GSdx-Capture: Grayout configure button for codecs

The following patch grays out the configure button when there's no
configuration dialog available for the selected codec. What's the use in
clicking it when no dialog pops up? :P (I've been tricked by it lots of
times)

plugins/GSdx/GSCaptureDlg.cpp

@@ -54,6 +54,30 @@ int GSCaptureDlg::GetSelCodec(Codec& c)
 	return 0;
 }
 
+void GSCaptureDlg::UpdateConfigureButton()
+{
+	Codec c;
+	bool enable = false;
+
+	if (GetSelCodec(c) != 1)
+	{
+		EnableWindow(GetDlgItem(m_hWnd, IDC_CONFIGURE), false);
+		return;
+	}
+
+	if (CComQIPtr<ISpecifyPropertyPages> pSPP = c.filter)
+	{
+		CAUUID caGUID;
+		memset(&caGUID, 0, sizeof(caGUID));
+		enable = SUCCEEDED(pSPP->GetPages(&caGUID));
+	}
+	else if (CComQIPtr<IAMVfwCompressDialogs> pAMVfWCD = c.filter)
+	{
+		enable = pAMVfWCD->ShowDialog(VfwCompressDialog_QueryConfig, nullptr) == S_OK;
+	}
+	EnableWindow(GetDlgItem(m_hWnd, IDC_CONFIGURE), enable);
+}
+
 void GSCaptureDlg::OnInit()
 {
 	__super::OnInit();
@@ -112,6 +136,7 @@ void GSCaptureDlg::OnInit()
 		ComboBoxAppend(IDC_CODECS, s.c_str(), (LPARAM)&m_codecs.back(), c.DisplayName == selected);
 	}
 	EndEnumSysDev
+	UpdateConfigureButton();
 }
 
 bool GSCaptureDlg::OnCommand(HWND hWnd, UINT id, UINT code)
@@ -180,6 +205,7 @@ bool GSCaptureDlg::OnCommand(HWND hWnd, UINT id, UINT code)
 	}
 	case IDC_CODECS:
 	{
+		UpdateConfigureButton();
 		break;
 	}
 	case IDOK:

plugins/GSdx/GSCaptureDlg.h

@@ -38,6 +38,7 @@ class GSCaptureDlg : public GSDialog
 	std::list<Codec> m_codecs;
 
 	int GetSelCodec(Codec& c);
+	void UpdateConfigureButton();
 
 protected:
 	void OnInit();