blitz-research
74 lines
2.2 KiB
HTML
74 lines
2.2 KiB
HTML
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<title>Blitz3D Docs</title>
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<link rel=stylesheet href=../css/commands.css type=text/css>
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<h1>UnlockBuffer buffer</h1>
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<h1>Parameters</h1>
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buffer = any valid screen/image buffer (optional)
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<h1>Description</h1>
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After you use LockBuffer on a buffer, the only graphics commands you can use are the read/write pixel commands ReadPixel, WritePixel, ReadPixelFast, and WritePixelFast. You must use this command before using other graphics commands.
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The buffer parameter isn't required. If omitted, the default buffer set with SetBuffer will be used.
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See the other commands for more information.
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See also: <a class=small href=LockedPitch.htm>LockedPitch</a>, <a class=small href=LockedFormat.htm>LockedFormat</a>, <a class=small href=LockedPixels.htm>LockedPixels</a>, <a class=small href=ReadPixelFast.htm>ReadPixelFast</a>, <a class=small href=WritePixelFast.htm>WritePixelFast</a>, <a class=small href=LockBuffer.htm>LockBuffer</a>.
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<h1><a href=../2d_examples/UnlockBuffer.bb>Example</a></h1>
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; High Speed Graphics Commands
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Graphics 640,480,16
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; Draw a bunch of stuff on the screen
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For t= 1 To 1000
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Color Rnd(255),Rnd(255),Rnd(255)
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Rect Rnd(640),Rnd(480),Rnd(150),Rnd(150),Rnd(1)
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Next
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Delay 3000
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; Copy the top half of the screen over the bottom half
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; using fast pixels and locked buffers
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For x = 1 To 640
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For y = 1 To 240
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LockBuffer FrontBuffer()
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WritePixelFast x,y+241,ReadPixelFast(x,y)
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UnlockBuffer FrontBuffer()
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Next
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Next
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Delay 3000
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; Draw the left half of the screen over the right half
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; using the slower direct pixel access
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For x = 1 To 320
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For y = 1 To 480
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WritePixel x+320,y,ReadPixel(x,y)
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Next
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Next
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</td>
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</tr>
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</table>
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<br>
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<a target=_top href=../index.htm>Index</a><br>
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Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=UnlockBuffer&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
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