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/*=========================================================================
Program: Visualization Toolkit
Module: vtkGPUVolumeRayCastMapper_MIPFourDependentNoCroppingFS.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 functions used by the 4-component Maximum Intensity
// Projection (MIP) method when cropping is off.
#version 110
float initialMaxValue()
{
return 0.0;
}
vec4 initialColor()
{
return vec4(0.0,0.0,0.0,0.0);
}
void writeColorAndMaxScalar(vec4 color,
vec4 opacity,
float maxValue)
{
// maxValue is not used
// color framebuffer
gl_FragColor.r = color.r*opacity.a;
gl_FragColor.g = color.g*opacity.a;
gl_FragColor.b = color.b*opacity.a;
gl_FragColor.a=opacity.a;
}
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