Contents

module Ruck
  
  module Oscillator
    include UGen
    TWO_PI = 2 * Math::PI
  
    def self.included(base)
      base.instance_eval do
        linkable_attr :freq
        linkable_attr :phase
      end
    end
  
    def phase_forward
      @phase = (@phase + freq.to_f / SAMPLE_RATE.to_f) % 1.0
    end
  end
  
  module Generators
    
    class SinOsc
      include Source
      include Oscillator

      linkable_attr :freq
      linkable_attr :gain

      def initialize(attrs = {})
        parse_attrs({ :freq => 440.0,
                      :gain => 1.0 }.merge(attrs))
        @phase = 0.0
        @last = 0.0
      end

      def next(now)
        return @last if @now == now
        @now = now
        @last = gain * Math.sin(phase * TWO_PI)
        phase_forward
        @last
      end
    
      def attr_names
        [:freq, :gain, :phase]
      end
    end

    class SawOsc
      include Source
      include Oscillator

      linkable_attr :gain

      def initialize(attrs = {})
        parse_attrs({ :freq => 440.0,
                      :gain => 1.0 }.merge(attrs))
        @phase = 0.0
        @last = 0.0
      end

      def next(now)
        return @last if @now == now
        @now = now
        @last = ((phase * 2.0) - 1.0) * gain
        phase_forward
        @last
      end
    
      def attr_names
        [:freq, :gain, :phase]
      end
    end

    class TriOsc
      include Source
      include Oscillator

      linkable_attr :gain

      def initialize(attrs = {})
        parse_attrs({ :freq => 440.0,
                      :gain => 1.0 }.merge(attrs))
        @phase = 0.0
        @last = 0.0
      end

      def next(now)
        return @last if @now == now
        @now = now
        @last = if phase < 0.5
          phase * 4.0 - 1.0
        else
          1.0 - ((phase - 0.5) * 4.0)
        end * gain
        phase_forward
        @last
      end
    
      def attr_names
        [:freq, :gain, :phase]
      end
    end
    
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
ruck-0.1.2	lib/ruck/ugen/oscillators.rb
ruck-0.1.0	lib/ruck/ugen/oscillators.rb