From: Ryan Rubley (rubleyr@csis.gvsu.edu)
Date: Thu 29 Nov 2001 - 16:35:09 IST
vga palette registers are 6bit (0-63)
just <<2 or *4 the results if you need to
On Thu, 29 Nov 2001, gaw zay wrote:
> On Wed, 28 Nov 2001, Jay Link wrote:
>
> > > Are there any functions to get rgb values of these 16 basic colors is my
> > > question, I guess. (or a way to decode gl_getpixelrgb() when using these?)
> >
> > I hacked this a while ago, using vga_setcolor() and vga_drawpixel() to put
> > the 16 basic colors on the screen, and then gl_getpixelrgb() to read the
> > RGB values. Be sure to call gl_setrgbpalette() first.
>
> well I did try calling gl_setrgbpalette() and reading with gl_getpixelrgb()
> but all on screen colors turn blue (the snapshot is blue, too) I checked the
> ppm in vim and all 'r' fields are "0" and if I recall the BLUE was "0 0 128",
> GREEN "0 32 64", and RED "0 0 64" (these are all from memory, they are
> probably not 100% accurate, I can't recall what WHITE was possible "0 0 32")
>
> This is what I meant by "decoding gl_getpixelrgb()" above, if I DON'T call
> gl_setrgbpalette() the screen stays normal and the screen shot is all shades
> of blue, I didn't see any obvious bit pattern to try processing.
>
> Is this considered a bug that the screen colors turn blue for me? Or is it
> expected behaviour when called with a
> vga_setmode/gl_setcontextvga(G320x200x256) screen res/depth?
>
> thanks for the color chart, the snapshots look good!
>
> brian
>
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