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Last change
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FE/Qt: OSE headers for shaders
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| 1 | /* $Id: splitBGRA.c 35473 2011-01-11 09:02:07Z vboxsync $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * VBox frontends: Qt4 GUI ("VirtualBox"):
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| 5 | * Shader programming for VBoxFBOverlay.
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| 6 | */
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| 7 |
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| 8 | /*
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| 9 | * Copyright (C) 2009-2011 Oracle Corporation
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| 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | */
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| 19 |
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| 20 | float vboxSplitBGRA(vec4 color, float coord)
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| 21 | {
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| 22 | int pix = int(coord);
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| 23 | float part = coord - float(pix);
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| 24 | if(part < 0.25)
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| 25 | return color.b;
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| 26 | if(part < 0.5)
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| 27 | return color.g;
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| 28 | if(part < 0.75)
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| 29 | return color.r;
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| 30 | return color.a;
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| 31 | }
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