C++ OpenGL flickering Issues -

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im having problem, when render 1 cube it's okay, if add multiple cubes of them start flickering.. might because intefering each other im using double dubbers shouldn't that. here code of render method

for (std::vector<entity *>::iterator iterator = entityarray->begin(); iterator != entityarray->end(); iterator++) {      entity *entity = *iterator;     if (entity->getvertexbuffer() != null) {          glclear(gl_color_buffer_bit | gl_depth_buffer_bit);          gluseprogram(entity->getvertexbuffer()->getshader()->getprogramhandle());          glloadidentity();         glulookat(_currentcamera->getposition().x,             _currentcamera->getposition().y,             _currentcamera->getposition().z,             _currentcamera->geteyevector().x,             _currentcamera->geteyevector().y,             _currentcamera->geteyevector().z,             _currentcamera->getupvector().x,             _currentcamera->getupvector().y,             _currentcamera->getupvector().z);          gltranslatef(entity->getposition().x, entity->getposition().y, entity->getposition().z);          glrotatef(entity->getrotation().x, 0.0f, 0.0f, 1.0f);         glrotatef(entity->getrotation().y, 0.0f, 1.0f, 0.0f);         glrotatef(entity->getrotation().z, 1.0f, 0.0f, 0.0f);          glscalef(entity->getscale().x, entity->getscale().y, entity->getscale().z);          gluniform4f(entity->getvertexbuffer()->getshader()->get_ucolor(),             entity->getvertexbuffer()->getshaderdata()->get_ucolorvalue().x,             entity->getvertexbuffer()->getshaderdata()->get_ucolorvalue().y,             entity->getvertexbuffer()->getshaderdata()->get_ucolorvalue().z,             entity->getvertexbuffer()->getshaderdata()->get_ucolorvalue().w);          gluniform3f(entity->getvertexbuffer()->getshader()->get_ulightposition(),             entity->getvertexbuffer()->getshaderdata()->get_ulightposition().x,             entity->getvertexbuffer()->getshaderdata()->get_ulightposition().y,             entity->getvertexbuffer()->getshaderdata()->get_ulightposition().z);           entity->getvertexbuffer()->configurevertexattributes();         entity->getvertexbuffer()->rendervertexbuffer();          glfwswapbuffers(_window);         glfwpollevents();      } }

clear first, draw cubes, swap, this:

glclear();  (cube in cubes) { draw(cube); }  glfwswapbuffers(_window); glfwpollevents();

that should solve it.


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