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C-/C++-Quelltext

// create readback ring
ID3D11Texture2D* m_ReadBackRing[MAX_READBACK_BUFFERS];

for (uint32 i = 0; i < MAX_READBACK_BUFFERS; ++i)
  m_ReadBackRing[i] = CreateStagingTexture(width, height, bpp, ...);

// copy frame to texture
if (RingBufferIsFull()) // wenn der ringpuffer voll ist, also writeindex = readindex
{
  context->Map(m_ReadBackRing[m_CurrentReadIndex], ..., 0, &mappedResource); // CPU stallen bis nächster slot frei wird
  resultReady = true;
}
else
{
  device->CopyResource(frameBuffer, m_ReadBackRing[m_CurrentWriteIndex]); // kopie vom framebuffer anstoßen

  m_CurrentWriteIndex = (m_CurrentWriteIndex + 1) % MAX_READBACK_BUFFERS;

  // readback
  resultReady = context->Map(m_ReadBackRing[m_CurrentReadIndex], ..., D3D11_MAP_FLAG_DO_NOT_WAIT, &mappedResource) != DXGI_ERROR_WAS_STILL_DRAWING;
}

if (resultReady)
{
  memcpy(dest, mappedResource.pData, size);

  m_CurrentReadIndex = (m_CurrentReadIndex + 1) % MAX_READBACK_BUFFERS;
}