Method ReplaceShaderPositionVC

Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx:2379–2419

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//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderPositionVC(
  std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer*, vtkActor* actor)
{
  std::string VSSource = shaders[vtkShader::Vertex]->GetSource();
  std::string GSSource = shaders[vtkShader::Geometry]->GetSource();
  std::string FSSource = shaders[vtkShader::Fragment]->GetSource();

  vtkShaderProgram::Substitute(
    FSSource, "//VTK::Camera::Dec", "uniform int cameraParallel;\n", false);

  // do we need the vertex in the shader in View Coordinates
  bool isLightingUsed =
    this->PrimitiveInfo[this->LastBoundBO].LastLightComplexity != primitiveInfo::NoLighting;
  if (isLightingUsed || this->DrawingTubes(*this->LastBoundBO, actor))
  {
    vtkShaderProgram::Substitute(VSSource, "//VTK::PositionVC::Dec", "out vec4 vertexVCVSOutput;");
    vtkShaderProgram::Substitute(VSSource, "//VTK::PositionVC::Impl",
      "vertexVCVSOutput = MCVCMatrix * vertexMC;\n"
      "  gl_Position = MCDCMatrix * vertexMC;\n");
    vtkShaderProgram::Substitute(VSSource, "//VTK::Camera::Dec",
      "uniform mat4 MCDCMatrix;\n"
      "uniform mat4 MCVCMatrix;");
    vtkShaderProgram::Substitute(GSSource, "//VTK::PositionVC::Dec",
      "in vec4 vertexVCVSOutput[];\n"
      "out vec4 vertexVCGSOutput;");
    vtkShaderProgram::Substitute(
      GSSource, "//VTK::PositionVC::Impl", "vertexVCGSOutput = vertexVCVSOutput[i];");
    vtkShaderProgram::Substitute(FSSource, "//VTK::PositionVC::Dec", "in vec4 vertexVCVSOutput;");
    vtkShaderProgram::Substitute(
      FSSource, "//VTK::PositionVC::Impl", "vec4 vertexVC = vertexVCVSOutput;");
  }
  else
  {
    vtkShaderProgram::Substitute(VSSource, "//VTK::Camera::Dec", "uniform mat4 MCDCMatrix;");
    vtkShaderProgram::Substitute(
      VSSource, "//VTK::PositionVC::Impl", "  gl_Position = MCDCMatrix * vertexMC;\n");
  }
  shaders[vtkShader::Vertex]->SetSource(VSSource);
  shaders[vtkShader::Geometry]->SetSource(GSSource);
  shaders[vtkShader::Fragment]->SetSource(FSSource);
}

//------------------------------------------------------------------------------
void vtkOpenGLPolyDataMapper::ReplaceShaderPrimID(