175 lines
4.3 KiB
GLSL
Executable File
175 lines
4.3 KiB
GLSL
Executable File
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
|
|
uniform float time;
|
|
uniform vec2 mouse;
|
|
uniform vec2 resolution;
|
|
|
|
|
|
#define iterations 14
|
|
#define formuparam2 0.79
|
|
|
|
#define volsteps 5
|
|
#define stepsize 0.290
|
|
|
|
#define zoom 0.900
|
|
#define tile 0.850
|
|
#define speed2 0.10
|
|
|
|
#define brightness 0.003
|
|
#define darkmatter 0.400
|
|
#define distfading 0.560
|
|
#define saturation 0.800
|
|
|
|
|
|
#define transverseSpeed zoom*2.0
|
|
#define cloud 0.11
|
|
|
|
|
|
float triangle(float x, float a) {
|
|
float output2 = 2.0*abs( 2.0* ( (x/a) - floor( (x/a) + 0.5) ) ) - 1.0;
|
|
return output2;
|
|
}
|
|
|
|
float field(in vec3 p) {
|
|
float strength = 7. + .03 * log(1.e-6 + fract(sin(time) * 4373.11));
|
|
float accum = 0.;
|
|
float prev = 0.;
|
|
float tw = 0.;
|
|
|
|
for (int i = 0; i < 6; ++i) {
|
|
float mag = dot(p, p);
|
|
p = abs(p) / mag + vec3(-.5, -.8 + 0.1*sin(time*0.7 + 2.0), -1.1+0.3*cos(time*0.3));
|
|
float w = exp(-float(i) / 7.);
|
|
accum += w * exp(-strength * pow(abs(mag - prev), 2.3));
|
|
tw += w;
|
|
prev = mag;
|
|
}
|
|
return max(0., 5. * accum / tw - .7);
|
|
}
|
|
|
|
|
|
|
|
void main() {
|
|
vec2 uv2 = 2. * gl_FragCoord.xy / vec2(512) - 1.;
|
|
vec2 uvs = uv2 * vec2(512) / 512.;
|
|
|
|
float time2 = time;
|
|
float speed = speed2;
|
|
speed = .01 * cos(time2*0.002 + 3.1415926/4.0);
|
|
//speed = 0.0;
|
|
float formuparam = formuparam2;
|
|
|
|
//get coords and direction
|
|
vec2 uv = uvs;
|
|
//mouse rotation
|
|
float a_xz = 0.9;
|
|
float a_yz = -.6;
|
|
float a_xy = 0.9 + time*0.08;
|
|
|
|
mat2 rot_xz = mat2(cos(a_xz),sin(a_xz),-sin(a_xz),cos(a_xz));
|
|
mat2 rot_yz = mat2(cos(a_yz),sin(a_yz),-sin(a_yz),cos(a_yz));
|
|
mat2 rot_xy = mat2(cos(a_xy),sin(a_xy),-sin(a_xy),cos(a_xy));
|
|
|
|
|
|
float v2 =1.0;
|
|
vec3 dir=vec3(uv*zoom,1.);
|
|
vec3 from=vec3(0.0, 0.0,0.0);
|
|
from.x -= 1.;
|
|
from.y -= 1.;
|
|
|
|
|
|
vec3 forward = vec3(0.,0.,1.);
|
|
from.x += transverseSpeed*(1.0)*cos(0.001*time);
|
|
from.y += transverseSpeed*(1.0)*sin(0.001*time);
|
|
from.z += 0.003*time;
|
|
|
|
dir.xy*=rot_xy;
|
|
forward.xy *= rot_xy;
|
|
dir.xz*=rot_xz;
|
|
forward.xz *= rot_xz;
|
|
dir.yz*= rot_yz;
|
|
forward.yz *= rot_yz;
|
|
|
|
from.xy*=-rot_xy;
|
|
from.xz*=rot_xz;
|
|
from.yz*= rot_yz;
|
|
|
|
|
|
//zoom
|
|
float zooom = (time2-3311.)*speed;
|
|
from += forward* zooom;
|
|
float sampleShift = mod( zooom, stepsize );
|
|
|
|
float zoffset = -sampleShift;
|
|
sampleShift /= stepsize; // make from 0 to 1
|
|
|
|
//volumetric rendering
|
|
float s=0.24;
|
|
float s3 = s + stepsize/2.0;
|
|
vec3 v=vec3(0.);
|
|
float t3 = 0.0;
|
|
|
|
vec3 backCol2 = vec3(0.);
|
|
for (int r=0; r<volsteps; r++) {
|
|
vec3 p2=from+(s+zoffset)*dir;// + vec3(0.,0.,zoffset);
|
|
vec3 p3=from+(s3+zoffset)*dir;// + vec3(0.,0.,zoffset);
|
|
|
|
p2 = abs(vec3(tile)-mod(p2,vec3(tile*2.))); // tiling fold
|
|
p3 = abs(vec3(tile)-mod(p3,vec3(tile*2.))); // tiling fold
|
|
#ifdef cloud
|
|
t3 = field(p3);
|
|
#endif
|
|
|
|
float pa,a=pa=0.;
|
|
for (int i=0; i<iterations; i++) {
|
|
p2=abs(p2)/dot(p2,p2)-formuparam; // the magic formula
|
|
//p=abs(p)/max(dot(p,p),0.005)-formuparam; // another interesting way to reduce noise
|
|
float D = abs(length(p2)-pa); // absolute sum of average change
|
|
a += i > 7 ? min( 12., D) : D;
|
|
pa=length(p2);
|
|
}
|
|
|
|
|
|
//float dm=max(0.,darkmatter-a*a*.001); //dark matter
|
|
a*=a*a; // add contrast
|
|
//if (r>3) fade*=1.-dm; // dark matter, don't render near
|
|
// brightens stuff up a bit
|
|
float s1 = s+zoffset;
|
|
// need closed form expression for this, now that we shift samples
|
|
float fade = pow(distfading,max(0.,float(r)-sampleShift));
|
|
//t3 += fade;
|
|
v+=fade;
|
|
//backCol2 -= fade;
|
|
|
|
// fade out samples as they approach the camera
|
|
if( r == 0 )
|
|
fade *= (1. - (sampleShift));
|
|
// fade in samples as they approach from the distance
|
|
if( r == volsteps-1 )
|
|
fade *= sampleShift;
|
|
v+=vec3(s1,s1*s1,s1*s1*s1*s1)*a*brightness*fade; // coloring based on distance
|
|
|
|
backCol2 += mix(.4, 1., v2) * vec3(1.8 * t3 * t3 * t3, 1.4 * t3 * t3, t3) * fade;
|
|
|
|
|
|
s+=stepsize;
|
|
s3 += stepsize;
|
|
}
|
|
|
|
v=mix(vec3(length(v)),v,saturation); //color adjust
|
|
|
|
vec4 forCol2 = vec4(v*.01,1.);
|
|
#ifdef cloud
|
|
backCol2 *= cloud;
|
|
#endif
|
|
backCol2.b *= 1.8;
|
|
backCol2.r *= 0.05;
|
|
|
|
backCol2.b = 0.5*mix(backCol2.g, backCol2.b, 0.8);
|
|
backCol2.g = 0.0;
|
|
backCol2.bg = mix(backCol2.gb, backCol2.bg, 0.5*(cos(time*0.01) + 1.0));
|
|
gl_FragColor = forCol2 + vec4(backCol2, 1.0);
|
|
}
|