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- To: Coordination of admins/developers of the game programming library Allegro <alleg-developers@xxxxxxxxxx>
- Subject: Re: [AD] Examples, current SVN
- From: Evert Glebbeek <eglebbk@xxxxxxxxxx>
- Date: Sat, 14 Mar 2009 12:16:08 -0700
On 14 Mar 2009, at 11:05 , Elias Pschernig wrote:
It is intended, but the example probably should be changed.
Or clarified. ;)
ex_membmp - the memory bitmap doesn't show up, all I see is a
diagonal
line textured with the bitmap it's supposed to show.
It works here in Linux, but it's running only at about 1% of the speed
of the accelerated version.
That's what it used to do in OS X as well, in other words, the
breakage occurred somewhat recently.
Any ideas where I should start looking?
The 4 boxes horizontally/vertically are drawn on fractional pixel
positions:
0.00 0.25 0.50 0.75
Without super-sampling, the rasterizer has to make a choice which
pixels
to "light" - and as it seems, some HW makes odd choices. As does our
current software rasterization. If you edit the generated ex_draw.cfg,
you can enable super-sampling (change samples=0 to samples=4) to see
how
OpenGL uses this.
I figured it had something to do with rounding issues. I'll play with
the multi-sampling and see how that affects things.
Yeah, we compared screenshots in IRC the other day, this is how it
looks
here with my current NVidia's rasterizer:
It looks similar for me.
ex_expose - all I get now is a blank (white) window; this might be an
OS X problem.
Works here in X11.
Hrm...
It used to display the bitmap properly (but it never seemed to
generate "expose" events). I'll look into this as well.
Evert