Method AllocateDepth

Rendering/OpenGL2/vtkTextureObject.cxx:1786–1839

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkTextureObject::AllocateDepth(unsigned int width, unsigned int height, int internalFormat)
{
  assert("pre: context_exists" && this->GetContext() != nullptr);
  assert(
    "pre: valid_internalFormat" && internalFormat >= 0 && internalFormat < NumberOfDepthFormats);

#ifdef glTexImage2DMultisample
  this->Target = (this->Samples ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D);
#else
  this->Target = GL_TEXTURE_2D;
#endif

  this->Format = GL_DEPTH_COMPONENT;

  // Try to match vtk type to internal fmt
  if (!this->Type)
  {
    this->Type = OpenGLDepthInternalFormatType[internalFormat];
  }

  if (!this->InternalFormat)
  {
    this->InternalFormat = OpenGLDepthInternalFormat[internalFormat];
  }

  this->Width = width;
  this->Height = height;
  this->Depth = 1;
  this->NumberOfDimensions = 2;
  this->Components = 1;

  this->Context->ActivateTexture(this);
  this->CreateTexture();
  this->Bind();

#ifdef glTexImage2DMultisample
  if (this->Samples)
  {
    glTexImage2DMultisample(this->Target, this->Samples, static_cast<GLint>(this->InternalFormat),
      static_cast<GLsizei>(this->Width), static_cast<GLsizei>(this->Height), GL_TRUE);
  }
  else
#endif
  {
    glTexImage2D(this->Target, 0, static_cast<GLint>(this->InternalFormat),
      static_cast<GLsizei>(this->Width), static_cast<GLsizei>(this->Height), 0, this->Format,
      this->Type, nullptr);
  }

  vtkOpenGLCheckErrorMacro("failed at glTexImage2D");

  this->Deactivate();
  return true;
}

bool vtkTextureObject::AllocateDepthStencil(unsigned int width, unsigned int height)
{