oki

learning/shaping/dot.frag

@@ -0,0 +1,25 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform vec2 u_resolution;
+uniform vec2 u_mouse;
+uniform float u_time;
+
+#define PI 3.14159265359
+
+
+// original test used 4. for test. It's also responsible for changing the radius, it seems anything under 1 is larger than the screen when using a radius of .9
+float circle(in vec2 _st, in float _radius, in float test){
+  vec2 dist = _st-vec2(0.5);
+  return 1.-smoothstep(_radius-(_radius*.01),_radius+(_radius*.01),
+                       dot(dist,dist)*test);
+}
+
+void main() {
+  vec2 st = gl_FragCoord.xy/u_resolution;
+  vec3 color = vec3(0.0,0.0,0.0);
+  color = vec3(circle(st,0.001, 4.0));
+  gl_FragColor = vec4(color, 1.0);
+
+}