
|
|
|
|
std::vector<ReverbFilter<float>> filters;
|
|
filters.reserve(channelCount);
|
|
|
|
for (auto i = 0u; i < channelCount; ++i)
|
|
filters.emplace_back(sampleRate, sustain);
|
|
|
|
// We use a mutable lambda to tie the lifetime of the state to the lambda itself
|
|
// This is necessary since the Echo object will be destroyed before the Music object
|
|
// While the Music object exists, it is possible that the audio engine will try to call
|
|
// this lambda hence we need to always have a usable state until the Music and the
|
|
// associated lambda are destroyed
|
|
music.setEffectProcessor(
|
|
[filters, enabled = getEnabled()](const float* inputFrames,
|
|
unsigned int& inputFrameCount,
|
|
float* outputFrames,
|
|
unsigned int& outputFrameCount,
|
|
unsigned int frameChannelCount) mutable
|
|
{
|
|
for (auto frame = 0u; frame < outputFrameCount; ++frame)
|
|
{
|
|
for (auto channel = 0u; channel < frameChannelCount; ++channel)
|
|
{
|
|
const auto input = inputFrames ? inputFrames[channel] : 0.f; // Read silence if no input data available
|
|
outputFrames[channel] = *enabled ? filters[channel](input) : input;
|
|
}
|
|
|
|
inputFrames += (inputFrames ? frameChannelCount : 0u);
|
|
outputFrames += frameChannelCount;
|
|
}
|
|
|
|
// We processed data 1:1
|
|
inputFrameCount = outputFrameCount;
|
|
});
|
|
}
|
|
|
|
private:
|
|
template <typename T>
|
|
class AllPassFilter
|
|
{
|
|
public:
|
|
AllPassFilter(std::size_t delay, float theGain) : m_buffer(delay, {}), m_gain(theGain)
|
|
{
|
|
}
|
|
|
|
T operator()(T input)
|
|
{
|
|
const auto output = m_buffer[m_cursor];
|
|
input = static_cast<T>(input + m_gain * output);
|
|
m_buffer[m_cursor] = input;
|
|
m_cursor = (m_cursor + 1) % m_buffer.size();
|
|
return static_cast<T>(-m_gain * input + output);
|
|
}
|
|
|
|
private:
|
|
std::vector<T> m_buffer;
|
|
std::size_t m_cursor{};
|
|
const float m_gain{};
|
|
};
|
|
|
|
|
|
template <typename T>
|
|
class FIRFilter
|
|
{
|
|
public:
|
|
FIRFilter(std::vector<float> taps) : m_taps(std::move(taps))
|
|
{
|
|
}
|
|
|
|
T operator()(T input)
|
|
{
|
|
m_buffer[m_cursor] = input;
|
|
m_cursor = (m_cursor + 1) % m_buffer.size();
|
|
|
|
T output{};
|
|
|
|
for (auto i = 0u; i < m_taps.size(); ++i)
|
|
output += static_cast<T>(m_taps[i] * m_buffer[(m_cursor + i) % m_buffer.size()]);
|
|
|
|
return output;
|
|
}
|
|
|
|
private:
|
|
const std::vector<float> m_taps;
|
|
std::vector<T> m_buffer = std::vector<T>(m_taps.size(), {});
|
|
std::size_t m_cursor{};
|
|
};
|
|
|
|
template <typename T>
|
|
class ReverbFilter
|
|
{
|
|
public:
|
|
ReverbFilter(unsigned int sampleRate, float feedbackGain) :
|
|
m_allPass{{sampleRate / 10, 0.6f}, {sampleRate / 30, -0.6f}, {sampleRate / 90, 0.6f}, {sampleRate / 270, -0.6f}},
|
|
m_fir({0.003369f, 0.002810f, 0.001758f, 0.000340f, -0.001255f, -0.002793f, -0.004014f, -0.004659f,
|
|
-0.004516f, -0.003464f, -0.001514f, 0.001148f, 0.004157f, 0.006986f, 0.009003f, 0.009571f,
|
|
0.008173f, 0.004560f, -0.001120f, -0.008222f, -0.015581f, -0.021579f, -0.024323f, -0.021933f,
|
|
-0.012904f, 0.003500f, 0.026890f, 0.055537f, 0.086377f, 0.115331f, 0.137960f, 0.150407f,
|
|
0.150407f, 0.137960f, 0.115331f, 0.086377f, 0.055537f, 0.026890f, 0.003500f, -0.012904f,
|
|
-0.021933f, -0.024323f, -0.021579f, -0.015581f, -0.008222f, -0.001120f, 0.004560f, 0.008173f,
|
|
0.009571f, 0.009003f, 0.006986f, 0.004157f, 0.001148f, -0.001514f, -0.003464f, -0.004516f,
|
|
-0.004659f, -0.004014f, -0.002793f, -0.001255f, 0.000340f, 0.001758f, 0.002810f, 0.003369f}),
|
|
m_buffer(sampleRate / 5, {}), // sample rate / 5 = 200ms buffer size
|
|
m_feedbackGain(feedbackGain)
|
|
{
|
|
}
|
|
|
|
T operator()(T input)
|
|
{
|
|
auto output = static_cast<T>(0.7f * input + m_feedbackGain * m_buffer[m_cursor]);
|
|
|
|
for (auto& f : m_allPass)
|
|
output = f(output);
|
|
|
|
output = m_fir(output);
|
|
|
|
m_buffer[m_cursor] = output;
|
|
m_cursor = (m_cursor + 1) % m_buffer.size();
|
|
|
|
output += 0.5f * m_buffer[(m_cursor + 1 * m_interval - 1) % m_buffer.size()];
|
|
output += 0.25f * m_buffer[(m_cursor + 2 * m_interval - 1) % m_buffer.size()];
|
|
output += 0.125f * m_buffer[(m_cursor + 3 * m_interval - 1) % m_buffer.size()];
|
|
|
|
return 0.6f * output + input;
|
|
}
|
|
|
|
private:
|
|
AllPassFilter<T> m_allPass[4];
|
|
FIRFilter<T> m_fir;
|
|
std::vector<T> m_buffer;
|
|
std::size_t m_cursor{};
|
|
const std::size_t m_interval{m_buffer.size() / 3};
|
|
const float m_feedbackGain{};
|
|
};
|
|
};
|
|
|
|
|
|
////////////////////////////////////////////////////////////
|
|
/// Entry point of application
|
|
///
|
|
/// \return Application exit code
|
|
///
|
|
////////////////////////////////////////////////////////////
|
|
int main()
|
|
{
|
|
// Create the main window
|
|
sf::RenderWindow window(sf::VideoMode({windowWidth, windowHeight}),
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"SFML Sound Effects",
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sf::Style::Titlebar | sf::Style::Close);
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window.setVerticalSyncEnabled(true);
