/usr/share/imagevis3d/shaders/GLGridLeaper-Method-2D.glsl is in imagevis3d 3.1.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #version 420 core
layout(binding=2) uniform sampler2D transferFunction;
uniform float fTransScale;
uniform float fGradientScale;
float samplePool(vec3 coords);
vec3 ComputeGradient(vec3 vCenter, vec3 sampleDelta);
vec4 ComputeColorFromVolume(vec3 currentPoolCoords, vec3 modelSpacePosition, vec3 sampleDelta) {
// fetch volume
float data = samplePool(currentPoolCoords);
// compute the gradient
vec3 vGradient = ComputeGradient(currentPoolCoords, sampleDelta);
float fGradientMag = length(vGradient);
// apply 2D transfer function
return texture(transferFunction, vec2(data*fTransScale, 1.0-fGradientMag*fGradientScale));
}
/*
For more information, please see: http://software.sci.utah.edu
The MIT License
Copyright (c) 2012 Interactive Visualization and Data Analysis Group.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
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