| Re: [hatari-devel] Blitter bug in STe mode |
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Hi,
On 6/8/20 10:48 PM, Christian Zietz wrote:
Eero Tamminen schrieb:
The most interesting thing is that I couldn't get
left side artifacts to appear below first 16KB of
of screen, or right side artifacts above last 16KB
of screen.
Important information: EmuTOS draws the left line from bottom to top but
the right line from top to bottom. So it only appears roughly the
*second* half of the line.
Ok, so issue always starts at middle of screen, and continues (either up
or down) until EmuTOS
finishes drawing the line with blitter.
Any idea why the garbage lines left behind would
be solid when the window outline is dotted?
To me, it seems related to Blitter restarting. If I change EmuTOS do
draw the vertical lines [1] in "hog" mode, which requires no restarting,
the artifacts go away.
Nicolas, is there something that happens
(occasionally) with blitter in middle of screen
(when it's not in "hog" mode)?
Or does something happen with blitter on VBL, and
it's either 2x or 0.5x faster than VBL rate?
Same as Vincent, I cannot reproduce this on real hardware.
Ok, more evidence of it being potentially Hatari
specific.
[1] Since EmuTOS 0.9.11 vertical lines are handled by hwblit_vertical_line.
Roger mentioned on emutos-devel that he can
reproduce the issue on 0.9.11, but not on
0.9.10.
- Eero