Method CopyToFrameBuffer

Rendering/OpenGL2/vtkTextureObject.cxx:2007–2023

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//------------------------------------------------------------------------------
void vtkTextureObject::CopyToFrameBuffer(vtkShaderProgram* program, vtkOpenGLVertexArrayObject* vao)
{
  // the following math really only works when texture
  // and viewport are of the same dimensions
  float minXTexCoord = static_cast<float>(0.5 / this->Width);
  float minYTexCoord = static_cast<float>(0.5 / this->Height);

  float maxXTexCoord = static_cast<float>(static_cast<double>(this->Width - 0.5) / this->Width);
  float maxYTexCoord = static_cast<float>(static_cast<double>(this->Height - 0.5) / this->Height);

  float tcoords[] = { minXTexCoord, minYTexCoord, maxXTexCoord, minYTexCoord, maxXTexCoord,
    maxYTexCoord, minXTexCoord, maxYTexCoord };

  float verts[] = { -1.0f, -1.0f, 0.0f, 1.0f, -1.0f, 0.0f, 1.0f, 1.0f, 0.0f, -1.0f, 1.0f, 0.0f };

  this->CopyToFrameBuffer(tcoords, verts, program, vao);
}

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void vtkTextureObject::CopyToFrameBuffer(int srcXmin, int srcYmin, int srcXmax, int srcYmax,