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/*{
"CATEGORIES": [
"Geometry"
],
"CREDIT": "by VIDVOX",
"INPUTS": [
{
"DEFAULT": -0.5,
"MAX": 1,
"MIN": -1,
"NAME": "level",
"TYPE": "float"
},
{
"DEFAULT": 0.25,
"MAX": 1,
"MIN": 0,
"NAME": "radius",
"TYPE": "float"
},
{
"DEFAULT": [
0.5,
0.5
],
"MAX": [
1,
1
],
"MIN": [
0,
0
],
"NAME": "center",
"TYPE": "point2D"
},
{
"DEFAULT": [
0,
0,
0,
0
],
"NAME": "bgColor",
"TYPE": "color"
},
{
"DEFAULT": [
0.9436030983924866,
0.5601619482040405,
0,
1
],
"NAME": "lineColor",
"TYPE": "color"
},
{
"DEFAULT": 6,
"LABELS": [
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"14",
"15",
"16"
],
"NAME": "majorDivisions",
"TYPE": "long",
"VALUES": [
0,
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16
]
},
{
"DEFAULT": 2,
"LABELS": [
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
],
"NAME": "minorHDivisions",
"TYPE": "long",
"VALUES": [
0,
1,
2,
3,
4,
5,
6,
7,
8
]
},
{
"DEFAULT": 1,
"LABELS": [
"0",
"1",
"2",
"3",
"4",
"5",
"6",
"7",
"8"
],
"NAME": "minorVDivisions",
"TYPE": "long",
"VALUES": [
0,
1,
2,
3,
4,
5,
6,
7,
8
]
},
{
"DEFAULT": 3,
"MAX": 5,
"MIN": 1,
"NAME": "majorDivisionLineWidth",
"TYPE": "float"
},
{
"DEFAULT": true,
"NAME": "square",
"TYPE": "bool"
}
],
"ISFVSN": "2"
}
*/
const float minorDivisionLineWidth = 1.0;
const float pi = 3.14159265359;
#ifndef GL_ES
float distance (vec2 center, vec2 pt)
{
float tmp = pow(center.x-pt.x,2.0)+pow(center.y-pt.y,2.0);
return pow(tmp,0.5);
}
#endif
void main() {
vec2 uv = vec2(isf_FragNormCoord[0],isf_FragNormCoord[1]);
vec2 texSize = RENDERSIZE;
vec2 tc = uv * texSize;
vec2 modifiedCenter = center * RENDERSIZE;
float r = distance(modifiedCenter, tc);
float a = atan ((tc.y-modifiedCenter.y),(tc.x-modifiedCenter.x));
float radius_sized = radius * length(RENDERSIZE);
vec4 inputPixelColor = bgColor;
tc -= modifiedCenter;
if (r < radius_sized) {
float percent = 1.0-(radius_sized - r) / radius_sized;
if (level>=0.0) {
percent = percent * percent;
tc.x = r*pow(percent,level) * cos(a);
tc.y = r*pow(percent,level) * sin(a);
}
else {
float adjustedLevel = level/2.0;
tc.x = r*pow(percent,adjustedLevel) * cos(a);
tc.y = r*pow(percent,adjustedLevel) * sin(a);
}
}
tc += modifiedCenter;
vec2 loc = tc;
vec2 divisionSize = (square) ? vec2(max(RENDERSIZE.x,RENDERSIZE.y)) : RENDERSIZE;
divisionSize = (divisionSize - majorDivisionLineWidth) / (1.0 + float(majorDivisions));
vec2 modLoc = mod(loc,divisionSize);
if ((modLoc.x < majorDivisionLineWidth)||(modLoc.y < majorDivisionLineWidth)) {
inputPixelColor = lineColor;
}
if (minorHDivisions > 0) {
vec2 locDivisionSize = (divisionSize) / (1.0+float(minorHDivisions));
modLoc = mod(loc,locDivisionSize);
if (modLoc.x < minorDivisionLineWidth) {
inputPixelColor = lineColor;
}
}
if (minorVDivisions > 0) {
vec2 locDivisionSize = (divisionSize) / (1.0+float(minorVDivisions));
modLoc = mod(loc,locDivisionSize);
if (modLoc.y < minorDivisionLineWidth) {
inputPixelColor = lineColor;
}
}
gl_FragColor = inputPixelColor;
}