---

/*{
	"CATEGORIES": [
		"Color Effect"
	],
	"DESCRIPTION": "Tints the corners of the image in different colors.",
	"ISFVSN": "2",
	"INPUTS": [
		{
			"NAME": "inputImage",
			"TYPE": "image"
		},
		{
			"NAME": "color1",
			"TYPE": "color",
			"DEFAULT": [
				1,
				0,
				0,
				1
			]
		},
		{
			"NAME": "color2",
			"TYPE": "color",
			"DEFAULT": [
				0,
				1,
				0,
				1
			]
		},
		{
			"NAME": "color3",
			"TYPE": "color",
			"DEFAULT": [
				0,
				0,
				1,
				1
			]
		},
		{
			"NAME": "color4",
			"TYPE": "color",
			"DEFAULT": [
				1,
				1,
				1,
				1
			]
		},
		{
			"NAME": "rotationAngle",
			"TYPE": "float",
			"MAX": 1,
			"DEFAULT": 0,
			"MIN": 0
		}
	],
	"CREDIT": "VIDVOX"
}
*/

const float pi = 3.1415926535897932384626433832795;

vec2 rotatePointNorm(vec2 pt, float rot){
	vec2 returnMe = pt;

	float r = distance(vec2(0.50), returnMe);
	float a = atan((returnMe.y-0.5),(returnMe.x-0.5));

	returnMe.x = r * cos(a + 2.0 * pi * rot - pi) + 0.5;
	returnMe.y = r * sin(a + 2.0 * pi * rot - pi) + 0.5;

	returnMe = returnMe;

	return returnMe;
}

void main()	{
	vec2		pt = (isf_FragNormCoord.xy);
	vec4		srcPixel = IMG_NORM_PIXEL(inputImage,pt);
	vec4		dist = vec4(0.0);
	pt = rotatePointNorm(pt,rotationAngle+0.5);
	dist.r = max(1.0-distance(vec2(0.0,0.0),pt),0.0);
	dist.g = max(1.0-distance(vec2(1.0,0.0),pt),0.0);
	dist.b = max(1.0-distance(vec2(0.0,1.0),pt),0.0);
	dist.a = max(1.0-distance(vec2(1.0,1.0),pt),0.0);

	float		luma1 = (srcPixel.r+srcPixel.g+srcPixel.b)/3.0;
	vec4		resultPixel = (color1 * dist.r + color2 * dist.g + color3 * dist.b + color4 * dist.a) / (dist.r + dist.g + dist.b + dist.a);
	float		luma2 = (resultPixel.r+resultPixel.g+resultPixel.b)/3.0;
	resultPixel.rgb *= luma1 / luma2;
	resultPixel.a *= srcPixel.a;

	gl_FragColor = resultPixel;
}