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/*=========================================================================
Program: Visualization Toolkit
Module: vtkGPUVolumeRayCastMapper_CompositeCroppingFS.glsl
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// Implementation of some function used by the composite method when cropping
// is on.
#version 110
// color buffer as an input
uniform sampler2D frameBufferTexture;
// 2D Texture fragment coordinates [0,1] from fragment coordinates
// the frame buffer texture has the size of the plain buffer but
// we use a fraction of it. The texture coordinates is less than 1 if
// the reduction factor is less than 1.
vec2 fragTexCoord;
vec4 initialColor()
{
return texture2D(frameBufferTexture,fragTexCoord);
}
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