openFrameworks addon.
Morph image to another image using mesh warping technique.
http://davis.wpi.edu/~matt/courses/morph/2d.htm
Almost all of the process is in vertex and fragment shader.
Tested on openFrameworks v0.10.1 / Mac OSX 10.14 / XCode 10.2
see simpleExample.
I wrote most of this addon based on Matthias Oostrik's ofxFlowTools. https://github.com/moostrik/ofxFlowTools
many thanks.