GLSL Bezier Curve Points

bezier.glsl

vec2 bezier(float t, vec2 p0, vec2 p1, vec2 p2, vec2 p3)
{
    vec2 a = mix(p0, p1, t);
    vec2 b = mix(p1, p2, t);
    vec2 c = mix(p2, p3, t);
    return mix(mix(a, b, t), mix(b, c, t), t);
}