[Oberon] paint.mod - support for colours

[Jörg]

Hi

Yes, the HW supports all colors you like.
The VID.v "just" reads the pixels from memory and pushes them (hopefully with correct timing) on the video interface (VGA or HDMI)

But you need memory to store the pixels, and get them out in time :-)
And Display.Mod has to write the pixels to memory in the correct order (and color) so VID.v understands it.

If you want to uses the Oberon system as programming environment, a smaller resolution does not make a lot of sense, as you won't have enough pixels left for your different tracks/windows. You know, programmers love big screens to have all their sources they work on opened and visible in parallel...

br
Jörg

-----Original Message-----
From: Oberon [mailto:oberon-bounces at lists.inf.ethz.ch] On Behalf Of Tomas Kral
Sent: Mittwoch, 30. März 2016 20:00
To: ETH Oberon and related systems <oberon at lists.inf.ethz.ch>
Subject: Re: [Oberon] paint.mod - support for colours

Hi,

Still thinking about Oberon-FPGA colours, while I am no expert on
u-electrocnics.

What if the resolution is decreased to keep the same memory buffer, and
perhaps make the bigger point size then (= twin, quad pixels). I am led
to believe this would be similar to ATARI ST / Sinclair QL, the higher
resolution the fewer colours, and vice versa? Or am I thinking of
something silly and complicated?

In Pepino-Oberon VID file, there is a change from 3-bit to 8-bit video,
does this mean that H/W already support more colours?

Many thanks.
Tomas  
-- 
Tomas Kral <thomas.kral at email.cz>

On Mon, 2016-03-28 at 13:24 -0700, Magnus Karlsson wrote:
> Also, the video circuit is stalling the processor when it needs to 
> access memory.  Today with 1 bit/pixel it is stalling the processor 
> 9.375% of the time.
> If you adapt the hardware to say 4 bits/pixel then it would stall the 
> processor 37.5% of the time.
> 
> Magnus
> 
> On 3/28/2016 12:13 PM, Jörg Straube wrote:
> > Tom
> > Having more than two colors needs at least the following
> > - adapt the Verilog code VID.v
> > - adapt Display.Mod
> >
> > For 4 colours, you obviously need double the video memory than today (today= 98304 byte = 9.3% of total memory)
> >
> > I think for a colour display it would be best to have more than 1 MB of memory.
> >
> > Jörg
> >
> >
> >
> > Gruss. Jörg
> >> Am 28.03.2016 um 20:45 schrieb Tomas Kral <thomas.kral at email.cz>:
> >>
> >> Hi,
> >>
> >> Thank you, I would like to try on Oberon FPGA Station.
> >>
> >> I am also interested in the original pictures and Paint.Tool. Not sure
> >> if these are preserved somewhere?
> >>
> >> Grapes.Pict Eschew.Pict New.Pict Clown.Pict Clown16.Pict
> >> Paint.Tool
> >>
> >> I am led to believe FPGA is currently configured for two-colour Display
> >> buffer, it would be therefore interesting to experiment with more
> >> colours, if at all could be supported by the chip.
> >>
> >> Many thanks so far.
> >>
> >>
> >> -- 
> >> Tomas Kral <thomas.kral at email.cz>
> >>
> >>> On Fri, 2016-03-25 at 12:48 +0100, scrutinizer wrote:
> >>> paint.mod attached
> >>> let me know if you need some sample .pict files
> >>>
> >>>> Date: Thu, 24 Mar 2016 21:26:47 +0100
> >>>> From: Tomas Kral <thomas.kral at email.cz>
> >>>> To: oberon at lists.inf.ethz.ch
> >>>> Subject: [Oberon] Oberon Paint.Mod
> >>>>
> >>>> Hi,
> >>>>
> >>>> I am curious about drawing programs for Oberon system as I am reading
> >>>> PO.Applications chapter, describing Draw.Tool implementation.
> >>>>
> >>>> I have also seen a Clown picture at
> >>>> https://en.wikipedia.org/wiki/Oberon_%28operating_system%29
> >>>>
> >>>> It shows Paint.Tool commands apparently coming from a Paint.Mod
> >>>>
> >>>> Paint.Mod does not seem part of Oberon System, I am just curious where
> >>>> it originates?
> >>>>
> >>>> Cheers Tom
> >>> --
> >>> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> >>> https://lists.inf.ethz.ch/mailman/listinfo/oberon
> >> --
> >> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> >> https://lists.inf.ethz.ch/mailman/listinfo/oberon
> > --
> > Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> > https://lists.inf.ethz.ch/mailman/listinfo/oberon
> 
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