// TODO: Document GLSL Shaders 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. 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.

Constructor

new ()

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.

Variables

read onlychannels:Int

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

filter:Context3DTextureFilter

The texture filter to use when binding this shader input.

This property is not available when targeting Flash.

height:Int

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

read onlyindex:Dynamic

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

input:T

The input data that is used when the shader executes. This property can be a BitmapData instance, a ByteArray instance, or a Vector. 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. instance is assigned to the input property, the length of the Vector must be equal to width times height times channels.

mipFilter:Context3DMipFilter

The mip filter to use when binding this shader input.

This property is not available when targeting Flash.

width:Int

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

wrap:Context3DWrapMode

The wrap mode to use when binding this shader input.

This property is not available when targeting Flash.