This class describes a shader.
| ActiveSubshader | Returns the active subshader or null if none is currently active. |
| ActiveSubshaderIndex | Returns the index of the active subshader or -1 if none is currently active. |
| SourceShader | The shader attached to this data set. |
| SubshaderCount | The number of subshaders used by this shader. |
| GetSubshader | Get a subshader. |