[dxgi,d3d9] Use global singleton for DXVK instances

No reason to have multiple of these around, and instance creation
is fairly expensive.

src/d3d9/d3d9_interface.cpp

@@ -4,12 +4,16 @@
 #include "d3d9_caps.h"
 #include "d3d9_device.h"
 
+#include "../util/util_singleton.h"
+
 #include <algorithm>
 
 namespace dxvk {
 
+  Singleton<DxvkInstance> g_dxvkInstance;
+
   D3D9InterfaceEx::D3D9InterfaceEx(bool bExtended)
-    : m_instance    ( new DxvkInstance() )
+    : m_instance    ( g_dxvkInstance.acquire() )
     , m_extended    ( bExtended ) 
     , m_d3d9Options ( nullptr, m_instance->config() )
     , m_d3d9Interop ( this ) {
@@ -64,6 +68,11 @@ namespace dxvk {
   }
 
 
+  D3D9InterfaceEx::~D3D9InterfaceEx() {
+    g_dxvkInstance.release();
+  }
+
+
   HRESULT STDMETHODCALLTYPE D3D9InterfaceEx::QueryInterface(REFIID riid, void** ppvObject) {
     if (ppvObject == nullptr)
       return E_POINTER;

src/d3d9/d3d9_interface.h

@@ -20,6 +20,8 @@ namespace dxvk {
 
     D3D9InterfaceEx(bool bExtended);
 
+    ~D3D9InterfaceEx();
+
     HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void** ppvObject);
 
     HRESULT STDMETHODCALLTYPE RegisterSoftwareDevice(void* pInitializeFunction);

src/dxgi/dxgi_factory.cpp

@@ -3,8 +3,12 @@
 #include "dxgi_swapchain.h"
 #include "dxgi_swapchain_dispatcher.h"
 
+#include "../util/util_singleton.h"
+
 namespace dxvk {
 
+  Singleton<DxvkInstance> g_dxvkInstance;
+
   DxgiVkFactory::DxgiVkFactory(DxgiFactory* pFactory)
   : m_factory(pFactory) {
 
@@ -44,7 +48,7 @@ namespace dxvk {
 
 
   DxgiFactory::DxgiFactory(UINT Flags)
-  : m_instance    (new DxvkInstance()),
+  : m_instance    (g_dxvkInstance.acquire()),
     m_interop     (this),
     m_options     (m_instance->config()),
     m_monitorInfo (this, m_options),
@@ -55,7 +59,7 @@ namespace dxvk {
   
   
   DxgiFactory::~DxgiFactory() {
-    
+    g_dxvkInstance.release();
   }