         @framebuffer = null
         @is_complete = true
 
+Framebuffer.active_rect = new vec4.create()
+
 module.exports = {Framebuffer, MainFramebuffer}

{Filter} = require './filters.coffee'

component_types =

        ## doesn't work for limiting color clearing
        ## unless we enable preserveDrawingBuffer but may be inefficient
        #render_manager.gl.scissor(left, top, size_x, size_y)
        vec4.set Framebuffer.active_rect, left, top, size_x, size_y
        
    disable: ->
        {gl} = @context.render_manager
