| Option Category | # # DIRECT3D POST-PROCESSING OPTIONS # |
| Description | This option sets the level of alpha blending applied to the shadow mask image. The highest level is 1.0 (fully blended) and the lowest is 0.0 (no blending). |
| Full Command | -shadow_mask_alpha <float> |
| Alt. Command | none |
| Reverse Command | none |
| Example | mame64 pacman -hlsl_enable -shadow_mask_alpha 0.3 |
| mame.ini Command | shadow_mask_alpha |
| Command Default | 0.0 |
| Argument Format | <float> |