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Old 28 May 2016, 14:49   #1
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Join Date: Jun 2015
Location: Los Angeles / California
Posts: 10
Possible Direct3D scaling issue

Hi Tony,

There is a minor D3D rendering issue I noticed which doesn't happen with DirectDraw, and I was able to notice it with all the beta versions since uae.gfx started working in OS4, as that feature made it possible to use 1080p resolution.
If it already happened with earlier betas I wouldn't know as with the PicassoIV emulation I couldn't get more than 1280x960, making the display too blurry to notice minor artifacts.

I made some B/W background patterns to better illustrate the issue, and as can be seen on the attached screenshots (which are resized to 200% to make it easier to see) there are some horizontal "stretching" artifacts on the column spawning the first 120 pixels or so.

Without the special pattern it's not as pronounced, but still causes the fonts of icon names, Project menu and text editors to look uneven, as can be seen on the WB titlebar.

I'm using a 3840x2160 display, so to keep the pixels crisp I set the WinUAE "Display->Screen->Fullscreen" setting to 3840x2160 and the Amiga ScreenMode to 1920x1080, resulting in 2x2 physical pixels for each "Amiga" pixel since WinUAE scales it up to 3840x2160.

The same happens with RTG set to either "Full-window" or "Fullscreen". Of course in windowed mode it doesn't happen as no scaling takes place.

I don't know if it could be an issue with D3D itself, or the buffer used by WinUAE, but the WinUAE window (F12) doesn't show any artifact in fullscreen mode even though the GUI too gets scaled up.

With DirectDraw there are no scaling artifacts but for some reason the boot time seems much longer, and the gfx speed is around 10% slower overall, according to the intuition and graphics tests of SysSpeed.

I'd call these artifacts a minor issue as the rest of the screen is razor sharp :-)

Ironically Windows doesn't know how to set a proper 2:1 ratios for itself and gets all blurry if trying to set the desktop resolution to 1920x1080.
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Attached Files
File Type: uae A4K.uae (13.9 KB, 23 views)
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