On Tue, Nov 12, 2024 at 10:58 AM Jim Hall <jh...@freedos.org> wrote:
>
> Testing on QEMU
[..]
> cirrus:
>
> max color: 320 x 200 @ 256
> max res: 640 x 480 @ 16
>
> *However, I can run another program to test the XRES modes, and I can
> set (and use) 256-color mode, but cannot set XRES 16-color mode. [I'll
> share the XRES test program in a followup email]
>
>
> std:
>
> max color: 320 x 200 @ 256
> max res: 640 x 480 @ 16
>
> *If I run the other program to test XRES modes, I can set both
> 256-color mode and 16-color mode .. but the 16-color mode doesn't
> actually work.
Here's the XRES test program. It sets XRES at 256 colors, and draws a
bunch of color stripes. You can make a 16-color version by changing
_XRES256COLOR to _XRES16COLOR, and changing "color < 256" to "color <
16" and the DIV definition to use 16. At least on my QEMU,
_XRES256COLOR works fine, but _XRES16COLOR can be set but not used (it
generates a bunch of black/white vertical stripes instead).
#include <stdio.h>
#include <conio.h> /* getch */
#include <graph.h>
int main()
{
int color;
/* try highest colors */
if (_setvideomode(_XRES256COLOR) == 0) {
puts("cannot set max color video mode");
return 1;
}
/* print colors */
#define DIV (1024/256)
for (color = 0; color < 256; color++) {
_setcolor(color);
_rectangle(_GFILLINTERIOR, color * DIV, 0, 1023, 767);
}
/* done */
if (getch() == 0) {
getch();
}
_setvideomode(_DEFAULTMODE);
return 0;
}
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