Set the opacity of a scroll screen.
This Function takes the opacity specified as a fixed point value and converts it to one of the 32 color calculation ratios that a scroll screen can use (value is floored to the nearest ratio). Color Calculation is turned on if Opacity < 1.0, or off if Opacity>= 1.0. Color calculation is unchanged if value is negative.
- Note
- Color ratios only apply to highest priority pixels in the frame
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When VDP2 ColorCalcMode is set to UseColorAddition, all scrolls with opacity < 1.0 will use color addition in place of their specified ratios.
- Parameters
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| opacity | Fxp decimal value between 0.0 and 1.0 representing pixel opacity for the scroll screen (Default 1.0) |
