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//=========================================================================
//
// Program: ParaView
// Module: vtkVisibleLinesPainter_fs.glsl
//
// Copyright (c) Kitware, Inc.
// All rights reserved.
// See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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.
//
//=========================================================================
// Id: Id
uniform sampler2D texDepth;
uniform vec2 uViewSize;
varying vec4 vColor;
const vec2 threshold = vec2(0.00001, 0.005);
void main (void)
{
float surfaceDepth = texture2D(texDepth, gl_FragCoord.xy/uViewSize).x;
// tolerance increases as depth increases, this ensures that the lines appear
// smooth and continuous.
float tolerance = threshold.x + (1.0 - gl_FragCoord.z) * (threshold.y - threshold.x);
if (surfaceDepth+tolerance < gl_FragCoord.z)
{
discard;
}
gl_FragColor = vColor;
}
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