This extension adds language support for GLSL ES 100 (WebGL 1 and OpenGL ES 1.00) and GLSL ES 300 (WebGL 2 and OpenGL ES 3.00). It supports all the WebGL-compatible GLSL extensions too. It supports ...
The easing function parameter is optional, by default a linear function is used. This function takes a t value in parameter which goes linearly from 0.0 to 1.0 and must returns your easing value.