Re: [Xpert]Trouble with DGA and MAME

[Jeremy Sugerman]

In article  [EMAIL PROTECTED]
writes:
>>I'm assuming they're not using Xlib to render and this is root-mode
>>DGA where they are touching the framebuffer.  I've attached one of
>>my original DGA 2.0 test apps.  If it works fine for you then it's
>>probably the case that there's nothing wrong with the "mga" driver's
>>DGA support.  This app will pretty much test every mode advertised.
>>
>>  Mark.
>
>Ok, your test program has some pretty odd behavior on my machine. 

Try not using the mga_hal_drv.o module from Matrox (assuming you're using
it).  Every version of it I've been able to try breaks DGA2 nicely on my
G400.  In single headed mode, the driver still offers all of the normal DGA2
modes, but no matter which the client requests, it always switches to the
same width, height, and pitch as the root window without any feedback to the
client that its DGA request was only half honoured.  In dualhead mode, it
also silently throws away all accelerated DGA fills, even though the flags
for both the requested and acutally used DGA2 mode indicate support.  I
poked around Matrox's web site for a while trying to find a useful way to
report my problems and offer a simple test program, but eventually gave up.

Yours,
Jeremy.
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Re: [Xpert]Trouble with DGA and MAME

[James Farwell]

>
>
>I'm assuming they're not using Xlib to render and this is root-mode
>DGA where they are touching the framebuffer.  I've attached one of
>my original DGA 2.0 test apps.  If it works fine for you then it's
>probably the case that there's nothing wrong with the "mga" driver's
>DGA support.  This app will pretty much test every mode advertised.
>
>   Mark.

Mark,

Ok, your test program has some pretty odd behavior on my machine. 
First off, it seems to always be drawing multiple cubes, for example 
in mode #44 640 x 480, bpp = 32, depth = 24, pitch 2560 bytes I get 2 
distinct cubes in the top and bottom half of the screen.  In 
640x480x16 I get the same pallete ugliness that I see in MAME. 
Secondly, there seems to be some sort of residual image of my desktop 
that when I move my mouse it alternates between images of the cubes 
and the residual image, producing a flickering.  I am assuming this 
is not normal behavior :)

- James



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Re: [Xpert]Trouble with DGA and MAME

[James Farwell]

Mark,

Hmm, the sections aren't really half-height, more like 1/3 height 
including about an inch border surrounding them.  However, this could 
be because MAME reports the game resolution is 304x224 and DGA is 
displaying in 640x480.  To test your theory I tried running MAME with 
the horiz/vert rez scaled to 2, and this time it reported a 608x672 
resolution and switched DGA to 1024x768.  However, this time there 
were more than just 2 sections at the top of the screen, there were 
like 4 different overlapping sections.  Does this fit with your 
theory?  If so, I'll go bug the mame people :)  Thanks a bunch!

- James

>On Sat, 17 Nov 2001, James Farwell wrote:
>
>>  Greetings,
>>
>>  I have recently been trying to run MAME in fullscreen mode using
>>  XFree86 4.1.0 on a Matrox G550.  MAME works great in a window, but
>>  when I try to fullscreen it DGA 2.0 starts up, it kicks in to
>>  640x480x16 mode, but then instead of MAME filling the screen it shows
>>  up in *2*  little sections at the top of screen, where the left
>>  section seems to contain every other scanline, and the right section
>>  seems to contain the missing scanlines.  The pallete is also mangled
>>  pretty horridly and seems to consist primarily of black, white, cyan,
>>  magenta, and green.  I have no idea if this is a problem with my MAME
>>  or DGA or what.  Does anyone know what could be the problem or how I
>>  would go about testing things to find what might be the problem?
>>  Thanks!
>
>Sounds like Mame is trying to draw 320x240 on a 640x480 surface,
>hence the to half-height sections side-by-side.  Sounds like a MAME
>issue.
>
>
>   Mark.


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Re: [Xpert]Trouble with DGA and MAME

[Mark Vojkovich]

On Sat, 17 Nov 2001, James Farwell wrote:

> Greetings,
> 
> I have recently been trying to run MAME in fullscreen mode using 
> XFree86 4.1.0 on a Matrox G550.  MAME works great in a window, but 
> when I try to fullscreen it DGA 2.0 starts up, it kicks in to 
> 640x480x16 mode, but then instead of MAME filling the screen it shows 
> up in *2*  little sections at the top of screen, where the left 
> section seems to contain every other scanline, and the right section 
> seems to contain the missing scanlines.  The pallete is also mangled 
> pretty horridly and seems to consist primarily of black, white, cyan, 
> magenta, and green.  I have no idea if this is a problem with my MAME 
> or DGA or what.  Does anyone know what could be the problem or how I 
> would go about testing things to find what might be the problem? 
> Thanks!

   Sounds like Mame is trying to draw 320x240 on a 640x480 surface,
hence the to half-height sections side-by-side.  Sounds like a MAME
issue.


Mark.

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[Xpert]Trouble with DGA and MAME

[James Farwell]

Greetings,

I have recently been trying to run MAME in fullscreen mode using 
XFree86 4.1.0 on a Matrox G550.  MAME works great in a window, but 
when I try to fullscreen it DGA 2.0 starts up, it kicks in to 
640x480x16 mode, but then instead of MAME filling the screen it shows 
up in *2*  little sections at the top of screen, where the left 
section seems to contain every other scanline, and the right section 
seems to contain the missing scanlines.  The pallete is also mangled 
pretty horridly and seems to consist primarily of black, white, cyan, 
magenta, and green.  I have no idea if this is a problem with my MAME 
or DGA or what.  Does anyone know what could be the problem or how I 
would go about testing things to find what might be the problem? 
Thanks!

- James Farwell
[EMAIL PROTECTED]
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