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// Load the application font and pass it to the Effect class
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const auto font = sf::Font::loadFromFile(resourcesDir() / "tuffy.ttf").value();
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Effect::setFont(font);
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// Create the effects
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Surround surroundEffect;
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PitchVolume pitchVolumeEffect;
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Attenuation attenuationEffect;
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Tone toneEffect;
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Doppler dopplerEffect;
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HighPassFilter highPassFilterEffect;
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LowPassFilter lowPassFilterEffect;
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Echo echoEffect;
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Reverb reverbEffect;
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const std::array<Effect*, 9> effects{&surroundEffect,
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&pitchVolumeEffect,
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&attenuationEffect,
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&toneEffect,
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&dopplerEffect,
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&highPassFilterEffect,
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&lowPassFilterEffect,
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&echoEffect,
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&reverbEffect};
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std::size_t current = 0;
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effects[current]->start();
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// Create the messages background
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const auto textBackgroundTexture = sf::Texture::loadFromFile(resourcesDir() / "text-background.png").value();
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sf::Sprite textBackground(textBackgroundTexture);
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textBackground.setPosition({0.f, 520.f});
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textBackground.setColor(sf::Color(255, 255, 255, 200));
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// Create the description text
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sf::Text description(font, "Current effect: " + effects[current]->getName(), 20);
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description.setPosition({10.f, 522.f});
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description.setFillColor(sf::Color(80, 80, 80));
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// Create the instructions text
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sf::Text instructions(font, "Press left and right arrows to change the current effect", 20);
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instructions.setPosition({280.f, 544.f});
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instructions.setFillColor(sf::Color(80, 80, 80));
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// Create the playback device text
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auto playbackDeviceName = sf::PlaybackDevice::getDevice();
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sf::Text playbackDevice(font, "Current playback device: " + playbackDeviceName.value_or("None"), 20);
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playbackDevice.setPosition({10.f, 566.f});
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playbackDevice.setFillColor(sf::Color(80, 80, 80));
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// Create the playback device instructions text
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sf::Text playbackDeviceInstructions(font, "Press F1 to change device", 20);
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playbackDeviceInstructions.setPosition({565.f, 566.f});
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playbackDeviceInstructions.setFillColor(sf::Color(80, 80, 80));
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// Start the game loop
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const sf::Clock clock;
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while (window.isOpen())
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{
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// Process events
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while (const auto event = window.pollEvent())
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{
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// Close window: exit
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if (event.is<sf::Event::Closed>())
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window.close();
