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Date: Thu, 1 May 1997 07:05:21 -0400
From: Randall Hopper <rhh@ct.picker.com>
To: Doug White <dwhite@resnet.uoregon.edu>
Cc: multimedia@freebsd.org
Subject: Re: Updated driver (bt848-970424)
References: <19970430182138.01236@ct.picker.com> <Pine.BSF.3.96.970430203020.409A-100000@localhost>
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Doug White:
 |>| Rating  Class        bpp  Bpp  R,G,B Masks                   Swap  DirectV
 |>|   4     TrueColor     24   4   000000ff, 0000ff00, 00ff0000   --      No 
 |
 |I can live with the switch, just not Ximages.  This is in 24 bit mode, a
 |mode I don't use because I can only cram 800x600 in 2mb of vram.  I need
 |my desktop real estate!  :)

Right, I sure agree there.  Up until two weeks ago, I was in the same boat
(2 Meg).

 |> Before I put the smart swapping in, let me verify with you though that
 |> when you turn byte and word swapping off for your 4Bpp 24bpp video
 |> mode, you "are" getting direct video, right?  That is, it's not giving
 |> you:
 |
 |No, sorry Houston...  I get ximages mode in 24 bit regardless of the
 |switch settings. The switches primarily control if the color is correct or
 |not. 

Ahhh, I think I know what's going on now.  The Bt's 4Bpp format w/ no byte
swapping is: ARGB.  With byte swapping, you get access to BGRA, GBAR, and
RABG.  According to your visual's RGB masks (RGB: 0000FF,00FF00,FF0000) and
display frame buffer depth (4Bpp), seems you need an ABGR ordering.  The Bt
can't do it, thus the drop-back to X images.  Sorry about that.

If the Mach64 server support changing the pixel component ordering for that
4Bpp/24bpp mode to ARGB (I know the chip supports it at least), that should
get you going there.  Otherwise 15/16bpp might be your best option.

Randall