GLX_NV_swap_group http://www.opengl.org/registry/specs/NV/glx_swap_group.txt GLX_NV_swap_group Bool glXBindSwapBarrierNV (Display* dpy, GLuint group, GLuint barrier) Bool glXJoinSwapGroupNV (Display* dpy, GLXDrawable drawable, GLuint group) Bool glXQueryFrameCountNV (Display* dpy, int screen, GLuint *count) Bool glXQueryMaxSwapGroupsNV (Display* dpy, int screen, GLuint *maxGroups, GLuint *maxBarriers) Bool glXQuerySwapGroupNV (Display* dpy, GLXDrawable drawable, GLuint *group, GLuint *barrier) Bool glXResetFrameCountNV (Display* dpy, int screen)