Still some bad flickering remains...

Blackgoat · 28 July 2016, 02:56

[ Show youtube player ]

Generally, it run ok, only characters bob flicker if it appears in area approx. 100 pixels from top of the screen. Don't have any idea why. If I mess with order of bob update, screen swap, wait vbl etc. it only get worse. Why only in top border of the screen? Screen have size 800*656 pixels, its okay for AMOS to handle, imho.

Retro1234 · 28 July 2016, 03:29

I like your demo - ive never seen that type of flicker - all I can say is I am having some flicker since I updated my graphics driver recently but I use a different emulator, so maybe emulator issue.

idrougge · 28 July 2016, 10:57

Are we talking about emulation or a real machine?

roondar · 28 July 2016, 13:43

Now, I can't be 100% sure, but this looks a lot like you got the order of the double buffer swaps wrong. It looks like you're showing the buffer you are drawing to instead of the one that is ready to be shown.

Blackgoat · 28 July 2016, 18:31

Solved, I made some monster of program which accidentally combine screen offset hardware scroll I am working with now, and "screen copy physic to logic" method with which I begin a I forgot that procedures from is is still active :-) when I clear program from old code, it run without flickering and fast enough.

28 July 2016, 02:56	#1
Blackgoat Registered User Join Date: Feb 2016 Location: Czech Republic Posts: 26	Still some bad flickering remains... [ Show youtube player ] Generally, it run ok, only characters bob flicker if it appears in area approx. 100 pixels from top of the screen. Don't have any idea why. If I mess with order of bob update, screen swap, wait vbl etc. it only get worse. Why only in top border of the screen? Screen have size 800*656 pixels, its okay for AMOS to handle, imho.

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28 July 2016, 03:29	#2
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,773	I like your demo - ive never seen that type of flicker - all I can say is I am having some flicker since I updated my graphics driver recently but I use a different emulator, so maybe emulator issue.

28 July 2016, 10:57	#3
idrougge Registered User Join Date: Sep 2007 Location: Stockholm Posts: 4,332	Are we talking about emulation or a real machine?

28 July 2016, 13:43	#4
roondar Registered User Join Date: Jul 2015 Location: The Netherlands Posts: 3,410	Now, I can't be 100% sure, but this looks a lot like you got the order of the double buffer swaps wrong. It looks like you're showing the buffer you are drawing to instead of the one that is ready to be shown.

28 July 2016, 18:31	#5
Blackgoat Registered User Join Date: Feb 2016 Location: Czech Republic Posts: 26	Solved, I made some monster of program which accidentally combine screen offset hardware scroll I am working with now, and "screen copy physic to logic" method with which I begin a I forgot that procedures from is is still active :-) when I clear program from old code, it run without flickering and fast enough.

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