深度或模板比较函数。
| Disabled | 禁用深度或模板测试。 |
| Never | 从不通过深度或模板测试。 |
| Less | Pass depth or stencil test when new value is less than current value. |
| Equal | 当值相等时通过深度或模板测试。 |
| LessEqual | Pass depth or stencil test when new value is less or equal than current value. |
| Greater | Pass depth or stencil test when new value is greater than current value. |
| NotEqual | 当值不同时通过深度或模板测试。 |
| GreaterEqual | Pass depth or stencil test when new value is greater or equal than current value. |
| Always | 始终通过深度或模板测试。 |