This struct holds data for a single blit operation.
| destRect | Destination Rect area that the blit operation wants to blit to. |
| srcRect | Source Rect area that the blit operation wants to blit from. |
| srcTex | Source render texture that the blit operation wants to blit from. |
| srcTexArraySlice | Describes source texture's desired array slice. Texture2D will have array slice 1. |