Depth or stencil comparison function.
| Disabled | Depth or stencil test is disabled. |
| Never | Never pass depth or stencil test. |
| Less | Pass depth or stencil test when new value is less than old one. |
| Equal | Pass depth or stencil test when values are equal. |
| LessEqual | Pass depth or stencil test when new value is less or equal than old one. |
| Greater | Pass depth or stencil test when new value is greater than old one. |
| NotEqual | Pass depth or stencil test when values are different. |
| GreaterEqual | Pass depth or stencil test when new value is greater or equal than old one. |
| Always | Always pass depth or stencil test. |