mccap079

// Version 3 - https://stackoverflow.com/a/10625698/1757149
float random( vec2 p )
{
    vec2 K1 = vec2(
        23.14069263277926, // e^pi (Gelfond's constant)
         2.665144142690225 // 2^sqrt(2) (Gelfond–Schneider constant)
    );
    return fract( cos( dot(p,K1) ) * 12345.6789 );
}

mccap079

float map(float value, float min1, float max1, float min2, float max2)
{
    return min2 + (value - min1) * (max2 - min2) / (max1 - min1);
}