Lerp and int/float conversions

[megamarc]

This sample function in the wiki:

Code:

float lerp(float v0, float v1, float t) {
 return v0 + t * (v1 - v0);
}

Is the simplified one, it only works if the independent variable t ranges from [0,1]. What if your t goes in the range [3, 5] for example?

But you figured out well the meaning of the line you talk about: returns an index in the interval [7, 0] from the current scanline value in the range [170, vres], that is the lower portion of the screen where the palette lightening happens. Raster effects in action