The implementation of rotate2d is clockwise and does not match the spec

[rockmao1]

The implementation code of rotate2d is as follows:
void mx_rotate_vector2(vec2 _in, float amount, out vec2 result)
{
float rotationRadians = radians(amount);
float sa = sin(rotationRadians);
float ca = cos(rotationRadians);
result = vec2(ca*_in.x + sa*_in.y, -sa*_in.x + ca*_in.y);
}

the rotate is clockwise, bug specs are as follows:
the amount to rotate, specified in degrees, with positive values rotating the
incoming vector counterclockwise