Hi David,
>> so basically you want to find out how fast you can
>> update blocks of 64 000 pixels
>
> I never said that...
What I mean is that you changed ALL pixels to make
sure to know what the frame rate in the WORST case
is, when ALL 320 x 200 pixels actually need updates.
>> You
You're asking questions about performance so of course the hardware
matters. And it also seems you're choosing a software path that is very
inefficient as well (maybe you're calculating an alpha channel & then
drawing pixels using the BIOS? Hard to tell; you're speaking vaguely). My
suggestion
so basically you want to find out how fast you can
update blocks of 64 000 pixels
I never said that. I wanted to find out why my frame rate was dependent
on the mouse activity.
You probably want to optimize that copying routine.
Game programmers would at least use MMX to do the
alpha checks
Hi David,
so basically you want to find out how fast you can
update blocks of 64 000 pixels, starting at a VSYNC
and if possible taking at most very few VSYNC periods
until the update is done. Assuming ALL pixels change.
> No. In fact, my copying routine is extra slow, because since mode 13h
>
Hello Mr. McMackins,
Indeed. Do you use a fast way of writing the graphics memory,
such as the "string and block processing" Assembly language
commands or at least a library function in the programming
language of your choice which internally uses them?
No. In fact, my copying routine is extra
I said at the very beginning of my first email what hardware I'm using,
but I also said that I'm not just writing this for my own hardware, so
that is really irrelevant.
I'm not sure what this has to do with the topic at all. Yes, I know
about Allegro. Allegro is big and fat, doesn't work on
What hardware are you doing this on? Have you seen Allegro? [0][1]
[0] http://liballeg.org/stabledocs/en/index.html
[1]
https://github.com/liballeg/allegro5/releases/download/v4-2-3-1/all4231.zip
On Thu, Jul 19, 2018 at 5:42 AM David McMackins
wrote:
> > Your definition of "force full redraw"
> Your definition of "force full redraw" sounds odd. What
> should be forced by that? A graphics library? Hardware?
I suppose I'm not explicitly forcing, but since every pixel on the
screen is being changed, it shouldn't be something weird where the
hardware is not actually doing what I ask as an
Hi David,
> I've discovered something weird (to me). I'm on a 1998 Sony Vaio with a
> Pentium 3 processor running FreeDOS 1.2. I have a test program which
> draws 64 full frames to the screen via VGA mode 13h. Each frame is a
> different color to force a full redraw. In addition, I draw a
