| clearCol | Color clear value. Ignored on depth/stencil attachments. |
| clearDep | Depth clear value. Ignored on color surfaces. |
| clearStenc | Stencil clear value. Ignored on color or depth-only surfaces. |
When the RenderPass starts, clear this attachment into the color or depth/stencil values given (depending on the format of this attachment). Changes loadAction to RenderBufferLoadAction.Clear.