I ran some more tests. First of all:
there is no more the bug that shifts the middle of the screen. 3D zooming seems to work in all modes.
I tested in 2 machines with latest build of Kodi bb35a77 that da-anda posted.. Machine A is win 10 pro x64, radeon 7770 with latest stable catalyst driver, according to AMDs driver download utility. This machine is connected to a computer monitor. Everything seems to work ok in this machine.
Machine B is win 7 pro x64 sp1, radeon 7750 with latest stable catalyst driver, according to AMDs driver download utility. This is conencted to a projector. In this machine sometimes I get the "lines bug". Check the photos
https://drive.google.com/file/d/0BzvfPqj...sp=sharing
and
https://drive.google.com/file/d/0BzvfPqj...sp=sharing
In machine B, there are almost no options for scaling algorithm.
When I select render method: DXVA I get to choose from DXVA/Auto
When I select render method: Pixel shaders I get to choose from Bilinear (or bicubic, dont remember)/Auto
When I select render method: Software I get to choose from Bilinear (or bicubic, dont remember)/Auto/Nearest neighbour
In machine A I get all the scaling algorithm options like lanzcos3.
So, as I was saying in machine B I get the lines bug. It happens only to the right, or bottom half of the picture. It doesn't happen allways. It seems to be happening a lot of times with DXVA. It doesn't seem to be happening with software or pixel shaders.
It happens when I zoom the movie past 1.20-1.30 and then stop the movie. Before stopping the movie it displays correctly. The problem begins after I stop and restart.
If I zoom to 1.30+, unzoom to 0.99 and then to 0, most of the times it goes away. If it doesnt go away, I let the zoom to 0, stop and restart the movie and then it displays correctly.
It seems to be connected a little with refresh rate changes. If I select "Adjust display refresh rate:never" it seems to occur less.
Also, when it occurs and I put kodi in a window, immediately, without starting and stopping it changes dependent on the size of the window. When the window is medium size in the center of the screen, there is a small percentage in the right of the right image with lines. If I maximize the window to full screen while keeping the borders and title bar I get the full "lines bug", where the right image is all lines. If I put the window on the right half of the screen it plays ok.
In order to stop the lines bug I have to zoom to 1.30+, 0.99 and then 0. Then stop and restart the movie. This seemed to work almost all the time. If this doesn't work, let zoom to 0 and stop and restart playback.
I could allways stop the lines bug with the above procedure.
I can watch any 3d movie I want with DXVA acceleration and zooming without problems. The problems (may) begin after I stop and restart the movie, or stop and start another 3d movie.
Hope you can get something out of all the above.