openGL moving flag in the wind

heres a demo of waving flag in the wind using opengl and glvideotexture_chung (one single quad with animated texture)  https://sourceforge.net/projects/seashore-chung/       

glvideotexture_chung video to 3D openGL textures conversion

glvideotexture chung / freeGIFviewer is a small gif / video loops  (about 11secs 9fps avi,wmv,gif) to 3D openGL textures (12 textures 1024 or 512 or 256 jpg per video , 8 images per texture) viewer converter with demo game example animated 3D seashore island written in compiled freebasic . Uses classic openGL (i dont like modern openGL, all i expect from openGL is easy to use and fast enough), can run on old pcs (no glsl). The generated textures (jpg) can be used in any apps and are 2x to 32x more compact than the original video . A single sub determines the texture index number and its coords according to time.
added glgiftexture does the same thing with animated gif images.
added freeGIFviewer saves gif frames to disk and shows them with openGL

link =>   https://sourceforge.net/projects/glvideotexture-chung/

seashore 3D video =>  https://www.youtube.com/watch?v=Rq1P26xLrhc

(02/07/2018) sailships with wind sail simulation added