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if (const auto* keyPressed = event.getIf<sf::Event::KeyPressed>())
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{
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switch (keyPressed->code)
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{
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// Escape key: exit
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case sf::Keyboard::Key::Escape:
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window.close();
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break;
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|
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// Left arrow key: previous effect
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case sf::Keyboard::Key::Left:
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effects[current]->stop();
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if (current == 0)
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current = effects.size() - 1;
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else
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--current;
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effects[current]->start();
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description.setString("Current effect: " + effects[current]->getName());
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break;
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|
|
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// Right arrow key: next effect
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case sf::Keyboard::Key::Right:
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effects[current]->stop();
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if (current == effects.size() - 1)
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current = 0;
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else
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++current;
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effects[current]->start();
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description.setString("Current effect: " + effects[current]->getName());
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break;
|
|
|
|
// F1 key: change playback device
|
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case sf::Keyboard::Key::F1:
|
|
{
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|
// We need to query the list every time we want to change
|
|
// since new devices could have been added in the mean time
|
|
const auto devices = sf::PlaybackDevice::getAvailableDevices();
|
|
const auto currentDevice = sf::PlaybackDevice::getDevice();
|
|
auto next = currentDevice;
|
|
|
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for (auto iter = devices.begin(); iter != devices.end(); ++iter)
|
|
{
|
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if (*iter == currentDevice)
|
|
{
|
|
const auto nextIter = std::next(iter);
|
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next = (nextIter == devices.end()) ? devices.front() : *nextIter;
|
|
break;
|
|
}
|
|
}
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|
|
|
if (next)
|
|
{
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if (!sf::PlaybackDevice::setDevice(*next))
|
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std::cerr << "Failed to set the playback device to: " << *next << std::endl;
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|
|
|
playbackDeviceName = sf::PlaybackDevice::getDevice();
|
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playbackDevice.setString("Current playback device: " + playbackDeviceName.value_or("None"));
|
|
}
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|
|
|
break;
|
|
}
|
|
|
|
default:
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|
effects[current]->handleKey(keyPressed->code);
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|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Update the current example
|
|
const auto [x, y] = sf::Vector2f(sf::Mouse::getPosition(window)).cwiseDiv(sf::Vector2f(window.getSize()));
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|
effects[current]->update(clock.getElapsedTime().asSeconds(), x, y);
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|
|
|
// Clear the window
|
|
window.clear(sf::Color(50, 50, 50));
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|
|
|
// Draw the current example
|
|
window.draw(*effects[current]);
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|
|
|
// Draw the text
|
|
window.draw(textBackground);
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|
window.draw(instructions);
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|
window.draw(description);
|
|
window.draw(playbackDevice);
|
|
window.draw(playbackDeviceInstructions);
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|
|
|
// Finally, display the rendered frame on screen
|
|
window.display();
|
|
}
|
|
|
|
// Stop effect so that tone generators don't have to keep generating data while being destroyed
|
|
effects[current]->stop();
|
|
}
|