/*{
"CATEGORIES": [
"Drawing"
],
"DESCRIPTION": "",
"INPUTS": [
{
"DEFAULT": [
0,
0
],
"MAX": [
1,
1
],
"MIN": [
0,
0
],
"NAME": "pointInput",
"TYPE": "point2D"
},
{
"DEFAULT": [
0.9596965909004211,
0.5817266273340564,
0.17662368847084817,
1
],
"NAME": "startColor",
"TYPE": "color"
},
{
"DEFAULT": [
0.9623754620552063,
0.9023552320837249,
0.28796788144265206,
1
],
"NAME": "endColor",
"TYPE": "color"
},
{
"DEFAULT": 0.1,
"MAX": 0.5,
"MIN": 0,
"NAME": "startSize",
"TYPE": "float"
},
{
"DEFAULT": 0,
"MAX": 0.5,
"MIN": 0,
"NAME": "endSize",
"TYPE": "float"
},
{
"DEFAULT": 16,
"MAX": 32,
"MIN": 1,
"NAME": "trailCount",
"TYPE": "float"
},
{
"DEFAULT": 0,
"MAX": 0.1,
"MIN": 0,
"NAME": "strokeSize",
"TYPE": "float"
},
{
"DEFAULT": [
0,
0,
0,
1
],
"NAME": "strokeColor",
"TYPE": "color"
}
],
"ISFVSN": "2",
"PASSES": [
{
"HEIGHT": "1",
"PERSISTENT": true,
"TARGET": "pointsBuffer",
"WIDTH": "$trailCount"
},
{
"DESCRIPTION": "this empty pass is rendered at the same rez as whatever you are running the ISF filter at- the previous step rendered an image at one-sixteenth the res, so this step ensures that the output is full-size"
}
],
"VSN": ""
}
*/
float drawCircle(vec2 pt, vec2 circlePosition, float circleSize){
if (distance(pt, circlePosition)<circleSize){
return distance(pt, circlePosition) / circleSize;
}
return 0.0;
}
void main() {
vec4 returnMe = vec4(0.0);
if (PASSINDEX == 0) {
vec2 loc = isf_FragNormCoord.xy;
float val = 1.0 / floor(trailCount);
if (loc.x < val) {
returnMe = vec4(pointInput.x,pointInput.y,1.0,1.0);
}
else {
loc.x = loc.x - val;
returnMe = IMG_NORM_PIXEL(pointsBuffer,loc);
}
}
else if (PASSINDEX == 1) {
float inCircle = 0.0;
float aspectRatio = RENDERSIZE.x / RENDERSIZE.y;
vec2 loc = isf_FragNormCoord * aspectRatio;
float trailFloor = floor(trailCount);
int j = 0;
float val = 1.0 / (trailFloor-1.0);
for (int i = 0;i < 32;++i) {
float cSize = mix(startSize,endSize,float(i)/trailFloor);
vec2 pos = vec2(float(i)*val,0.5);
vec4 ptInfo = IMG_NORM_PIXEL(pointsBuffer,pos);
if (ptInfo.g > 0.0)
inCircle += drawCircle(loc,ptInfo.xy*aspectRatio,cSize);
if (inCircle > 0.0) {
//inCircle = 1.0;
j = i;
break;
}
if (i == int(trailCount)) {
j = i;
break;
}
}
if (inCircle > 0.0) {
returnMe = mix(startColor,endColor,float(j)/floor(trailCount));
if ((strokeSize > 0.0)&&(inCircle > 1.0 - strokeSize)) {
returnMe = strokeColor;
}
}
}
gl_FragColor = returnMe;
}
