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DarkBASIC Professional Discussion / The SYNC command

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Jim
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Posted: 10th Feb 2003 23:46
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Oh My God,

Please can some one tell me how to disable the sync command. Sync off does not work. It seems to be putting invisable sync commands in my loops. As when Sync is enabled I can not get any good speed from my PC. I have written the same programme in MS QBasic and it is faster the DB help meee. The Speed issue is doing my in. Cheers People anything would help me now.
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MrTAToad
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Posted: 11th Feb 2003 00:08
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Try :



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http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!
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the architect
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Posted: 11th Feb 2003 00:11
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Have you downloaded the latest patch. I had some problems with sync until I installed a patch.

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Jim
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Posted: 11th Feb 2003 08:39
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Yes, I have tryed that. All I want to do is disable sync and write my own speed control sub routines etc. Has anyone experenced a simlar problem like me???

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Tywald
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Posted: 11th Feb 2003 09:55
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Jim:
"All I want to do is disable sync and write my own speed control sub routines etc."

If you put MrTAToad´s code in the beginning of your code then the program ONLY updates the screen when it reaches the SYNC command.

For example:

SYNC ON
SYNC RATE 0
DO
-- Lots of code --
SYNC
LOOP

Now the program will update the screen when the end of the loop has been reached.

- Tywald
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Jim
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Posted: 11th Feb 2003 10:31
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Well See if you can get this programme (I know its shit) to run any faster. Do I have to used sync .


Well Can ya?

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Richard Davey
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Posted: 11th Feb 2003 13:05
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Jim - you can (to a certain degree) control the refresh with the code Toad posted - but there is another aspect - your video card will automatically sync itself in order to flush the video memmory. If you keep filling it up by performing operations to it, it will, eventually "sync" *

A better option would be to write your own timer routine, something that syncs when a certain time limit is hit.

Cheers,

Rich
* This is the case in DB anyway, so I'm assuming it's the same in Pro.

"Gentlemen, we are about to short-circuit the Universe!"
DB Team / Atari ST / DarkForge / Retro Gaming
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Jim
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Posted: 11th Feb 2003 13:25
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Your - " your video card will automatically sync itself in order to flush the video memmory. If you keep filling it up by performing operations to it, it will, eventually "sync" *"

Please explain this statement fully.

The Universe has infinite possibilities. So do YOU!
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Richard Davey
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Posted: 11th Feb 2003 13:44
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Try this code:


sync rate 0
sync on

load image "picture.bmp",1

do

paste image 1,0,0

loop


As you can see - there is no SYNC command in this code which means that, technically, you should never see anything display on-screen, right?

That isn't the case in DB though because the fact you're pasting images is filling up the video memory of your graphics card. It can only take so much and eventually it will dump it out (i.e. display it). On my graphics card this takes about 12 seconds to happen.

So as I said before - the advice given here in this thread so far is sound, but you need to bear in mind that the video WILL display whatever it feels like, without you being able to stop it, if you don't look after it with your code (as shown in the code I pasted above).

Cheers,

Rich

"Gentlemen, we are about to short-circuit the Universe!"
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Richard Davey
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Posted: 11th Feb 2003 13:48
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Just tried it in DBPro and glad to say it doesn't do it (well, not for me anyway!)

Cheers,

Rich

"Gentlemen, we are about to short-circuit the Universe!"
DB Team / Atari ST / DarkForge / Retro Gaming
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