---

/*{
	"CATEGORIES": [
		"Distortion Effect"
	],
	"CREDIT": "carter rosenberg",
	"DESCRIPTION": null,
	"INPUTS": [
		{
			"NAME": "inputImage",
			"TYPE": "image"
		},
		{
			"DEFAULT": 1,
			"MAX": 32,
			"MIN": 0.1,
			"NAME": "level",
			"TYPE": "float"
		},
		{
			"DEFAULT": 0,
			"MAX": 1,
			"MIN": 0,
			"NAME": "offset",
			"TYPE": "float"
		},
		{
			"DEFAULT": 0,
			"MAX": 1,
			"MIN": 0,
			"NAME": "x_smear",
			"TYPE": "float"
		},
		{
			"DEFAULT": 0,
			"MAX": 1,
			"MIN": 0.01,
			"NAME": "y_smear",
			"TYPE": "float"
		},
		{
			"DEFAULT": [
				0.5,
				0.5
			],
			"MAX": [
				1,
				1
			],
			"MIN": [
				0,
				0
			],
			"NAME": "center",
			"TYPE": "point2D"
		},
		{
			"DEFAULT": 0,
			"LABELS": [
				"Single",
				"Double"
			],
			"NAME": "mode",
			"TYPE": "long",
			"VALUES": [
				0,
				1
			]
		},
		{
			"TYPE":"float",
			"NAME":"repeatStyle"
		},
		{
			"TYPE":"float",
			"NAME":"radius"
		}
	],
	"ISFVSN": "2",
	"VSN": null
}
*/

const float pi = 3.14159265359;

#ifndef GL_ES
float distance (vec2 inCenter, vec2 pt)
{
float tmp = pow(inCenter.x-pt.x,2.0)+pow(inCenter.y-pt.y,2.0);
	return pow(tmp,0.5);
}
#endif

float circle(in vec2 center, in float lRadius, in float blur){
	float aspect = RENDERSIZE.x / RENDERSIZE.y;
	vec2 pixel = isf_FragNormCoord.xy;
    vec2 dist = pixel - center;
   	dist.y /= aspect * 0.5 * 2.0;

	return 1.-smoothstep( lRadius - ( lRadius * blur ),
                         lRadius + ( lRadius * blur ),
                         dot( dist, dist ) * 4.0 );
}

void main() {
	
	/*
	vec2		loc = gl_FragCoord.xy;
	vec2		locCenter = feedbackCenter * RENDERSIZE;
	float		scaledRadius = maskRadius * min(RENDERSIZE.x,RENDERSIZE.y);
	float		dist = distance(locCenter,loc);
	dist>scaledRadius
	*/
	
	vec2 uv = isf_FragNormCoord.xy;
	vec2 texSize = RENDERSIZE;
	vec2 tc = uv * texSize;
	vec2 modifiedCenter = center * RENDERSIZE;
	float scaledRadius = radius * min(RENDERSIZE.x,RENDERSIZE.y);
	float r = distance(modifiedCenter, tc);
	float a = atan((tc.y-modifiedCenter.y),(tc.x-modifiedCenter.x));
	//float render_length = length(RENDERSIZE);
	//float radius_sized = clamp(radius * render_length, 1.0, render_length);
	float radius_sized = radius * length(RENDERSIZE);

	tc -= modifiedCenter;
    gl_FragColor = vec4(0.0);
	if (r<scaledRadius) 	{
		float percent = 1.0-(radius_sized - r) / radius_sized;
		float adjustedOffset = offset * 2.0 * pi;

		tc.x = r*(1.0+sin(percent * level * 2.0 * pi + adjustedOffset))/2.0 * cos(a);
		tc.y = r*(1.0+sin(percent * level * 2.0 * pi + adjustedOffset))/2.0 * sin(a);
		tc.x = mix(uv.x, tc.x, max(1.0-x_smear,0.001));
		tc.y = mix(uv.y, tc.y, max(1.0-y_smear,0.001));
	} else {
		gl_FragColor = vec4(0.0);
	}
	tc += modifiedCenter;
	vec2 loc = tc / texSize;
	gl_FragColor = IMG_NORM_PIXEL(inputImage, loc);
}