OpenGL: Fixed crash after Device restart and reorganized code

We just should call Invalidate() on frame begin

src/Layers/xrRender/R_Backend_Runtime.cpp

@@ -19,21 +19,17 @@ void CBackend::OnFrameEnd()
 {
  if (!GEnv.isDedicatedServer)
  {
-#ifdef USE_OGL
- Invalidate();
-#elif defined(USE_DX10) || defined(USE_DX11)
+#if defined(USE_DX10) || defined(USE_DX11)
  HW.pContext->ClearState();
- Invalidate();
-#else // USE_DX10
-
+#elif defined(USE_DX9)
  for (u32 stage = 0; stage < HW.Caps.raster.dwStages; stage++)
  CHK_DX(HW.pDevice->SetTexture(0, nullptr));
  CHK_DX(HW.pDevice->SetStreamSource(0, nullptr, 0, 0));
  CHK_DX(HW.pDevice->SetIndices(nullptr));
  CHK_DX(HW.pDevice->SetVertexShader(nullptr));
  CHK_DX(HW.pDevice->SetPixelShader(nullptr));
+#endif
  Invalidate();
-#endif // USE_DX10
  }
 }
 
@@ -42,14 +38,20 @@ void CBackend::OnFrameBegin()
  if (!GEnv.isDedicatedServer)
  {
  PGO(Msg("PGO:*****frame[%d]*****", RDEVICE.dwFrame));
-#if defined(USE_DX10) || defined(USE_DX11)
+
+ // DX9 sets base rt and base zb by default
+#ifndef USE_DX9
  Invalidate();
- // DX9 sets base rt nd base zb by default
+
+ // Getting broken HUD hands for OpenGL after calling rmNormal()
+#ifndef USE_OGL
  RImplementation.rmNormal();
+#endif
  set_RT(HW.pBaseRT);
  set_ZB(HW.pBaseZB);
-#endif // USE_DX10
- memset(&stat, 0, sizeof(stat));
+#endif
+
+ ZeroMemory(&stat, sizeof(stat));
  Vertex.Flush();
  Index.Flush();
  set_Stencil(FALSE);