Please add Max, Min, Clamp and Lerp
I'd love to have these functions. As a shader artist I miss them dearly when creating effects.
```
vec4 max(vec4 _c0, vec4 _c1) {
return max(_c0, _c1);
}
vec4 min(vec4 _c0, vec4 _c1) {
return min(_c0, _c1);
}
vec4 clamp(vec4 _c0, float a=0.0, float b=0.0) {
return clamp(_c0, a, b);
}
vec4 lerp(vec4 _c0, vec4 a, vec4 b) {
return a * (1.0 - _c0) + b * _c0;
}
```
I managed to add them into Hydro, but Hydra is a bit out of my depth, tho I had to name them maximum, minimum and clampBetween, since it would otherwise overwride other functions.
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