[dxgi] Reset pointers before returning an error

Also fixes a refcount issue and minor code formatting issues.

src/dxgi/dxgi_adapter.cpp

@@ -60,8 +60,10 @@ namespace dxvk {
     if (ppOutput == nullptr)
       return DXGI_ERROR_INVALID_CALL;
     
-    if (Output > 0)
+    if (Output > 0) {
+      *ppOutput = nullptr;
       return DXGI_ERROR_NOT_FOUND;
+    }
     
     // TODO support multiple monitors
     HMONITOR monitor = ::MonitorFromPoint({ 0, 0 }, MONITOR_DEFAULTTOPRIMARY);
@@ -72,7 +74,7 @@ namespace dxvk {
   
   HRESULT STDMETHODCALLTYPE DxgiAdapter::GetDesc(DXGI_ADAPTER_DESC* pDesc) {
     if (pDesc == nullptr)
-      return E_INVALIDARG;
+      return DXGI_ERROR_INVALID_CALL;
 
     DXGI_ADAPTER_DESC1 desc1;
     HRESULT hr = this->GetDesc1(&desc1);
@@ -176,16 +178,18 @@ namespace dxvk {
   HRESULT DxgiAdapter::GetOutputFromMonitor(
           HMONITOR              Monitor,
           IDXGIOutput**         ppOutput) {
-    Com<IDXGIOutput> output;
+    if (ppOutput == nullptr)
+      return DXGI_ERROR_INVALID_CALL;
     
-    for (uint32_t i = 0; SUCCEEDED(EnumOutputs(i, &output)); i++) {
+    for (uint32_t i = 0; SUCCEEDED(EnumOutputs(i, ppOutput)); i++) {
       DXGI_OUTPUT_DESC outputDesc;
-      output->GetDesc(&outputDesc);
+      (*ppOutput)->GetDesc(&outputDesc);
       
-      if (outputDesc.Monitor == Monitor) {
+      if (outputDesc.Monitor == Monitor)
-        *ppOutput = output.ref();
         return S_OK;
-      }
+      
+      (*ppOutput)->Release();
+      (*ppOutput) = nullptr;
     }
     
     // No such output found

src/dxgi/dxgi_device.cpp

@@ -51,6 +51,9 @@ namespace dxvk {
   
   HRESULT STDMETHODCALLTYPE DxgiDevice::GetAdapter(
           IDXGIAdapter**        pAdapter) {
+    if (pAdapter == nullptr)
+      return DXGI_ERROR_INVALID_CALL;
+    
     *pAdapter = static_cast<IDXGIAdapter*>(m_adapter.ref());
     return S_OK;
   }

src/dxgi/dxgi_factory.cpp

@@ -41,6 +41,10 @@ namespace dxvk {
   HRESULT STDMETHODCALLTYPE DxgiFactory::CreateSoftwareAdapter(
           HMODULE         Module,
           IDXGIAdapter**  ppAdapter) {
+    if (ppAdapter == nullptr)
+      return DXGI_ERROR_INVALID_CALL;
+    
+    *ppAdapter = nullptr;
     Logger::err("DxgiFactory::CreateSoftwareAdapter: Software adapters not supported");
     return DXGI_ERROR_UNSUPPORTED;
   }
@@ -52,6 +56,7 @@ namespace dxvk {
           IDXGISwapChain**      ppSwapChain) {
     if (ppSwapChain == nullptr || pDesc == nullptr || pDevice == NULL)
       return DXGI_ERROR_INVALID_CALL;
+    
     if (pDesc->OutputWindow == nullptr)
       return DXGI_ERROR_INVALID_CALL;
     
@@ -73,8 +78,7 @@ namespace dxvk {
     
     IDXGIAdapter1* handle = nullptr;
     HRESULT hr = this->EnumAdapters1(Adapter, &handle);
-    if (SUCCEEDED(hr))
+    *ppAdapter = handle;
-      *ppAdapter = handle;
     return hr;
   }
   
@@ -85,8 +89,10 @@ namespace dxvk {
     if (ppAdapter == nullptr)
       return DXGI_ERROR_INVALID_CALL;
     
-    if (Adapter >= m_adapters.size())
+    if (Adapter >= m_adapters.size()) {
+      *ppAdapter = nullptr;
       return DXGI_ERROR_NOT_FOUND;
+    }
     
     *ppAdapter = ref(new DxgiAdapter(
       this, m_adapters.at(Adapter)));

src/dxgi/dxgi_output.cpp

@@ -36,9 +36,7 @@ namespace dxvk {
   }
   
   
-  HRESULT STDMETHODCALLTYPE DxgiOutput::GetParent(
+  HRESULT STDMETHODCALLTYPE DxgiOutput::GetParent(REFIID riid, void **ppParent) {
-          REFIID riid,
-          void   **ppParent) {
     return m_adapter->QueryInterface(riid, ppParent);
   }
   

src/dxgi/dxgi_swapchain.cpp

@@ -141,6 +141,7 @@ namespace dxvk {
     
     if (ppTarget != nullptr) {
       *ppTarget = nullptr;
+      
       if (!m_desc.Windowed)
         hr = this->GetContainingOutput(ppTarget);
     }