isf 0.1.0

Parsing, Deserialization and Serialization of the Interactive Shader Format.
Documentation 
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/*{
    "CATEGORIES": [
        "Color Effect"
    ],
    "CREDIT": "by VIDVOX",
    "INPUTS": [
        {
            "NAME": "inputImage",
            "TYPE": "image"
        },
        {
            "DEFAULT": 0,
            "MAX": 1,
            "MIN": -1,
            "NAME": "intensity",
            "TYPE": "float"
        }
    ],
    "ISFVSN": "2",
    "PASSES": [
        {
            "TARGET": "pass1"
        },
        {
            "TARGET": "pass2"
        },
        {
            "TARGET": "pass3"
        }
    ]
}
*/

#if __VERSION__ <= 120
varying vec2 left_coord;
varying vec2 right_coord;
varying vec2 above_coord;
varying vec2 below_coord;

varying vec2 lefta_coord;
varying vec2 righta_coord;
varying vec2 leftb_coord;
varying vec2 rightb_coord;
#else
in vec2 left_coord;
in vec2 right_coord;
in vec2 above_coord;
in vec2 below_coord;

in vec2 lefta_coord;
in vec2 righta_coord;
in vec2 leftb_coord;
in vec2 rightb_coord;
#endif

float gray(vec4 n)
{
	return (n.r + n.g + n.b)/3.0;
}

void main()
{
	vec4 final = vec4(0.0);
	
	if (PASSINDEX == 0)	{
		vec4 color = IMG_THIS_PIXEL(inputImage);
		vec4 colorL = (IMG_NORM_PIXEL(inputImage, left_coord));
		vec4 colorR = (IMG_NORM_PIXEL(inputImage, right_coord));
		vec4 colorA = (IMG_NORM_PIXEL(inputImage, above_coord));
		vec4 colorB = (IMG_NORM_PIXEL(inputImage, below_coord));

		vec4 colorLA = (IMG_NORM_PIXEL(inputImage, lefta_coord));
		vec4 colorRA = (IMG_NORM_PIXEL(inputImage, righta_coord));
		vec4 colorLB = (IMG_NORM_PIXEL(inputImage, leftb_coord));
		vec4 colorRB = (IMG_NORM_PIXEL(inputImage, rightb_coord));
		
		final = color - color * intensity * (8.0*gray(color) - colorL - colorR - colorA - colorB - colorLA - colorRA - colorLB - colorRB);
		final.a = color.a;
	}
	else if (PASSINDEX == 1)	{
		vec4 color = IMG_THIS_PIXEL(pass1);
		vec4 colorL = (IMG_NORM_PIXEL(pass1, left_coord));
		vec4 colorR = (IMG_NORM_PIXEL(pass1, right_coord));
		vec4 colorA = (IMG_NORM_PIXEL(pass1, above_coord));
		vec4 colorB = (IMG_NORM_PIXEL(pass1, below_coord));

		vec4 colorLA = (IMG_NORM_PIXEL(pass1, lefta_coord));
		vec4 colorRA = (IMG_NORM_PIXEL(pass1, righta_coord));
		vec4 colorLB = (IMG_NORM_PIXEL(pass1, leftb_coord));
		vec4 colorRB = (IMG_NORM_PIXEL(pass1, rightb_coord));
		
		final = (1.0 - abs(intensity)) * color + abs(intensity) * (colorL + colorR + colorA + colorB + colorLA + colorRA + colorLB + colorRB) / 8.0;
		final.a = color.a;
	}
	else if (PASSINDEX == 2)	{
		vec4 color = IMG_THIS_PIXEL(pass2);
		vec4 colorL = (IMG_NORM_PIXEL(pass2, left_coord));
		vec4 colorR = (IMG_NORM_PIXEL(pass2, right_coord));
		vec4 colorA = (IMG_NORM_PIXEL(pass2, above_coord));
		vec4 colorB = (IMG_NORM_PIXEL(pass2, below_coord));

		vec4 colorLA = (IMG_NORM_PIXEL(pass2, lefta_coord));
		vec4 colorRA = (IMG_NORM_PIXEL(pass2, righta_coord));
		vec4 colorLB = (IMG_NORM_PIXEL(pass2, leftb_coord));
		vec4 colorRB = (IMG_NORM_PIXEL(pass2, rightb_coord));
		
		final = color - color * intensity * (8.0*gray(color) - colorL - colorR - colorA - colorB - colorLA - colorRA - colorLB - colorRB);
		final.a = color.a;
	}
	
	
	
	gl_FragColor = final;
}