void percentAdd(Pixel *pix, Pixel addition, byteFraction percent) {
static Pixel white = {0xFFFFFF};
//calculate the total percentage
uint16_t totalPercent = pix->color.p + percent;
//get the overflow (signed arithmetic)
byteFraction overflow = max(0, (int)totalPercent-255);
if (overflow > 0) {
//calculate fractions for the old and new parts
byteFraction oldFract = fract1(pix->color.p, totalPercent);
byteFraction newFract = fract1(percent, totalPercent);
//calculate the percentaged pixels and add
nMultiply(pix, oldFract);
nMultiply(&addition, newFract);
nAdd(pix, addition);
//lerp to white
nMix(pix, white, overflow, 255);
pix->color.p = 255;
} else {
nAdd(pix, addition);
pix->color.p = totalPercent;
}
}
void RenderSpring(cloth *clothItem, node cur, node step)
{
node adj;
int index = 0;
adj = nAdd(cur, step);
if(!( (adj.x>clothItem->width-1) || (adj.x<0) || (adj.y>clothItem->height-1) || (adj.y<0) ))
{
index = FindIndexInArray(cur.y, cur.x, clothItem->width);
glVertex3f(clothItem->positions[index].x, clothItem->positions[index].y, clothItem->positions[index].z);
index = FindIndexInArray(adj.y, adj.x, clothItem->width);
glVertex3f(clothItem->positions[index].x, clothItem->positions[index].y, clothItem->positions[index].z);
}
}
Pixel add(Pixel pix, Pixel addition) {
nAdd(&pix, addition);
return pix;
}
