WGL_NV_swap_group
https://www.khronos.org/registry/OpenGL/extensions/NV/WGL_NV_swap_group.txt
WGL_NV_swap_group

	BOOL wglBindSwapBarrierNV (GLuint group, GLuint barrier)
	BOOL wglJoinSwapGroupNV (HDC hDC, GLuint group)
	BOOL wglQueryFrameCountNV (HDC hDC, GLuint* count)
	BOOL wglQueryMaxSwapGroupsNV (HDC hDC, GLuint* maxGroups, GLuint* maxBarriers)
	BOOL wglQuerySwapGroupNV (HDC hDC, GLuint* group, GLuint* barrier)
	BOOL wglResetFrameCountNV (HDC hDC)