i got lazy

learning/random/2d_random.frag

@@ -0,0 +1,38 @@
+#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 random (vec2 st) {
+  vec2 stm = u_mouse/u_resolution;
+  
+  return fract(sin(dot(st.xy*u_time, stm.xy))*43758.5453123);
+}
+
+
+void main() {
+  vec2 st = (gl_FragCoord.xy*2. - u_resolution.xy)/u_resolution.y;
+  st *= 10.0;
+  vec2 ios = floor(st);
+  vec2 fos = fract(st);
+  vec3 color = vec3(0.0,0.0,0.0);
+  float alpha = 1.0;
+  
+  color += random(ios);
+
+  
+
+  gl_FragColor = vec4(color, alpha);
+}