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. | 
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