Dodgy Icons Graphics In AmigaOS 3.9 (Under AGA)

CU_AMiGA · 28 June 2010, 15:26

Hi

I have AmigaOS 3.9 installed on my hard drive. I decided to go back into AGA mode for something. I normally use the Picasso 96 screenmode (i have Picasso IV). But under AGA the icons seem to go corrupted (the icon graphics) when i click on them. Sometimes even the desktop itself goes corrupted when you click a mouse button. I heard these symptoms occur when your AmigaOS isnt installed properly. When i installed AmigaOS 3.9 i didnt use the emergancy disk (for some reason this wouldnt work - errors), instead i just insatalled AmigaOS 3.9 straight away, and then once again on top (a method backed by thomas way back). So i m not sure wot to do. I was going to try and reinstall again using the emergancy disk but i will wait for peoples opinions here!

Regards

thomas · 28 June 2010, 17:26

Even if you select an AGA screenmode, Picasso96 is still active. Move the PicassoIV driver from Devs/Monitors to Storage/Monitors and reboot in order to deactivate it.

Edit: and run Prefs/Workbench and change "store icons in" from "other memory" to "graphics memory".

CU_AMiGA · 28 June 2010, 17:32

hhhmmm i ll try that! thanks!

CU_AMiGA · 28 June 2010, 21:18

yep you were right thomas. working fine now! thanks!

PeterK · 28 June 2010, 23:03

Hello CU_AMiGA,

it's not really necessary to disable the P96 driver or to switch to "graphics memory" in Prefs/Workbench. You can also use ECS/AGA modes without graphics corruption when you mark "Disable Amiga Blitter" in Prefs/PVS (the Picasso96 Variable Settings). Maybe PVS is located in your Picasso96 drawer instead?

CU_AMiGA · 29 June 2010, 16:46

its ok dude problem is sorted! thanks

PeterK · 29 June 2010, 18:58

Yeah, but with my method you can switch screenmodes on the fly from P96 to AGA or vice versa at any time without changing your settings or even removing the monitor driver. Please remember that also your applications may want to open an ECS/AGA screen directly.

Ok, I don't know if my method works with a PicassoIV card, but I had exactly the same problem as you with P96 <-> AGA on WinUAE.

cmsj · 23 July 2016, 00:00

Quote:

Originally Posted by PeterK

Yeah, but with my method you can switch screenmodes on the fly from P96 to AGA or vice versa at any time without changing your settings or even removing the monitor driver. Please remember that also your applications may want to open an ECS/AGA screen directly.

Ok, I don't know if my method works with a PicassoIV card, but I had exactly the same problem as you with P96 <-> AGA on WinUAE.

Are you able to explain why this is happening? I'm also seeing it on an A4000 and either switching to Chip Memory or using PVS' Disable Blitter seems to be working, but I'd like to understand why (partly because I'm in the process of setting up a new Mediator and want to rule that out as a factor).

(and yes, I know I'm replying 6 years late

thomas · 23 July 2016, 10:18

Moving gfx data around on an RTG gfx card has to be done by the CPU anyway, therefore P96 allocates bitmaps in Fast RAM for speed. In Prefs/Workbench you can tell WB to do the same.

However, if you open a native screen, the screen's bitmap must reside in Chip RAM because the Amiga native gfx chips can only access Chip RAM. And moving around bitmaps in Chip RAM is fastest done by the Amiga blitter which can access only Chip RAM, too.

Now there is a conflict if a custom bitmap (not allocated by AllocBitMap) is located in Fast RAM but should be copied to the native display. If you try to do this with the blitter it will copy some random Chip RAM instead of the Fast RAM where the bitmap is located.

Therefore you have to disable the Amiga blitter and use the CPU to copy bitmaps if the bitmaps reside in Fast RAM and the display is in Chip RAM.

PeterK · 23 July 2016, 21:46

Well, what should I say now ??
Couldn't explain it better than thomas.

cmsj · 27 August 2016, 13:13

Thanks thomas, that was very clear

28 June 2010, 15:26	#1
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	Dodgy Icons Graphics In AmigaOS 3.9 (Under AGA) Hi I have AmigaOS 3.9 installed on my hard drive. I decided to go back into AGA mode for something. I normally use the Picasso 96 screenmode (i have Picasso IV). But under AGA the icons seem to go corrupted (the icon graphics) when i click on them. Sometimes even the desktop itself goes corrupted when you click a mouse button. I heard these symptoms occur when your AmigaOS isnt installed properly. When i installed AmigaOS 3.9 i didnt use the emergancy disk (for some reason this wouldnt work - errors), instead i just insatalled AmigaOS 3.9 straight away, and then once again on top (a method backed by thomas way back). So i m not sure wot to do. I was going to try and reinstall again using the emergancy disk but i will wait for peoples opinions here! Regards

29 June 2010, 18:58	#7
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,378	Yeah, but with my method you can switch screenmodes on the fly from P96 to AGA or vice versa at any time without changing your settings or even removing the monitor driver. Please remember that also your applications may want to open an ECS/AGA screen directly. Ok, I don't know if my method works with a PicassoIV card, but I had exactly the same problem as you with P96 <-> AGA on WinUAE. Last edited by PeterK; 29 June 2010 at 19:10.

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28 June 2010, 17:26	#2
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,002	Even if you select an AGA screenmode, Picasso96 is still active. Move the PicassoIV driver from Devs/Monitors to Storage/Monitors and reboot in order to deactivate it. Edit: and run Prefs/Workbench and change "store icons in" from "other memory" to "graphics memory".

28 June 2010, 17:32	#3
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	hhhmmm i ll try that! thanks!

28 June 2010, 21:18	#4
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	yep you were right thomas. working fine now! thanks!

28 June 2010, 23:03	#5
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,378	Hello CU_AMiGA, it's not really necessary to disable the P96 driver or to switch to "graphics memory" in Prefs/Workbench. You can also use ECS/AGA modes without graphics corruption when you mark "Disable Amiga Blitter" in Prefs/PVS (the Picasso96 Variable Settings). Maybe PVS is located in your Picasso96 drawer instead?

29 June 2010, 16:46	#6
CU_AMiGA Banned Join Date: Dec 2003 Location: Exeter Age: 39 Posts: 970	its ok dude problem is sorted! thanks

23 July 2016, 10:18	#9
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,002	Moving gfx data around on an RTG gfx card has to be done by the CPU anyway, therefore P96 allocates bitmaps in Fast RAM for speed. In Prefs/Workbench you can tell WB to do the same. However, if you open a native screen, the screen's bitmap must reside in Chip RAM because the Amiga native gfx chips can only access Chip RAM. And moving around bitmaps in Chip RAM is fastest done by the Amiga blitter which can access only Chip RAM, too. Now there is a conflict if a custom bitmap (not allocated by AllocBitMap) is located in Fast RAM but should be copied to the native display. If you try to do this with the blitter it will copy some random Chip RAM instead of the Fast RAM where the bitmap is located. Therefore you have to disable the Amiga blitter and use the CPU to copy bitmaps if the bitmaps reside in Fast RAM and the display is in Chip RAM.

23 July 2016, 21:46	#10
PeterK Registered User Join Date: Apr 2005 Location: digital hell, Germany, after 1984, but worse Posts: 3,378	Well, what should I say now ?? Couldn't explain it better than thomas.

27 August 2016, 13:13	#11
cmsj Registered User Join Date: Feb 2016 Location: London / UK Posts: 166	Thanks thomas, that was very clear

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