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From: Alexander Larsson <alla@lysator.liu.se>
To : ggi-develop@eskimo.com
Date: Sun, 12 Jul 1998 20:24:25 +0200
Frames...
I was bored for a second and thought that i should port the newly released
snes9x to ggi, but then i realized that libggi was in for a bit of change
right now...
So i decided to implement Frames in libggi according to 2.9 in
libggi-issues.txt. I have just begun looking at it, thinking i could start
with the X-target, but i immediately found a problem that can possible break a
lot of things..
The linear libraries does a lot of stuff like this:
*(((uint16 *)LIBGGI_FB_LINEAR(vis))+y*LIBGGI_FB_WIDTH(vis)+x)=col;
and
*pixel=*(((uint16 *)LIBGGI_FB_LINEAR(vis))+y*LIBGGI_FB_WIDTH(vis)+x);
This is all nice and dandy with the current implementations, but according to
the following from libggi-issues.txt it is wrong:
o Three additional functions are required, to switch between these
frames for drawing, reading back (ggiGet*) and for displaying,
e.g.:
o ggiSetDisplayFrame(vis, int frameno);
o ggiSetWriteFrame(vis, int frameno);
o ggiSetReadFrame(vis, int frameno);
This gives a problem. I must have to pointers to the linear buffer, one for
reading and one for writing to make this possible.
This calls for a change in ggi_info_fb, split 'linear' into linear_read and
linear_write. Also the LIBGGI_FB_LINEAR(vis) macro needs to be split into two.
This will mean binary incompatibility...
What shall i do?
/ Alex
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