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General / Tearing issue probably not related to vsync
« on: January 27, 2013, 10:01:31 pm »
I've been working on a maze game and I've come across a strange issue with visual tearing on the top of the screen. I've posted a screenshot to make this a bit easier to visualize (note that the tearing does not occur in the screenshot). You'll notice that map is basically neon vertical and horizontal lines and that the camera centers on the stick figure (unless it's at the edge of the level, like in the screenshot).
The problem is that when the stick figure moves left or right on the map the vertical lines at the very top of the screen will tear. The horizontal lines will not tear if the figure moves up or down and I've found that the problem occurs no matter the framerate it is being displayed at. I am currently running this on Kubuntu 12.04 with an nvidia driver. I saw in the forums another post about a tearing problem in kubuntu with nvidia, but I've disabled system-forced v-sync and ensured that the game was running at unlimited FPS (at least for testing purposes - I usually have a FPS counter on the screen, but I'm working on updating it right now, so it's not there).
I did a brief search online and found some suggestions to try limiting the game processing speed instead of the display speed to see if that has an impact, but still the same. I've also done the opposite and set the framerate to very low. The game is choppy at pretty much 40fps or below, I feel, but the tearing still occurs. I'm building this on a laptop with a 60hz display, so if this were simply a vsync issue I imagine it would have gone away with the decrease to 40fps. I feel that, no matter what I've tried, this tearing persists. Does anyone have any ideas of stuff I could do/try?
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The problem is that when the stick figure moves left or right on the map the vertical lines at the very top of the screen will tear. The horizontal lines will not tear if the figure moves up or down and I've found that the problem occurs no matter the framerate it is being displayed at. I am currently running this on Kubuntu 12.04 with an nvidia driver. I saw in the forums another post about a tearing problem in kubuntu with nvidia, but I've disabled system-forced v-sync and ensured that the game was running at unlimited FPS (at least for testing purposes - I usually have a FPS counter on the screen, but I'm working on updating it right now, so it's not there).
I did a brief search online and found some suggestions to try limiting the game processing speed instead of the display speed to see if that has an impact, but still the same. I've also done the opposite and set the framerate to very low. The game is choppy at pretty much 40fps or below, I feel, but the tearing still occurs. I'm building this on a laptop with a 60hz display, so if this were simply a vsync issue I imagine it would have gone away with the decrease to 40fps. I feel that, no matter what I've tried, this tearing persists. Does anyone have any ideas of stuff I could do/try?
[attachment deleted by admin]