---

/*{
	"CATEGORIES": [
		"Generators"
	],
	"DESCRIPTION": "Gradients",
	"ISFVSN": "2",
	"VSN": ".01",
	"INPUTS": [
		{
			"NAME": "circle_size",
			"TYPE": "float",
			"MAX": 10,
			"DEFAULT": 1.5922174453735352,
			"MIN": 0
		},
		{
			"NAME": "fill_color",
			"TYPE": "color",
			"DEFAULT": [
				0.9475757479667664,
				0.13316583633422852,
				0.18496136367321014,
				1
			]
		},
		{
			"NAME": "grad_color",
			"TYPE": "color",
			"DEFAULT": [
				0.9953651428222656,
				0.8341365456581116,
				0,
				1
			]
		}
	],
	"CREDIT": "@colin_movecraft"
}
*/

float makeDist(vec2 screenSpace, float multiplier){
return length(screenSpace*multiplier);
}

mat2 scale(vec2 _scale){
    return mat2(_scale.x,0.0,
                0.0,_scale.y);
}

vec4 ellipseGrad( vec2 screenSpace, float radius, vec3 gradColor, vec3 fillColor ){

	screenSpace = scale( vec2(radius) ) * screenSpace;

	vec4 color = vec4(0.0,0.0,0.0,1.0);

	float gradDist = makeDist(screenSpace , 1.75  );
	float solidDist = makeDist(screenSpace, 1.0);

	float gradSDF = 1.0-pow( gradDist , 3.0 );
	float solidSDF = 1.0-smoothstep( .495,.5 , solidDist );

	vec3 grad = vec3( gradSDF ) * gradColor;
	vec3 solid = vec3( solidSDF ) * fillColor;

	color.rgb += grad;

	color.a -= max(1.0-gradSDF,0.0);

	color.a += solidSDF;
	color.rgb = 1.0-vec3(solidSDF);

	color.rgb *= grad;
	color.rgb += solid;

	return color;
}



void main(){

	vec4 color = vec4(0.1,0.2,0.1,1.0);
	vec2 screenSpace = (isf_FragNormCoord.xy);
	screenSpace -=.5;
	screenSpace.x *= (RENDERSIZE.x/RENDERSIZE.y);

	color += ellipseGrad( screenSpace, circle_size, grad_color.rgb, fill_color.rgb);

		color += ellipseGrad( screenSpace+vec2(cos(TIME)*.1,sin(TIME+3.14)*.1), circle_size, grad_color.rgb, fill_color.rgb);
		color += ellipseGrad( screenSpace-vec2(cos(TIME)*.1,sin(TIME+3.14)*.1), circle_size, grad_color.rgb, fill_color.rgb);
		color += ellipseGrad( screenSpace-vec2(cos(TIME)*.1,sin(TIME)*.1), circle_size, grad_color.rgb, fill_color.rgb);

	color.a = 1.0;

	gl_FragColor = vec4(color);
}