OpenEuphoria

VESA20.e

• Posted by Pete Eberlein <xseal at HARBORSIDE.COM> May 10, 1999
• 473 views

> Hi,
>
> I have looked over the Eu site and can not find vesa20.e any where...
> Where is it at??? Thanx
>
> The blind Grape

Currently it's only available from my site:

http://www.harborside.com/home/x/xseal/euphoria/

I haven't asked Rob to link to it yet, because I didn't realize how many
people would find it more useful than Neil.  I've added some bitmap
scaling routines and I still need to fix up the vesa_mode routine for
better compatibility.


> I noticed in vesa20.e that it has a list of graphics modes, for in case
> the ROM didn't, would those numbers work with graphics.e's
> graphics_mode()?
>
> Thanks,
> Mike Hurley

Only the 8-bit-per-pixel modes. (see also /euphoria/include/graphics.e)


> Would it be possible to copy/base a virtual graphics copying routine
> off of the info stored in VESA20.E?  I mean like how it sets up banking
> or linear and that kind of stuff.

I guess I'm still a little unclear on what you want to do here...

> On another track, is there any reason that VESA20.E's vesa_mode()
> doesn't work with 16-color modes? (What would the bit-depth be for that
> anyway? 4? 2?)

4, but you're on your own for doing raw video memory access (planar mode
really sucks, trust me)

> I'm gonna try to base a routine off of VESA20.E, but I'll listen to
> anybody's suggestions on the topic.
>
> Thanks all, I know I'm sounding repetative,
> Mike Hurley


> 1) I know that 65k means 65,000, and that 16.7M means 16,700,000, but
> in terms of number of colors in a graphics mode, is 65k literally
> 65,000, or 16.7M literally 16,700,000?  I would like to know so I can
> incorporate it into my graphics library...which I now am finished with
> the 'rough draft,' and am now writing the demo programs for it.  Any
> help is appreciated, it's just that computer numbers can be tricky.
> With 1 Kb actually being 1024 bytes and all.

64k = 65536  --  16-bit color = 2^16
16.7M = 16777216  -- 24-bit color = 2^24

> 2) Is there any way to read a 24-bit bitmap/image under DOS with
> current libraries?  I'm thinking of adding 24-bit support to my
> library.

Neil reads 24-bit .bmp files..
TrueColr reads 24-bit .tga...
Al Getz wrote a jpeg decompressor

Later,
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xseal at harborside.com  ICQ:13466657