Lua Shader Common Functions
From GiderosMobile
| Function | Syntax | Description |
|---|---|---|
| abs | abs(x) | Returns the absolute of x. |
| sign | sign(x) | Returns the sign of x (-1, 0 or 1). |
| floor | floor(x) | Returns a value equal to the nearest integer that is less than or equal to x. |
| trunc | trunc(x) | Returns a value equal to the nearest integer to x whose absolute value is not larger than the absolute value of x. |
| round | round(x) | Returns a value equal to the nearest integer to x. |
| eround | round(x) | Returns a value equal to the nearest even integer to x. |
| ceil | round(x) | Returns a value equal to the nearest integer that is greater than or equal to x. |
| fract | round(x) | Returns 1/floor(x). |
| mod | mod(x,y) | Modulus, returns x-y*floor(x/y). |
| modf | modf(x,y) | Returns the fractional part of x and sets i to the integer part (as a whole number floating point value). |
| min | mod(x,y) | Returns the lower of x or y. |
| max | mod(x,y) | Returns the greater of x or y. |
| clamp | clamp(x,minV,maxV) | Returns min(max(x,minV),maxV). |
| mix | mix(x,y,a) | Returns the linear blend of x and y. i.e x*(1−a)+y*a |
| step | step(edge,x) | Returns 0.0 if x<edge, otherwise it returns 1.0. |
| smoothstep | smoothstep(edge0,edge1,x) | Returns 0.0 if x <= edge0 and 1.0 if x >= edge1 and performs smooth Hermite interpolation between 0 and 1 when edge0<x<edge1. |
| isnan | mix(x) | Returns true if x holds a NaN (not a number). |
| isinf | mix(x) | Returns true if x holds a positive infinity or negative infinity. |
