public static Color NearestNeighbour(Flat2DArray <Color> colors, Vector2 uv)
{
int x = (int)uv.x;
int y = (int)uv.y;
while (x < 0)
{
x += colors.width;
}
while (x >= colors.width)
{
x -= colors.width;
}
while (y < 0)
{
y += colors.height;
}
while (y >= colors.height)
{
y -= colors.height;
}
return(colors[x, y]);
}
// todo: UV parameter should be renamed to 'coordinate' since it's not in normalized space
public static Color Bicubic(Flat2DArray <Color> colors, Vector2 uv, bool snapToNearest)
{
while (uv.x < 0.0f)
{
uv.x += colors.width;
}
while (uv.x >= colors.width)
{
uv.x -= colors.width;
}
while (uv.y < 0.0f)
{
uv.y += colors.height;
}
while (uv.y >= colors.height)
{
uv.y -= colors.height;
}
int x1 = (int)uv.x, x0 = x1.Ring(colors.width, -1),
x2 = x1.Ring(colors.width, 1), x3 = x1.Ring(colors.width, 2);
int y1 = (int)uv.y, y0 = y1.Ring(colors.height, -1),
y2 = y1.Ring(colors.height, 1), y3 = y1.Ring(colors.height, 2);
Vector2 t = new Vector2(uv.x - x1, uv.y - y1);
Color h0 = CatmullRom(colors[x0, y0], colors[x0, y1], colors[x0, y2], colors[x0, y3], t.y, false);
Color h1 = CatmullRom(colors[x1, y0], colors[x1, y1], colors[x1, y2], colors[x1, y3], t.y, false);
Color h2 = CatmullRom(colors[x2, y0], colors[x2, y1], colors[x2, y2], colors[x2, y3], t.y, false);
Color h3 = CatmullRom(colors[x3, y0], colors[x3, y1], colors[x3, y2], colors[x3, y3], t.y, false);
Color result = CatmullRom(h0, h1, h2, h3, t.x, false);
if (!snapToNearest)
{
return(result);
}
return(new[] { colors[x1, y1], colors[x2, y1], colors[x1, y2], colors[x2, y2] }
.MinBy(c => Vector4.Distance(result, c)));
}