OpenGL common functions

Clamp function
Clamp The function can limit randomly varying values to a given interval [min, max] Inside ：

template<class T>
T Clamp(T x, T min, T max)
{
    if (x > max)
        return max;
    if (x < min)
        return min;
    return x;
}

mod function
mod A function is a complement function , The format for ： mod(nExp1,nExp2), That is, the remainder of two numerical expressions after division

mix function
mix(x, y, a): x, y Linear aliasing , x(1-a) + y*a; a by 0 The result is x, a by 1 The result is y

smoothstep(start, end, parameter) function
Will return a 0 To 1 Value , This value represents the proportional distance between the minimum and maximum values of the parameter .smoothstep Function will be used to gradually but non linearly increase attributes over a period of time .

step(edge,x) function
step By way of x Compare with edges to generate step function .
For elements that return values i, If x[i]<edge[i], Then return to 0.0, Otherwise return to 1.0.

pow() function
pow(x, y) return x Of y The next power , namely xy

fract() function
fract(x): Take the decimal part

dot() function
dot(x, y): Dot product , Multiply the components separately after Add up ;
Given two n Dimension vector a=(a1,a2,…,an) and b=(b1,b2,…,bn), Find the dot product a·b=a1b1+a2b2+…+anbn.

sqrt() function
sqrt(x): x Root of