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DarkBASIC Professional Discussion / What is the backbuffer wdth/height?

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Anomaly452
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Joined: 14th Aug 2011
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Posted: 15th Aug 2011 20:02
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I saw some commands in the help files:



I know that these have to do with the display mode, but what exactly is a backbuffer?

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KISTech
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Joined: 8th Feb 2008
Location: Aloha, Oregon
Posted: 15th Aug 2011 22:02
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If I recall the backbuffer defaults to the same Width, Height, and Depth as your program.

When a game is running it generally does all of it's drawing to the backbuffer. When the time comes to display something to the screen, the backbuffer becomes the display on the screen, and what was on the screen becomes the backbuffer. They flip back and forth so you don't see drawing operations in progress on the screen.

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BatVink
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Joined: 4th Apr 2003
Location: Gods own County, UK
Posted: 16th Aug 2011 00:22
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The Backbuffer width can differ from your screen width, sometimes the hardware adds a few extra bytes of data on the end. If you plan to do any memblock manipulation of the backbuffer, you need to take this into account. It caught me out once and all of my images were skewed as they went down the screen.

I don't know if the backbuffer height can differ.

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WLGfx
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Posted: 16th Aug 2011 01:50
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The Bitmaps "Pitch" will give you the correct spacing between lines. The extra bytes padded onto the end allow for memory alignment and faster manipulation.

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