OpenGL ES 2.0 - rotate point around pivot point 2D (vertex shader)

Question

I'm trying to rotate vertices around some point in 2D. I found @Rabbid76 solution here https://stackoverflow.com/a/48156351/776388 but I need to rotate around z-vector.

Answer 1

I have found a solution

vec2 rotate(vec2 point, float degree, vec2 pivot)
{
    float radAngle = -radians(degree);// "-" - clockwise
    float x = point.x;
    float y = point.y;

    float rX = pivot.x + (x - pivot.x) * cos(radAngle) - (y - pivot.y) * sin(radAngle);
    float rY = pivot.y + (x - pivot.x) * sin(radAngle) + (y - pivot.y) * cos(radAngle);

    return vec2(rX, rY);
}