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Amiga computer related discussion => Amiga Software Issues and Discussion => Topic started by: Amigaz on March 17, 2007, 05:29:28 PM

Title: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 05:29:28 PM
Have had some Warp3D problems recently but discovered that the cause has been that I'm using a wallpaper on my desktop, the size and complexety doesn't seem to matter..it eats 2 megs of my RTG memory which results in that no Warp3D stuff will run
Without a backdrup I have almost 5 megs free mem according to availp96 and with an active backdrop it drops to 2.5 megs

This is ridiculous  :crazy:
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Thomas on March 17, 2007, 05:35:45 PM

1024 x 768 x 3 = 2,359,296 Bytes (2.25 MB)

JPEG file size does not matter. In memory the gfx data has to be uncompressed in order to be displayed.

Bye,
Thomas
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 05:47:39 PM
Quote

Thomas wrote:

1024 x 768 x 3 = 2,359,296 Bytes (2.25 MB)

JPEG file size does not matter. In memory the gfx data has to be uncompressed in order to be displayed.

Bye,
Thomas


Thanks for the tech. info, Thomas  :-)

A1200+Mediator=8mb RTG memory = sucks!  :-(
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: keropi on March 17, 2007, 05:51:57 PM
mediator eh?  :-P  :-P  :-P
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 06:18:13 PM
Quote

keropi wrote:
mediator eh?  :-P  :-P  :-P


arghhh...gimme a DCE BPPC  :pissed:
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: adolescent on March 17, 2007, 06:27:54 PM
Quote

AMIGAZ wrote:
A1200+Mediator=8mb RTG memory = sucks!  :-(


Why not turn on the MMU and use all the memory?
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Karlos on March 17, 2007, 06:31:16 PM
Quote

AMIGAZ wrote:
This is ridiculous  :crazy:


No, it's perfectly normal. Of course, the alternative is that the image is stored in Fast RAM and freshly exposed bits of it copied to the workbench screen's framebuffer as you move windows etc around. Then you'd complain it was too slow at redrawing ;-)
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 06:44:11 PM
Quote

adolescent wrote:
Quote

AMIGAZ wrote:
A1200+Mediator=8mb RTG memory = sucks!  :-(


Why not turn on the MMU and use all the memory?


Then Warp3D PPC stuff won't run..  :-(
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: derringer3 on March 17, 2007, 07:32:20 PM
After boot my os3.9 up, the system eat 15MB. I use 1024*768@16bit,and some stuff (blitzkick) wich eat some too. But since I have 128MB fastram its siply don't care.

Anyway try  reinstall. I have the same problem, with different mediator drivers.
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: itix on March 17, 2007, 09:36:39 PM
Quote

No, it's perfectly normal. Of course, the alternative is that the image is stored in Fast RAM and freshly exposed bits of it copied to the workbench screen's framebuffer as you move windows etc around.


But is it good idea waste 1/4 of precious VRAM to the image?
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: adolescent on March 17, 2007, 09:48:34 PM
Quote

AMIGAZ wrote:

Then Warp3D PPC stuff won't run..  :-(


Bummer.  I guess no background for you.  :-D
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 09:53:22 PM
Quote

adolescent wrote:
Quote

AMIGAZ wrote:

Then Warp3D PPC stuff won't run..  :-(


Bummer.  I guess no background for you.  :-D


 :boohoo:   :-D

Life can be a {bleep}  ;-)
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Amigaz on March 17, 2007, 09:54:16 PM
Quote

itix wrote:
Quote

No, it's perfectly normal. Of course, the alternative is that the image is stored in Fast RAM and freshly exposed bits of it copied to the workbench screen's framebuffer as you move windows etc around.


But is it good idea waste 1/4 of precious VRAM to the image?


Yeah, glad I have an A4000 mediator system too which I have 16mb to play with instead of 8  ;-)
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: keropi on March 17, 2007, 10:04:45 PM
it is god's way to punish u Amigaz, for not being online to chat... LOL
Title: Re: 80kb 1024x768 jpeg backdrop draws 2megs of RTG mem???
Post by: Karlos on March 17, 2007, 10:12:45 PM
Quote

itix wrote:
Quote

No, it's perfectly normal. Of course, the alternative is that the image is stored in Fast RAM and freshly exposed bits of it copied to the workbench screen's framebuffer as you move windows etc around.


But is it good idea waste 1/4 of precious VRAM to the image?


Of course not. That's why I prefer a flat-coloured, 16-bit workbench screen ;-)

I should point out that these particular shortcomings are all down to the RTG implementation. Let's face it, under OS3.x Picasso96 and Cybergraphics are both nasty hacks necessitated by the fact that graphics.library is, frankly, diabolical from the point of view of hardware abstraction.

It isn't exactly anybody's fault, it's just the way things panned out.