[Oberon] FPGA - Display.grey pattern

Jörg joerg.straube at iaeth.ch
Mon Sep 3 07:52:48 CEST 2018


The patterns arrow, star, hook, updown, block and cross can be used with CopyPattern()
The patterns Display.grey, GraphicFrames.dotted, GraphicFrames.dotted1 are to be used with ReplPattern()

The bit layout in memory of the two pattern types is different:
- CopyPattern expects    width (byte) height (byte) pattern ((width DIV 8+1)*height bytes)
- ReplPattern expects     32 + height*256 (word) pattern (height words)


> Am 02.09.2018 um 14:05 schrieb Tomas Kral <thomas.kral at email.cz>:
> On Sun, 2 Sep 2018 13:58:17 +0200
> Tomas Kral <thomas.kral at email.cz> wrote:
>> Looking at `Display.Mod' patterns, I see grey pattern makes
>> sense with `ReplConst', to draw 1-bit checker rectangles.
>> But why there is 0000H filling used in pattern definition?
> Ah , sorry. Now I see, wee need to access 32bit pattern lines on
> word addresses. Correct?
> -- 
> Tomas Kral <thomas.kral at email.cz>
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
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