This is a very basic OpenGL demo for testing NVIDIA's G-SYNC technology on Linux.
The demo simply draws a vertical bar moving accross the screen at constant speed, but deliberately rendered at a variable frame rate.
The min and max frame rates can be manually changed at runtime, by step of 10 fps and with a min of 10 fps.
The demo also allows to toggle V-Sync on/off. Here are the expected effects:
| G-SYNC | V-Sync | Effects |
|---|---|---|
| ON | ON | No tearing, no stuttering unless frame rate is too low (30 fps or less) |
| ON | OFF | No tearing below monitor's refresh rate, tearing above, no stuttering |
| OFF | ON | No tearing but stuttering below monitor's refresh rate |
| OFF | OFF | Tearing, stuttering below monitor's refresh rate |
At runtime, the demo modifies two global parameters of your NVIDIA's settings:
- The "Allow G-SYNC" parameter (which can be controlled by the user during the demo)
- The G-SYNC visual indicator (forced to be enabled at demo startup)
Those parameters are reset to their initial value when the demo exits normally. In case of an abnormal exit (process crashed or get killed), you should check your settings to ensure they have the values you want.
The package is available for Arch Linux in the AUR
The demo is written in C99 and uses the legacy OpenGL 1.x API and requires the following libraries:
- FreeGLUT
- GLEW
- libXNVCTRL (from nvidia-settings)
On Ubuntu, you can install dependencies with the following command:
sudo apt install freeglut3-dev libglew-dev libxnvctrl-dev
You will also need NVIDIA's proprietary driver and its development files installed.
In project's root directory, type:
make
After building, you can run the demo by typing:
./gl-gsync-demo
See the LICENSE file for license rights and limitations (MIT).