[WIP] Galaga conversion - Page 6

lilwshu · Yesterday, 21:46

I get quite heavy graphical glitching on the starfield during gameplay on an A1200/PAL/TF1260/WB + KS 3.2. It has also got stuck in attract mode with the "tractor beam" sound effect looping.

jotd · Yesterday, 22:56

if you have glitches, I'd advise to turn off stars scroll. This is probably a sync problem between display and "scrolling".

Marconelly · Yesterday, 23:22

Quote:

Originally Posted by jotd

Runs perfectly at 50FPS on fastmem-equipped amigas...

I'm assuming this doesn't include A500 with real fastmem? Has anyone tried the game on that configuration?

nikosidis · Today, 12:16

High-score is always 0, but I see a high-score file in the folder? Real hardware. Amiga 4000.

nikosidis · Today, 12:25

Quote:

Originally Posted by jotd

if you have glitches, I'd advise to turn off stars scroll. This is probably a sync problem between display and "scrolling".

Thanks, but it does not help. It is horizontal lines showing up from time to time.

Don_Adan · Today, 13:09

Quote:

Originally Posted by jotd

if you have glitches, I'd advise to turn off stars scroll. This is probably a sync problem between display and "scrolling".

You can see glitches about 2 minutes 2 secs on Saberman video.

[ Show youtube player ]

For me this is bug.
Something is not cleared?

nikosidis · Today, 13:16

Ah, thanks. it is the same. Good to know it is not only on my hardware

From 7:43 it is worse.

Don_Adan · Today, 13:55

yes, after 7 minutes, it looks very bad.
for me something is not cleared, but maybe this is other bug.

jotd · Today, 14:33

this is a hardware sprite bug. I also have this on my A1200 after a while. Strange as the code does exactly the same all the time. DMA interaction with something else probably.

nikosidis · Today, 14:40

Quote:

Originally Posted by jotd

this is a hardware sprite bug. I also have this on my A1200 after a while. Strange as the code does exactly the same all the time. DMA interaction with something else probably.

Does it happen if you completely remove the stars or maybe audio?

Is there something like audio buffers? I know I am way out there but the sound is also distorted.

Don_Adan · Today, 14:55

Quote:

Originally Posted by jotd

this is a hardware sprite bug. I also have this on my A1200 after a while. Strange as the code does exactly the same all the time. DMA interaction with something else probably.

Im not graphical expert, but I dont think so.
For me it looks like accumulated code bug.
Exactly trashed data or trashed register(s), f.e via movem.w instruction.
You can try to call Stage 4 as first stage, and check if graphical glitches occured.

Edit.
First time when I see graphical glitches is after ship was captured and recaptured (about 1 minutes 35 secs).
Exactly before Stage 2 was started.
Then can be init Stage bug too.
You can check without ship capturing too.

Don_Adan · Today, 15:20

Seems to be random bug.
About 3 minutes 48 secs first time for me occured (but I dont have perfect eyes) at this video

[ Show youtube player ]

tomcat666 · Today, 15:30

Quote:

Originally Posted by jotd

this is a hardware sprite bug. I also have this on my A1200 after a while. Strange as the code does exactly the same all the time. DMA interaction with something else probably.

Looks like SPRxDATA or SPRxDATB not set properly or overwritten for some reason ?

Yesterday, 21:46	#101
lilwshu Registered User Join Date: Mar 2020 Location: UK Posts: 254	I get quite heavy graphical glitching on the starfield during gameplay on an A1200/PAL/TF1260/WB + KS 3.2. It has also got stuck in attract mode with the "tractor beam" sound effect looping. Last edited by lilwshu; Yesterday at 21:57.

Today, 12:16	#104
nikosidis Registered User Join Date: Jan 2020 Location: oslo/norway Posts: 1,625	High-score is always 0, but I see a high-score file in the folder? Real hardware. Amiga 4000. Last edited by nikosidis; Today at 12:22.

Today, 13:16	#107
nikosidis Registered User Join Date: Jan 2020 Location: oslo/norway Posts: 1,625	Ah, thanks. it is the same. Good to know it is not only on my hardware From 7:43 it is worse. Last edited by nikosidis; Today at 13:21.

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Yesterday, 22:56	#102
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,405	if you have glitches, I'd advise to turn off stars scroll. This is probably a sync problem between display and "scrolling".

Today, 13:55	#108
Don_Adan Registered User Join Date: Jan 2008 Location: Warsaw/Poland Age: 56 Posts: 2,074	yes, after 7 minutes, it looks very bad. for me something is not cleared, but maybe this is other bug.

Today, 14:33	#109
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,405	this is a hardware sprite bug. I also have this on my A1200 after a while. Strange as the code does exactly the same all the time. DMA interaction with something else probably.

Today, 15:20	#112
Don_Adan Registered User Join Date: Jan 2008 Location: Warsaw/Poland Age: 56 Posts: 2,074	Seems to be random bug. About 3 minutes 48 secs first time for me occured (but I dont have perfect eyes) at this video [ Show youtube player ]

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