isf 0.1.0

Parsing, Deserialization and Serialization of the Interactive Shader Format.
Documentation 
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/*{
    "CATEGORIES": [
        "Wipe"
    ],
    "CREDIT": "Automatically converted from https://www.github.com/gl-transitions/gl-transitions/tree/master/Radial.glsl",
    "DESCRIPTION": "",
    "INPUTS": [
        {
            "NAME": "startImage",
            "TYPE": "image"
        },
        {
            "NAME": "endImage",
            "TYPE": "image"
        },
        {
            "DEFAULT": 0,
            "MAX": 1,
            "MIN": 0,
            "NAME": "progress",
            "TYPE": "float"
        },
        {
            "DEFAULT": 0.5,
            "MAX": 1,
            "MIN": 0,
            "NAME": "smoothness",
            "TYPE": "float"
        }
    ],
    "ISFVSN": "2"
}
*/



vec4 getFromColor(vec2 inUV)	{
	return IMG_NORM_PIXEL(startImage, inUV);
}
vec4 getToColor(vec2 inUV)	{
	return IMG_NORM_PIXEL(endImage, inUV);
}



// License: MIT
// Author: Xaychru
// ported by gre from https://gist.github.com/Xaychru/ce1d48f0ce00bb379750


const float PI = 3.141592653589;

vec4 transition(vec2 p) {
  vec2 rp = p*2.-1.;
  return mix(
    getToColor(p),
    getFromColor(p),
    smoothstep(0., smoothness, atan(rp.y,rp.x) - (progress-.5) * PI * 2.5)
  );
}



void main()	{
	gl_FragColor = transition(isf_FragNormCoord.xy);
}