---

/*{
	"CATEGORIES": [
		"Generator"
	],
	"DESCRIPTION": "Simple Radial Rainbow",
	"ISFVSN": "1",
	"INPUTS": [
		{
			"NAME": "center",
			"TYPE": "point2D",
			"DEFAULT": [
				411.8477,
				178.1289
			],
			"MIN": [
				0,
				0
			],
			"MAX": [
				1280,
				1024
			]
		},
		{
			"NAME": "colorCycle",
			"TYPE": "float",
			"MAX": 10,
			"DEFAULT": 0,
			"MIN": -10
		},
		{
			"NAME": "autoCycle",
			"TYPE": "bool",
			"DEFAULT": false,
			"LABEL": "Auto Cycle Colors"
		},
		{
			"NAME": "distanceScale",
			"TYPE": "float",
			"MAX": 1,
			"DEFAULT": -0.005681817,
			"MIN": -1
		},
		{
			"NAME": "modulus",
			"TYPE": "float",
			"MAX": 10,
			"DEFAULT": 0,
			"MIN": -10
		}
	],
	"CREDIT": "Eliot Lash"
}
*/

vec3 hsv2rgb(vec3 c)
{
    vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
    vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
    return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}

void main()	{
	float dist = distance(center, gl_FragCoord.xy ) * distanceScale;
	
	float hue = dist + colorCycle;

   	hue += (TIME / 2.0) * float(autoCycle);
   	
   	hue = mod(hue, modulus);
	
	gl_FragColor = vec4(hsv2rgb(vec3(hue, 1.0, 1.0)), 1.0);
}