D3D: Add quad-buffer stereoscopy support.

Source/Core/DolphinWX/VideoConfigDiag.cpp

@@ -622,8 +622,8 @@ VideoConfigDiag::VideoConfigDiag(wxWindow* parent, const std::string& title)
       szr_stereo->Add(new wxStaticText(page_enh, wxID_ANY, _("Stereoscopic 3D Mode:")), 0,
                       wxALIGN_CENTER_VERTICAL);
 
-      const wxString stereo_choices[] = {_("Off"), _("Side-by-Side"), _("Top-and-Bottom"),
-                                         _("Anaglyph"), _("Nvidia 3D Vision")};
+      const wxString stereo_choices[] = {_("Off"),      _("Side-by-Side"), _("Top-and-Bottom"),
+                                         _("Anaglyph"), _("Quad-Buffer"),  _("Nvidia 3D Vision")};
       wxChoice* stereo_choice =
           CreateChoice(page_enh, Config::GFX_STEREO_MODE, wxGetTranslation(stereo_3d_desc),
                        vconfig.backend_info.bSupports3DVision ? ArraySize(stereo_choices) :

Source/Core/VideoBackends/D3D/D3DBase.cpp

@@ -303,6 +303,7 @@ HRESULT Create(HWND wnd)
   swap_chain_desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
   swap_chain_desc.Width = xres;
   swap_chain_desc.Height = yres;
+  swap_chain_desc.Stereo = g_ActiveConfig.iStereoMode == STEREO_QUADBUFFER;
 
 #if defined(_DEBUG) || defined(DEBUGFAST)
   // Creating debug devices can sometimes fail if the user doesn't have the correct

Source/Core/VideoBackends/D3D/Render.cpp

@@ -1220,12 +1220,16 @@ void Renderer::BlitScreen(TargetRectangle src, TargetRectangle dst, D3DTexture2D
     D3D11_VIEWPORT vp = CD3D11_VIEWPORT((float)dst.left, (float)dst.top, (float)dst.GetWidth(),
                                         (float)dst.GetHeight());
     D3D::context->RSSetViewports(1, &vp);
-    D3D::drawShadedTexQuad(src_texture->GetSRV(), src.AsRECT(), src_width, src_height,
-                           (g_Config.iStereoMode == STEREO_ANAGLYPH) ?
-                               PixelShaderCache::GetAnaglyphProgram() :
-                               PixelShaderCache::GetColorCopyProgram(false),
+
+    ID3D11PixelShader* pixelShader = (g_Config.iStereoMode == STEREO_ANAGLYPH) ?
+                                         PixelShaderCache::GetAnaglyphProgram() :
+                                         PixelShaderCache::GetColorCopyProgram(false);
+    ID3D11GeometryShader* geomShader = (g_ActiveConfig.iStereoMode == STEREO_QUADBUFFER) ?
+                                           GeometryShaderCache::GetCopyGeometryShader() :
+                                           nullptr;
+    D3D::drawShadedTexQuad(src_texture->GetSRV(), src.AsRECT(), src_width, src_height, pixelShader,
                            VertexShaderCache::GetSimpleVertexShader(),
-                           VertexShaderCache::GetSimpleInputLayout(), nullptr, Gamma);
+                           VertexShaderCache::GetSimpleInputLayout(), geomShader, Gamma);
   }
 }
 

Source/Core/VideoCommon/VideoConfig.h

@@ -47,6 +47,7 @@ enum StereoMode
   STEREO_SBS,
   STEREO_TAB,
   STEREO_ANAGLYPH,
+  STEREO_QUADBUFFER,
   STEREO_3DVISION
 };