/*{
"DESCRIPTION": "Masks an image based on the amount of motion",
"CREDIT": "by VIDVOX",
"ISFVSN": "2",
"CATEGORIES": [
"Masking"
],
"INPUTS": [
{
"NAME": "inputImage",
"TYPE": "image"
},
{
"LABEL": "Threshold",
"NAME": "threshold",
"TYPE": "float",
"MIN": 0.0,
"MAX": 1.0,
"DEFAULT": 0.25
},
{
"LABEL": "Persistence",
"NAME": "persistence",
"TYPE": "float",
"MIN": 0.9,
"MAX": 1.0,
"DEFAULT": 0.95
},
{
"LABEL": "Reset BG",
"NAME": "updateBackground",
"TYPE": "event"
},
{
"LABEL": "Dilate",
"NAME": "dilate",
"TYPE": "float",
"MIN": 0.0,
"MAX": 6.0,
"DEFAULT": 0.0
},
{
"LABEL": "Blur",
"NAME": "blur",
"TYPE": "float",
"MIN": 0.0,
"MAX": 6.0,
"DEFAULT": 0.0
},
{
"LABEL": "Output Mask",
"NAME": "showAlpha",
"TYPE": "bool",
"DEFAULT": false
},
{
"LABEL": "Hard Cutoff",
"NAME": "applyCutOff",
"TYPE": "bool",
"DEFAULT": true
}
],
"PASSES": [
{
"TARGET":"freezeBuffer",
"PERSISTENT": true
},
{
"TARGET":"mask"
},
{
"TARGET": "horizDilate"
},
{
"TARGET": "vertDilate"
},
{
"TARGET": "horizBlur"
},
{
"TARGET": "vertBlur"
},
{
}
]
}*/
// Essentially the same as a feedback buffer where you can only set it to a mix of 1.0
void main()
{
vec2 tmpCoord;
float maxAlpha;
vec4 sampleColorRGB;
vec4 src_rgb;
if (PASSINDEX==0) {
vec4 srcPixel = IMG_THIS_PIXEL(inputImage);
vec4 oldPixel = IMG_THIS_PIXEL(freezeBuffer);
gl_FragColor = (updateBackground) ? srcPixel : mix(srcPixel,oldPixel,persistence);
}
else if (PASSINDEX==1) {
vec4 srcPixel = IMG_THIS_PIXEL(inputImage);
vec4 oldPixel = IMG_THIS_PIXEL(freezeBuffer);
vec4 resultPixel = vec4(0.0);
float difference = abs(srcPixel.r - oldPixel.r) + abs(srcPixel.g - oldPixel.g) + abs(srcPixel.b - oldPixel.b);
resultPixel = vec4(difference);
gl_FragColor = resultPixel;
}
else if (PASSINDEX==2) {
// 'dilate' samples on either side + the source pixel = 2*dilate+1 total samples
for (float i=0.; i<=dilate; ++i) {
tmpCoord = vec2(clamp(gl_FragCoord.x+i,0.,RENDERSIZE.x), gl_FragCoord.y);
sampleColorRGB = IMG_PIXEL(mask, 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(mask, tmpCoord);
if (sampleColorRGB.a < maxAlpha) {
maxAlpha = sampleColorRGB.a;
}
}
}
gl_FragColor = vec4(src_rgb.rgb, maxAlpha);
}
else if (PASSINDEX==3) {
// 'dilate' samples up and down + the source pixel = 2*dilate+1 total samples
for (float i=0.; i<=float(int(dilate)); ++i) {
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==4) {
float tmpRadius = float(int(blur));
vec4 tmpColor;
vec4 srcColor;
float totalAlpha = 0.0;
for (float i=-1.*tmpRadius; i<=tmpRadius; ++i) {
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==5) {
float tmpRadius = float(int(blur));
vec4 tmpColor;
vec4 srcColor;
float totalAlpha = 0.0;
for (float i=-1.*tmpRadius; i<=tmpRadius; ++i) {
tmpColor = IMG_PIXEL(horizBlur, gl_FragCoord.xy+vec2(0.0,i));
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==6) {
vec4 srcPixel = IMG_THIS_PIXEL(inputImage);
vec4 oldPixel = IMG_THIS_PIXEL(vertBlur);
vec4 resultPixel = vec4(0.0);
float difference = oldPixel.a;
if (difference > threshold) {
if (showAlpha)
resultPixel = vec4(1.0,1.0,1.0,1.0);
else
resultPixel = srcPixel;
if (!applyCutOff)
resultPixel = resultPixel * difference;
}
gl_FragColor = resultPixel;
}
}
