Represents an opaque identifier of a specific Pass in a Shader.
See Also: Shader, ShaderUtil, ComputeShader.EnableKeyword, Pass.
| PassIndex | The index of the pass within the subshader (Read Only). | 
| SubshaderIndex | The index of the subshader within the shader (Read Only). | 
| operator != | Returns true if the pass identifiers are not the same. Otherwise, returns false. | 
| operator == | Returns true if the pass identifiers are the same. Otherwise, returns false. |