Removed a couple of strays.
Adding SMAA sample. Work in progress. Edge detection works.
All 3 passes implemented. The second pass yields incorrect results, though.
Fixed a couple of errors in the 2nd pass shader. Didn't help much.
Got it! I had to make the #include work, so I did not have to tinker too much with the official shader file. To support GLSL 120, I had to add the SMAA_GLSL profile. The vertex shaders proved stubborn, as they did not call the functions properly (well, they probably did but nothing happened). So I had to hard-code those. Should not be too much of a problem, as they are quite small.
Cleaned up. Added executable and readme.