c++ - Qt OpenGL transform feedback buffer functions missing -

i've been following tutorial series learning opengl, , current tutorial i'm trying involves creating particle systems using opengl transform feedback buffer.

in application i've been using qt version 5.4.2 simple 2d interface design, 3d rendering since seems have plethora of classes working opengl.

everything going smoothly point, despite having access opengl functions version 4.3, still seem missing functions using transform feedback buffer, according opengl wiki have been core functions since version 3.0.

i have done quick research , found old news items , blog posts in 2012 possibly supporting such features in future, can't find relevant since then.

in past i've seen people figure out ways access other functions qt wrappers haven't directly implemented, i'm unsure of how on own.

so, in nutshell, how can make use of opengl transform feedback buffer , other similar functions in qt 5.4.2?

i hate stuck @ point because wrapper isn't finished.

in off-chance i'm missing header inclusion, i've tried including following functions i'm after still undefined:

#include <qopenglfunctions> #include <qopenglfunctions_4_3_core> #include <qtopenglextensions/qopenglextensions> #include <qtopengldepends> #include <qtopengl/qgl.h> #include <qtopengl> #include <gl/gl.h> #include <gl/glu.h> 

it turned out never extended class use qopenglfunctions_4_3_core, , instead qopenglfunctions. changing former solved problem.