@kitware/vtk.js/Rendering/OpenGL/SurfaceLIC/glsl/vtkLineIntegralConvolution2D_AAH.glsl.js

Visualization Toolkit for the Web

var vtkLineIntegralConvolution2D_AAH = "//VTK::System::Dec\n\n//=========================================================================\n//\n//  Program:   Visualization Toolkit\n//  Module:    vtkLineIntegralConvolution2D_AAH.glsl\n//\n//  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen\n//  All rights reserved.\n//  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.\n//\n//     This software is distributed WITHOUT ANY WARRANTY; without even\n//     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR\n//     PURPOSE.  See the above copyright notice for more information.\n//\n//=========================================================================\n\n// Anti-alias stage in vtkLineIntegralConvolution2D\n// horizontal pass of a Gaussian convolution\n\n// the output of this shader\nlayout(location = 0) out vec4 LICOutput;\nlayout(location = 1) out vec4 SeedOutput;\n\nuniform sampler2D texLIC; // input texture\nuniform float     uDx;    // fragment size\n\nin vec2 tcoordVC;\n\n// factored 3x3 Gaussian kernel\n// K^T*K = G\nfloat K[3] = float[3](0.141421356, 0.707106781, 0.141421356);\n\n// determine if the fragment was masked\nbool Masked(float val){ return val != 0.0; }\n\nvoid main(void)\n{\n// neighbor offsets\nvec2 fragDx[3] = vec2[3](vec2(-uDx,0.0), vec2(0.0,0.0), vec2(uDx,0.0));\n\n  vec2 lictc = tcoordVC.st;\n  vec4 lic[3];\n  bool dontUse = false;\n  float conv = 0.0;\n  for (int i=0; i<3; ++i)\n    {\n    vec2 tc = lictc + fragDx[i];\n    lic[i] = texture2D(texLIC, tc);\n    dontUse = dontUse || Masked(lic[i].g);\n    conv = conv + K[i] * lic[i].r;\n    }\n  // output is (conv, mask, skip, 1)\n  if (dontUse)\n    {\n    LICOutput = vec4(lic[1].rg, 1.0, 1.0);\n    }\n  else\n    {\n    LICOutput = vec4(conv, lic[1].gb, 1.0);\n    }\n  SeedOutput = vec4(0.0, 0.0, 0.0, 0.0);\n}\n";

export { vtkLineIntegralConvolution2D_AAH as v };