flash.display.ShaderInput - Adobe® Flex® 4 Language Reference (Flex 4)

Package	flash.display
Class	public final dynamic class ShaderInput
Inheritance	ShaderInput Object

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

A ShaderInput instance represents a single input image for a shader kernel. A kernel can be defined to accept zero, one, or more source images that are used in the kernel execution. A ShaderInput instance provides a mechanism for specifying the input image that is used when the shader executes. To specify a value for the input, create a BitmapData, ByteArray, or Vector.<Number> instance containing the image data and assign it to the input property.

The ShaderInput instance representing a Shader instance's input image is accessed as a property of the Shader instance's data property. The ShaderInput property has the same name as the input's name in the shader code. For example, if a shader defines an input named src, the ShaderInput instance representing the src input is available as the src property, as this example shows:

myShader.data.src.image = new BitmapData(50, 50, true, 0xFF990000);

For some uses of a Shader instance, you do not need to specify an input image, because it is automatically specified by the operation. You only need to specify an input when a Shader is used for the following:

Shader fill
ShaderFilter, only for the second or additional inputs if the shader is defined to use more than one input. (The object to which the filter is applied is automatically used as the first input.)
Shader blend mode, only for the third or additional inputs if the shader is defined to use more than two inputs. (The objects being blended are automatically used as the first and second inputs.)
ShaderJob background execution

If the shader is being executed using a ShaderJob instance to process a ByteArray containing a linear array of data, set the ShaderInput instance's height to 1 and width to the number of 32-bit floating point values in the ByteArray. In that case, the input in the shader must be defined with the image1 data type.

Generally, developer code does not create a ShaderInput instance directly. A ShaderInput instance is created for each of a shader's inputs when the Shader instance is created.

Public Properties

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	Property		Defined By
		channels : int [read-only] The number of channels that a shader input expects.	ShaderInput
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		height : int The height of the shader input.	ShaderInput
		index : int [read-only] The zero-based index of the input in the shader, indicating the order of the input definitions in the shader.	ShaderInput
		input : Object The input data that is used when the shader executes.	ShaderInput
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		width : int The width of the shader input.	ShaderInput

Public Methods

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	Method		Defined By
		ShaderInput() Creates a ShaderInput instance.	ShaderInput
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object

Property Detail

channels

property

channels:int [read-only]

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The number of channels that a shader input expects. This property must be accounted for when the input data is a ByteArray or Vector.<Number> instance.

Implementation
public function get channels():int

height

property

height:int

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The height of the shader input. This property is only used when the input data is a ByteArray or Vector.<Number> instance. When the input is a BitmapData instance the height is automatically determined.

Implementation
public function get height():int
public function set height(value:int):void

index

property

index:int [read-only]

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The zero-based index of the input in the shader, indicating the order of the input definitions in the shader.

Implementation
public function get index():int

input

property

input:Object

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The input data that is used when the shader executes. This property can be a BitmapData instance, a ByteArray instance, or a Vector.<Number> instance.

If a ByteArray value is assigned to the input property, the following conditions must be met:

The height and width properties must be set.
The byte array's contents must only consist of 32-bit floating-point values. These values can be written using the ByteArray.writeFloat() method.
The total length in bytes of the ByteArray must be exactly width times height times channels times 4.
The byte array's endian property must be Endian.LITTLE_ENDIAN.

If a Vector.<Number> instance is assigned to the input property, the length of the Vector must be equal to width times height times channels.

Implementation
public function get input():Object
public function set input(value:Object):void

width

property

width:int

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

The width of the shader input. This property is only used when the input data is a ByteArray or Vector.<Number> instance. When the input is a BitmapData instance the width is automatically determined.

Implementation
public function get width():int
public function set width(value:int):void

Constructor Detail

ShaderInput

()

Constructor

public function ShaderInput()

Language Version:

ActionScript 3.0

Runtime Versions:

Flash Player 10, AIR 1.5

Creates a ShaderInput instance. Developer code does not call the ShaderInput constructor directly. A ShaderInput instance is created for each of a shader's inputs when the Shader instance is created.