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Dark GDK / why must use dbSync( ) two times ?

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Can I use VC++ 6 with Dark GDK
16
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Joined: 8th Jan 2008
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Posted: 2nd Mar 2008 14:28
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why ? I must use dbSync( ) two times after I used dbSprite outside
GDK Loop ...

Why must two times ?

oh thanks..
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Sephnroth
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Location: United Kingdom
Posted: 2nd Mar 2008 14:49
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double buffered?


DarkSDK/WinAPI Tutorial
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Can I use VC++ 6 with Dark GDK
16
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Posted: 3rd Mar 2008 04:33
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I don't understand.. please explain to me

dbLoadImage( "bk.bmp", 1, 1 );
dbSprite( 1, 0, 0, 1 );
dbSync( );
dbSync( ); //why ? must use two times for dbSync( )


while( LoopGDK( ) )
{
.....
}
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dark coder
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Posted: 3rd Mar 2008 05:28 Edited at: 3rd Mar 2008 05:29
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Because GDK uses a double bufffered rendering system, look it up. When you run any 3D or 2D commands with dbSyncOn() nothing happens, once you call dbSync() they get drawn to the backbuffer which is not visible to you, the 2nd time you call dbSync() the backbuffer gets flipped to the frontbuffer(what you see) which is why you need to use dbSync() twice to see anything. If you have a loop then you aren't required to use dbSync() at all before it, but it's better practice to.

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Codger
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Joined: 23rd Nov 2002
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Posted: 3rd Mar 2008 05:29
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Like many graphics system Dark GDK draws the graphics on a back buffers.
The system draws all graphics on the back buffer the screen you are watching is the front buffer.

The system switches the buffers every sync.

here is a detailed explaination


http://en.wikipedia.org/wiki/Double_buffering

Codger

ps, you need a sync in the while loop

System
PIV 2.8 MZ 512 Mem
FX 5600 256 mem
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