Class: Carbuncle::Shader

Inherits:
Object show all
Defined in:
gems/carbuncle-graphics/mrblib/shader.rb

Constant Summary collapse

VALID_UNIFORM_CLASSES = 
[
  Integer, Float,
  Carbuncle::Point, Carbuncle::Vector3, Carbuncle::Vector4,
  Carbuncle::Rect, Carbuncle::Color, Carbuncle::Matrix,
  Carbuncle::Texture
].freeze

Instance Method Summary collapse

Instance Method Details

#add_uniform(name, uniform_class, value = nil) ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 10

def add_uniform(name, uniform_class, value = nil)
  symbol = name.to_sym
  variable = name.to_s.underscore
  @uniform_types[symbol]  = uniform_class
  @uniform_values[symbol] = value.presence || default_value_for(uniform_class)
  @uniform_locations[symbol] = find_uniform_location(name)
  if @uniform_locations[symbol] < 0
    raise ArgumentError, "Couldn't find location for uniform '#{name}'"
  end
  unless VALID_UNIFORM_CLASSES.include?(uniform_class)
    raise ArgumentError, "#{uniform_class.name} is not a valid uniform type."
  end

  define_singleton_method(variable) { @uniform_values[symbol] }
  define_singleton_method(:"#{variable}=") { |new_value| assign_uniform(symbol, new_value) }
end

#assign_uniform(name, value) ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 31

def assign_uniform(name, value)
  symbol = name.to_sym
  klass = @uniform_types[symbol]
  unless @uniform_types.key?(symbol)
    raise ArgumentError, "Uniform '#{name}' does not exists on shader."
  end

  value = value.to_f if klass == Float
  value = value.to_i if klass == Integer
  unless value.is_a?(klass)
    raise ArgumentError, "Uniform '#{name}' should be of type #{klass.name}"
  end

  @uniform_values[symbol] = value
end

#default_value_for(uniform_class) ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 63

def default_value_for(uniform_class)
  return 0 if uniform_class == Integer
  return 0.0 if uniform_class == Float

  uniform_class.new
end

#uniforms ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 53

def uniforms
  @uniform_values.dup
end

#uniforms=(values) ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 57

def uniforms=(values)
  values.each do |name, value|
    assign_uniform(name, value)
  end
end

#update(dt = 0) ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 27

def update(dt = 0)
  update_uniforms
end

#update_uniforms ⇒ Object 



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# File 'gems/carbuncle-graphics/mrblib/shader.rb', line 47

def update_uniforms
  @uniform_values.each do |symbol, value|
    send_uniform_value(@uniform_locations[symbol], value)
  end
end