How to use GPUImage to implement grid algorithm?

Hello, everyone. I want to realize the algorithm of moving least square image deformation.
I want to use vertex shaders to implement the mesh algorithm.
but I don"t know how to operate OpenGL ES 2.0, which is to griddle the texture and make it look like a small triangle, asking for advice.

May.31,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b93c-2c28d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b93c-2c28d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?