splitBGRA.c revision 3e1c4447f9ae4b44caf72d405973bd68e34a21d1
/* $Id$ */
/** @file
*
* VBox frontends: Qt4 GUI ("VirtualBox"):
* Shader programming for VBoxFBOverlay.
*/
/*
* Copyright (C) 2009-2011 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
float vboxSplitBGRA(vec4 color, float coord)
{
int pix = int(coord);
float part = coord - float(pix);
if(part < 0.25)
return color.b;
if(part < 0.5)
return color.g;
if(part < 0.75)
return color.r;
return color.a;
}