uniform float time;
uniform float seed;
uniform vec2 resolution;
uniform vec2 cursor;
uniform vec2 scroll;
uniform float transition;
float border=.1;
float gridSize=100.;
vec4 bgColor=vec4(vec3(.01),1.);
vec4 outerBgColor=vec4(vec3(.001),1.);
vec4 dotColor=vec4(vec3(.7),1.);
vec4 outerDotColor=vec4(vec3(.001),1.);
vec3 hash(vec3 p){
p=vec3(dot(p,vec3(127.1,311.7,74.7)),
dot(p,vec3(269.5,183.3,246.1)),
dot(p,vec3(113.5,271.9,124.6)));
return-1.+2.*fract(sin(p)*43758.5453123);
}
float noise(in vec3 p){
vec3 i=floor(p);
vec3 f=fract(p);
vec3 u=f*f*(3.-2.*f);
return mix(mix(mix(dot(hash(i+vec3(0.,0.,0.)),f-vec3(0.,0.,0.)),
dot(hash(i+vec3(1.,0.,0.)),f-vec3(1.,0.,0.)),u.x),
mix(dot(hash(i+vec3(0.,1.,0.)),f-vec3(0.,1.,0.)),
dot(hash(i+vec3(1.,1.,0.)),f-vec3(1.,1.,0.)),u.x),u.y),
mix(mix(dot(hash(i+vec3(0.,0.,1.)),f-vec3(0.,0.,1.)),
dot(hash(i+vec3(1.,0.,1.)),f-vec3(1.,0.,1.)),u.x),
mix(dot(hash(i+vec3(0.,1.,1.)),f-vec3(0.,1.,1.)),
dot(hash(i+vec3(1.,1.,1.)),f-vec3(1.,1.,1.)),u.x),u.y),u.z);
}
float sdBox(in vec2 p,in vec2 b){
vec2 d=abs(p)-b;
return length(max(d,0.))+min(max(d.x,d.y),0.);
}
void sun(inout vec4 col,inout vec2 uv,in vec2 gUv){
float dist=sqrt(pow(uv.x,2.)+pow(uv.y,2.));
float nO=step(dist,.3);
float nBB=step(sdBox(gUv,vec2(1.)),0.);
col=mix(col,bgColor,nBB);
col=mix(col,outerBgColor,(nBB*-1.+1.));
col=mix(col,dotColor,nO*nBB);
col=mix(col,outerDotColor,nO*(nBB*-1.+1.));
}
void magnify(inout vec4 col,inout vec2 uv){
float aspect=min(resolution.y/resolution.x,1.);
vec2 center=vec2(.5);
vec2 c=cursor/resolution.x*aspect;
center+=(c-.5)*vec2(.1,-.1);
float dx=(uv.x-center.x)/(resolution.x*.5);
float dy=(uv.y-center.y)/(resolution.x*.5);
float mag=pow(clamp(1.-sqrt(pow(dx,2.)+pow(dy,2.)),.0,1.),5.);
uv.x-=dx*mag*2.;
uv.y-=dy*mag*2.;
col=mix(col,vec4(1.),0.);
}
void main(){
float aspect=min(resolution.y/resolution.x,1.);
vec4 col=bgColor;
vec2 uv=gl_FragCoord.xy;
uv-=resolution*.5;
uv/=resolution.x*aspect*.35;
uv+=vec2(noise(vec3(uv,time*.5)*.3),noise(vec3(uv,time*.5))*.3);
vec2 gUv=floor(uv*gridSize)/gridSize;
uv=fract(uv*gridSize)-vec2(.5);
sun(col,uv,gUv);
gl_FragColor=col;
}
