| Option Category | # # DIRECT3D POST-PROCESSING OPTIONS # |
| Description | This option sets the horizontal offset of the image created from the shadow mask image, set as a percentage from the top left corner. Value can be between 1.0 and -1.0 . |
| Full Command | -shadow_mask_uoffset <float> |
| Alt. Command | none |
| Reverse Command | none |
| Example | mame64 pacman -hlsl_enable -shadow_mask_image shadow-mask.png -shadow_mask_uoffset 0.5 |
| mame.ini Command | shadow_mask_uoffset |
| Command Default | 0.0 |
| Argument Format | <float> |