On 27 July 2012 20:41, Jeffrey Lee <m...@phlamethrower.co.uk> wrote:
> On Fri, 27 Jul 2012, Andrew Flegg wrote:
>
>> Is there something I've missed which'd allow video scaling (say 2x)
>> for modes < 640x480.
>
> For the X11 port, the place to start looking is the
> SDD_Name(Host_ChangeMode)() function, which is actually implemented in two
> places - X/pseudo.c for pseudocolour displays and X/true.c for truecolour
> displays. As you can see there's code in there to set HD.XScale and
> HD.YScale to take into account rectangular pixel modes. So adding support
> for 2x, 3x, 4x, etc. upscaling is just a case of changing HD.XScale,
> HD.YScale, width, and height to the appropriate values.
Thanks for the pointer. However, I'm getting a weird effect when
XScale > 2. Effectively, it acts like XScale = 1 (although YScale
works).
To reproduce:
1) In true.c's SDD_Name(Host_ChangeMode) add the following after HD.XScale
and HD.YScale are initialised to 1:
int origWidth = width, origHeight = height;
2) Add the following above the calculation of HD.Width and HD.Height:
while (width < 800) {
HD.XScale *= 2;
HD.YScale * =2;
height = origHeight * HD.YScale;
width = origWidth * HD.XScale;
}
3) Make & run `arcem'
In the default mode of 28, this works (although 2x zoom on 640px is a
bit too large for my tastes). Press F12 and enter `wimpmode 13'.
At this point, the vertical scaling is as you'd expect, but despite
HD.YScale being set to 3, and the window being set to the correct
size, the screen display within the window only takes up a third of
the width.
Setting it to a power of 2 doesn't help either.
What happens to 'HD' after its been initialised? What actually does
the pixel blatting and how could this be getting confused with a >2
XScale, but not a >2 YScale?
Cheers,
Andrew
--
Andrew Flegg -- mailto:and...@bleb.org | http://www.bleb.org/
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