| 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.
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():intheight: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):voidindex: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():intinput: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):voidwidth: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):voidpublic 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.
© 2009 Adobe Systems Incorporated. All rights reserved.
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