D3D: Remove BeginFrame/EndFrame

These functions did not do anything anyway. There is also no need to
present the backbuffer when shutting down.

Source/Core/VideoBackends/D3D/D3DBase.cpp

@@ -52,8 +52,6 @@ const D3D_FEATURE_LEVEL supported_feature_levels[NUM_SUPPORTED_FEATURE_LEVELS] =
 
 unsigned int xres, yres;
 
-bool bFrameInProgress = false;
-
 HRESULT LoadDXGI()
 {
   if (dxgi_dll_ref++ > 0)
@@ -602,27 +600,6 @@ void Reset()
   SetDebugObjectName(backbuf->GetRTV(), "backbuffer render target view");
 }
 
-bool BeginFrame()
-{
-  if (bFrameInProgress)
-  {
-    PanicAlert("BeginFrame called although a frame is already in progress");
-    return false;
-  }
-  bFrameInProgress = true;
-  return (device != nullptr);
-}
-
-void EndFrame()
-{
-  if (!bFrameInProgress)
-  {
-    PanicAlert("EndFrame called although no frame is in progress");
-    return;
-  }
-  bFrameInProgress = false;
-}
-
 void Present()
 {
   UINT present_flags = 0;

Source/Core/VideoBackends/D3D/D3DBase.h

@@ -63,8 +63,6 @@ extern HWND hWnd;
 extern bool bFrameInProgress;
 
 void Reset();
-bool BeginFrame();
-void EndFrame();
 void Present();
 
 unsigned int GetBackBufferWidth();

Source/Core/VideoBackends/D3D/Render.cpp

@@ -81,14 +81,11 @@ Renderer::Renderer() : ::Renderer(D3D::GetBackBufferWidth(), D3D::GetBackBufferH
   D3D11_VIEWPORT vp = CD3D11_VIEWPORT(0.f, 0.f, (float)m_target_width, (float)m_target_height);
   D3D::context->RSSetViewports(1, &vp);
   FramebufferManager::BindEFBRenderTarget();
-  D3D::BeginFrame();
 }
 
 Renderer::~Renderer()
 {
   TeardownDeviceObjects();
-  D3D::EndFrame();
-  D3D::Present();
   D3D::Close();
 }
 
@@ -607,7 +604,6 @@ void Renderer::SwapImpl(AbstractTexture* texture, const EFBRectangle& xfb_region
   Renderer::DrawDebugText();
 
   OSD::DrawMessages();
-  D3D::EndFrame();
 
   g_texture_cache->Cleanup(frameCount);
 
@@ -668,7 +664,6 @@ void Renderer::SwapImpl(AbstractTexture* texture, const EFBRectangle& xfb_region
 
   // begin next frame
   RestoreAPIState();
-  D3D::BeginFrame();
   FramebufferManager::BindEFBRenderTarget();
   SetViewport();
 }