Shader patterns

float frequency = .5;
float trianglewave = abs(2 * frac(x * frequency) - 1); // repeating triangle wave /\/\/\...
float squarewave = round(abs(2 * frac(x * frequency + .25) - 1)); // repeating square wave

float aaedge(float width)
{
        vec2 uv = getBaseTextureCoordinates();
        vec2 border = min( uv, 1 - uv );
        vec2 fw = fwidth( uv ) * width;
        vec2 g = saturate(border / fw);
        return g.x * g.y;
}