Specifying shader input and parameter values

Many Pixel Bender shaders are defined to use one or more input images that are used in the shader processing. For example, it’s common for a shader to accept a source image and output that image with a particular effect applied to it. Depending on how the shader is used the input value may be specified automatically or you may need to explicitly provide a value. Similarly, many shaders specify parameters that are used to customize the output of the shader. You must also explicitly set a value for each parameter before using the shader.

You use the Shader object’s data property to set shader inputs and parameters and to determine whether a particular shader expects inputs or parameters. The data property is a ShaderData instance.

• Identifying shader inputs and parameters
• Specifying shader input values
• Specifying shader parameter values