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https://mzte.de/git/LordMZTE/dotfiles.git
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69 lines
2.4 KiB
GLSL
69 lines
2.4 KiB
GLSL
#version 300 es
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precision highp float;
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uniform float time;
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in vec2 fragCoord;
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out vec4 fragColor;
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// shader: https://www.shadertoy.com/view/Ms2SDc
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const float PI=3.14159265358979323846;
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const float value=0.0;
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float rand(in vec2 p,in float t) {
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return fract(sin(dot(p+mod(t,1.0),vec2(12.9898,78.2333)))*43758.5453);
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}
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vec2 rotate(vec2 k,float t) {
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return vec2(cos(t)*k.x-sin(t)*k.y,sin(t)*k.x+cos(t)*k.y);
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}
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float scene1(vec3 p) {
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float speed=time*0.5;
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float ground=dot(p,vec3(0.0,1.0,0.0))+0.75;
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float t1=length(abs(mod(p.xyz,2.0)-1.0))-1.35+0.05*cos(PI*p.x*4.0)+0.05*sin(PI*p.z*4.0); // structure
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float t3=length(max(abs(mod(p.xyz,2.0)-1.0).xz-1.0,0.5))-0.075+0.1*cos(p.y*36.0); // structure slices
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float t5=length(abs(mod(p.xyz,0.5))-0.25)-0.975;
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float bubble_w=0.8+0.2*cos(PI*p.z)+0.2*cos(PI*p.x);
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float bubble=length(mod(p.xyz,0.125)-0.0625)-bubble_w;
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float hole_w=0.05;
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float hole=length(abs(mod(p.xz,1.0)-0.5))-hole_w;
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float tube_p=2.0-0.25*sin(PI*p.z*0.5);
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float tube_v=PI*8.0;
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float tube_b=tube_p*0.02;
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float tube_w=tube_b+tube_b*cos(p.x*tube_v)*sin(p.y*tube_v)*cos(p.z*tube_v)+tube_b*sin(PI*p.z+speed*4.0);
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float tube=length(abs(mod(p.xy,tube_p)-tube_p*0.5))-tube_w;
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return min(max(min(-t1,max(-hole-t5*0.375,ground+bubble)),t3+t5),tube);
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}
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void main() {
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float speed=time*0.5;
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float ground_x=1.5*cos(PI*speed*0.125);
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float ground_y=4.0-3.0*sin(PI*speed*0.125)+0.125*value;
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float ground_z=-1.0-speed;
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vec2 position=fragCoord.xy;
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vec2 p=-1.0+2.0*position;
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vec3 dir=normalize(vec3(p*vec2(1.625,1.0),0.75)); // screen ratio (x,y) fov (z)
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dir.yz=rotate(dir.yz,PI*0.25*sin(PI*speed*0.125)-value*0.25); // rotation x
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dir.zx=rotate(dir.zx,PI*cos(-PI*speed*0.05)); // rotation y
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dir.xy=rotate(dir.xy,PI*0.125*cos(PI*speed*0.125)); // rotation z
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vec3 ray=vec3(ground_x,ground_y,ground_z);
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float t=0.0;
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const int ray_n=96;
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for(int i=0;i<ray_n;i++) {
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float k=scene1(ray+dir*t);
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if(abs(k)<0.005) break;
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t+=k*0.5;
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}
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vec3 hit=ray+dir*t;
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vec2 h=vec2(-0.02,0.01); // light
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vec3 n=normalize(vec3(scene1(hit+h.xyy),scene1(hit+h.yxx),scene1(hit+h.yyx)));
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float c=(n.x+n.y+n.z)*0.1;
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vec3 color=vec3(c,c,c)-t*0.0625;
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//color*=0.6+0.4*rand(vec2(t,t),iTime); // noise!
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fragColor=vec4(vec3(c+t*0.08,c+t*0.02,c*1.5-t*0.01)+color*color,1.0);
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}
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