Strange diagonal split in OpenGL mode

Davidian · Post by **Davidian** » Fri Feb 25, 2005 6:45 am

If I run ZSNES in an OpenGL mode the display is split diagonaly from the upper right corner to the lower left. It isn't noticable unless there is some sort of animation going on. The upper left triangular section appears to be running at a much lower frame rate than the lower right section which is running great.

I have disabled all filters and am running at the lowest possible resolution.

My system specs are:

Linux 2.6.10
ATI fglrx driver 8.10.19
X.org 6.8.1

AMD AthlonXP 2400+
ATI Radeon 9800 SE
1 GB RAM

Jipcy · Post by **Jipcy** » Fri Feb 25, 2005 6:49 am

Is it only some games or all games that this happens?

Davidian · Post by **Davidian** » Fri Feb 25, 2005 6:50 am

All games. I can even see it in the GUI if I have one of those effects running.

Jipcy · Post by **Jipcy** » Fri Feb 25, 2005 6:54 am

It definitely sounds like a weird interaction between zsnes and your video card. Does the diagonal split affect the GUI bar at the top? Or just the animated part below?

Someone with more experience with the SDL/Linux builds would have to help you more.

Davidian · Post by **Davidian** » Fri Feb 25, 2005 7:01 am

I would guess that it is since it is almost completely in the upper left section. It isn't animated though so I can't really tell for sure.

darkfalz · Post by **darkfalz** » Mon Feb 28, 2005 3:38 am

I can explain this.

In 2D 3D mode (if that makes sense) then a rectangle is rendered directly as a rectangle.

In true 3D rendering mode however, there's no such thing as a rectangle. A rectangle is rendered as two triangles. The line you are seeing is the join between the triangles.

I know this is true for Direct3D, but I guess OpenGL is similar. This may be dependent on the driver, the API or the code itself, but that's the cause.

Noxious Ninja · Post by **Noxious Ninja** » Mon Feb 28, 2005 3:51 am

That explains why a triangle effect is possible, but it doesn't explain why it happens.

Reznor007 · Post by **Reznor007** » Mon Feb 28, 2005 4:06 am

Driver bug most likely.

Post by **pagefault** » Sat Apr 16, 2005 4:02 pm

I never saw this bug, What are the exact settings you are using? I have similar hardware specs.

Davidian · Post by **Davidian** » Tue May 03, 2005 8:49 am

Turns out the problem was actually in the sound options the whole time! Turning off 8-Point Interpolation did the trick. Also, zsnes hasn't crashed on me since. It was crashing alot with 8-Point turned on.