holo_wip

experiments/holo/holo.frag

@@ -17,13 +17,52 @@ vec3 cosPalette(float t) {
   return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor));
 }
 
+vec2 rotate(vec2 st, float a) {
+  st = mat2(cos(a),-sin(a),sin(a),cos(a))*(st-.5);
+  return st+.5;
+}
+
+float rhombSDF(vec2 st) {
+  vec2 st1 = (st*2.-1.)*2.;
+  vec2 st2 = (vec2(st.x,1.-st.y)*2.-1.)*2.;
+  float triangle1 = max(abs(st1.x)*.866025+st1.y*.5,-st1.y*.5);
+  float triangle2 = max(abs(st2.x)*.866025+st2.y*.5,-st2.y*.5);
+  return max(triangle1, triangle2);
+}
+
+float fill(float x, float size) {
+  return 1.-step(size, x);
+}
 
 void main() {
   vec2 st = gl_FragCoord.xy/u_resolution;
   vec3 color = vec3(0.0,0.0,0.0);
   float alpha = 1.0;
+  float size = 1.;
+  float final_color = 0.5;
+  float amount = 1.;
+  float off = .3;
+  float max_int = .5;
+  float mouse_dist = distance(u_mouse.xy/u_resolution.xy,vec2(.5,.5));
+  float speed = 1.;
+  int iterations = 2;
+  st = fract(st*amount);
+  for (int i = 0; i<iterations;i++) {
+    float n = fill(rhombSDF(st+vec2(0.,off)),size);
+    float e = fill(rhombSDF(st+vec2(off,0.)),size);
+    float s = fill(rhombSDF(st+vec2(0.,off*-1.)),size);
+    float w = fill(rhombSDF(st+vec2(off*-1.,.0)),size);
+    float comb = n+e+s+w;
+    vec2 central = st - vec2(.5);
 
+    comb = comb *(max_int-(abs(central.x+central.y)*sin(u_time*speed)+.3));
+    final_color = mix(final_color, comb, (st.x+st.y)/2.);
+    //final_color = mix(final_color,(n+e+s+w)*(max_int-(st.x*(.3+(sin(u_time*speed)*.7))),st.x);
+    off += .3;
+    rotate(st, radians(90.));
+  }
+    //color += fill(n, .2);
   
-
+  color += cosPalette(final_color);
   gl_FragColor = vec4(color, alpha);
 }