Add shader programs to be tracked

shader/fadeCircle.frag

@@ -0,0 +1,12 @@
+#version 430 core
+in vec4 gColor;
+in vec2 cenPosTrans;
+in float gRad;
+out vec4 fColor;
+
+void main()
+{
+  vec2 pos = gl_FragCoord.xy;
+  float dist = max(0 , 1 - 2 * distance(pos,cenPosTrans) / (gRad));
+  fColor = vec4( gColor.xyz , pow(gColor.z*dist,2) );
+}