Method AddAttributeArrayWithDivisor

Rendering/OpenGL2/vtkOpenGLVertexArrayObject.cxx:249–356

}

bool vtkOpenGLVertexArrayObject::AddAttributeArrayWithDivisor(vtkShaderProgram* program,
  vtkOpenGLBufferObject* buffer, const std::string& name, int offset, size_t stride,
  int elementType, int elementTupleSize, bool normalize, int divisor, bool isMatrix)
{
  if (!program)
  {
    vtkErrorMacro("attempt to add attribute without a program for attribute " << name);
    return false;
  }

  // Check the program is bound, and the buffer is valid.
  if (!program->isBound())
  {
    vtkErrorMacro("attempt to add attribute without a bound program for attribute " << name);
    return false;
  }

  if (buffer->GetHandle() == 0)
  {
    vtkErrorMacro("attempt to add attribute without a handleless buffer for attribute " << name);
    return false;
  }

  if (buffer->GetType() != vtkOpenGLBufferObject::ArrayBuffer)
  {
    vtkErrorMacro("attempt to add attribute without an array buffer for attribute " << name);
    return false;
  }

  // Perform initialization if necessary, ensure program matches VAOs.
  if (this->Internal->HandleProgram == 0)
  {
    this->Internal->HandleProgram = static_cast<GLuint>(program->GetHandle());
  }
  if (!this->Internal->IsReady() ||
    this->Internal->HandleProgram != static_cast<GLuint>(program->GetHandle()))
  {
    vtkErrorMacro("attempt to add attribute when not ready for attribute " << name);
    return false;
  }

  const GLchar* namePtr = static_cast<const GLchar*>(name.c_str());
  VertexAttributes attribs;
  attribs.Index = program->FindAttributeArray(namePtr);
  attribs.Offset = offset;
  attribs.Stride = static_cast<GLsizei>(stride);
  attribs.Type = convertTypeToGL(elementType);
  attribs.Size = elementTupleSize;
  attribs.Normalize = normalize;
  attribs.IsMatrix = isMatrix;
  attribs.Divisor = divisor;

  if (attribs.Index == -1)
  {
    vtkErrorMacro("attempt to add attribute not found in program for attribute " << name);
    return false;
  }