/*{ "CREDIT": "by VIDVOX", "CATEGORIES": [ "Color Effect", "Masking" ], "INPUTS": [ { "NAME": "inputImage", "TYPE": "image" }, { "LABEL": "Master Threshold", "NAME": "threshold", "TYPE": "float", "MIN": 0, "MAX": 1, "DEFAULT": 0.5 }, { "LABEL": "Key Color", "NAME": "mask_color", "TYPE": "color", "DEFAULT": [ 0.24, 0.77, 0.38, 1 ] }, { "LABEL": "HUE- Tol.", "NAME": "hueTol", "TYPE": "float", "MIN": 0, "MAX": 0.25, "DEFAULT": 0 }, { "LABEL": "HUE- Min. Bracket", "NAME": "hueMinBracket", "TYPE": "float", "MIN": 0, "MAX": 0.5, "DEFAULT": 0.25 }, { "LABEL": "HUE- Max Bracket", "NAME": "hueMaxBracket", "TYPE": "float", "MIN": 0, "MAX": 0.5, "DEFAULT": 0.25 }, { "LABEL": "SAT- Tol.", "NAME": "satTol", "TYPE": "float", "MIN": 0, "MAX": 0.5, "DEFAULT": 0 }, { "LABEL": "SAT- Min. Bracket", "NAME": "satMinBracket", "TYPE": "float", "MIN": 0, "MAX": 1, "DEFAULT": 0.5 }, { "LABEL": "SAT- Max Bracket", "NAME": "satMaxBracket", "TYPE": "float", "MIN": 0, "MAX": 1, "DEFAULT": 0.5 }, { "LABEL": "VAL- Tol.", "NAME": "valTol", "TYPE": "float", "MIN": 0, "MAX": 0.5, "DEFAULT": 0 }, { "LABEL": "VAL- Min. Bracket", "NAME": "valMinBracket", "TYPE": "float", "MIN": 0, "MAX": 1, "DEFAULT": 0.5 }, { "LABEL": "VAL- Max Bracket", "NAME": "valMaxBracket", "TYPE": "float", "MIN": 0, "MAX": 1, "DEFAULT": 0.5 }, { "LABEL": "Dilate", "NAME": "dilate", "TYPE": "float", "MIN": 0, "MAX": 6, "DEFAULT": 0 }, { "LABEL": "Blur", "NAME": "blur", "TYPE": "float", "MIN": 0, "MAX": 6, "DEFAULT": 0 } ], "PASSES": [ { "TARGET": "alphaPass" }, { "TARGET": "horizDilate" }, { "TARGET": "vertDilate" }, { "TARGET": "horizBlur" }, { "TARGET": "vertBlur" } ] }*/ vec3 rgb2hsv(vec3 c); vec3 hsv2rgb(vec3 c); void main() { // generally speaking, sample a bunch of pixels, for each sample convert color val to HSV, if luma is greater than max luma, that's the new color vec2 tmpCoord; float maxAlpha; vec4 sampleColorRGB; vec4 src_rgb; if (PASSINDEX==0) { // the goal is to calculate a new float value for the alpha channel, and/or desaturate the color, if this pixel is "close" to the mask color // get the src pixel's color (as RGB), convert to HSV values src_rgb = IMG_PIXEL(inputImage, gl_FragCoord.xy); vec3 src_hsl = rgb2hsv(src_rgb.rgb); // convert the passed color (which is RGB) to HSV values vec3 color_hsl = rgb2hsv(mask_color.rgb); /* -minBracket -tolerance color_hsl +tolerance +maxBracket | | | | | val being examined ---------------------------------------------------------------- | | | alpha 1.0 0.0 1.0 */ float hueAlpha; float satAlpha; float valAlpha; // use a 'for' loop to generate the hue/sat/val alpha values int i = 0; float source; float color; float tolerance; vec2 bracket; float alpha; float minVal; float maxVal; for (float i=0.0; i<3.0; ++i) { source = src_hsl[int(i)]; color = color_hsl[int(i)]; if (i==0.0) { tolerance = hueTol; bracket = vec2(hueMinBracket, hueMaxBracket); } else if (i==1.0) { tolerance = satTol; bracket = vec2(satMinBracket, satMaxBracket); } else if (i==2.0) { tolerance = valTol; bracket = vec2(valMinBracket, valMaxBracket); } // if the source sat is < the mask color sat if (source < color) { // the min is the bracket and tolerance, the max is the mask color minVal = color - tolerance - bracket.x; maxVal = color; // as i go from min to max, the alpha goes from 1 to 0 alpha = 1.0 - smoothstep(minVal, maxVal, source); } // else if the source sat is > the mask color sat else if (source > color) { // the min is the mask color, the max is the tolerance and bracket minVal = color; maxVal = color + tolerance + bracket.y; // as i go from min to max, the alpha goes from 0 to 1 alpha = smoothstep(minVal, maxVal, source); } // else the source sat == the mask color sat, the alpha should be 0 else alpha = 0.0; if (i==0.0) { hueAlpha = alpha; } else if (i==1.0) { satAlpha = alpha; } else if (i==2.0) { valAlpha = alpha; } } // calculate the alpha i'll be applying src_rgb.a = sqrt(max(hueAlpha,max(satAlpha, valAlpha))); // desaturate the color if appropriate, use the desaturated color if (hueAlpha < 1.0) { //src_hsl.y = 0.0; src_hsl.y = mix(0.0, src_hsl.y, hueAlpha); src_rgb.rgb = hsv2rgb(src_hsl.xyz); } gl_FragColor = src_rgb; //gl_FragColor = vec4(src_rgb.a, src_rgb.a, src_rgb.a, 1.0); } else if (PASSINDEX==1) { // 'dilate' samples on either side + the source pixel = 2*dilate+1 total samples for (float i=0.; i<6.0; ++i) { if (i > float(int(dilate))) { break; } tmpCoord = vec2(clamp(gl_FragCoord.x+i,0.,RENDERSIZE.x), gl_FragCoord.y); sampleColorRGB = IMG_PIXEL(alphaPass, tmpCoord); // if this is the first sample for this fragment, don't bother comparing- just set the max luma stuff if (i == 0.) { maxAlpha = sampleColorRGB.a; src_rgb = sampleColorRGB; } // else this isn't the first sample... else { // compare, determine if it's the max luma if (sampleColorRGB.a < maxAlpha) { maxAlpha = sampleColorRGB.a; } // do another sample for the negative coordinate tmpCoord = vec2(clamp(gl_FragCoord.x-i,0.,RENDERSIZE.x), gl_FragCoord.y); sampleColorRGB = IMG_PIXEL(alphaPass, tmpCoord); if (sampleColorRGB.a < maxAlpha) { maxAlpha = sampleColorRGB.a; } } } gl_FragColor = vec4(src_rgb.rgb, maxAlpha); } else if (PASSINDEX==2) { // 'dilate' samples up and down + the source pixel = 2*dilate+1 total samples for (float i=0.; i<=6.0; ++i) { if (i > float(int(dilate))) { break; } tmpCoord = vec2(gl_FragCoord.x, clamp(gl_FragCoord.y+i,0.,RENDERSIZE.y)); sampleColorRGB = IMG_PIXEL(horizDilate, tmpCoord); // if this is the first sample for this fragment, don't bother comparing- just set the max luma stuff if (i == 0.) { maxAlpha = sampleColorRGB.a; src_rgb = sampleColorRGB; } // else this isn't the first sample... else { // compare, determine if it's the max luma if (sampleColorRGB.a < maxAlpha) { maxAlpha = sampleColorRGB.a; } // do another sample for the negative coordinate tmpCoord = vec2(gl_FragCoord.x, clamp(gl_FragCoord.y-i,0.,RENDERSIZE.y)); sampleColorRGB = IMG_PIXEL(horizDilate, tmpCoord); if (sampleColorRGB.a < maxAlpha) { maxAlpha = sampleColorRGB.a; } } } gl_FragColor = vec4(src_rgb.rgb, maxAlpha); } else if (PASSINDEX==3) { float tmpRadius = float(int(blur)); vec4 tmpColor; vec4 srcColor; float totalAlpha = 0.0; for (float i=-6.0; i<=6.0; ++i) { if (i > tmpRadius) { break; } if (i > -1.*tmpRadius) { tmpColor = IMG_PIXEL(vertDilate, gl_FragCoord.xy+vec2(i,0.0)); totalAlpha += tmpColor.a; if (i==0.0) srcColor = tmpColor; } } totalAlpha /= ((tmpRadius*2.)+1.); gl_FragColor = vec4(srcColor.r, srcColor.g, srcColor.b, totalAlpha); } else if (PASSINDEX==4) { float tmpRadius = float(int(blur)); vec4 tmpColor; vec4 srcColor; float totalAlpha = 0.0; for (float i=-6.0; i<=6.0; ++i) { if (i > tmpRadius) { break; } if (i > -1.*tmpRadius) { tmpColor = IMG_PIXEL(horizBlur, gl_FragCoord.xy+vec2(0.0,i)); totalAlpha += tmpColor.a; if (i==0.0) srcColor = tmpColor; } } totalAlpha /= ((tmpRadius*2.)+1.); if (totalAlpha > threshold) { srcColor = IMG_PIXEL(inputImage,gl_FragCoord.xy); float gray = (srcColor.r + srcColor.g + srcColor.b) / 3.0; gl_FragColor = vec4(gray, gray, gray, srcColor.a); } else gl_FragColor = IMG_PIXEL(inputImage,gl_FragCoord.xy); } } vec3 rgb2hsv(vec3 c) { vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0); //vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g)); //vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r)); vec4 p = c.g < c.b ? vec4(c.bg, K.wz) : vec4(c.gb, K.xy); vec4 q = c.r < p.x ? vec4(p.xyw, c.r) : vec4(c.r, p.yzx); float d = q.x - min(q.w, q.y); float e = 1.0e-10; return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x); } 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); }