How to fix image stuttering in an OpenGL application on an NVidia graphics card?

Question

3D

There are several C++ applications in OpenGL. They work fine on old, built-in and discrete, video cards. There was a problem with the new NVidia 2070 graphics card. It seems to be the FPS synchronization with the display refresh rate. It looks like once a second the picture slows down a little. Tried to disable sync. It didn't work: 60 FPS remained. The programs have a small delay in the form of Sleep - to reduce the load. Removed her. The frame rate increased then ~ 1000, the brakes disappeared. An interesting point: if Sleep (1) or even usleep (1) was installed, the video card gave out a stable 60 FPS.

Question. Is it possible to make lightweight OpenGL (1.0) applications run smoothly on NVidia without jacking up FPS?

Answer 1

It was suggested that this effect is called "stuttering". Unfortunately, I did not find a way to deal with it on OpenGL. Basically, all discussions of this problem come down to setting up the system.
PS I read the discussion of this issue more carefully . I seem to have solved the problem by setting "wglSwapIntervalEXT(1) ", removing Sleep, and disabling the "tweak" of incrementing motion/turn variables, setting instead a constant factor independent of current FPS.
PPS The solution does not work well if the program uses multithreading.

Answer 2

You need to set up VSYNC.

In short:
wglSwapIntervalEXT(0) - disables vsync, OK
wglSwapIntervalEXT(1) - adaptive vsync, NOT OK !
wglSwapIntervalEXT(-1) - adaptive vsync, OK
wglSwapIntervalEXT(-2) - adaptive vsync half rate, OK