[idd] rewrite to support DirectX12 copy

idd/LGIdd/CFrameBufferPool.cpp

@@ -0,0 +1,31 @@
+#include "CFrameBufferPool.h"
+#include "CSwapChainProcessor.h"
+
+#include <stdint.h>
+
+void CFrameBufferPool::Init(CSwapChainProcessor * swapChain)
+{
+  m_swapChain = swapChain;
+}
+
+void CFrameBufferPool::Reset()
+{
+  for (int i = 0; i < ARRAYSIZE(m_buffers); ++i)
+    m_buffers[i].Reset();
+}
+
+CFrameBufferResource * CFrameBufferPool::Get(const CIndirectDeviceContext::PreparedFrameBuffer& buffer, size_t minSize)
+{
+  if (buffer.frameIndex > ARRAYSIZE(m_buffers) - 1)
+    return nullptr;
+
+  CFrameBufferResource* fbr = &m_buffers[buffer.frameIndex];
+  if (!fbr->IsValid() || fbr->GetBase() != buffer.mem || fbr->GetSize() < minSize)
+  {
+    fbr->Reset();
+    if (!fbr->Init(m_swapChain, buffer.mem, minSize))
+      return nullptr;
+  }
+
+  return fbr;
+}