SetOpacity()

template<class ScreenType , int16_t Id, uint16_t On>

static void SRL::VDP2::ScrollScreen< ScreenType, Id, On >::SetOpacity ( Math::Fxp opacity = 1.0 )

inlinestatic

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 frame

When VDP2 ColorCalcMode is set to UseColorAddition, all scrolls with opacity < 1.0 will use color addition in place of their specified ratios.

Parameters

opacity

Fxp decimal value between 0.0 and 1.0 representing pixel opacity for the scroll screen (Default 1.0)