geen id

learning/PixelSpirit/bundle.frag

@@ -0,0 +1,42 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+#define PI 3.14159265359
+
+const vec3 uAColor = vec3(.5,.5,.5);
+const vec3 uBColor = vec3(.5,.5,.5);
+const vec3 uCColor = vec3(1.,1.,1.);
+const vec3 uDColor = vec3(.0,.33,.67);
+
+//get colors from http://dev.thi.ng/gradients/
+vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
+
+float hexSDF(vec2 st) {
+  st = abs(st*2.-1.);
+  return max(abs(st.y),st.x*.866025+st.y*.5);
+}
+
+float stroke(in float x_coor, float s, float width){
+  float d = step(s,x_coor+width*.5)-step(s,x_coor-width*.5);
+  return clamp(d, 0.,1.);
+}
+
+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;
+  st = st.yx;
+  color += stroke(hexSDF(st),.6,.1);
+  color += fill(hexSDF(st-vec2(-.06,-.1)),.15);
+  color += fill(hexSDF(st-vec2(-.06,.1)),.15);
+  color += fill(hexSDF(st-vec2(.11,.0)),.15);
+  
+
+  gl_FragColor = vec4(color, alpha);
+}