DOS ain't dead - Jordan Hargraphix SvgaBGI goes MIT license

Jordan Hargraphix SvgaBGI goes MIT license (Announce)

posted by Khusraw , Bucharest, Romania, 24.12.2020, 11:25
(edited by Khusraw on 24.12.2020, 12:18)

> Not yet. Just started looking at it and applying tight changes. Mainly
> enabling it to build with TASM 5 too. Of course you can fork it or submit a
> patch.

Unfortunately I don't have time now to contribute with a patch and, to be honest, my interest in it is quite low, but the problem arises from the fact that it uses "MaxX" instead of "BytesPerLine" in the calculations needed to get the video offset (and bank). You can see a couple of examples (taken at random) below, "MaxX" should be replaced with "BytesPerLine" to make it work properly in cases where the number of bytes per scan line is larger than the width in pixels (I have a couple of video cards that make the problem obvious in mode 800x600).

PROC PutPixel add bx, [PageOfs] ; Bildschirmseiten-Korrektur mov cl, dl ; Farbe retten xchg ax, bx ; Y in ax, X in bx mul [MaxX] ; * Zeilenl„nge add bx, ax ; + Offset adc dl, 0 ; Segment-šberlauf mov [Seg64], dl ; Segment merken call [SegSelect] ; Segment einstellen mov ds, [VideoSeg] ; Videosegment holen mov [bx], cl ; Byte schreiben ret ENDP PutPixel

PROC RestoreBitmap NEAR [...] ; Errechnen wieviel bei Erreichen des Punktes X2+1 dazugez„hlt werden muá um ; X1 in der n„chsten Linie zu erreichen mov cx, [MaxX] sub cx, ax push cx ; Wert retten [...] ENDP RestoreBitMap

---
Glory to God for all things

Post reply

Complete thread:

Jordan Hargraphix SvgaBGI goes MIT license - rr, 19.12.2020, 14:58 (Announce)
- Jordan Hargraphix SvgaBGI goes MIT license - DosWorld, 19.12.2020, 15:25
  - Jordan Hargraphix SvgaBGI goes MIT license - RayeR, 19.12.2020, 19:07
  - Jordan Hargraphix SvgaBGI goes MIT license - marcov, 21.12.2020, 14:40
    - Jordan Hargraphix SvgaBGI goes MIT license - DosWorld, 22.12.2020, 15:40
      - Jordan Hargraphix SvgaBGI goes MIT license - marcov, 22.12.2020, 22:49
- Jordan Hargraphix SvgaBGI goes MIT license - Guti, 21.12.2020, 09:51
  - Jordan Hargraphix SvgaBGI goes MIT license - Guti, 23.12.2020, 16:48
    - Jordan Hargraphix SvgaBGI goes MIT license - Khusraw, 23.12.2020, 18:40
      - Jordan Hargraphix SvgaBGI goes MIT license - Guti, 24.12.2020, 08:46
        Jordan Hargraphix SvgaBGI goes MIT license - Khusraw, 24.12.2020, 11:25
        Jordan Hargraphix SvgaBGI goes MIT license - Guti, 24.12.2020, 12:28
        Jordan Hargraphix SvgaBGI goes MIT license - Khusraw, 24.12.2020, 12:46