Class: GL::VertexArray

Inherits:
Object
  • Object
show all
Defined in:
lib/opengl-aux/vertex_array.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name = nil) {|_self| ... } ⇒ VertexArray

Returns a new instance of VertexArray.

Yields:

  • (_self)

Yield Parameters:


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# File 'lib/opengl-aux/vertex_array.rb', line 37

def initialize(name = nil)
  @name = name || 0
  yield self if block_given?
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name


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# File 'lib/opengl-aux/vertex_array.rb', line 35

def name
  @name
end

Class Method Details

.current_binding ⇒ Object 


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# File 'lib/opengl-aux/vertex_array.rb', line 18

def current_binding
  GL.glGetInteger(GL::GL_VERTEX_ARRAY_BINDING)
end

.preserve_binding ⇒ Object

Raises:

  • (ArgumentError) 

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# File 'lib/opengl-aux/vertex_array.rb', line 22

def preserve_binding
  raise ArgumentError, "No block given" unless block_given?
  binding = current_binding
  begin
    yield
  ensure
    GL.glBindVertexArray(binding)
  end
end

Instance Method Details

#bind ⇒ Object 


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# File 'lib/opengl-aux/vertex_array.rb', line 54

def bind
  if block_given?
    self.class.preserve_binding do
      bind
      yield self
    end
  else
    if @name == 0
      @name = GL.glGenVertexArrays(1)
      if @name == 0
        raise GL::GLCreateError, "Unable to allocate vertex array object"
      end
    end

    GL.glBindVertexArray(@name)
    self
  end
end

#delete ⇒ Object 


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# File 'lib/opengl-aux/vertex_array.rb', line 42

def delete
  if @name != 0
    GL.glDeleteVertexArrays(@name)
    @name = 0
  end
  self
end

#is_vertex_array? ⇒ Boolean

Returns:

  • (Boolean) 

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# File 'lib/opengl-aux/vertex_array.rb', line 50

def is_vertex_array?
  GL::glIsVertexArray(@name) != GL::GL_FALSE
end