The ShaderFilter class lets you use a custom filter effect defined
as a Pixel Bender shader. Because the filter effect is written as
a Pixel Bender shader, the effect can be completely customized.
The filtered content is passed in to the shader as an image input,
and the result of the shader operation becomes the filter result.
Note:
The Shader filter is available in ActionScript starting with
Flash Player 10 and Adobe AIR 1.5.
To apply a shader filter to an object, you first create a Shader
instance representing the Pixel Bender shader that you are using.
For details on the procedure for creating a Shader instance and
on how to specify input image and parameter values, see
Working with Pixel Bender shaders
.
When using a shader as a filter, there are three important things
to keep in mind:
-
The shader must be defined to accept at least one input
image.
-
The filtered object (the display object or BitmapData object
to which the filter is applied) is passed to the shader as the first
input image value. Because of this, do not manually specify a value
for the first image input.
-
If the shader defines more that one input image, the additional
inputs must be specified manually (that is, by setting the
input
property
of any ShaderInput instance that belongs to the Shader instance).
Once you have a Shader object for your shader, you create a ShaderFilter instance.
This is the actual filter object that you use like any other filter.
To create a ShaderFilter that uses a Shader object, call the
ShaderFilter()
constructor and
pass the Shader object as an argument, as shown in this listing:
var myFilter:ShaderFilter = new ShaderFilter(myShader);
For a complete example of using a shader filter, see
Using a shader as a filter
.
