Class: Rugl::StateManager

Inherits:
Object
  • Object
show all
Defined in:
lib/rugl/state_manager.rb

Constant Summary collapse

HANDLERS = 
{
  blend: ->(gl, value) { State::Blend.apply(gl: gl, params: value) },
  depth: ->(gl, value) { State::Depth.apply(gl: gl, params: value) },
  stencil: ->(gl, value) { State::Stencil.apply(gl: gl, params: value) },
  scissor: ->(gl, value) { State::Scissor.apply(gl: gl, params: value) },
  cull: ->(gl, value) { State::Cull.apply(gl: gl, params: value) },
  polygon_offset: ->(gl, value) { State::PolygonOffset.apply(gl: gl, params: value) },
  color_mask: ->(gl, value) { State::ColorMask.apply(gl: gl, params: value) }
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(gl: nil) ⇒ StateManager

Returns a new instance of StateManager.



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# File 'lib/rugl/state_manager.rb', line 25

def initialize(gl: nil)
  @gl = gl
  @current = default_state
end

Instance Attribute Details

#current ⇒ Object (readonly)

Returns the value of attribute current.



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# File 'lib/rugl/state_manager.rb', line 23

def current
  @current
end

Instance Method Details

#apply(command_state, context:, props:) ⇒ Object 



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# File 'lib/rugl/state_manager.rb', line 30

def apply(command_state, context:, props:)
  return {} unless @gl
  return {} if command_state.nil? || command_state.empty?

  previous = {}

  command_state.each do |key, value|
    resolved = Dynamic.resolve(value, context: context, props: props)
    next if @current[key] == resolved

    previous[key] = @current[key]
    set_gl_state(key, resolved)
    @current[key] = deep_copy(resolved)
  end

  previous
end

#restore(previous_state) ⇒ Object 



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# File 'lib/rugl/state_manager.rb', line 48

def restore(previous_state)
  return if !@gl || previous_state.nil? || previous_state.empty?

  previous_state.each do |key, value|
    set_gl_state(key, value)
    @current[key] = deep_copy(value)
  end
  nil
end