Now have anti-aliasing with framebuffers and can do post processing on it. Look at shaders/30-screen-bw.frag.glsl to see.

30-anti-aliasing/shaders/30-screen.frag.glsl

@@ -0,0 +1,11 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+
+void main()
+{
+    FragColor = texture(screenTexture, TexCoords);
+}