Phaser Class: WebGLFilterManager

filterStack :Array

offsetX :Number

offsetY :Number

applyFilterPass(filter, filterArea, width, height)

Applies the filter to the specified area.

Name	Type	Description
`filter`	PIXI.AbstractFilter	the filter that needs to be applied
`filterArea`	PIXI.Texture	TODO - might need an update
`width`	Number	the horizontal range of the filter
`height`	Number	the vertical range of the filter

begin(renderSession, buffer)

Name	Type	Description
`renderSession`	RenderSession	-
`buffer`	ArrayBuffer	-

destroy()

Destroys the filter and removes it from the filter stack.

initShaderBuffers()

Initialises the shader buffers.

popFilter()

Removes the last filter from the filter stack and doesn't return it.

pushFilter(filterBlock)

Applies the filter and adds it to the current filter stack.

Name	Type	Description
`filterBlock`	Object	the filter that will be pushed to the current filter stack

setContext(gl)

Initialises the context and the properties.

Name	Type	Description
`gl`	WebGLContext	the current WebGL drawing context