Repeat efficiency
- Posted by xerox_irs at lvcm.com
Feb 18, 2003
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I'm making a large z-buffer for a 3d program is dos.
"zbuffer=3Drepeat(repeat(0,1024),768)" --works fast but when I
"zbuffer[y][x]=3Dsomething"--it slows down really bad, probably because =
it allocates a new double every time i do that
I've tried
"zbuffer=3Drepeat(repeat(0,1024),768)+0.0" --takes a minute but makes
"zbuffer[y][x]=3Dsomething" alot faster like multiple times faster
but the problem is that zbuffer must clear every frame.
so something like this still wouldn't work
constant clear_buffer=3Drepeat(repeat(0,1024),768)+0.0
while 1 do
zbuffer=3Dclear_buffer --it would only be fast once !!!!! =
then make the "zbuffer[y][x]=3Dsomething" slow aagain
--do 3d stuff here
end while
can you make the allocating cache bigger to whre if I allocate 8 megs =
then free then it will not need to call the allocateing process for =
every "zbuffer[y][x]=3Dsomething", it would just take up the a part =
8meg.
So euphoria would not give the 8meg back so quitly after allocateing it =
so i could use it quickly.
How should I make the zbuffer ????????
the only possibility is just to inverse the points every time, which =
would slow it down alot
zbuffer=3Drepeat(repeat(0,1024),768)+0.0
while 1 do
zbuffer=3D-zbuffer
--do 3d stuff here
zbuffer=3D-zbuffer
--do inverse 3d stuff here
end while
P.S. I want to keep it all in euphoria, and not use any asm so it can be =
as readable and portable as possible.
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<DIV><FONT face=3DArial size=3D2>I'm making a large z-buffer for a 3d =
program is=20
dos.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>"zbuffer=3Drepeat(repeat(0,1024),768)" =
--works fast=20
but when I</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>"zbuffer[y][x]=3Dsomething"--it slows =
down really=20
bad, probably because it allocates a new double every time i do=20
that</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I've tried</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV>
<DIV><FONT face=3DArial =
size=3D2>"zbuffer=3Drepeat(repeat(0,1024),768)+0.0" --takes a=20
minute but makes</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>"zbuffer[y][x]=3Dsomething" alot faster =
like multiple=20
times faster</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>but the problem is that zbuffer must =
clear every=20
frame.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>so something like this still wouldn't=20
work</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>constant=20
clear_buffer=3Drepeat(repeat(0,1024),768)+0.0</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>while 1 do</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> =20
zbuffer=3Dclear_buffer --it =
would only=20
be fast once !!!!! then make the "zbuffer[y][x]=3Dsomething" slow=20
aagain</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2> --do 3d=20
stuff here</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>end while</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>can you make the allocating cache =
bigger to whre if=20
I allocate 8 megs then free then it will not need to call the =
allocateing=20
process for every "zbuffer[y][x]=3Dsomething", it would just take up the =
a part=20
8meg.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>So euphoria would not give the 8meg =
back so quitly=20
after allocateing it so i could use it quickly.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>How should I make the zbuffer =
????????</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>the only possibility is just to inverse =
the points=20
every time, which would slow it down alot</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial =
size=3D2>zbuffer=3Drepeat(repeat(0,1024),768)+0.0</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>while 1 do</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> =20
zbuffer=3D-zbuffer</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2> --do 3d=20
stuff here</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial size=3D2> =20
zbuffer=3D-zbuffer</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D2> --do=20
inverse 3d stuff here</FONT></DIV>end while</FONT></DIV>
<DIV> </DIV></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>P.S. I want to keep it all in euphoria, =
and not use=20
any asm so it can be as readable and portable as possible.</FONT></DIV>
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